CHST (Construction Health and Safety Technician) Exam — Questions and Answers

Question 1: What OSHA standard requires a written Chemical Hygiene Plan in laboratories that use hazardous chemicals?

29 CFR 1910.119
29 CFR 1926.59
29 CFR 1910.1200
29 CFR 1910.1450 (Correct answer)

Correct answer: 29 CFR 1910.1450

OSHA's Laboratory Safety Standard (29 CFR 1910.1450) requires a written Chemical Hygiene Plan for laboratories using hazardous chemicals.

Question 2: Under OSHA 1926.651(c)(2), at what trench depth must a stairway, ladder, ramp, or other safe means of egress be provided?

5 feet or more in depth
8 feet or more in depth
6 feet or more in depth
4 feet or more in depth (Correct answer)

Correct answer: 4 feet or more in depth

OSHA 1926.651(c)(2) requires adequate means of egress in trench excavations 4 feet or more in depth, with the egress point no more than 25 feet of lateral travel from any worker.

Question 3: What specific hazard does OSHA address in 29 CFR 1926.702 regarding bulk cement storage silos?

Electrical grounding of metallic silos
Silica dust exposure during silo loading
Noise exposure from pneumatic cement conveyors
Engulfment hazard from entering an in-service silo (Correct answer)

Correct answer: Engulfment hazard from entering an in-service silo

OSHA 1926.702(j) prohibits workers from entering bulk cement storage bins, tanks, or silos that are in service due to the engulfment hazard from flowing cement, which can bury a worker in seconds. This is analogous to grain entrapment in agriculture and is specifically addressed in the concrete subpart.

Question 4: Under OSHA 1926.502(b), what is required between the top rail and the walking surface of a guardrail system when there is no wall or parapet wall at least 21 inches high?

A second top rail at 21 inches
A toeboard is the only additional requirement
Safety netting below the top rail only
A midrail, screen, mesh, or other intermediate member installed midway between the top rail and the walking surface (Correct answer)

Correct answer: A midrail, screen, mesh, or other intermediate member installed midway between the top rail and the walking surface

OSHA 1926.502(b)(2) requires that a midrail, screen, mesh, or other intermediate member be installed approximately midway between the top rail and the walking/working surface when there is no wall or parapet at least 21 inches high.

Question 5: What does a crane's 'derating' mean in the context of crane operations?

Lowering the boom speed during a pick
Increasing the counterweight to allow heavier lifts
Reducing the rated capacity due to configuration, attachment, or site conditions (Correct answer)
Removing the anti-two-block device for special lifts

Correct answer: Reducing the rated capacity due to configuration, attachment, or site conditions

Derating means the crane's capacity is officially reduced below the manufacturer's chart value to account for conditions such as soft ground, outrigger restrictions, or non-standard configuration.

Question 6: During confined-space entry on a construction site, the atmosphere tests at 19.0% oxygen. How should this be classified?

Oxygen-enriched — fire risk is the primary concern
Normal — no action required since it is close to 20.9%
Oxygen-deficient — entry requires supplied-air or SCBA (Correct answer)
Slightly low — a half-face APR with OV cartridge is sufficient

Correct answer: Oxygen-deficient — entry requires supplied-air or SCBA

OSHA defines an oxygen-deficient atmosphere as less than 19.5% O₂; at 19.0% the space requires supplied-air or SCBA for entry.

Question 7: The OSHA 300A Annual Summary must be posted during which period and signed by whom?

Submitted to OSHA by January 31 and posted for 30 days after submission
Posted January 1 through March 31 and signed by the safety director
Posted February 1 through April 30 of the year following the recording year; signed and certified by a company executive (owner, officer, or highest-ranking official) (Correct answer)
Posted year-round and signed by any supervisor

Correct answer: Posted February 1 through April 30 of the year following the recording year; signed and certified by a company executive (owner, officer, or highest-ranking official)

The OSHA 300A Annual Summary must be posted from February 1 to April 30 of the year following the recording year, and must be certified by a company executive — not just a safety officer or supervisor.

Question 8: A construction worker experiences sudden loss of sensation in fingers after extended use of a jackhammer. This condition is MOST likely:

Carpal tunnel syndrome
Thoracic outlet syndrome
Hand-arm vibration syndrome (HAVS) (Correct answer)
Raynaud's disease

Correct answer: Hand-arm vibration syndrome (HAVS)

Hand-arm vibration syndrome (HAVS) results from prolonged use of vibrating tools and causes vascular and neurological damage to fingers and hands.

Question 9: According to OSHA 29 CFR 1926 Subpart M, what is the minimum height at which fall protection is required for construction workers on a walking/working surface with an unprotected side or edge?

5 feet
10 feet
6 feet (Correct answer)
4 feet

Correct answer: 6 feet

OSHA's standard for fall protection in construction, 29 CFR 1926.501(b)(1), mandates that each employee on a walking/working surface with an unprotected side or edge which is 6 feet or more above a lower level shall be protected from falling by the use of guardrail systems, safety net systems, or personal fall arrest systems.

Question 10: What is the primary purpose of a pre-task planning (PTP) meeting before beginning a new phase of work?

To review the project budget and materials needed
To identify task-specific hazards and agree on controls before work begins (Correct answer)
To assign overtime pay and schedule breaks
To satisfy union contract requirements for daily meetings

Correct answer: To identify task-specific hazards and agree on controls before work begins

Pre-task planning brings workers and supervisors together before starting work to identify hazards specific to that task and establish agreed-upon controls.

Question 11: Which of the following best describes the 'Fatal Four'—the leading causes of construction fatalities identified by OSHA?

Falls, electrocution, struck-by, caught-in/between (Correct answer)
Falls, caught-in/between, chemical burns, fires
Electrocution, drowning, struck-by, heat illness
Falls, fires, chemical exposure, struck-by

Correct answer: Falls, electrocution, struck-by, caught-in/between

OSHA identifies the Fatal Four as falls, electrocution, struck-by objects, and caught-in/between hazards, which together account for more than 60% of construction worker deaths.

Question 12: In order to achieve a safe lift, which of the following does a mobile crane operator NOT need to be aware of?

Whether the outriggers are extended or retracted
Whether the tires are fully inflated
The angle of the boom
The width of the jib (Correct answer)

Correct answer: The width of the jib

A crane operator must be informed of the crane's capabilities and limitations in order to ensure a safe lift. Outriggers should always be used, and they should be placed on solid, level ground. How much of the crane's maximum rated load it can lift without tipping over will depend on the boom's angle. Finally, to lessen the chance of tipping, the tires must be fully filled.

Question 13: Hand-arm vibration syndrome (HAVS) is most associated with prolonged use of which type of construction tool?

Electric conduit benders
Chipping hammers and grinders (Correct answer)
Powder-actuated nail guns
Hydraulic man-lifts

Correct answer: Chipping hammers and grinders

HAVS (also called vibration white finger) results from chronic exposure to hand-transmitted vibration typically above 2.5 m/s² A(8). Chipping hammers, grinders, jackhammers, and similar vibratory hand tools are the primary sources in construction. Powder-actuated tools fire too briefly; lifts and benders transmit minimal hand-arm vibration.

Question 14: Which of the following best describes the 'action level' for noise under OSHA's Hearing Conservation Amendment (29 CFR 1910.95)?

100 dBA peak sound pressure
90 dBA as an 8-hour TWA
80 dBA as an 8-hour TWA
85 dBA as an 8-hour TWA (Correct answer)

Correct answer: 85 dBA as an 8-hour TWA

The OSHA action level for noise is 85 dBA as an 8-hour TWA, which triggers audiometric testing and hearing conservation program requirements.

Question 15: According to OSHA confined space standards, which of the following is NOT a required element of a permit-required confined space entry permit?

Workers' compensation insurance policy number (Correct answer)
Name and signature of the entry supervisor
Equipment to be used by entrants
Identity of the space and date of entry

Correct answer: Workers' compensation insurance policy number

Entry permits must include space identification, date, authorized entrants, attendants, supervisors, hazards, controls, equipment, and communications—not insurance information.

Question 16: Which element of the incident causation model represents conditions that allow or fail to prevent an unsafe act?

Contributing cause
Precondition or enabling factor (Correct answer)
Immediate cause
Systemic root cause

Correct answer: Precondition or enabling factor

Preconditions or enabling factors (sometimes called indirect causes) are environmental, organizational, or individual conditions that set the stage for unsafe acts to occur.

Question 17: Under OSHA 1926.150(c), what minimum extinguisher rating is required for Class A (ordinary combustible) fire hazards on construction sites?

10-B:C
2-A (Correct answer)
4-A
1-A

Correct answer: 2-A

OSHA 1926.150(c)(1)(ii) requires a minimum 2-A rated extinguisher for ordinary combustible (Class A) fire hazards on construction sites — the '2-A' rating represents an extinguishing capacity equivalent to 2.5 gallons of water.

Question 18: The CHST exam is administered by which certifying organization?

National Safety Council (NSC)
Board of Certified Safety Professionals (BCSP) (Correct answer)
OSHA Training Institute
American Society of Safety Professionals (ASSP)

Correct answer: Board of Certified Safety Professionals (BCSP)

The CHST credential is awarded and administered by the Board of Certified Safety Professionals (BCSP).

Question 19: Which of the following DOES NOT, in general, meet NIOSH's definition of a hazard control strategy for preventing work-related injuries?

Personal protective equipment
Adherence to the Fair Labor Standards Act (FLSA) (Correct answer)
Engineering controls
Administrative controls

Correct answer: Adherence to the Fair Labor Standards Act (FLSA)

The hierarchy of controls, which recommends using engineering controls, administrative controls, and personal protective equipment in the workplace in that order to prevent work-related injuries, is encouraged by NIOSH.

Question 20: What is a 'trench shield' (trench box), and what is its primary limitation compared to hydraulic shoring?

A sloped excavation reinforced with sheet piling
A structure that protects workers from cave-in material but does NOT prevent the trench wall from collapsing (Correct answer)
A timber cribbing system that prevents soil movement
A hydraulic system that actively pushes against trench walls to prevent movement

Correct answer: A structure that protects workers from cave-in material but does NOT prevent the trench wall from collapsing

A trench shield (trench box) protects workers by shielding them from falling cave-in material. Unlike hydraulic shoring, it does not apply pressure to the trench walls and does not prevent the trench wall from collapsing outside the box.

Question 21: A safety technician is tasked with improving the company's incident investigation process. Which change would have the GREATEST impact on preventing future incidents?

Requiring all investigations to be reviewed by legal counsel
Identifying root causes rather than only immediate causes (Correct answer)
Completing investigation reports within 24 hours
Increasing the number of photographs taken at incident scenes

Correct answer: Identifying root causes rather than only immediate causes

Root cause analysis addresses the systemic failures that allow incidents to occur, leading to corrective actions that prevent recurrence rather than just treating symptoms.

Question 22: Which of the following best describes the purpose of a Job Safety Analysis (JSA) in construction safety management?

To identify, analyze, and control hazards associated with specific job steps before work begins (Correct answer)
To document injuries after they occur for OSHA recordkeeping
To measure a worker's compliance with PPE requirements
To fulfill OSHA's required written program for confined spaces

Correct answer: To identify, analyze, and control hazards associated with specific job steps before work begins

A JSA proactively breaks a job into steps, identifies hazards associated with each step, and establishes controls before work begins.

Question 23: What is the primary purpose of a fire watch during hot work operations?

To document the work being performed
To verify the welder's credentials
To monitor for ignition of fires during and after hot work (Correct answer)
To ensure ventilation equipment is functioning

Correct answer: To monitor for ignition of fires during and after hot work

A fire watch is maintained during and for at least 30 minutes after hot work to detect and extinguish any fires that may ignite from sparks or heat.

Question 24: Under OSHA 1926.24, what must a construction site fire prevention plan include?

Only the location of fire extinguishers on the site
A building floor plan showing exit locations only
Emergency contact numbers and insurance information
List of major fire hazards, procedures for handling and storing flammable materials, ignition source controls, fire protection equipment, and assigned responsibilities for maintaining equipment and controlling hazards (Correct answer)

Correct answer: List of major fire hazards, procedures for handling and storing flammable materials, ignition source controls, fire protection equipment, and assigned responsibilities for maintaining equipment and controlling hazards

OSHA 1926.24 requires a written fire prevention plan that addresses fire hazards, ignition source control, flammable material storage, fire protection equipment, and responsibilities for plan maintenance.

Question 25: Which administrative control is most effective for reducing cumulative trauma disorders among workers performing repetitive tasks?

Scheduling quarterly ergonomic assessments
Requiring anti-vibration gloves at all times
Posting MSD hazard warning signs near workstations
Implementing job rotation so no single muscle group is overloaded continuously (Correct answer)

Correct answer: Implementing job rotation so no single muscle group is overloaded continuously

Job rotation distributes repetitive loading across different muscle groups, allowing recovery time and reducing cumulative exposure for any single tissue. Anti-vibration gloves (PPE) have limited effectiveness and don't reduce posture or force demands. Signs and periodic assessments are informational — they don't reduce the physical stress directly.

Question 26: What is the OSHA permissible exposure limit (PEL) for silica (respirable crystalline) in construction under 29 CFR 1926.1153?

25 µg/m³ as an 8-hour TWA
250 µg/m³ as an 8-hour TWA
50 µg/m³ as an 8-hour TWA (Correct answer)
100 µg/m³ as an 8-hour TWA

Correct answer: 50 µg/m³ as an 8-hour TWA

OSHA's PEL for respirable crystalline silica in construction is 50 µg/m³ as an 8-hour time-weighted average.

Question 27: During an incident investigation on a construction site, what is the PRIMARY purpose of conducting witness interviews as soon as possible after the event?

To assign blame to responsible workers
To capture accurate recollections before memory fades (Correct answer)
To prepare for potential litigation
To satisfy insurance company requirements

Correct answer: To capture accurate recollections before memory fades

Witness interviews should be conducted promptly because human memory deteriorates rapidly, and early interviews yield the most accurate and detailed accounts of what occurred.

Question 28: Per OSHA 1926 Subpart K, which of the following is an acceptable method to protect employees from electrical hazards in wet locations on a construction site?

Wearing leather gloves
Providing GFCI protection on all 120-volt, 15- and 20-ampere circuits (Correct answer)
Posting warning signs near puddles
Using double-insulated tools without any additional protection

Correct answer: Providing GFCI protection on all 120-volt, 15- and 20-ampere circuits

OSHA requires GFCI protection for 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites, which is especially critical in wet conditions.

Question 29: When is a registered professional engineer (PE) required to design a protective system for an excavation?

Tabulated data or manufacturer data is not available for the site conditions (Correct answer)
When more than 5 workers are in the trench
Any excavation deeper than 4 feet
Any trench in Type B soil

Correct answer: Tabulated data or manufacturer data is not available for the site conditions

A PE-designed system is required when site conditions fall outside the scope of OSHA Appendix tables or manufacturer-supplied tabulated data under 29 CFR 1926.652(b)(4).

Question 30: A construction worker needs to work inside an electrical panel. After de-energizing and locking out, which test confirms zero energy state?

Visual inspection of the breaker position
Checking that indicator lights are off
Asking the electrician-in-charge if power is off
Testing with an appropriate voltage-rated meter or tester on all conductors (Correct answer)

Correct answer: Testing with an appropriate voltage-rated meter or tester on all conductors

OSHA requires verification of zero energy state by testing with appropriate test equipment rated for the voltage on all conductors before work begins.

Question 31: Under OSHA 29 CFR 1926.703, who must design formwork shoring systems that support cast-in-place concrete?

The concrete subcontractor's foreman
Any OSHA 30-hour certified worker
The project superintendent
A qualified person such as a licensed engineer (Correct answer)

Correct answer: A qualified person such as a licensed engineer

OSHA 1926.703(a)(1) requires formwork shoring to be designed by a qualified person — in practice a licensed engineer — who accounts for construction loads, lateral pressures from fresh concrete, and dynamic effects. A foreman or 30-hour card holder does not meet this design standard.

Question 32: Under OSHA's recordkeeping requirements, which of the following construction injuries must be recorded on the OSHA 300 log?

A minor first-aid-only cut treated with a bandage
A headache that resolves without treatment
A bee sting with no allergic reaction
A work-related fracture requiring no days away from work (Correct answer)

Correct answer: A work-related fracture requiring no days away from work

All work-related fractures are OSHA-recordable injuries regardless of whether they result in days away from work or restricted duty.

Question 33: What must a rigger do if the weight of a load is unknown before a lift?

Reduce rated capacity by 50% as a safety margin
Use the largest available sling
Determine the load weight before the lift proceeds (Correct answer)
Estimate based on visual size and proceed cautiously

Correct answer: Determine the load weight before the lift proceeds

OSHA 29 CFR 1926.1412 prohibits lifting loads of unknown weight; the actual weight must be determined before any lift begins.

Question 34: What action must be taken before working on or near a crane's electrical systems?

Apply lockout/tagout procedures (Correct answer)
Notify the site supervisor
Lower the boom to the ground
Post a spotter at the crane base

Correct answer: Apply lockout/tagout procedures

OSHA's lockout/tagout standard (29 CFR 1910.147) requires energy isolation and lockout before any maintenance on electrically powered crane systems.

Question 35: Under the Hazard Communication Standard, what must an employer's training program for employees exposed to hazardous chemicals include?

The home phone numbers of the chemical manufacturer's safety representatives.
The methods to detect the presence of a hazardous chemical and the physical and health hazards involved. (Correct answer)
Instructions on how to independently re-classify chemical mixtures.
A copy of the purchase order for every hazardous chemical on site.

Correct answer: The methods to detect the presence of a hazardous chemical and the physical and health hazards involved.

OSHA's Hazard Communication Standard (29 CFR 1910.1200) requires that employee training includes methods to detect the presence or release of hazardous chemicals, the physical and health hazards of those chemicals, and the measures employees can take to protect themselves, including understanding labels and Safety Data Sheets (SDSs).

Question 36: Under 29 CFR 1926.503, employers must verify that each worker who works at heights has been trained by providing which documentation?

A signed fall protection plan submitted to OSHA before work begins
Proof of completion of an OSHA 10-hour construction card
A written certification record with the employee's name, training date, and trainer's name (Correct answer)
A copy of the worker's prior employer's fall protection training record

Correct answer: A written certification record with the employee's name, training date, and trainer's name

29 CFR 1926.503(b) specifically requires a written certification record documenting employee name, training date, and certifying trainer identity.

Question 37: Which of the following BEST describes 'safety climate' as it relates to training effectiveness?

The outdoor temperature conditions under which safety training should be conducted
The number of safety posters displayed in common areas
The frequency of OSHA inspections at a given site
Workers' shared perceptions of how much management genuinely values safety (Correct answer)

Correct answer: Workers' shared perceptions of how much management genuinely values safety

Safety climate reflects workforce perceptions of management commitment; a positive climate amplifies training effectiveness while a negative one undermines it.

Question 38: According to OSHA HazCom 2012, signal words used on labels are limited to:

Notice, Caution, and Warning
Danger, Warning, and Caution
Caution and Warning
Warning and Danger (Correct answer)

Correct answer: Warning and Danger

GHS-aligned HazCom 2012 uses only two signal words: 'Danger' for more severe hazards and 'Warning' for less severe hazards.

Question 39: Which incident investigation technique involves repeatedly asking 'why' until the fundamental system failure is identified?

Change analysis
Barrier analysis
5-Whys analysis (Correct answer)
Failure mode and effects analysis

Correct answer: 5-Whys analysis

The 5-Whys technique iteratively asks 'why' at each level of cause until the root systemic failure is uncovered.

Question 40: When two cranes perform a tandem (multi-crane) lift, which statement is correct?

Each crane may be loaded up to 100% of its individual rated capacity
The lighter crane sets the lift limit for the entire operation
The combined rated capacity equals the sum of both cranes' maximum capacities
A qualified lift director must be designated and each crane's load share must be calculated (Correct answer)

Correct answer: A qualified lift director must be designated and each crane's load share must be calculated

OSHA 1926.1436 requires a qualified lift director for multi-crane operations, and load distribution calculations must be completed to ensure neither crane is overloaded.

Question 41: How long must an employer retain records regarding a chemical to which an employee was exposed and for which they received medical care?

Until the chemical is no longer used by the company
Thirty (30) years (Correct answer)
Ten (10) years
Three (3) years

Correct answer: Thirty (30) years

Employers are required to retain Safety Data Sheets (SDSs) for any chemicals used in their work under the Hazard Communication Standard (29 CFR 1910.1200, as referenced in 29 CFR 1926.59). However, if a worker is exposed to a chemical and receives medical attention, the employer is still required to preserve records about that chemical for thirty (30) years beyond the date of the employee's exposure since some consequences of chemical exposure are latent, meaning they do not manifest themselves until after some amount of time has elapsed. The SDS is optional for employers to keep, but they are required by law to at the very least preserve a record of the chemical to show where and when it was used.

Question 42: Under OSHA regulations, what must be done when a construction worker does not speak English and falls under a safety training requirement?

Posting bilingual safety signs satisfies the training requirement
Training must be provided in the worker's primary language or through a qualified interpreter — training in English only does not satisfy OSHA's requirement if the worker cannot understand it (Correct answer)
Workers must demonstrate English proficiency before working on the site
The general contractor's safety officer is solely responsible, not the foreman

Correct answer: Training must be provided in the worker's primary language or through a qualified interpreter — training in English only does not satisfy OSHA's requirement if the worker cannot understand it

OSHA requires that training be provided in a form workers can understand. If a worker does not speak English, the employer must provide training in the worker's primary language or through a qualified interpreter.

Question 43: Who has the authority and responsibility to cancel a confined space entry permit if conditions become unsafe?

The entry supervisor (Correct answer)
The authorized entrant
The attendant
The company safety director

Correct answer: The entry supervisor

The entry supervisor has the authority and responsibility to cancel the entry permit if conditions change or a hazard develops that makes the space unsafe for entry.

Question 44: Which GHS pictogram indicates an acute toxicity hazard?

Exclamation mark
Skull and crossbones (Correct answer)
Health hazard (silhouette with asterisk)
Flame symbol

Correct answer: Skull and crossbones

The skull and crossbones GHS pictogram indicates acute toxicity (fatal or toxic if ingested, inhaled, or in contact with skin).

Question 45: Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections does a Safety Data Sheet (SDS) contain?

16 (Correct answer)
8
20
12

Correct answer: 16

OSHA's HazCom 2012, aligned with the GHS, requires SDSs to have exactly 16 standardized sections.

Question 46: Which document establishes the minimum safety and health requirements for a permit-required confined space entry program?

OSHA 29 CFR 1926.21
NFPA 101
ANSI Z87.1
OSHA 29 CFR 1910.146 (Correct answer)

Correct answer: OSHA 29 CFR 1910.146

OSHA 29 CFR 1910.146 covers permit-required confined spaces and is applied to construction via 1926.21 reference.

Question 47: When creating training materials for low-literacy construction workers, which instructional design strategy is MOST effective?

Administer a reading comprehension test before any safety training is delivered
Provide dense written manuals and require workers to read them independently
Conduct all training via online modules with lengthy text passages
Use images, demonstrations, and hands-on practice with minimal reliance on written text (Correct answer)

Correct answer: Use images, demonstrations, and hands-on practice with minimal reliance on written text

Visual and hands-on methods bypass literacy barriers and align with how adults with limited reading skills best acquire and retain safety information.

Question 48: For voltages up to _ kV, cranes and derricks must be at least _ feet away from power lines.

20; 350 (Correct answer)
10; 225
20; 225
10; 350

Correct answer: 20; 350

According to 29 CFR 1926.1408 cranes, derricks, and other tall equipment or structures must be at least 20 feet away from power lines at voltages up to 350 kV. Higher voltages necessitate longer distances.

Question 49: Which type of personal protective equipment is classified as 'Level B' in the EPA's hazardous materials protection framework, and when is it most appropriate for construction workers?

Fully encapsulating vapor-tight suit with SCBA, used when the highest level of skin and respiratory protection is required
Self-contained breathing apparatus (SCBA) with non-encapsulating chemical-resistant suit, used when the highest respiratory protection is needed but skin and eye exposure is unlikely (Correct answer)
Air-purifying respirator with chemical-resistant suit, used when the specific airborne contaminant is known
Powered air-purifying respirator (PAPR) with splash-resistant coveralls, used for low-level chemical exposure

Correct answer: Self-contained breathing apparatus (SCBA) with non-encapsulating chemical-resistant suit, used when the highest respiratory protection is needed but skin and eye exposure is unlikely

EPA Level B protection combines an SCBA for the highest level of respiratory protection with a non-encapsulating chemical-resistant suit. It is appropriate when the chemical has a high inhalation hazard but the vapor concentration or skin absorption potential does not require a fully encapsulating (Level A) suit.

Question 50: Under OSHA 1904.39, within what timeframe must employers report an in-patient hospitalization, amputation, or loss of an eye to OSHA?

Within 72 hours
Within 8 hours
Within 3 business days
Within 24 hours of learning about the event (Correct answer)

Correct answer: Within 24 hours of learning about the event

OSHA 1904.39(a)(2) requires employers to report in-patient hospitalizations, amputations, and loss of an eye to OSHA within 24 hours of learning about the incident — distinct from the 8-hour requirement for fatalities.

Question 51: Which leading indicator is most useful for predicting future injury rates in a construction safety program?

Total workers' compensation costs year-to-date
Number of recordable injuries last quarter
Number of OSHA citations received
Percentage of safety observations completed on schedule (Correct answer)

Correct answer: Percentage of safety observations completed on schedule

Leading indicators like safety observation completion rates measure proactive safety activities before incidents occur, unlike lagging indicators such as injury counts.

Question 52: What is the minimum illumination level OSHA requires for general construction areas, warehouses, and corridors?

10 foot-candles
5 foot-candles (Correct answer)
3 foot-candles
30 foot-candles

Correct answer: 5 foot-candles

OSHA 29 CFR 1926.56 requires a minimum of 5 foot-candles of illumination in general construction areas, warehouses, corridors, exits, and other areas.

Question 53: What does the term 'competent person' mean under OSHA construction standards?

A licensed professional engineer only
A person designated by the employer who can identify hazards and has authority to take corrective action (Correct answer)
A third-party safety consultant hired for the project
Any worker with at least five years of experience

Correct answer: A person designated by the employer who can identify hazards and has authority to take corrective action

OSHA defines a competent person as someone capable of identifying existing and predictable hazards and authorized to take prompt corrective measures.

Question 54: Ground Fault Circuit Interrupters (GFCIs) are required by OSHA on construction sites. How quickly does a GFCI interrupt a circuit when a fault is detected?

Within 100 milliseconds
Within 1 second
Within 1/40th of a second (approximately 25 milliseconds) (Correct answer)
Within 5 seconds

Correct answer: Within 1/40th of a second (approximately 25 milliseconds)

GFCIs are designed to trip within 1/40th of a second (approximately 25 milliseconds) when they detect a ground fault of 5 milliamps or more, fast enough to prevent electrocution.

Question 55: According to OSHA standards, what is the permissible noise exposure limit for an 8-hour time-weighted average?

80 dBA
85 dBA
95 dBA
90 dBA (Correct answer)

Correct answer: 90 dBA

OSHA's permissible exposure limit (PEL) for noise is 90 dBA as an 8-hour TWA under 29 CFR 1926.52, though a hearing conservation program is triggered at 85 dBA.

Question 56: Which OSHA standard specifically governs fall protection requirements in construction?

29 CFR 1926.502 (Correct answer)
29 CFR 1926.452
29 CFR 1910.132
29 CFR 1910.147

Correct answer: 29 CFR 1926.502

29 CFR 1926.502 sets the criteria and practices for fall protection systems including guardrails, safety nets, and personal fall arrest systems in construction.

Question 57: What is the primary purpose of a Safety Data Sheet (SDS) Section 8 ('Exposure Controls/Personal Protection')?

To specify OELs and recommended PPE for safe handling (Correct answer)
To detail spill and disposal procedures
To list the chemical's physical and chemical properties
To describe first aid measures for exposure

Correct answer: To specify OELs and recommended PPE for safe handling

SDS Section 8 provides occupational exposure limits (OELs), engineering controls, and PPE recommendations to protect workers handling the chemical.

Question 58: OSHA requires employers to orally report a fatality to the nearest OSHA office within:

24 hours
8 hours (Correct answer)
48 hours
72 hours

Correct answer: 8 hours

Under 29 CFR 1904.39, employers must report any work-related fatality to OSHA within 8 hours of learning about it.

Question 59: What does the term 'competent person' mean under OSHA construction standards?

A licensed professional engineer
A person who has completed OSHA 30-hour training
Any person with a college degree in safety
A person designated by the employer who can identify hazards and has authority to take corrective action (Correct answer)

Correct answer: A person designated by the employer who can identify hazards and has authority to take corrective action

OSHA defines a competent person as one capable of identifying existing and predictable hazards and authorized to take prompt corrective measures.

Question 60: What does the term 'qualified person' mean in the context of OSHA's electrical safety standards?

A licensed electrician with at least 5 years of experience
A person trained and knowledgeable in electrical hazards and authorized to work on or near energized equipment (Correct answer)
An employee certified by a third-party electrical safety organization
Any employee who has completed a 10-hour OSHA construction safety course

Correct answer: A person trained and knowledgeable in electrical hazards and authorized to work on or near energized equipment

OSHA defines a qualified person as one who has received training on electrical hazards and the skills to distinguish exposed live parts and determine their nominal voltage.

Question 61: What is the purpose of a 'toolbox talk' (tailgate meeting) in construction safety management?

To review OSHA citations with workers
To formally document all workplace injuries
To conduct formal hazard assessments requiring signatures
To provide brief, focused safety training before work begins (Correct answer)

Correct answer: To provide brief, focused safety training before work begins

Toolbox talks are short, informal safety meetings held at the worksite to address specific hazards relevant to the day's tasks and reinforce safe work practices.

Question 62: In the hierarchy of controls, where does personal protective equipment (PPE) rank, and why?

PPE is the highest-order control because it is the most reliable protection method
PPE ranks third, between administrative controls and engineering controls
PPE ranks second, just below engineering controls
PPE is the lowest-order (last resort) control because it protects workers from exposure but does not eliminate or reduce the hazard itself (Correct answer)

Correct answer: PPE is the lowest-order (last resort) control because it protects workers from exposure but does not eliminate or reduce the hazard itself

PPE is the lowest-order control in the hierarchy (elimination, substitution, engineering, administrative, PPE) because it does nothing to reduce the hazard — it only protects the worker from it, and relies on correct use every time.

Question 63: Which document should be used to record that individual workers received and understood OSHA-required safety training?

A signed training attendance record or roster with the date, topic, and trainer's name (Correct answer)
The company's general safety plan without individual names
A verbal confirmation logged only in the supervisor's memory
An email reminder sent before the training session

Correct answer: A signed training attendance record or roster with the date, topic, and trainer's name

A signed roster documenting who attended, what was covered, the date, and the trainer provides verifiable proof of training completion.

Question 64: A worker on a demolition project is exposed to asbestos-containing materials. Under OSHA 29 CFR 1926.1101, the minimum PPE required for Class I asbestos work includes:

Supplied-air respirator in pressure-demand mode and full-body protective clothing with hood (Correct answer)
PAPR with HEPA filter and regular work clothes
Half-face APF respirator with P100 filters and disposable coveralls
N100 disposable respirator and chemical-resistant gloves

Correct answer: Supplied-air respirator in pressure-demand mode and full-body protective clothing with hood

Class I asbestos work (removal of TSI or surfacing ACM) requires a supplied-air respirator in pressure-demand mode and full protective clothing including hood and gloves.

Question 65: The Haddon Matrix is a systematic tool used in incident investigation. What are its two analytical dimensions?

It uses two columns only: worker behavior and environmental conditions
It covers equipment, human, and procedural factors across design and operations phases
It analyzes only immediate and root causes in two separate columns
Host/Agent/Environment (columns) across Pre-event/Event/Post-event phases (rows) — creating a 3x3 grid to identify intervention opportunities at each phase (Correct answer)

Correct answer: Host/Agent/Environment (columns) across Pre-event/Event/Post-event phases (rows) — creating a 3x3 grid to identify intervention opportunities at each phase

The Haddon Matrix creates a 3×3 grid analyzing Host (human), Agent/Vehicle (energy source), and Environment (physical/social) across pre-event, event, and post-event phases to systematically identify countermeasures.

Question 66: What is the PRIMARY purpose of establishing a safety accountability system within a construction safety program?

To satisfy insurance company requirements
To assign blame when incidents occur
To ensure all levels of the organization have defined safety responsibilities and consequences (Correct answer)
To reduce the need for safety training

Correct answer: To ensure all levels of the organization have defined safety responsibilities and consequences

A safety accountability system defines responsibilities at every organizational level and establishes consequences for both compliance and non-compliance with safety expectations.

Question 67: What is the maximum free fall distance permitted when using a personal fall arrest system?

4 feet
8 feet
12 feet
6 feet (Correct answer)

Correct answer: 6 feet

OSHA 1926.502(d)(16)(iii) limits the maximum arresting force and requires that free fall distance not exceed 6 feet.

Question 68: A contractor is working at heights and must decide between a personal fall arrest system and a positioning device. What is the key functional difference?

Positioning devices arrest free falls; personal fall arrest systems limit movement
Both serve the same function but differ only in anchor strength requirements
Positioning devices are required above 10 feet; personal fall arrest systems are required above 6 feet
Personal fall arrest systems stop free falls; positioning devices hold workers in place to work with both hands free (Correct answer)

Correct answer: Personal fall arrest systems stop free falls; positioning devices hold workers in place to work with both hands free

A personal fall arrest system (PFAS) stops a worker after a free fall begins, while a positioning device keeps the worker supported hands-free at an elevated work position.

Question 69: Under OSHA 1926.35, what must be included in an Emergency Action Plan (EAP) for construction sites?

Location of first aid kits and AEDs only
Only emergency contact phone numbers
Fire extinguisher placement and annual inspection records
Evacuation procedures and routes, procedures for employees who remain to operate critical operations, procedures to account for all employees after evacuation, rescue and medical duties, means of reporting emergencies, and names of contacts for more information (Correct answer)

Correct answer: Evacuation procedures and routes, procedures for employees who remain to operate critical operations, procedures to account for all employees after evacuation, rescue and medical duties, means of reporting emergencies, and names of contacts for more information

OSHA 1926.35 requires an EAP to include evacuation procedures and routes, procedures for remaining employees, accountability procedures, rescue and medical duties, emergency reporting procedures, and a contact person for more information.

Question 70: What does a yellow color-coding designation typically indicate on construction sites under ANSI/ISEA standards?

Fire safety equipment location
Radiation hazard area
First aid equipment location
Caution or physical hazard (Correct answer)

Correct answer: Caution or physical hazard

Yellow is the standard color for caution and physical hazards such as tripping, falling, or striking hazards under ANSI safety color standards.

Question 71: What is the primary purpose of Lockout/Tagout (LOTO) procedures under OSHA 29 CFR 1910.147?

To control hazardous energy and prevent the unexpected energization or release of stored energy during servicing and maintenance (Correct answer)
To establish a chain of custody for equipment keys
To document equipment maintenance history
To alert workers of equipment that is out of service for repairs

Correct answer: To control hazardous energy and prevent the unexpected energization or release of stored energy during servicing and maintenance

OSHA 1910.147 establishes LOTO as the procedure for controlling hazardous energy — electrical, mechanical, hydraulic, pneumatic, chemical, thermal — to protect workers during equipment servicing and maintenance.

Question 72: What is a 'critical lift plan,' and for which types of lifts is it required?

A mandatory OSHA form required for all crane lifts regardless of load
A permit only required when the load exceeds the crane's rated capacity
A documented analysis and plan required for lifts exceeding 75% of rated capacity, tandem lifts, or lifts over energized power lines or occupied areas (Correct answer)
A plan prepared only for tower crane assembly and disassembly

Correct answer: A documented analysis and plan required for lifts exceeding 75% of rated capacity, tandem lifts, or lifts over energized power lines or occupied areas

Critical lift plans are required for specific high-risk lift scenarios — typically lifts exceeding 75% of rated capacity, tandem or multi-crane lifts, and lifts over occupied structures or energized power lines.

Question 73: When must a fit test be conducted for a tight-fitting respirator under OSHA's Respiratory Protection Standard?

Only before initial use of the respirator
Every 6 months regardless of any changes
Before initial use, annually, and when facial changes occur (Correct answer)
Only when the worker reports discomfort

Correct answer: Before initial use, annually, and when facial changes occur

OSHA 29 CFR 1926.103 requires fit testing before initial use, at least annually thereafter, and whenever changes occur that could affect the seal, such as significant weight loss or dental work.

Question 74: Which hierarchy of controls level offers the MOST reliable protection from a recognized construction hazard?

Engineering controls — installing guards or ventilation systems
Elimination — physically removing the hazard from the workplace (Correct answer)
Administrative controls — changing worker schedules or procedures
Personal protective equipment — providing respirators and gloves

Correct answer: Elimination — physically removing the hazard from the workplace

Elimination removes the hazard entirely, making exposure impossible and providing the highest level of protection in the hierarchy.

Question 75: Which factor most directly determines the required travel distance to a fire extinguisher on a construction site for Class B hazards?

The size and rating of the extinguisher relative to the hazard (Correct answer)
The extinguisher's weight
The number of workers on site
The type of construction materials used

Correct answer: The size and rating of the extinguisher relative to the hazard

OSHA requires extinguishers for Class B hazards to be placed so travel distance does not exceed 50 feet, with rating matched to hazard size.

Question 76: Which type of anchorage is required when two workers use the same anchor point for a personal fall arrest system?

A 10,000-lb rated anchor (Correct answer)
Two separate 5,000-lb anchors
5,000-lb rated anchor
A certified structural engineer must approve any shared anchor

Correct answer: A 10,000-lb rated anchor

When two workers share a single anchorage, the anchor must be rated to at least 10,000 pounds to accommodate both.

Question 77: A construction electrician is testing an energized 480V circuit. Which PPE at minimum does NFPA 70E require?

Rubber insulating gloves rated for the voltage and appropriate eye protection (Correct answer)
A full arc flash suit regardless of task duration
A hard hat and Class E boots only
Standard leather gloves and safety glasses

Correct answer: Rubber insulating gloves rated for the voltage and appropriate eye protection

Rubber insulating gloves rated for 480V (minimum Class 00 for shock protection) and eye protection are the minimum PPE required when working on or near exposed energized parts at this voltage.

Question 78: When investigating a near-miss event involving a scaffold plank failure, the investigator should FIRST:

Interview the injured worker in the presence of management
Photograph and preserve the scene before disturbance (Correct answer)
Repair the scaffold and resume work
Submit the OSHA 301 form within 7 days

Correct answer: Photograph and preserve the scene before disturbance

Preserving the scene through photographs and physical evidence before any disturbance is the critical first step in a valid incident investigation.

Question 79: What is the primary purpose of a pre-incident plan (pre-fire plan) developed for a construction site?

To schedule fire drills for workers
To provide responding emergency services with site-specific information (Correct answer)
To document worker injuries for insurance
To satisfy OSHA recordkeeping requirements

Correct answer: To provide responding emergency services with site-specific information

Pre-incident plans give responding fire departments critical site layout, hazard, and access information before an emergency occurs.

Question 80: Which of the following BEST describes a 'contributing cause' in incident investigation terminology?

An act of God or uncontrollable environmental factor
The regulatory violation cited by the OSHA inspector
A condition that alone would not cause the incident but increased its likelihood or severity (Correct answer)
The single root cause that directly triggered the incident

Correct answer: A condition that alone would not cause the incident but increased its likelihood or severity

Contributing causes are factors that increase the probability or severity of an incident but are insufficient on their own to cause it without the presence of other causes.

Question 81: In confined space operations involving multiple employers on a construction site, what does OSHA require?

Each employer must establish a completely independent entry program with no coordination
Employers must coordinate entry operations and share information about space hazards with each other (Correct answer)
The employer with the most workers assumes full safety responsibility
Only the controlling contractor's safety program applies to all workers

Correct answer: Employers must coordinate entry operations and share information about space hazards with each other

Under 29 CFR 1926 Subpart AA, when multiple employers are involved, they must coordinate entry operations and exchange relevant information about space hazards and entry procedures to protect all workers.

Question 82: Which hierarchy of controls level offers the highest level of worker protection?

PPE
Administrative controls
Engineering controls
Elimination (Correct answer)

Correct answer: Elimination

Elimination removes the hazard entirely, making it the most effective level in the hierarchy of controls.

Question 83: Which OSHA standard specifically governs occupational exposure to crystalline silica in construction?

29 CFR 1926.55
29 CFR 1926.1153 (Correct answer)
29 CFR 1926.1101
29 CFR 1926.62

Correct answer: 29 CFR 1926.1153

29 CFR 1926.1153 is OSHA's construction-specific silica standard, setting a PEL of 50 µg/m³ as an 8-hour TWA and requiring exposure control plans.

Question 84: What is the Plan-Do-Check-Act (PDCA) cycle, and how does it apply to construction safety management systems per ANSI Z10 and ISO 45001?

PDCA is an OSHA-mandated audit process for contractors with more than 100 workers
PDCA is a continuous improvement cycle: Plan (set objectives and identify hazards), Do (implement controls and programs), Check (monitor and measure performance), Act (correct deficiencies and improve the system) (Correct answer)
PDCA is a hazard reporting form used by OSHA during inspections
PDCA refers to the four phases of a construction project: Planning, Design, Construction, Acceptance

Correct answer: PDCA is a continuous improvement cycle: Plan (set objectives and identify hazards), Do (implement controls and programs), Check (monitor and measure performance), Act (correct deficiencies and improve the system)

The Plan-Do-Check-Act cycle from quality management has been adopted by ANSI Z10 and ISO 45001 as the framework for continuous improvement of occupational health and safety management systems.

Question 85: Which approach BEST ensures that lessons learned from a serious incident are communicated effectively across all crews on a large construction site?

Sending an email to all supervisors with incident details
Posting a written summary on the safety bulletin board
Updating the project safety plan and filing it with HR
Conducting structured safety stand-downs with interactive discussion at each crew level (Correct answer)

Correct answer: Conducting structured safety stand-downs with interactive discussion at each crew level

Interactive stand-downs with each crew ensure two-way communication, comprehension, and direct application of lessons to specific work tasks.

Question 86: What does OSHA require regarding access to scaffold platforms more than 2 feet above or below a point of access?

A portable ladder may be used at any height
Workers may use scaffold cross-bracing if no other access exists
Safe access must be provided such as a ladder, stairway, or ramp (Correct answer)
Access is only required if the scaffold is over 10 feet high

Correct answer: Safe access must be provided such as a ladder, stairway, or ramp

OSHA requires safe access — ladder, stairway, ramp, or integral prefabricated scaffold access — whenever the platform is more than 2 feet above or below access points.

Question 87: What does a 'training needs analysis' (TNA) determine before developing a construction safety program?

The gap between current worker knowledge/skills and required competency levels (Correct answer)
How many training hours are required by the general industry standard
Which OSHA standards apply to the specific project type
The total cost of delivering training to all workers

Correct answer: The gap between current worker knowledge/skills and required competency levels

A TNA identifies the difference between existing and required performance levels, ensuring training addresses actual gaps rather than assumed ones.

Question 88: According to 29 CFR 1926 Subpart P, what is the maximum lateral distance a worker may travel within a trench to reach a means of egress?

25 feet (Correct answer)
15 feet
100 feet
50 feet

Correct answer: 25 feet

OSHA standard 1926.651(c)(2) requires that a stairway, ladder, ramp, or other safe means of egress be located in trench excavations that are 4 feet or more in depth so as to require no more than 25 feet of lateral travel for employees.

Question 89: An employee slips on ice at the employer's parking lot while walking into work. Under OSHA recordkeeping, this injury is generally:

Recordable only if the employee lost more than one day of work
Recordable because it occurred on employer property
Recordable if the employer failed to apply ice melt
Not recordable because the parking lot is excluded from the work environment definition (Correct answer)

Correct answer: Not recordable because the parking lot is excluded from the work environment definition

OSHA exempts injuries in employer-controlled parking lots, loading docks, and access roads during normal commuting from the definition of the work environment, so such injuries are generally not recordable.

Question 90: What is the maximum free-fall distance allowed when using a personal fall arrest system on a construction site?

4 feet
6 feet (Correct answer)
10 feet
8 feet

Correct answer: 6 feet

OSHA 29 CFR 1926.502(d)(16) limits free fall to no more than 6 feet before the fall arrest system activates.

Question 91: Which soil test involves rolling a moist soil sample into a thread and observing if it crumbles?

Pocket penetrometer test
Ribbon test
Thumb penetration test
Thread test (Correct answer)

Correct answer: Thread test

The thread test (dry strength test) checks cohesion by rolling soil into a 1/8-inch thread; if it holds, the soil has higher cohesion.

Question 92: What is the purpose of a tag line during a crane lift?

To signal the operator when to stop hoisting
To connect the crane's block to the rigging hardware
To control load swing and rotation without personnel being in the load path (Correct answer)
To anchor the load to the ground until lifting begins

Correct answer: To control load swing and rotation without personnel being in the load path

Tag lines allow ground workers to guide and stabilize a suspended load while keeping them out of the hazardous zone directly under or near the load.

Question 93: An effective safety and health program requires management commitment and employee involvement. Which of the following actions best demonstrates a commitment to employee involvement?

Issuing a written safety policy signed by the company president.
Establishing a joint labor-management safety committee that meets regularly. (Correct answer)
Developing a disciplinary policy for employees who report hazards.
Holding managers solely responsible for all safety inspections.

Correct answer: Establishing a joint labor-management safety committee that meets regularly.

Employee involvement is a critical element of an effective safety program. A joint labor-management safety committee provides a formal structure for workers to participate in hazard identification, program development, and decision-making, ensuring their voices are heard and valued. While a written policy is a part of management commitment, the committee actively demonstrates employee involvement.

Question 94: A construction worker is grinding metal indoors without ventilation. Which combination of PPE is MOST critical to prevent both respiratory and eye hazards?

Safety glasses and a surgical mask
A face shield and an N95 respirator
Goggles and a PAPR with HEPA filter (Correct answer)
Welding helmet and a dust mask

Correct answer: Goggles and a PAPR with HEPA filter

Goggles provide better splash and particle protection than glasses, and a PAPR with HEPA filter offers powered air-purifying respiratory protection against metal dust in a poorly ventilated space.

Question 95: A contractor is excavating a trench that will be 22 feet deep. Which of the following is required for the protective system design?

Approval by the site's competent person.
Benching appropriate for Type B soil.
Selection from the manufacturer's tabulated data.
Design by a registered professional engineer. (Correct answer)

Correct answer: Design by a registered professional engineer.

OSHA standard 1926.652(c) requires that for excavations 20 feet deep or greater, the protective system must be designed by a registered professional engineer or be based on tabulated data prepared and/or approved by a registered professional engineer.

Question 96: The IDLH (Immediately Dangerous to Life or Health) value for a chemical represents:

The maximum concentration from which an unprotected worker can escape within 30 minutes without irreversible health effects (Correct answer)
The level at which a chemical becomes flammable in air
The permissible exposure limit set by OSHA for an 8-hour workday
The concentration that causes no observable effect after 8 hours of exposure

Correct answer: The maximum concentration from which an unprotected worker can escape within 30 minutes without irreversible health effects

IDLH is defined by NIOSH as the maximum concentration from which a worker could escape within 30 minutes without experiencing escape-impairing symptoms or irreversible health effects.

Question 97: Which scenario most accurately describes a 'fissured' soil condition that affects soil classification?

Soil that has been compacted by heavy machinery
Soil that is damp and cohesive with no visible cracks
Soil with a high clay content that retains shape when squeezed
Soil with cracks or tension fractures visible in the trench wall (Correct answer)

Correct answer: Soil with cracks or tension fractures visible in the trench wall

Fissured soil contains visible cracks or fractures that indicate internal failure planes, reducing its cohesive strength and requiring reclassification to Type B or C.

Question 98: Under OSHA's fall protection standards for construction, which activity has a fall protection trigger height of 6 feet?

Leading edge work (Correct answer)
Bridge inspection
Precast concrete erection
Excavation work

Correct answer: Leading edge work

Leading edge work falls under the general construction fall protection trigger of 6 feet per 29 CFR 1926.502.

Question 99: Which condition makes using tagout instead of lockout acceptable under 29 CFR 1910.147?

The work will take less than 15 minutes
The task is performed by a qualified electrician
The energy source is electrical rather than mechanical
The energy-isolating device is not capable of being locked out and the employer can demonstrate equal protection (Correct answer)

Correct answer: The energy-isolating device is not capable of being locked out and the employer can demonstrate equal protection

Tagout alone is permitted only when the energy-isolating device cannot physically accept a lock AND the employer provides equivalent protection through additional means.

Question 100: What must be done before moving a mobile scaffold?

Both lower the platform and verify no workers or materials are on it
Check that all casters are unlocked
Lower the platform to its lowest position
Ensure no workers or materials are on the scaffold (Correct answer)

Correct answer: Ensure no workers or materials are on the scaffold

All workers and materials must be removed from a mobile scaffold before it is moved to prevent falls.

Question 101: Which class of hard hat provides both impact protection and electrical insulation up to 20,000 volts?

Class B (Correct answer)
Class A
Class E
Class C

Correct answer: Class B

Class B hard hats are designed to protect against impact and penetration from falling objects AND provide electrical insulation rated up to 20,000 volts, making them appropriate for work near high-voltage electrical hazards.

Question 102: What does the hierarchy of controls prescribe as the MOST effective method to reduce workplace hazards?

Elimination (Correct answer)
Administrative controls
Engineering controls
Personal protective equipment

Correct answer: Elimination

Elimination—physically removing the hazard—is the most effective control measure in the hierarchy because it completely removes the risk.

Question 103: What is the OSHA-required voltage threshold below which electrical work is generally considered low-voltage on construction sites?

24 volts
240 volts
120 volts
50 volts (Correct answer)

Correct answer: 50 volts

OSHA generally considers 50 volts as the threshold below which electrical shock hazards are significantly reduced, though hazards can still exist.

Question 104: Which scaffolding safety requirement under OSHA 29 CFR 1926.451 specifies the minimum load-bearing capacity that supported scaffolds must be capable of supporting?

2 times the intended load
5 times the intended load
3 times the intended load
4 times the intended load (Correct answer)

Correct answer: 4 times the intended load

OSHA 1926.451(a)(1) requires supported scaffolds to be capable of supporting without failure their own weight and at least 4 times the maximum intended load applied or transmitted to them.

Question 105: A supervisor fails to report a recordable injury to the safety department for 10 days. Which OSHA standard is most likely violated?

29 CFR 1904.29 — Forms (Correct answer)
29 CFR 1926.20 — General safety and health provisions
29 CFR 1904.14 — Recording criteria for cases involving medical removal
29 CFR 1904.32 — Annual summary

Correct answer: 29 CFR 1904.29 — Forms

29 CFR 1904.29 requires that OSHA 300 Log entries be made within 7 calendar days of learning that a recordable incident occurred.

Question 106: What does the 'action level' represent in OSHA's chemical exposure standards, and what obligations does it trigger?

The same concentration as the PEL
The IDLH concentration divided by 10
The concentration at which medical surveillance, exposure monitoring, and preventive programs are required — typically set at half the PEL (Correct answer)
The concentration at which work must immediately stop

Correct answer: The concentration at which medical surveillance, exposure monitoring, and preventive programs are required — typically set at half the PEL

The action level, typically set at half the PEL, triggers medical surveillance, exposure monitoring, training, and preventive programs even though the legal maximum exposure has not been exceeded.

Question 107: Under OSHA definitions, 'engulfment' in a confined space refers to:

An entrant becoming disoriented due to toxic atmospheric conditions
The collapse of a confined space wall or ceiling onto an entrant
The surrounding and effective capture of a person by finely divided solids or liquid (Correct answer)
A rapid drop in oxygen levels that incapacitates an entrant

Correct answer: The surrounding and effective capture of a person by finely divided solids or liquid

OSHA defines engulfment as the surrounding and effective capture of a person by a liquid or finely divided flowable solid, which can cause asphyxiation, strangulation, constriction, or crushing.

Question 108: What does RCRA stand for in the context of hazardous waste management?

Restricted Chemical Release Act
Risk Control and Remediation Authority
Resource Conservation and Recovery Act (Correct answer)
Regulated Chemical Removal and Assessment

Correct answer: Resource Conservation and Recovery Act

RCRA stands for the Resource Conservation and Recovery Act, which governs the management and disposal of hazardous waste in the US.

Question 109: A synthetic web sling is rejected when an inspection reveals what condition?

A sewn tag that is difficult to read
Slight color fading from UV exposure
Minor surface dirt on the webbing
Broken or cut load-bearing fibers (Correct answer)

Correct answer: Broken or cut load-bearing fibers

Broken or cut load-bearing fibers directly reduce the sling's rated capacity and require immediate removal from service.

Question 110: Under OSHA's cranes and derricks standard (29 CFR 1926.1408), what is the minimum required clearance distance from energized power lines up to 50 kV when no encroachment prevention measures are in place?

15 feet
10 feet (Correct answer)
5 feet
20 feet

Correct answer: 10 feet

OSHA requires a minimum 10-foot clearance from energized power lines up to 50 kV unless the line is de-energized or an exception applies.

Question 111: What is the minimum proof test load for a new hook before it is placed into service?

200% of rated load
100% of rated load
125% of rated load (Correct answer)
150% of rated load

Correct answer: 125% of rated load

ASME B30.10 requires hooks to be proof-tested to 125% of their rated load before initial use to verify structural integrity.

Question 112: According to OSHA, how often must ground-fault circuit interrupters (GFCIs) be tested on construction sites when using the assured equipment grounding conductor program alternative?

Daily before first use
Monthly
Weekly
Before each use and at regular intervals not exceeding 3 months (Correct answer)

Correct answer: Before each use and at regular intervals not exceeding 3 months

Under the assured equipment grounding conductor program, equipment must be tested before first use, after repair, and at intervals not exceeding 3 months.

Question 113: What definition of "recommended weight limit" (RWL) is the most accurate?

A lifting weight of 50 pounds for healthy male workers and 30 pounds for healthy female workers
The weight at which a back-support apparatus should be worn
The maximum weight associated with a body mass index of 25 (threshold of “overweight”)
The maximum weight that healthy workers could safely lift for up to eight hours (Correct answer)

Correct answer: The maximum weight that healthy workers could safely lift for up to eight hours

The weight that healthy workers could lift for up to eight hours without increasing their risk of musculoskeletal injuries is known as the recommended weight limit (RWL). It is determined as the result of multiplying the load constant by the horizontal, vertical, distance, asymmetry, frequency, and coupling multipliers.

Question 114: What does the acronym 'SMART' stand for when setting safety performance objectives?

Systematic, Measurable, Actionable, Realistic, Trackable
Specific, Measurable, Achievable, Relevant, Time-bound (Correct answer)
Strategic, Motivational, Accountable, Reviewable, Targeted
Safety, Management, Assessment, Reporting, Training

Correct answer: Specific, Measurable, Achievable, Relevant, Time-bound

SMART goals in safety management are Specific (clearly defined), Measurable (quantifiable), Achievable (realistic given resources), Relevant (aligned with organizational safety priorities), and Time-bound (with a defined deadline).

Question 115: Which OSHA standard specifically addresses the Hazard Communication requirements for chemical health hazards on construction sites?

29 CFR 1926.65
29 CFR 1926.1101
29 CFR 1926.62
29 CFR 1926.59 (Correct answer)

Correct answer: 29 CFR 1926.59

29 CFR 1926.59 is the Hazard Communication standard for construction, requiring employers to inform workers about chemical hazards through labels, SDSs, and training.

Question 116: What is the purpose of a 'Knox Box' installed at the entrance to a major construction project?

To provide fire departments keyed access without forced entry (Correct answer)
To house the project's MSDS/SDS binder
To contain emergency medical supplies
To store worker emergency contact cards

Correct answer: To provide fire departments keyed access without forced entry

A Knox Box is a secure key storage system that allows fire departments to access buildings or sites quickly without damaging doors or gates.

Question 117: Under what circumstance may workers enter an unprotected excavation less than 5 feet deep?

When the soil is visually assessed as stable by the crew foreman
When the work will be completed in under 30 minutes
Only when a competent person determines there is no cave-in hazard (Correct answer)
Never — all excavations require protection regardless of depth

Correct answer: Only when a competent person determines there is no cave-in hazard

OSHA 1926.652(a) allows excavations under 5 feet to go unprotected only if a competent person examines the ground and finds no cave-in potential.

Question 118: How far must excavated soil and materials (spoil pile) be kept from the edge of an excavation under OSHA 1926.651?

At least 5 feet from the edge
At least 2 feet from the edge (Correct answer)
At least 3 feet from the edge
At least 4 feet from the edge

Correct answer: At least 2 feet from the edge

OSHA 1926.651(j)(2) requires that excavated material and equipment be kept at least 2 feet from the edges of excavations to prevent cave-in hazards from surcharge loads.

Question 119: The maximum compressed air pressure for cleaning tasks is ________ psi, as per OSHA rule 29 CFR 1926.302.

30 (Correct answer)
40
25
20

Correct answer: 30

Only compressed air at a pressure lower than 30 psi may be used for cleaning tasks, according to OSHA regulation 29 CFR 1926.302.

Question 120: What action must be taken before an excavation is entered each day or after a rainstorm?

Have a competent person inspect for hazardous conditions (Correct answer)
Test air quality for all four atmospheric hazards
Erect additional barrier fencing around the perimeter
Complete a new permit application

Correct answer: Have a competent person inspect for hazardous conditions

OSHA 1926.651(k) requires a competent person to inspect excavations daily and after any event that could increase hazard potential, such as rain.

Question 121: When evaluating a construction site's safety program, a CHST finds the experience modification rate (EMR) is 1.35. What does this indicate?

The company has 35% fewer injuries than average
The company qualifies for safety incentive bonuses
The company is exempt from OSHA inspections
The company's workers' comp costs are 35% above industry average (Correct answer)

Correct answer: The company's workers' comp costs are 35% above industry average

An EMR above 1.0 indicates a worse-than-average injury history; 1.35 means costs are approximately 35% higher than the industry average.

Question 122: Which OSHA standard requires employers to establish a written Hazard Communication Program on construction sites?

29 CFR 1926.451
29 CFR 1926.651
29 CFR 1926.59 (Correct answer)
29 CFR 1926.502

Correct answer: 29 CFR 1926.59

29 CFR 1926.59 is the Hazard Communication standard for construction, requiring written programs, SDSs, and worker training on chemical hazards.

Question 123: According to OSHA's Hazard Communication Standard (HazCom 2012), what must be readily accessible to construction workers who handle hazardous chemicals on site?

The site supervisor's emergency contact information
A first aid kit with chemical antidotes
The chemical manufacturer's phone number only
Safety Data Sheets for all hazardous chemicals present (Correct answer)

Correct answer: Safety Data Sheets for all hazardous chemicals present

OSHA's HazCom standard requires that Safety Data Sheets be readily accessible to all employees who may be exposed to hazardous chemicals during their work shift.

Question 124: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), who is generally the only person authorized to remove a lock or tag from an energy isolating device?

Any qualified electrician on site.
The employee who initially applied the lock or tag. (Correct answer)
The competent person for the jobsite.
The site supervisor for the work crew.

Correct answer: The employee who initially applied the lock or tag.

OSHA standard 29 CFR 1910.147(e)(3) is very clear that the lock and tag must be removed by the employee who applied it. This ensures that the person who is in control of the hazardous energy is the one to re-energize the equipment. There are specific procedures for rare exceptions when the authorized employee is not available, but the primary rule is personal removal.

Question 125: According to ANSI/ISEA 107, which class of high-visibility safety apparel provides the highest level of conspicuity and is required for workers near high-speed roadways?

Class 1
Class E
Class 2
Class 3 (Correct answer)

Correct answer: Class 3

Class 3 high-visibility apparel offers the greatest visibility and is required for workers in high-speed, complex traffic environments where full-body visibility is needed.

Question 126: A construction company wants to benchmark its safety performance against industry peers. Which data source provides the most standardized comparison?

Insurance carrier loss runs
OSHA 300 logs shared voluntarily by peers
BLS Survey of Occupational Injuries and Illnesses by NAICS code (Correct answer)
Internal near-miss logs

Correct answer: BLS Survey of Occupational Injuries and Illnesses by NAICS code

The BLS Survey of Occupational Injuries and Illnesses provides industry-wide TRIR and DART rates organized by NAICS code, enabling standardized benchmarking.

Question 127: What does the acronym 'IDLH' stand for in confined space and respiratory protection standards?

Industrial Default Limit for Hazard
Immediate Danger to Life and Health (Correct answer)
Incident Detection Level for Hazardous materials
Inhalation Dose Limit for Humans

Correct answer: Immediate Danger to Life and Health

IDLH (Immediately Dangerous to Life or Health) defines exposure concentrations that pose an immediate threat.

Question 128: A construction safety technician must communicate a change in excavation procedures to multiple subcontractors. What is the MOST effective approach?

Post the updated procedure on the project website
Call each subcontractor's office and leave a voicemail
Hold a pre-task meeting with all affected subcontractor supervisors and document attendance (Correct answer)
Update the written safety plan and assume subcontractors will read it

Correct answer: Hold a pre-task meeting with all affected subcontractor supervisors and document attendance

A pre-task meeting with affected supervisors ensures direct communication, allows for questions, and provides documented proof that the information was conveyed.

Question 129: A safety net system must be installed no more than how far below the working surface it protects?

30 feet
25 feet (Correct answer)
20 feet
10 feet

Correct answer: 25 feet

OSHA 29 CFR 1926.502(c)(1) requires safety nets to be installed no more than 30 feet below the working surface — wait, actually the correct OSHA standard requires nets within 30 feet; the correct answer here is 30 feet per OSHA.

Question 130: Which of the following BEST demonstrates that construction workers have retained and understood a safety training session?

Workers sign the attendance log at the end of the session
Workers verbally confirm they understood the material when asked
Workers score at least 70% on a multiple-choice written test
Workers can accurately demonstrate the safe procedure in the field (Correct answer)

Correct answer: Workers can accurately demonstrate the safe procedure in the field

Behavioral demonstration—actually performing the safe procedure correctly—is the gold standard for verifying training comprehension. Signatures and verbal confirmations only prove attendance, while written tests alone do not confirm workers can apply knowledge to real tasks.

Question 131: Under OSHA 1926.502, what must an employer do after a worker has experienced a fall arrest using a personal fall arrest system?

Remove the system from service immediately and have it inspected by a competent person before re-use (Correct answer)
Replace only the lanyard, not the harness
Allow re-use if visual inspection shows no damage
Tag the system as inspected and return it to service

Correct answer: Remove the system from service immediately and have it inspected by a competent person before re-use

OSHA 1926.502(d)(20) requires that PFAS components subjected to impact loading must be immediately removed from service and not used again until inspected and determined by a competent person to be undamaged.

Question 132: When conducting a Job Hazard Analysis (JHA), which step comes FIRST in the process?

Identify hazards associated with each step
Select the job to be analyzed (Correct answer)
Break the job into steps
Determine preventive measures

Correct answer: Select the job to be analyzed

The first step in a JHA is selecting the job to be analyzed, typically prioritizing jobs with high injury rates, near-misses, or new/changed procedures.

Question 133: According to OSHA 29 CFR 1926.651, how deep must an excavation be before a competent person is required to classify soil and implement protective systems?

6 feet
5 feet (Correct answer)
4 feet
3 feet

Correct answer: 5 feet

OSHA 1926.651 requires that excavations 5 feet or deeper have a protective system (sloping, shoring, or trench box) unless the excavation is in stable rock, and a competent person must classify the soil to determine the appropriate system.

Question 134: Which action should be taken FIRST to lessen a painter's exposure to volatile organic compounds (VOCs) contained in oil-based paint, according to the hierarchy of controls?

Reduce the amount of time the worker paints on any given day.
Replace the paint with a water-based formulation. (Correct answer)
Restrict oil-based paints to exterior application only.
Provide the painter with an air-purifying respirator with organic vapor cartridges.

Correct answer: Replace the paint with a water-based formulation.

The hierarchy of controls is set up so that the best hazard mitigation strategy is chosen before less protective ones. Elimination is the first factor to be taken into account when using this theory; if there is no danger, there is no hazard. VOC exposure can be avoided by switching to a water-based paint instead of an oil-based one.

Question 135: Which of the following is the maximum asbestos fiber concentration for an eight-hour exposure allowed by 29 CFR 1926.1101?

100 fibers per cubic centimeter of air
10 fibers per cubic centimeter of air
0.1 fibers per cubic centimeter of air (Correct answer)
0.25 fibers per cubic centimeter of air

Correct answer: 0.1 fibers per cubic centimeter of air

According to 29 CFR 1926.1101, an employer is required to make sure that no employee is exposed to more than 0.1 fibers of asbestos per cubic centimeter of air over the course of an eight-hour shift.

Question 136: When multiple workers are performing LOTO on the same equipment, what device allows each authorized employee to apply their own personal lock?

A lock box system with one key
A tagout-only system when more than 5 workers are involved
A single master lock shared by supervisors
A hasp (multi-hole lockout device) (Correct answer)

Correct answer: A hasp (multi-hole lockout device)

Group lockout requires a hasp — a multi-hole device attached to the energy isolation point — so each authorized employee applies their own personal lock, ensuring no single person can restore energy until every worker removes their lock.

Question 137: A construction crew is using a 120-volt portable generator to power cord-and-plug tools on a job site. To best protect workers from electric shock, the receptacles on the generator should be protected by a:

Ground-fault circuit-interrupter (GFCI) (Correct answer)
Surge protector
Double-insulated housing
Fuse rated for the tool's amperage

Correct answer: Ground-fault circuit-interrupter (GFCI)

OSHA 29 CFR 1926.404(b)(1) requires that all 120-volt, single-phase, 15- and 20-ampere receptacle outlets on construction sites, which are not part of the permanent wiring, be protected by ground-fault circuit-interrupters (GFCIs). GFCIs are essential for shock protection with portable equipment where grounding may be compromised.

Question 138: A trench is 7 feet deep in Type A soil with no other hazards. Which protective system option is acceptable under OSHA Appendix B?

Sloping at 1.5H:1V
Vertical walls with timber shoring only
No protection required if workers are experienced
Sloping at 0.75H:1V (Correct answer)

Correct answer: Sloping at 0.75H:1V

Type A soil allows a maximum allowable slope of 0.75H:1V (approximately 53 degrees), making it the least flat slope permissible by OSHA.

Question 139: A precast concrete plank is being set by crane. Under OSHA 29 CFR 1926 Subpart Q, workers may not stand on a precast section until:

It has been secured to prevent movement and a competent person has determined it is stable (Correct answer)
The crane tension is released and the tag line is removed
The plank has been in position for at least 30 minutes
At least two adjacent planks have been set to provide lateral stability

Correct answer: It has been secured to prevent movement and a competent person has determined it is stable

OSHA 1926.704(c) allows workers on precast elements only after the section has been adequately secured against movement and a competent person has determined stability. The standard focuses on secured position and competent-person determination, not on time elapsed or number of adjacent panels.

Question 140: Which type of air-purifying respirator is appropriate for protection against organic vapors and acid gas hazards?

N95 filtering facepiece
Powered air-purifying respirator with P100 filters
Combination OV/acid gas cartridge (Correct answer)
HEPA filter cartridge

Correct answer: Combination OV/acid gas cartridge

A combination organic vapor/acid gas cartridge respirator provides protection against both organic solvent vapors and acid gases simultaneously.

Question 141: When evaluating the effectiveness of safety training, which level of Kirkpatrick's model assesses whether behavior changed on the job?

Level 3 – Behavior (Correct answer)
Level 2 – Learning
Level 4 – Results
Level 1 – Reaction

Correct answer: Level 3 – Behavior

Kirkpatrick's Level 3 (Behavior) evaluates whether trainees apply what they learned back on the job, measuring actual transfer of training to the work environment.

Question 142: When conducting a pre-task safety analysis for hot work near flammable materials, a CHST should verify that a fire watch remains on duty for at least how long after welding is complete?

1 hour
30 minutes (Correct answer)
Until the next shift begins
15 minutes

Correct answer: 30 minutes

NFPA 51B and most hot work permit programs require a fire watch to remain for a minimum of 30 minutes after hot work is completed.

Question 143: Who is qualified to design a scaffold system that must support a load exceeding its rated capacity?

The general contractor's safety officer
A registered professional engineer (Correct answer)
The scaffold manufacturer's representative
Any competent person

Correct answer: A registered professional engineer

A registered professional engineer must design scaffolding systems when loads exceed standard rated capacities.

Question 144: Under OSHA's recordkeeping standard 1904.5, how is 'work-relatedness' determined for an injury or illness?

Work-relatedness is determined solely by whether the worker was on the clock at the time of injury
An injury or illness is work-related if an event or exposure in the work environment either caused or contributed to the condition, or significantly aggravated a pre-existing condition (Correct answer)
Workers' compensation board determinations govern OSHA work-relatedness
An injury is work-related only if it occurred on the employer's physical premises

Correct answer: An injury or illness is work-related if an event or exposure in the work environment either caused or contributed to the condition, or significantly aggravated a pre-existing condition

OSHA 1904.5 defines work-relatedness as any injury, illness, or aggravation of a pre-existing condition caused or contributed to by an event or exposure in the work environment — location and clock time alone do not determine work-relatedness.

Question 145: Which type of forced ventilation is most effective for purging a confined space of vapors heavier than air?

Forced air supply directed near the bottom of the space (Correct answer)
Forced air supply directed through the top of the space
Exhaust ventilation from the top of the space only
Natural ventilation through the top opening only

Correct answer: Forced air supply directed near the bottom of the space

Vapors heavier than air settle at the lowest points of confined spaces; directing forced air supply near the bottom effectively displaces and purges these vapors upward and out.

Question 146: What are the key components of effective safety training for construction workers?

Content relevance (job-specific hazards), comprehension verification (not just attendance), delivery in workers' primary language, and active learner engagement and participation (Correct answer)
Written materials, video presentations, OSHA handbooks, and toolbox talk transcripts
Duration of training, number of topics covered, test scores only, and supervisor signature
Attendance records, safety posters, OSHA regulations, and incident statistics

Correct answer: Content relevance (job-specific hazards), comprehension verification (not just attendance), delivery in workers' primary language, and active learner engagement and participation

Effective safety training must be job-specific, verify worker comprehension, be delivered in the worker's primary language, and engage workers as active participants rather than passive recipients.

Question 147: Which ergonomic risk factor most directly contributes to rotator cuff injuries among construction workers performing overhead tasks?

High-frequency hand-arm vibration
Contact stress on the palms
Whole-body vibration from equipment
Sustained or repeated shoulder elevation above 60 degrees (Correct answer)

Correct answer: Sustained or repeated shoulder elevation above 60 degrees

Sustained or repeated work with the shoulder elevated above 60° increases mechanical loading on the rotator cuff tendons and reduces blood flow, leading to tendinopathy and tears. This is a well-documented awkward-posture risk factor specific to overhead construction tasks.

Question 148: Under OSHA 1926.1402, what must be done when a crane is set up on a surface where ground bearing capacity is uncertain?

Only the crane manufacturer may approve an alternative setup
A qualified person must determine the bearing capacity and, if inadequate, use mats, cribbing, or other support to distribute the crane's load safely (Correct answer)
The operator may proceed with reduced load if the soil appears firm
The lift must be cancelled until a structural engineer inspects the site in person

Correct answer: A qualified person must determine the bearing capacity and, if inadequate, use mats, cribbing, or other support to distribute the crane's load safely

OSHA 1926.1402(b) requires a qualified person to evaluate ground conditions where cranes will be operated and to ensure the ground can safely support the crane's loads, using mats or cribbing as needed when ground is inadequate.

Question 149: Which analytical method uses a diagram shaped like a fish skeleton to systematically display causes of an incident?

Change analysis
Ishikawa (fishbone) diagram (Correct answer)
Fault tree analysis
Events and causal factor chart

Correct answer: Ishikawa (fishbone) diagram

The Ishikawa or fishbone diagram visually maps cause-and-effect relationships, organizing contributing factors into categories such as personnel, equipment, environment, and procedures.

Question 150: What is the maximum allowable body wear (reduction in original rope diameter) that causes a wire rope to be removed from service under ASME B30.2?

One-third (33%) reduction (Correct answer)
10% reduction
5% reduction
One-sixth (17%) reduction

Correct answer: One-third (33%) reduction

ASME B30.2 specifies that wire rope must be removed from service when the actual diameter is reduced by one-third or more from its nominal diameter due to wear.

Question 151: A safety manager discovers that a specific crew consistently skips the pre-task planning process. What is the MOST effective corrective action?

Conduct root-cause analysis to determine why the step is being skipped (Correct answer)
Remove the pre-task planning requirement for that crew
Issue written warnings to all crew members immediately
Transfer the crew to a different superintendent

Correct answer: Conduct root-cause analysis to determine why the step is being skipped

Root-cause analysis identifies systemic barriers or training gaps that lead to non-compliance, enabling targeted and lasting corrective action.

Question 152: A construction safety technician discovers that the company's written safety program has not been updated in three years. What should be the FIRST priority in the revision?

Redistribute the existing program to all employees
Review and update regulatory references to reflect current OSHA standards (Correct answer)
Add new sections for emerging technologies
Change the document formatting to match current company branding

Correct answer: Review and update regulatory references to reflect current OSHA standards

Ensuring regulatory references are current is the first priority because outdated compliance requirements could expose the company to citations and leave workers unprotected.

Question 153: A framing crew has several new members who do not speak English. According to OSHA requirements, how must the employer handle mandatory safety training for these workers?

Require the workers to complete an English proficiency course before starting work.
Pair them with experienced bilingual workers who can translate during the job.
Provide picture-based pamphlets and assume they will learn by observation.
Provide the training in a language and vocabulary that the workers can understand. (Correct answer)

Correct answer: Provide the training in a language and vocabulary that the workers can understand.

OSHA's training standards require employers to provide instruction in a language and vocabulary that employees can understand. If workers do not comprehend English, the employer must provide training in a language they do understand to ensure the training is effective.

Question 154: What action is required when an employee whose lock is on a piece of equipment cannot be located at shift end?

The next shift's lead can remove the lock if verbally authorized
The LOTO program allows automatic lock removal after 8 hours
Any supervisor can remove the lock with bolt cutters
Management must follow a documented procedure that includes trying to locate the employee and verifying the work area is safe before lock removal (Correct answer)

Correct answer: Management must follow a documented procedure that includes trying to locate the employee and verifying the work area is safe before lock removal

OSHA requires employers to have a documented procedure for removing another person's lock, which must include attempts to contact the employee and confirmation the area is safe.

Question 155: A construction safety manager is investigating a recurring near-miss involving struck-by incidents from overhead crane operations. Which investigation technique is BEST suited for uncovering systemic failures rather than attributing fault to individual workers?

Toolbox talk frequency audit
5 Why Analysis (Correct answer)
OSHA 300 log trend review
Witness interview checklist

Correct answer: 5 Why Analysis

The 5 Why Analysis iteratively asks 'why' until the root organizational or systemic cause is revealed, moving beyond surface-level human error. Reviewing OSHA 300 logs or witness interviews are useful supplemental tools but do not systematically surface systemic failures the way root-cause analysis does.

Question 156: According to OSHA, how often must a competent person inspect excavations where workers are exposed to hazards?

Only after a cave-in incident
Once per week
Once at the start of the project
Daily and after every rainstorm (Correct answer)

Correct answer: Daily and after every rainstorm

A competent person must inspect excavations daily before each shift, after rainstorms, and after any event that could increase the hazard of cave-in.

Question 157: Under OSHA 29 CFR 1926.652, what is the maximum allowable slope for Type C soil when using the sloping method of protection?

1H:1V (45°)
1.5H:1V (34°) (Correct answer)
0.75H:1V (53°)
2H:1V (27°)

Correct answer: 1.5H:1V (34°)

Type C soil, the least stable classification, requires a slope of 1.5H:1V (approximately 34 degrees from horizontal).

Question 158: Which electrical hazard involves a sudden release of energy from an unintended arc path that can produce temperatures up to 35,000°F and cause severe burns?

Transient overvoltage
Ground fault
Arc flash (Correct answer)
Overload

Correct answer: Arc flash

Arc flash is a sudden release of energy caused by an electrical arc, producing intense heat, pressure waves, and molten metal that can cause severe burns even at low voltages.

Question 159: During a construction site emergency evacuation, who is typically responsible for accounting for all workers at the assembly point?

The designated crew supervisor or foreman (Correct answer)
Each individual worker independently
The project owner's representative
The site safety officer

Correct answer: The designated crew supervisor or foreman

Crew supervisors or foremen are typically assigned headcount accountability at assembly areas during evacuations.

Question 160: A CHST is asked to testify as an expert witness in a construction accident lawsuit. Which ethical obligation governs their testimony?

Declining to testify to avoid potential liability to the CHST personally
Objectivity and truthfulness, presenting facts and professional opinions honestly regardless of which party retained them (Correct answer)
Loyalty to the employing company that hired them to testify
Limiting testimony only to OSHA violations and avoiding engineering opinions

Correct answer: Objectivity and truthfulness, presenting facts and professional opinions honestly regardless of which party retained them

BCSP's Code of Ethics requires certificants to be objective and truthful in professional communications, including legal testimony. An expert witness retained by one party is still obligated to provide honest, impartial professional opinions. Tailoring testimony to favor the retaining party is both an ethical violation and potential perjury.

Question 161: What is the purpose of a toeboard on a scaffold platform?

To prevent tools and materials from falling to lower levels (Correct answer)
To provide a foothold for climbing
To mark the edge of the platform for visibility
To anchor the guardrail post

Correct answer: To prevent tools and materials from falling to lower levels

Toeboards on scaffold platforms prevent tools, materials, and debris from rolling or falling off the edge to workers below.

Question 162: During a safety meeting, a worker raises a concern about a trench shoring method but is dismissed by the supervisor. What is the primary risk of this communication failure?

The meeting may run over its scheduled time
Hazard information is suppressed, increasing the likelihood of a preventable incident (Correct answer)
The supervisor may receive a poor performance review
The worker may file a frivolous OSHA complaint

Correct answer: Hazard information is suppressed, increasing the likelihood of a preventable incident

Dismissing worker safety concerns blocks hazard identification feedback loops, allowing dangerous conditions to persist uncorrected.

Question 163: A synthetic web sling must be removed from service if it shows which of the following defects?

Slight surface discoloration from UV
Missing or illegible load tag (Correct answer)
Minor surface abrasion on the edge
Stiffness from cold temperatures

Correct answer: Missing or illegible load tag

ASME B30.9 requires removal from service of any sling with a missing or illegible identification tag because rated capacity cannot be verified.

Question 164: What is the minimum frequency required for inspecting portable fire extinguishers on a construction site under OSHA standards?

Weekly
Annually
Monthly (Correct answer)
Daily

Correct answer: Monthly

OSHA requires monthly visual inspections of portable fire extinguishers to ensure they are in place, fully charged, and operational.

Question 165: What is the maximum free-fall distance allowed when using a personal fall arrest system under OSHA 1926.502?

4 feet
6 feet (Correct answer)
8 feet
10 feet

Correct answer: 6 feet

OSHA 1926.502(d)(16)(iii) limits free-fall distance to a maximum of 6 feet when using a personal fall arrest system to prevent excessive arresting forces on the body.

Question 166: Fissured soil discovered during excavation typically indicates what type of soil classification?

Type A
Type C
Type B
Type B or C depending on other factors (Correct answer)

Correct answer: Type B or C depending on other factors

Fissured soil is excluded from Type A classification and may be Type B or Type C depending on its other properties and conditions.

Question 167: Which document establishes minimum safety and health program requirements that are widely referenced by safety professionals and used as a framework for construction SMS?

NFPA 70E
OSHA 3132
ACGIH TLV Handbook
ANSI/ASSP Z10 (Correct answer)

Correct answer: ANSI/ASSP Z10

ANSI/ASSP Z10 is the American national standard for Occupational Health and Safety Management Systems, widely used as a construction SMS framework.

Question 168: What condition requires a scaffold to be immediately removed from service, regardless of other factors?

Any component is visibly bent, cracked, or structurally compromised (Correct answer)
More than 5 workers are on the scaffold simultaneously
The scaffold has been in service for more than 30 days
The scaffold is not labeled with its manufacturer's name

Correct answer: Any component is visibly bent, cracked, or structurally compromised

Scaffolds with visibly damaged or structurally compromised components must be taken out of service immediately until repaired or replaced.

Question 169: Which OSHA construction standard governs electrical safety requirements specifically for the construction industry, as distinct from general industry?

29 CFR 1926.400–449 (Correct answer)
29 CFR 1910.147
29 CFR 1910.301–399
29 CFR 1926.502

Correct answer: 29 CFR 1926.400–449

Subpart K (29 CFR 1926.400–449) of OSHA's construction standards covers electrical safety requirements specific to construction activities.

Question 170: When selecting eye protection for a worker using a pneumatic chipping hammer to remove concrete, what is the minimum required protection?

Basic safety spectacles with side shields (Correct answer)
Chemical splash goggles
Full-face shield with safety glasses underneath
Tinted sunglasses with UV protection

Correct answer: Basic safety spectacles with side shields

OSHA requires safety spectacles with side shields as minimum eye protection for impact hazards such as chipping operations, though a face shield may be added for additional protection.

Question 171: A wire rope used for rigging shows more than __ broken wires in one lay length and must be removed from service.

2
4
6 (Correct answer)
10

Correct answer: 6

Six or more broken wires in one rope lay, or three or more in one strand, is a criterion for removal from service per ASME B30.9.

Question 172: Which leading indicator is MOST useful for measuring the effectiveness of a construction safety program?

Near-miss reporting rate (Correct answer)
Days Away, Restricted, or Transferred (DART) rate
Workers' compensation cost per claim
Total Recordable Incident Rate (TRIR)

Correct answer: Near-miss reporting rate

Near-miss reporting rate is a leading indicator because it tracks events before harm occurs, enabling proactive intervention.

Question 173: What is the PRIMARY difference between a direct cause and a contributing cause in an incident investigation?

Direct causes require corrective action but contributing causes do not
Direct causes are always equipment failures while contributing causes are human errors
Contributing causes are more important than direct causes
The direct cause is the immediate event that caused the injury while contributing causes are underlying factors that allowed it to happen (Correct answer)

Correct answer: The direct cause is the immediate event that caused the injury while contributing causes are underlying factors that allowed it to happen

The direct cause is the immediate action or condition that led to the incident, while contributing causes are the underlying organizational, environmental, or behavioral factors that enabled the direct cause to occur.

Question 174: Which of the following best describes the primary role of communication in an effective Emergency Action Plan (EAP) on a construction site?

To ensure all employees understand their roles and responsibilities during an emergency. (Correct answer)
To assign blame after an incident has been resolved.
To document the emergency for insurance and liability purposes only.
To inform the media about the status of an ongoing emergency.

Correct answer: To ensure all employees understand their roles and responsibilities during an emergency.

Effective communication is crucial for an Emergency Action Plan. According to OSHA standard 29 CFR 1926.35, the plan must be reviewed with each employee. This communication ensures that everyone knows how to report emergencies, what their specific duties are (e.g., evacuation, operating fire extinguishers), and how to exit safely, which is essential for protecting lives.

Question 175: An OSHA 301 Incident Report form must be completed within how many calendar days of a recordable work-related injury or illness?

7 calendar days (Correct answer)
30 calendar days
3 calendar days
24 hours

Correct answer: 7 calendar days

29 CFR 1904.29 requires employers to complete the OSHA 301 (or an equivalent form) within 7 calendar days of receiving information that a recordable case occurred.

Question 176: Which of the following conditions would require reclassifying Type A soil to a lower classification?

Soil has been undisturbed for over a year
The excavation is less than 10 feet deep
The soil is subject to vibration from heavy traffic (Correct answer)
Soil is completely dry

Correct answer: The soil is subject to vibration from heavy traffic

Vibration from heavy traffic or other sources can destabilize Type A soil, requiring it to be reclassified to Type B or Type C.

Question 177: Which OSHA standard specifically governs the use of personal protective equipment (PPE) for eye and face protection on construction sites?

29 CFR 1926.102 (Correct answer)
29 CFR 1926.101
29 CFR 1926.100
29 CFR 1926.103

Correct answer: 29 CFR 1926.102

29 CFR 1926.102 covers eye and face protection in construction, requiring appropriate protection against flying particles, molten metal, liquid chemicals, acids, caustic liquids, chemical gases, and light radiation hazards.

Question 178: Which visual communication method is MOST effective for warning construction workers about overhead crane operations in a specific zone?

An entry in the project safety manual
Barricade tape and posted warning signs with crane swing radius markings (Correct answer)
A notation in the daily safety log
Verbal announcements over a bullhorn every hour

Correct answer: Barricade tape and posted warning signs with crane swing radius markings

Physical barricades, warning signs, and swing radius markings provide continuous, visible warnings that alert all workers entering the crane operation zone regardless of when they arrive.

Question 179: Under OSHA's lockout/tagout standard (29 CFR 1910.147), which of the following is required before servicing equipment that has multiple energy sources?

Tagout alone is acceptable for all energy sources
A single lock on the main disconnect is sufficient
All energy sources must be identified and each one individually locked out (Correct answer)
Only the primary energy source must be locked out

Correct answer: All energy sources must be identified and each one individually locked out

OSHA requires that all energy sources, including electrical, hydraulic, pneumatic, and stored energy, be identified and individually locked out before servicing.

Question 180: According to OSHA regulations for personal fall arrest systems (PFAS) in construction, when must the equipment be inspected?

Before each use by the user and annually by a competent person. (Correct answer)
At the beginning of each new project by the site supervisor.
Annually by a qualified person.
Only after a fall event has occurred.

Correct answer: Before each use by the user and annually by a competent person.

OSHA 1926.502(d)(21) requires that personal fall arrest systems be inspected prior to each use for wear, damage, and other deterioration. In addition to this user inspection, the equipment must be inspected at least annually by a competent person.

Question 181: During a periodic inspection of a LOTO program, what must the employer document?

The date, equipment serviced, employees involved, and inspector's name (Correct answer)
Insurance carrier notification of LOTO activities
The brand and model of lockout devices used
The total downtime caused by each lockout event

Correct answer: The date, equipment serviced, employees involved, and inspector's name

OSHA 1910.147(c)(6)(ii) requires annual inspections to be certified with the date, equipment, employee names, and inspector name.

Question 182: A safety technician calculates the required attenuation for hearing protection in an area with an A-weighted Time-Weighted Average (TWA) noise exposure of 102 dBA. The company policy is to use OSHA's standard formula for estimating workplace protection. If a worker uses earplugs with a Noise Reduction Rating (NRR) of 33, what is the estimated exposure in dBA under the protector?

76 dBA (Correct answer)
70 dBA
69 dBA
84 dBA

Correct answer: 76 dBA

OSHA's formula for estimating the protected A-weighted TWA from an A-weighted measurement is to subtract 7 from the NRR, and then subtract the result from the measured TWA. Calculation: NRR 33 - 7 = 26. Then, 102 dBA - 26 = 76 dBA. This estimated exposure is below the OSHA Permissible Exposure Limit (PEL) of 90 dBA and the action level of 85 dBA.

Question 183: According to OSHA's Fall Protection standard (29 CFR 1926.501), at what height must fall protection be provided for workers on walking/working surfaces with unprotected sides or edges in construction?

10 feet
6 feet (Correct answer)
4 feet
15 feet

Correct answer: 6 feet

OSHA requires fall protection at 6 feet above a lower level for construction workers on walking/working surfaces.

Question 184: What is the PRIMARY benefit of integrating behavior-based safety (BBS) observations into a construction safety program?

It replaces the need for formal safety inspections
It transfers safety responsibility from management to workers
It reduces the amount of required safety documentation
It identifies at-risk behaviors before they result in incidents (Correct answer)

Correct answer: It identifies at-risk behaviors before they result in incidents

BBS observations focus on identifying and correcting at-risk behaviors proactively, serving as a leading indicator that complements but does not replace formal inspections.

Question 185: A construction firm's safety program includes a written disciplinary policy for safety violations. What is the PRIMARY legal benefit of consistently enforcing this policy?

It satisfies ANSI Z10 certification requirements
It eliminates the employer's liability for employee injuries
It reduces workers' compensation premiums automatically
It supports an unpreventable employee misconduct (UEM) defense in OSHA proceedings (Correct answer)

Correct answer: It supports an unpreventable employee misconduct (UEM) defense in OSHA proceedings

Consistent enforcement of a written disciplinary policy is a key element of the unpreventable employee misconduct affirmative defense against OSHA citations.

Question 186: Which of the following types of PPE is best for shielding the eyes from dust in a construction environment?

Face shields
Welding goggles
Safety goggles (Correct answer)
Safety glasses

Correct answer: Safety goggles

Safety glasses don't offer as much protection from airborne eye threats such dust as goggles that seal with the forehead and temples. They can offer protection from projectiles that are launched into the air if they are approved for impact protection.

Question 187: A construction company wants to benchmark its safety program against industry standards. Which metric provides the MOST meaningful comparison?

Annual safety budget as a percentage of revenue
Number of safety committee meetings held
Days Away, Restricted, or Transferred (DART) rate (Correct answer)
Total number of safety training hours

Correct answer: Days Away, Restricted, or Transferred (DART) rate

The DART rate is a standardized OSHA metric that allows meaningful comparison across companies and industry sectors because it is calculated using a consistent formula.

Question 188: What is the maximum allowable noise exposure for an 8-hour workday under OSHA's construction noise standard?

90 dBA (Correct answer)
100 dBA
85 dBA
95 dBA

Correct answer: 90 dBA

OSHA's 29 CFR 1926.52 sets the permissible noise exposure at 90 dBA for an 8-hour time-weighted average in construction.

Question 189: Which component of a personal fall arrest system is designed to absorb energy and limit arresting forces on the body?

Anchorage connector
Vertical lifeline
Shock-absorbing lanyard (Correct answer)
Full-body harness

Correct answer: Shock-absorbing lanyard

A shock-absorbing lanyard deploys a deceleration device that spreads impact forces over time, reducing peak arresting force.

Question 190: Under OSHA's injury recordkeeping rule (29 CFR 1904), which criterion determines whether a work-related injury requires a days-away entry on the OSHA 300 Log?

One or more calendar days away from work beyond the day of injury (Correct answer)
Prescription medication provided by a licensed physician
Any injury requiring an emergency room visit
Medical treatment beyond first aid, regardless of days away

Correct answer: One or more calendar days away from work beyond the day of injury

OSHA defines a days-away case as one where a physician or licensed health care professional recommends one or more calendar days away from work.

Question 191: Under OSHA's respiratory protection standard (29 CFR 1910.134), what must be completed before a worker is assigned a respirator?

A written permit signed by the project manager
Completion of a 10-hour OSHA construction course
A written JHA and site safety plan review
Medical evaluation, fit testing, and training (Correct answer)

Correct answer: Medical evaluation, fit testing, and training

Before respirator use, OSHA requires a medical evaluation to confirm the worker can safely wear the respirator, followed by fit testing and training on its proper use.

Question 192: Which type of shoring uses steel plates driven into the ground before excavation begins to prevent soil movement?

Hydraulic shoring
Trench box (shield)
Timber shoring
Sheet piling (Correct answer)

Correct answer: Sheet piling

Sheet piling consists of interlocking steel sheets driven vertically into the ground prior to excavation to retain soil and groundwater.

Question 193: Which document formally records that a specific worker received, understood, and acknowledged safety training on a given topic and date?

Site-specific safety plan
OSHA Form 300 injury log
Training attendance and comprehension acknowledgment form (Correct answer)
Job Hazard Analysis (JHA)

Correct answer: Training attendance and comprehension acknowledgment form

A signed training acknowledgment form provides legal documentation that the worker received and comprehended the training.

Question 194: A safety technician is tasked with selecting a leading indicator to track daily. Which choice provides the MOST actionable real-time safety data?

Daily percentage of pre-task planning forms completed before work begins (Correct answer)
Quarterly workers' compensation experience modification rate (EMR)
Monthly lost-time injury frequency rate
Annual OSHA recordable incident rate

Correct answer: Daily percentage of pre-task planning forms completed before work begins

Daily pre-task planning completion rates are a leading indicator that directly measures whether workers are identifying hazards before starting work.

Question 195: What must be done before excavation begins when underground utilities may be present in the work area?

All work must be performed during daylight hours only
The contractor must contact utility companies or the local one-call system to locate utilities (Correct answer)
Workers must wear rubber-soled boots
A fence must be erected around the entire work zone

Correct answer: The contractor must contact utility companies or the local one-call system to locate utilities

Before any excavation, the contractor must contact utility companies or use the local one-call system (such as 811) to have underground utilities located and marked.

Question 196: During a group lockout procedure, each authorized employee must:

Share one group lockout device managed by the lead worker
Verbally confirm to the supervisor they are clear of the equipment
Sign a group sign-off sheet maintained by the safety officer
Apply their own personal lock to the group lockout hasp (Correct answer)

Correct answer: Apply their own personal lock to the group lockout hasp

In group LOTO, each authorized employee applies their own personal lock to a hasp so no one can restore energy until all workers have removed their locks.

Question 197: A worker is directing a crane operator near an active roadway. Which struck-by hazard control is considered the hierarchy's first priority?

Issue the worker a high-visibility vest and hard hat
Brief the worker on hand signal procedures
Establish a barricaded exclusion zone that eliminates worker exposure to the swing radius (Correct answer)
Reduce crane load weight to lower impact risk

Correct answer: Establish a barricaded exclusion zone that eliminates worker exposure to the swing radius

Elimination/substitution sits at the top of the hierarchy of controls. Establishing a physical exclusion zone removes workers from the hazard area entirely, which is more effective than PPE or administrative controls that rely on human behavior.

Question 198: What is the purpose of a Toolbox Talk (TBT) on a construction site?

To provide formal OSHA-required safety training certification
To review the project schedule and productivity goals
To discuss daily hazards and reinforce safe work practices with the crew (Correct answer)
To document near-miss incidents for OSHA recordkeeping

Correct answer: To discuss daily hazards and reinforce safe work practices with the crew

Toolbox Talks are brief, informal safety discussions held at the job site to address specific hazards workers will face that day and reinforce safe practices.

Question 199: How often must emergency action plans be reviewed with employees on a construction site per OSHA requirements?

Monthly
Quarterly
Only during initial hiring
Annually or when the plan changes (Correct answer)

Correct answer: Annually or when the plan changes

OSHA requires that emergency action plans be reviewed with each employee when the plan is initially developed and whenever the plan changes.

Question 200: When is a safety monitoring system (SMS) an acceptable sole means of fall protection on a low-slope roof?

Only on roofs with no penetrations
Whenever fewer than 10 workers are on the roof
Only for roofs 50 feet wide or less with a slope of 4:12 or less (Correct answer)
Any time a competent person is available

Correct answer: Only for roofs 50 feet wide or less with a slope of 4:12 or less

OSHA permits SMS as the sole fall protection method only on low-slope roofs 50 feet or less in width.

CHST (Construction Health and Safety Technician) Exam

The CHST (Construction Health and Safety Technician) Exam exam validates essential knowledge and skills required for certification or licensure in this field.

200

Questions

240 min

Time Limit

68%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds