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

Question 1: During demolition of a pre-1980 building, workers encounter pipe insulation suspected to contain asbestos. What is the FIRST action the CHST should take?

Wet the material and continue demolition
Install warning tape around the area and proceed cautiously
Immediately remove the insulation using standard PPE
Stop work in the affected area and arrange for sampling by a licensed asbestos inspector (Correct answer)

Correct answer: Stop work in the affected area and arrange for sampling by a licensed asbestos inspector

OSHA 29 CFR 1926.1101 requires that suspect asbestos-containing materials be assessed by a competent person before disturbance; work must stop until sampling confirms or rules out ACM.

Question 2: Which communication strategy is MOST appropriate for delivering a safety stand-down after a near-miss incident?

Hold a brief, focused toolbox talk at the work area with affected crews (Correct answer)
Send a company-wide memo summarizing the event
Schedule a formal classroom session for the following week
Post the incident report on the safety bulletin board

Correct answer: Hold a brief, focused toolbox talk at the work area with affected crews

A toolbox talk at the work area with affected crews provides immediate, relevant communication while the near-miss details are fresh and the hazard context is visible.

Question 3: Which OSHA standard requires employers to establish a written Hazard Communication Program on construction sites?

29 CFR 1926.59 (Correct answer)
29 CFR 1926.651
29 CFR 1926.451
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 4: Which of the following conditions would require reclassifying Type A soil to a lower classification?

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

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

Identify first aid measures for chemical exposure
Provide emergency response telephone numbers
List regulatory exposure limits and recommend appropriate PPE (Correct answer)
Describe physical and chemical properties of the substance

Correct answer: List regulatory exposure limits and recommend appropriate PPE

SDS Section 8 lists OELs (such as OSHA PELs and ACGIH TLVs) and specifies engineering controls and PPE required to minimize worker exposure.

Question 6: Which type of glove material provides the BEST protection against ketone solvents commonly found on construction sites?

Butyl rubber (Correct answer)
Polyvinyl chloride (PVC)
Natural rubber
Latex rubber

Correct answer: Butyl rubber

Butyl rubber gloves offer superior resistance to ketones and other polar solvents, outperforming latex, natural rubber, and PVC for these chemicals.

Question 7: Which OSHA standard specifically governs fall protection requirements in construction?

29 CFR 1910.132
29 CFR 1926.452
29 CFR 1926.502 (Correct answer)
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 8: 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?

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

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 9: A construction worker notices smoke coming from electrical conduit inside a wall cavity. Which type of fire extinguisher is appropriate?

Class B CO2 extinguisher
Class D dry powder extinguisher
Class C-rated extinguisher (Correct answer)
Class A water extinguisher

Correct answer: Class C-rated extinguisher

Electrical fires require a Class C-rated extinguisher because water-based agents conduct electricity and could endanger the user.

Question 10: What class of hard hat is required when workers are exposed to high-voltage electrical hazards exceeding 20,000 volts?

Class A — general industry
Class B — high voltage
Class E — electrical (Correct answer)
Class C — conductive

Correct answer: Class E — electrical

ANSI/ISEA Z89.1 Class E (Electrical) hard hats are tested to 20,000 volts and are required for exposures to high-voltage electrical hazards.

Question 11: A competent person must have which TWO characteristics according to OSHA's definition?

OSHA 30-hour certification and a PE license
First aid certification and supervisor status
Knowledge to identify existing and predictable hazards AND authority to take corrective action (Correct answer)
A college degree and 5 years of experience

Correct answer: Knowledge to identify existing and predictable hazards AND authority to take corrective action

OSHA defines a competent person as one who can identify hazardous conditions and has the authority to eliminate them promptly (29 CFR 1926.32(f)).

Question 12: What does the 'action level' represent in OSHA's chemical exposure standards, and what obligations does it trigger?

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

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 13: A safety technician is reviewing incident investigation reports and notices that 'inadequate training' is listed as a root cause in 60% of cases. Which corrective action addresses the root cause MOST directly?

Increase the frequency of random drug testing
Purchase additional PPE for high-risk tasks
Revise and expand the new-hire and task-specific training programs (Correct answer)
Issue written warnings to supervisors of injured employees

Correct answer: Revise and expand the new-hire and task-specific training programs

If inadequate training is the systemic root cause, revising training programs directly eliminates that causal factor.

Question 14: 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 plan prepared only for tower crane assembly and disassembly
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)

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 15: During a lockout/tagout procedure, who is authorized to remove a lock placed by another worker?

Only the worker who applied the lock, with limited exceptions under employer procedures (Correct answer)
The general contractor's safety manager
The site superintendent
Any qualified electrician on the crew

Correct answer: Only the worker who applied the lock, with limited exceptions under employer procedures

OSHA requires that only the employee who applied the lock may remove it, except under specific documented employer procedures when that worker is unavailable.

Question 16: Which document should be used to record that individual workers received and understood OSHA-required safety training?

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

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 17: Which condition would MOST likely warrant stopping work on a construction site?

An imminent danger condition is identified that cannot be immediately corrected (Correct answer)
A worker fails to wear safety glasses during a low-risk task
A subcontractor's toolbox talk ran five minutes short
A scheduled OSHA inspection is announced for the following day

Correct answer: An imminent danger condition is identified that cannot be immediately corrected

Imminent danger — conditions likely to cause death or serious physical harm — requires immediate work stoppage until the hazard is abated.

Question 18: What is the main advantage of using scenario-based simulations (e.g., tabletop exercises) in construction emergency response training?

They allow workers to practice decision-making in a risk-free environment before a real emergency (Correct answer)
They are faster to deliver than traditional classroom instruction
They satisfy all OSHA-required emergency drills for the year
They eliminate the need for written emergency action plans

Correct answer: They allow workers to practice decision-making in a risk-free environment before a real emergency

Simulation exercises build muscle memory and decision-making skills under simulated stress without real-life consequences of error.

Question 19: What is the purpose of a Toolbox Talk (TBT) on a construction site?

To review the project schedule and productivity goals
To discuss daily hazards and reinforce safe work practices with the crew (Correct answer)
To provide formal OSHA-required safety training certification
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 20: Which sign and symptom combination is the cardinal indicator that distinguishes heat stroke from heat exhaustion?

Muscle cramps in the legs and abdomen with normal temperature
Core body temperature between 100°F and 103°F with headache only
Core body temperature above 104°F combined with central nervous system dysfunction such as confusion, disorientation, or loss of consciousness (Correct answer)
Profuse sweating and pale, cool, moist skin

Correct answer: Core body temperature above 104°F combined with central nervous system dysfunction such as confusion, disorientation, or loss of consciousness

Heat stroke is a medical emergency defined by core body temperature above 104°F combined with CNS dysfunction including confusion, disorientation, slurred speech, or unconsciousness — requiring immediate cooling and emergency medical care.

Question 21: A CHST conducting a job hazard analysis (JHA) for concrete formwork discovers workers may be exposed to silica dust. Which OSHA standard primarily governs silica exposure in construction?

29 CFR 1926.55
29 CFR 1926.62
29 CFR 1926.1153 (Correct answer)
29 CFR 1926.200

Correct answer: 29 CFR 1926.1153

29 CFR 1926.1153 is OSHA's Respirable Crystalline Silica Standard for construction, establishing PELs and required controls.

Question 22: Which analysis tool uses a diagram shaped like a fish skeleton to identify multiple root causes of an incident?

Fault tree analysis
Job hazard analysis
5-Whys method
Ishikawa (fishbone) diagram (Correct answer)

Correct answer: Ishikawa (fishbone) diagram

The Ishikawa or fishbone diagram visually maps cause-and-effect relationships to identify multiple contributing factors to an incident.

Question 23: Which of the following scenarios would require an arc flash hazard analysis per NFPA 70E on a construction site?

Painting an electrical room wall
Inspecting a locked-out panel with the cover removed
Working on energized electrical equipment operating at 50 volts or more (Correct answer)
Replacing a light bulb in a de-energized fixture

Correct answer: Working on energized electrical equipment operating at 50 volts or more

NFPA 70E requires an arc flash risk assessment when workers may be exposed to energized electrical conductors or circuit parts operating at 50 volts or more.

Question 24: What is the primary health concern when construction workers are exposed to hydrogen sulfide (H2S) gas in sewer line excavation work?

Chronic liver damage
Permanent hearing loss
Olfactory fatigue leading to undetected lethal exposure (Correct answer)
Skin irritation and chemical burns

Correct answer: Olfactory fatigue leading to undetected lethal exposure

Hydrogen sulfide causes olfactory fatigue at higher concentrations, meaning workers lose the ability to smell the gas and may be unknowingly exposed to lethal levels.

Question 25: A CHST is establishing annual safety objectives for a multi-trade construction program. Which approach is MOST consistent with recognized occupational health and safety management system (OHSMS) principles such as ANSI/ASSP Z10 or ISO 45001?

Carry forward identical objectives from the previous year to maintain program consistency
Set objectives using the prior year's Total Recordable Incident Rate (TRIR) as the sole basis
Establish objectives that are measurable, time-bound, and directly address hazards identified through the planning process (Correct answer)
Limit objectives to high-hazard operations only to focus available resources

Correct answer: Establish objectives that are measurable, time-bound, and directly address hazards identified through the planning process

ANSI/ASSP Z10 and ISO 45001 both require that safety objectives be specific, measurable, achievable, relevant, and time-bound (SMART), and that they flow directly from hazard identification and risk assessment findings. Using only lagging indicators like TRIR or recycling prior objectives fails to drive proactive, risk-based improvement.

Question 26: Which adult learning principle states that workers learn best when they understand WHY a safety procedure matters before learning HOW to do it?

Relevance (WIIFM — What's in it for me) (Correct answer)
Reflection
Recency
Repetition

Correct answer: Relevance (WIIFM — What's in it for me)

Adults are motivated learners when content is relevant to their own goals and safety, making the 'why' critical before the 'how.'

Question 27: According to OSHA, what is the minimum safe distance a crane boom must maintain from energized power lines rated up to 350 kV?

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

Correct answer: 20 feet

OSHA 29 CFR 1926.1408 requires a minimum clearance of 20 feet from power lines rated up to 350 kV unless additional precautions are implemented.

Question 28: A propane torch used for roofing ignites a structural member. This fire is BEST classified as which type?

Class B only
Class A only
Class C
Class A and Class B combined (Correct answer)

Correct answer: Class A and Class B combined

If both the structural wood (Class A) and propane fuel (Class B) are burning, the fire involves two classes simultaneously.

Question 29: A construction company uses 'safety stand-downs' following a near-miss incident. What is the PRIMARY purpose of this practice?

To immediately communicate hazard lessons and reinforce safe behaviors across the workforce (Correct answer)
To demonstrate financial commitment to safety for insurance purposes
To comply with mandatory OSHA post-incident shutdown regulations
To allow management time to prepare legal documentation

Correct answer: To immediately communicate hazard lessons and reinforce safe behaviors across the workforce

Safety stand-downs pause work to share near-miss lessons and reinforce correct behaviors before anyone is injured.

Question 30: What is the primary purpose of the 'noise reduction rating' (NRR) labeled on hearing protection devices?

To indicate the device's frequency cutoff for low-frequency noise
To specify the maximum continuous exposure duration for the device
To allow employers to estimate the degree of noise attenuation in the field (Correct answer)
To certify the device for use in confined space noise environments only

Correct answer: To allow employers to estimate the degree of noise attenuation in the field

The NRR is an EPA-standardized laboratory rating used to estimate field attenuation. OSHA instructs employers to derate the NRR by 50% (for earmuffs) or up to 70% (for formable earplugs) to account for real-world fit variability, giving a realistic estimate of protected exposure.

Question 31: The GHS pictogram showing a skull and crossbones (☠) on a chemical label indicates:

The chemical is a serious eye irritant
The chemical is an environmental hazard
The chemical is a skin sensitizer
The chemical causes acute toxicity (fatal or toxic in small amounts) (Correct answer)

Correct answer: The chemical causes acute toxicity (fatal or toxic in small amounts)

The skull and crossbones GHS pictogram indicates acute toxicity categories 1–3, meaning the chemical can be fatal or toxic if inhaled, ingested, or absorbed through skin in small doses.

Question 32: When using a positioning device system, the maximum free-fall must be limited to how many feet?

18 inches
4 feet
2 feet (Correct answer)
6 feet

Correct answer: 2 feet

Positioning device systems must be rigged to prevent a free fall of more than 2 feet per OSHA 1926.502(e).

Question 33: What is the PRIMARY purpose of conducting a post-incident critique or after-action review immediately following a significant construction incident?

Assign disciplinary action to responsible workers
Calculate workers' compensation cost impact
Satisfy insurance carrier documentation requirements
Capture time-sensitive information and identify immediate corrective actions (Correct answer)

Correct answer: Capture time-sensitive information and identify immediate corrective actions

Post-incident critiques conducted quickly preserve fresh witness recollections and physical evidence, enabling prompt identification and implementation of corrective actions.

Question 34: Which OSHA standard governs the hazard communication program for construction worksites?

29 CFR 1926.59 (Correct answer)
29 CFR 1910.120
29 CFR 1926.21
29 CFR 1926.103

Correct answer: 29 CFR 1926.59

29 CFR 1926.59 is the OSHA Hazard Communication standard applicable to construction.

Question 35: 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 36: During a safety training needs assessment, a CHSTidentifies that lost-time injuries are concentrated in the fall hazard category. The MOST appropriate next step is to:

Immediately purchase new fall arrest equipment for all workers without further analysis
Suspend all work at height until an OSHA inspection is requested
Analyze which job tasks, crews, and locations are associated with the fall injuries to target training and controls (Correct answer)
Send a generic fall prevention email to the entire workforce

Correct answer: Analyze which job tasks, crews, and locations are associated with the fall injuries to target training and controls

A targeted root-cause analysis of fall incidents identifies specific gaps in training, equipment, or procedures that can be addressed with focused interventions.

Question 37: How should a tag line be used during a crane lift?

To measure the load radius during the lift
To replace a signal person when the operator has line of sight
To support part of the load weight
To control load rotation and swing without workers pulling against the crane (Correct answer)

Correct answer: To control load rotation and swing without workers pulling against the crane

Tag lines guide load orientation and prevent uncontrolled spinning or swinging; workers must never use them to bear load weight or fight the crane.

Question 38: What is the minimum rated compressive strength concrete must achieve before formwork and shoring can be removed?

The concrete must reach 3,000 psi regardless of design strength
Formwork may be removed 24 hours after pour completion
50% of 28-day design strength in all cases
Sufficient strength to support its own weight and construction loads, as determined by a qualified person (Correct answer)

Correct answer: Sufficient strength to support its own weight and construction loads, as determined by a qualified person

OSHA 1926.703(e) requires that formwork not be removed until the concrete has gained enough strength to support itself and any construction loads, as determined by a qualified person — typically via cylinder testing or maturity monitoring. There is no universal fixed time or single percentage threshold; it depends on mix design, curing conditions, and structural loading.

Question 39: What is the PRIMARY purpose of establishing a safety accountability system within a construction safety program?

To assign blame when incidents occur
To satisfy insurance company requirements
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 40: When developing a written safety program for a construction company, which element is MOST critical for ensuring frontline worker compliance and program effectiveness?

Posting the program prominently on all site bulletin boards
Incorporating meaningful worker participation during program development (Correct answer)
Obtaining senior management signatures on the final document
Distributing printed copies to every subcontractor on site

Correct answer: Incorporating meaningful worker participation during program development

Worker participation in developing the safety program increases ownership, buy-in, and compliance. Both ANSI/ASSP Z10 and OSHA's recommended practices identify worker participation as a foundational pillar—workers who help shape the rules are far more likely to follow them.

Question 41: According to OSHA's heat illness prevention standard, which environmental condition triggers mandatory acclimatization protocols for new workers?

Heat index above 91°F (33°C) (Correct answer)
Ambient temperature above 85°F (29°C)
Heat index above 80°F (27°C)
Wet bulb globe temperature above 78°F (26°C)

Correct answer: Heat index above 91°F (33°C)

OSHA guidance recommends acclimatization protocols when the heat index exceeds 91°F, with new workers limited to 20% of normal workload on day one.

Question 42: When using a hydraulic shoring system, what step must occur BEFORE workers enter the trench?

Install and extend all hydraulic cylinders to rated capacity (Correct answer)
Remove all surface water
Backfill the trench partially
Install a trench box over the shoring

Correct answer: Install and extend all hydraulic cylinders to rated capacity

Hydraulic cylinders must be installed and pressurized to their rated capacity before workers enter to ensure the system provides adequate lateral support.

Question 43: When is a stairway, ladder, or ramp required in an excavation?

Only when the excavation is deeper than 10 feet
When workers must enter an excavation 4 feet or more in depth (Correct answer)
Whenever heavy equipment is present
Only in Type C soil excavations

Correct answer: When workers must enter an excavation 4 feet or more in depth

OSHA 1926.651(c)(2) requires a means of egress (ladder, stairway, or ramp) for any excavation 4 feet or deeper.

Question 44: A worker is exposed to a noise level of 95 dBA for the entire 8-hour shift. According to OSHA's permissible exposure limit table, how long may a worker be exposed to 95 dBA before reaching the PEL?

4 hours (Correct answer)
8 hours
2 hours
6 hours

Correct answer: 4 hours

OSHA's noise PEL table specifies that 95 dBA is permissible for a maximum of 4 hours per workday.

Question 45: What is the maximum permissible noise exposure for a construction worker at 95 dBA without hearing protection under OSHA standards?

2 hours
1 hour
8 hours
4 hours (Correct answer)

Correct answer: 4 hours

OSHA 1926.52 allows a maximum of 4 hours of exposure at 95 dBA without engineering controls or hearing protection in construction.

Question 46: What is a Threshold Limit Value–Ceiling (TLV-C) as defined by ACGIH?

A concentration that should not be exceeded at any instant during the workday (Correct answer)
The highest exposure allowed over a 15-minute short-term period
The level below which no adverse health effects are expected over a lifetime
The maximum concentration a worker can be exposed to continuously for 8 hours

Correct answer: A concentration that should not be exceeded at any instant during the workday

A TLV-C is the concentration that should not be exceeded at any moment during the workday, regardless of exposure duration.

Question 47: A safety technician observes masons repeatedly bending at the waist to pick up bricks from ground-level pallets. The most effective ergonomic intervention is:

Raising the pallet to knuckle height using a pallet jack or adjustable scaffold (Correct answer)
Issuing the workers lumbar support belts
Training workers on proper lifting technique
Limiting each worker to lifting no more than 50 lbs per lift

Correct answer: Raising the pallet to knuckle height using a pallet jack or adjustable scaffold

Engineering controls — here, repositioning the work at knuckle height — eliminate the awkward posture at the source. Back belts (PPE) and training (administrative) are lower-order controls that do not change the physical demands of the task. Weight limits without posture correction still allow repetitive bending.

Question 48: Which scenario most accurately describes a 'fissured' soil condition that affects soil classification?

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

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 49: 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?

10% reduction
One-third (33%) reduction (Correct answer)
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 50: 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 51: A construction worker discovers a small trash fire in a dumpster near a structure. What should be the worker's FIRST action?

Attempt to extinguish it immediately with a nearby extinguisher
Evacuate the site completely without attempting suppression
Call the project manager to get approval to act
Activate the site alarm and notify others before attempting suppression (Correct answer)

Correct answer: Activate the site alarm and notify others before attempting suppression

Life safety takes priority—workers must alert others by activating the alarm before attempting any suppression efforts.

Question 52: Under OSHA 1926.416, what minimum clearance must be maintained from overhead energized power lines rated at 50 kV or below when using equipment on a construction site?

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

Correct answer: 10 feet

OSHA 1926.416(a)(1) and OSHA 1926.600 require a minimum clearance of 10 feet from any part of a tool, equipment, or machinery to overhead power lines rated at 50 kV or less.

Question 53: What is the primary purpose of a Job Hazard Analysis (JHA) in construction safety management?

To calculate workers' compensation premiums
To identify potential hazards associated with each step of a task and determine preventive measures (Correct answer)
To satisfy insurance audit requirements
To assign blame after an incident occurs

Correct answer: To identify potential hazards associated with each step of a task and determine preventive measures

A JHA systematically breaks down a job into steps to identify hazards and establish controls before work begins.

Question 54: 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 55: Which factor does NOT affect the total fall clearance distance calculation for a worker using a PFAS with a 6-foot lanyard?

Harness stretch
Worker's height
Deceleration distance
Manufacturer's rated capacity (Correct answer)

Correct answer: Manufacturer's rated capacity

Clearance distance accounts for lanyard length, deceleration distance, harness stretch, and worker height — not the harness's weight rating.

Question 56: Which adult learning principle suggests that construction safety training is most effective when it uses real job-site examples rather than abstract theory?

Pedagogy — structured lecture is the most efficient delivery method
Cognitivism — complex diagrams improve memory encoding
Andragogy — adults learn best through experience-based relevance (Correct answer)
Behaviorism — repetition alone drives retention

Correct answer: Andragogy — adults learn best through experience-based relevance

Andragogy principles hold that adult learners are most engaged when training is immediately applicable to their real-world work situations.

Question 57: A wire rope used for rigging shows more than __ broken wires in one lay length and must be removed from service.

10
2
4
6 (Correct answer)

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 58: A GFCI trips repeatedly when a power tool is plugged in on a construction site. What is the safest immediate action?

Reset the GFCI and continue using the tool
Remove the tool from service and have it inspected/repaired (Correct answer)
Increase the circuit breaker amperage to prevent future trips
Bypass the GFCI with an extension cord to a standard outlet

Correct answer: Remove the tool from service and have it inspected/repaired

Repeated GFCI tripping indicates a ground fault in the tool; it must be removed from service and inspected by a qualified person before further use.

Question 59: 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:

The crane tension is released and the tag line is removed
The plank has been in position for at least 30 minutes
It has been secured to prevent movement and a competent person has determined it is stable (Correct answer)
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 60: What is the maximum allowable load per scaffold plank for a light-duty scaffold?

50 pounds per square foot
10 pounds per square foot
75 pounds per square foot
25 pounds per square foot (Correct answer)

Correct answer: 25 pounds per square foot

OSHA defines light-duty scaffolds as those designed to carry a maximum of 25 pounds per square foot.

Question 61: Which of the following BEST describes the primary purpose of a construction safety program audit or evaluation?

To provide a structured format for training newly promoted site supervisors
To generate documentation required for OSHA recordkeeping compliance
To satisfy the annual review requirements of the company's insurance carrier
To identify gaps between written program requirements and actual field practices (Correct answer)

Correct answer: To identify gaps between written program requirements and actual field practices

A safety program audit systematically compares what the program requires with what is actually happening on the site. Closing that gap drives continuous improvement. While audits may support insurance or compliance needs, those are secondary outcomes—gap identification and corrective action are the core purpose.

Question 62: A construction electrician is working on a 480V motor control center. After locking out the breaker, what is the next critical step before touching conductors?

Notify the building owner that power is off
Test for absence of voltage using an appropriate voltage tester (Correct answer)
Apply insulating blankets over the breaker panel
Wait 30 minutes for residual current to dissipate

Correct answer: Test for absence of voltage using an appropriate voltage tester

After lockout, workers must verify zero energy state by testing with a voltmeter or tick tracer rated for the voltage before touching any conductors.

Question 63: The distance between landing platforms on a fixed ladder using a cage or well with several ladder sections shall be __________, in accordance with OSHA regulation 29 CFR 1926.1053.

no greater than 24 feet
no greater than 36 feet
no greater than 30 feet
no greater than 50 feet (Correct answer)

Correct answer: no greater than 50 feet

A fixed ladder using a cage or well with numerous ladder sections is required to provide landing platforms at a maximum distance of 50 feet, according to OSHA regulation 29 CFR 1926.1053(a)(19)(iii).

Question 64: Which OSHA standard governs the use of aerial lifts in construction?

29 CFR 1926.550
29 CFR 1926.452
29 CFR 1926.453 (Correct answer)
29 CFR 1926.502

Correct answer: 29 CFR 1926.453

Aerial lifts used in construction are governed by OSHA 29 CFR 1926.453.

Question 65: Under OSHA 1926.650, what is the definition of an 'excavation'?

Only cuts in the ground deeper than 4 feet
Any man-made cut, cavity, trench, or depression in the earth's surface formed by earth removal (Correct answer)
Any underground work area where workers are present
A trench that is at least as wide as it is deep

Correct answer: Any man-made cut, cavity, trench, or depression in the earth's surface formed by earth removal

OSHA 1926.650 defines an excavation as any man-made cut, cavity, trench, or depression in the earth's surface formed by earth removal, regardless of depth.

Question 66: A construction company's Experience Modification Rate (EMR) increases from 0.85 to 1.15. What is the MOST likely direct business impact?

The company must immediately retrain all supervisors
The company loses its OSHA VPP Star status automatically
Bid competitiveness decreases because project owners often screen out EMRs above 1.0 (Correct answer)
OSHA issues a hazard alert letter to the company

Correct answer: Bid competitiveness decreases because project owners often screen out EMRs above 1.0

Many owners and general contractors use EMR thresholds (commonly 1.0) as a prequalification filter, so a rising EMR can disqualify a firm from bidding on projects.

Question 67: A safety net system must be installed no more than how far below the working surface it protects?

25 feet (Correct answer)
20 feet
10 feet
30 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 68: 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:

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

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 69: What does the term 'Working Load Limit' (WLL) mean for rigging hardware?

The load at which proof testing is conducted
The ultimate breaking strength of the rigging component
The load at which rigging hardware will permanently deform
The manufacturer-rated maximum load that rigging hardware is designed to handle in regular service (Correct answer)

Correct answer: The manufacturer-rated maximum load that rigging hardware is designed to handle in regular service

Working Load Limit (WLL) is the manufacturer-rated maximum load that a piece of rigging hardware can safely handle in regular service — it already incorporates a design safety factor.

Question 70: Under OSHA 29 CFR 1926.151, temporary heating equipment on a construction site must be positioned at a minimum distance from combustible materials of:

12 inches
As specified by the manufacturer's instructions (Correct answer)
24 inches
36 inches

Correct answer: As specified by the manufacturer's instructions

OSHA 1926.151 requires temporary heating equipment to be used per the manufacturer's instructions, which specify the minimum clearance from combustibles.

Question 71: During a confined space rescue, a would-be rescuer enters without proper equipment and is overcome by the same hazard as the original victim. This is known as:

Secondary exposure incident
Multi-victim entrapment
Cascade rescue failure (Correct answer)
Non-entry rescue failure

Correct answer: Cascade rescue failure

A cascade rescue failure (also called a multiple-casualty incident) occurs when untrained rescuers enter a permit space and become victims themselves.

Question 72: During a confined space entry, the attendant's PRIMARY duty is to:

Operate rescue equipment inside the space
Monitor entrants and maintain continuous communication (Correct answer)
Assist entrants with tools as needed
Perform atmospheric testing inside the permit space

Correct answer: Monitor entrants and maintain continuous communication

The attendant must maintain continuous communication with entrants and be ready to initiate rescue, not enter the space.

Question 73: Which class of fire involves energized electrical equipment?

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

Correct answer: Class C

Class C fires involve energized electrical equipment, and using water on them can cause electrocution.

Question 74: Which safety principle does the phrase 'Heinrich's Triangle' (or Safety Triangle) represent?

The three levels of PPE hierarchy from primary to tertiary protection
The relationship between frequency, severity, and probability in risk assessment
For every fatality there are a predictable number of minor injuries and near-misses at lower levels (Correct answer)
The three parties responsible for safety: employer, employee, and regulator

Correct answer: For every fatality there are a predictable number of minor injuries and near-misses at lower levels

Heinrich's Triangle illustrates that for each serious injury there are many minor injuries and an even greater number of near-misses, suggesting near-miss control prevents major injuries.

Question 75: When using the 5 Whys technique during a construction incident investigation, what indicates that the root cause has been reached?

When the answer points to a process or system failure that can be corrected (Correct answer)
When exactly five questions have been asked
When a worker's unsafe act is identified
When the investigator runs out of questions to ask

Correct answer: When the answer points to a process or system failure that can be corrected

The root cause is reached when the answer identifies a process or system failure that management can address with corrective actions, regardless of how many questions were asked.

Question 76: Which document serves as the primary written safety plan that outlines a contractor's overall approach to managing safety on a specific project?

Hazardous Waste Operations Plan
Incident Command System (ICS) plan
Site-Specific Safety Plan (SSSP) (Correct answer)
Emergency Action Plan (EAP)

Correct answer: Site-Specific Safety Plan (SSSP)

A Site-Specific Safety Plan (SSSP) documents the contractor's safety policies, procedures, and hazard controls tailored to the unique conditions of a specific construction project.

Question 77: During a construction site emergency evacuation, who is responsible for conducting a headcount at the designated assembly area?

The designated emergency warden or supervisor (Correct answer)
Local fire department
OSHA inspector
The site owner

Correct answer: The designated emergency warden or supervisor

Designated emergency wardens or supervisors are assigned the responsibility of accounting for all workers at the assembly point after an evacuation.

Question 78: 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
A qualified lift director must be designated and each crane's load share must be calculated (Correct answer)
The combined rated capacity equals the sum of both cranes' maximum capacities

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

16 sections (Correct answer)
8 sections
12 sections
20 sections

Correct answer: 16 sections

GHS-aligned SDS documents must contain exactly 16 standardized sections covering hazard identification, composition, first aid, handling, and more.

Question 80: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), which energy control procedure requires the use of a lock to secure the energy isolation device?

Blockout
Tagout
Zero energy state
Lockout (Correct answer)

Correct answer: Lockout

Lockout uses a physical lock placed on an energy isolation device to prevent re-energization, which is more secure than tagout alone.

Question 81: Under OSHA 1926.150(c), what minimum extinguisher rating is required for Class A (ordinary combustible) fire hazards on construction sites?

2-A (Correct answer)
10-B:C
1-A
4-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 82: When creating training materials for low-literacy construction workers, which instructional design strategy is MOST effective?

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

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 83: Skylights and roof openings must be guarded when they present a fall hazard. What is the minimum guardrail height required around such openings under OSHA 1926.502?

42 inches (Correct answer)
36 inches
48 inches
39 inches

Correct answer: 42 inches

OSHA 1926.502(b) requires guardrail systems to be 42 inches (plus or minus 3 inches) in height.

Question 84: 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 is exempt from OSHA inspections
The company has 35% fewer injuries than average
The company's workers' comp costs are 35% above industry average (Correct answer)
The company qualifies for safety incentive bonuses

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 85: According to ANSI/ISEA Z89.1, which hard hat class provides the highest level of electrical protection?

Class C (Conductive)
Class G (General)
Class H (High-voltage)
Class E (Electrical) (Correct answer)

Correct answer: Class E (Electrical)

Class E hard hats are tested to 20,000 volts and provide the highest level of electrical protection under ANSI/ISEA Z89.1.

Question 86: What does the acronym 'PDCA' stand for in the context of safety management systems?

Plan, Design, Control, Audit
Plan, Do, Check, Act (Correct answer)
Process, Document, Correct, Archive
Prepare, Deploy, Confirm, Assess

Correct answer: Plan, Do, Check, Act

PDCA (Plan, Do, Check, Act) is the continuous improvement cycle foundational to safety management systems like ANSI/ASSP Z10.

Question 87: OSHA requires masonry walls over what height to have adequate bracing to prevent overturning during construction?

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

Correct answer: 10 feet

OSHA 29 CFR 1926.706(b) requires that masonry walls over 8 feet in height be adequately braced to prevent overturning and collapse until permanent supporting elements are in place. The 8-foot threshold triggers the mandatory bracing requirement.

Question 88: Which of the following is the BEST practice for writing corrective actions in an incident investigation report?

Assign each action to a specific person with a target completion date (Correct answer)
Recommend disciplinary action as the primary corrective measure
Use general language to allow flexibility in implementation
Focus corrective actions only on the worker involved in the incident

Correct answer: Assign each action to a specific person with a target completion date

Effective corrective actions must be specific, assigned to a responsible individual, and include a target completion date to ensure accountability and timely implementation.

Question 89: What is the purpose of a crane anti-two-block device?

It automatically levels the crane on uneven ground
It prevents the load block from contacting the boom tip (Correct answer)
It monitors wire rope tension
It limits swing speed in high winds

Correct answer: It prevents the load block from contacting the boom tip

An anti-two-block (ATB) device stops the hoist when the load block gets too close to the sheave block, preventing catastrophic wire rope failure.

Question 90: Which of the following is the primary purpose of conducting an incident investigation on a construction site?

To determine the financial impact of the incident on the project's budget.
To complete regulatory paperwork for OSHA and the company's insurer.
To assign blame and discipline responsible employees.
To identify root causes and implement corrective actions to prevent recurrence. (Correct answer)

Correct answer: To identify root causes and implement corrective actions to prevent recurrence.

The fundamental goal of an incident investigation is to determine the underlying or root causes to prevent similar incidents from happening in the future. While completing paperwork is a requirement and financial impacts are a concern, the core purpose is prevention, not placing blame, which can discourage reporting and hinder the discovery of systemic safety issues.

Question 91: 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 1904.14 — Recording criteria for cases involving medical removal
29 CFR 1926.20 — General safety and health provisions
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 92: A construction worker discovers a frayed extension cord on a jobsite. What is the most appropriate immediate action?

Reduce the load on the cord by unplugging one tool
Wrap the damaged area with electrical tape and continue use
Remove the cord from service and tag it out of service (Correct answer)
Notify OSHA before taking any action

Correct answer: Remove the cord from service and tag it out of service

Damaged extension cords must be immediately removed from service and tagged to prevent use until repaired or replaced.

Question 93: Which of the following is NOT an OSHA-required form under 29 CFR 1904 for recording work-related injuries and illnesses?

OSHA Form 300 — Log of Work-Related Injuries and Illnesses
OSHA Form 300A — Summary of Work-Related Injuries and Illnesses
OSHA Form 302 — Worker Medical History (Correct answer)
OSHA Form 301 — Injury and Illness Incident Report

Correct answer: OSHA Form 302 — Worker Medical History

OSHA requires Forms 300 (Log), 300A (Annual Summary), and 301 (Incident Report). There is no OSHA Form 302 — Worker Medical History.

Question 94: A construction company wants to benchmark its safety performance against industry peers. Which data source provides the most standardized comparison?

BLS Survey of Occupational Injuries and Illnesses by NAICS code (Correct answer)
Insurance carrier loss runs
OSHA 300 logs shared voluntarily by peers
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 95: 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 eliminates the employer's liability for employee injuries
It satisfies ANSI Z10 certification requirements
It supports an unpreventable employee misconduct (UEM) defense in OSHA proceedings (Correct answer)
It reduces workers' compensation premiums automatically

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 96: Under OSHA 29 CFR 1926.502, what is the maximum free-fall distance allowed when using a personal fall arrest system (PFAS)?

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

Correct answer: 6 feet

OSHA limits free-fall distance to 6 feet when using a personal fall arrest system.

Question 97: When using a safety net system, what is the maximum distance the net can be placed below the working surface?

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

Correct answer: 30 feet

OSHA 1926.502(c)(1) states safety nets shall be installed no more than 30 feet below the walking/working surface.

Question 98: To make sure they are providing the necessary protection against electrical shock, how frequently must electrical insulating gloves be tested?

Biweekly
As deemed appropriate by visual inspection
Annually
Every six months (Correct answer)

Correct answer: Every six months

Electrical insulating gloves must undergo testing every six months in accordance with 29 CFR 1926.97.

Question 99: A competent person inspects a scaffold and finds a plank with a split running along the grain for 18 inches. What is the correct action?

Remove and replace the plank immediately (Correct answer)
Reinforce with a steel clamp and continue use
Flip the plank over and continue use
Mark the plank and monitor it daily

Correct answer: Remove and replace the plank immediately

Any scaffold plank with visible defects such as splits compromising structural integrity must be immediately removed from service.

Question 100: A company introduces a new type of mobile scaffolding that its workers have never used before. Which of the following actions is required by OSHA regarding employee training?

Allow only the most experienced employee to use the new scaffold, with others observing.
Assume previous general scaffold training is sufficient for the new equipment.
Distribute the manufacturer's manual and require employees to sign a form saying they read it.
Provide retraining to employees to address the hazards and operating procedures of the new equipment. (Correct answer)

Correct answer: Provide retraining to employees to address the hazards and operating procedures of the new equipment.

OSHA requires employers to provide retraining when new hazards or equipment are introduced into the workplace. A new type of scaffolding presents different risks and requires specific instruction to ensure workers are competent in its safe use.

Question 101: On a multi-employer construction site, who bears primary responsibility for ensuring emergency telephone numbers are posted?

OSHA's area office
Each individual subcontractor independently
The local municipality
The controlling employer or general contractor (Correct answer)

Correct answer: The controlling employer or general contractor

The general contractor (controlling employer) is responsible for overall site safety coordination, including posting emergency contact numbers prominently.

Question 102: Which of the following BEST describes the difference between an incident and an accident in safety management?

They are interchangeable terms with no meaningful distinction
An incident requires OSHA reporting while an accident does not
An accident is more severe than an incident
An incident is any unplanned event that could have or did cause harm; an accident implies randomness and is considered outdated (Correct answer)

Correct answer: An incident is any unplanned event that could have or did cause harm; an accident implies randomness and is considered outdated

Modern safety management uses 'incident' to emphasize that unplanned events have identifiable causes, replacing 'accident' which incorrectly implies random, unpreventable events.

Question 103: What does the acronym PASS stand for when using a portable fire extinguisher?

Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep side to side (Correct answer)
Pull pin, Apply pressure, Stand back, Spray at the top
Point at the flames, Aim high, Squeeze trigger, Spray continuously
Press handle, Aim at center, Squeeze trigger, Sweep upward

Correct answer: Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep side to side

PASS stands for Pull the pin, Aim the nozzle at the base of the fire (not the flames), Squeeze the handle to discharge the agent, and Sweep the nozzle side to side at the base of the fire.

Question 104: Which of the following best describes a 'caught-in/between' fatality mechanism?

A worker electrocuted by a live conductor
A worker struck by a nail gun discharge from 20 feet away
A worker falling from an unguarded floor opening
A worker's hand compressed between a rotating auger and a fixed guard (Correct answer)

Correct answer: A worker's hand compressed between a rotating auger and a fixed guard

Caught-in/between hazards occur when a body part is caught, compressed, or crushed between objects. A rotating auger and a fixed surface is a classic caught-in/between scenario. The other options describe struck-by, fall, and electrocution hazards respectively.

Question 105: When working with lead-based paint removal on a construction project, which type of PPE combination is most appropriate?

Dust mask and cotton work gloves
Half-face respirator with P100 filters, disposable coveralls, and nitrile gloves (Correct answer)
Safety glasses and leather gloves
Hard hat and steel-toe boots only

Correct answer: Half-face respirator with P100 filters, disposable coveralls, and nitrile gloves

Lead paint removal requires a half-face respirator with P100 filters to prevent inhalation, disposable coveralls to prevent skin contamination, and nitrile gloves for hand protection.

Question 106: Which of the following is NOT an acceptable method of worker egress from a trench that is 4 feet or more in depth?

Steps built into the side of the excavation
Ladder placed within 25 feet of workers
Structural ramp designed by a competent person
Being lifted out by a backhoe bucket (Correct answer)

Correct answer: Being lifted out by a backhoe bucket

Using a backhoe bucket to lift workers out of a trench is never an acceptable means of egress and violates OSHA safety standards.

Question 107: Which of the following is a key requirement for storing excavated soil and other materials relative to the trench?

They must be hauled off-site by the end of each shift.
They can be placed at the edge if a barricade is used.
They must be stored uphill from the excavation.
They must be placed at least 2 feet from the edge. (Correct answer)

Correct answer: They must be placed at least 2 feet from the edge.

OSHA standard 1926.651(j)(2) requires that employees be protected from excavated or other materials or equipment that could pose a hazard by falling or rolling into excavations. Protection shall be provided by placing and keeping such materials or equipment at least 2 feet from the edge of the excavation.

Question 108: A construction company wants to improve near-miss reporting. Which strategy has been shown to be MOST effective?

Establishing a non-punitive, anonymous reporting system with feedback to reporters (Correct answer)
Disciplining workers who fail to report near-misses immediately
Requiring supervisors to investigate and keep findings confidential from workers
Limiting reports to incidents that caused at least minor injury

Correct answer: Establishing a non-punitive, anonymous reporting system with feedback to reporters

Non-punitive, confidential systems remove fear of blame, which is the primary barrier to near-miss reporting.

Question 109: What information is NOT required on an OSHA-compliant confined space entry permit?

Authorized entrants and the entry supervisor
The employer's general liability insurance policy number (Correct answer)
The hazards of the permit space and measures to eliminate or control them
Acceptable entry conditions and atmospheric test results

Correct answer: The employer's general liability insurance policy number

Entry permits must contain safety and operational information including space identification, hazards, atmospheric test results, authorized personnel, and emergency procedures—not financial or insurance data.

Question 110: When performing a pre-shift inspection, which wire rope condition requires immediate removal from service?

A kink in the rope (Correct answer)
Minor dirt accumulation
Slight surface rust on outer wires
Light surface fraying on the outer cover

Correct answer: A kink in the rope

A kink permanently damages the rope's internal structure and load distribution, making it an immediate rejection criterion per ASME B30.9.

Question 111: What is the purpose of an 'equipment-specific' LOTO procedure as opposed to a general LOTO procedure?

To satisfy recordkeeping requirements only
To provide step-by-step instructions tailored to a specific machine's energy sources and isolation points (Correct answer)
To allow faster lockout without verifying zero energy
To authorize less-trained workers to perform lockout

Correct answer: To provide step-by-step instructions tailored to a specific machine's energy sources and isolation points

Equipment-specific procedures document each energy source location, isolation method, and verification step unique to that machine, reducing human error during LOTO execution.

Question 112: 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)
The total cost of delivering training to all workers
Which OSHA standards apply to the specific project type
How many training hours are required by the general industry standard

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 113: A competent person inspects a personal fall arrest system after an employee experiences a fall. What action is required?

The system may be reused after visual inspection
The system needs re-inspection within 30 days
The system must be removed from service immediately (Correct answer)
The system can be reused if the lanyard shows no visible damage

Correct answer: The system must be removed from service immediately

OSHA 1926.502(d)(21) requires that fall arrest equipment subjected to impact loading be immediately removed from service.

Question 114: According to OSHA's Lockout/Tagout standard (29 CFR 1910.147), which of the following is true regarding tagout devices compared to lockout devices?

Tagout is the preferred method when working on electrical systems
Tagout may be used only when the energy isolating device is not capable of being locked out (Correct answer)
Tagout provides equivalent protection to lockout in all situations
Tagout devices must be removed by the same employee who attached them, with no exceptions

Correct answer: Tagout may be used only when the energy isolating device is not capable of being locked out

Under OSHA's LOTO standard, tagout is permitted only when the energy isolating device is not capable of being locked out. Lockout is the preferred method because it physically prevents re-energization, while a tagout is only a warning device.

Question 115: What does the term 'zero energy state' mean in the context of lockout/tagout?

All stored and residual energy has been relieved, disconnected, or restrained so the equipment cannot operate (Correct answer)
The circuit breaker is in the off position but not locked
The equipment is running at its lowest power setting
The equipment has been unplugged but capacitors may still hold a charge

Correct answer: All stored and residual energy has been relieved, disconnected, or restrained so the equipment cannot operate

Zero energy state means all forms of hazardous energy have been controlled so the equipment cannot unexpectedly start or release energy during servicing.

Question 116: What is the minimum bearing capacity required for mudsills placed under scaffold base plates on soft soil?

Sufficient to support scaffold loads without settling (Correct answer)
Sufficient to support 4 times the maximum intended load
Exactly 500 pounds per square foot
Exactly 2,000 pounds per square foot

Correct answer: Sufficient to support scaffold loads without settling

OSHA requires mudsills and base plates to be capable of supporting the scaffold without settling or displacement, with no specific numerical value mandated.

Question 117: 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 118: Which section of the SDS contains information about safe storage requirements for a chemical?

Section 7 (Correct answer)
Section 13
Section 5
Section 10

Correct answer: Section 7

Section 7 of the standardized 16-section SDS covers handling and storage requirements for the chemical.

Question 119: What is the required minimum clearance between a crane and an energized power line rated between 50 kV and 200 kV under OSHA 1926.1408?

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

Correct answer: 15 feet

For power lines rated over 50 kV up to 200 kV, OSHA 1926.1408 Table A requires a minimum clearance of 15 feet between any part of the crane (including load line and load) and the energized line.

Question 120: What type of glove material provides the best chemical resistance when handling epoxy-based coatings on a construction site?

Cotton liner gloves
Leather work gloves
Nitrile gloves (Correct answer)
Latex gloves

Correct answer: Nitrile gloves

Nitrile gloves offer superior resistance to a broad range of chemicals including epoxies, solvents, and oils, making them the preferred choice for chemical handling on construction sites.

Question 121: A construction worker is tasked with dry cutting concrete block with a handheld power saw for a full 8-hour shift. According to OSHA's silica standard for construction (29 CFR 1926.1153), which of the following represents the most effective and compliant method for controlling the respirable crystalline silica hazard?

Providing the worker with a half-mask respirator with an APF of 10.
Using a saw equipped with an integrated water delivery system. (Correct answer)
Restricting access to the work area and using a fan for ventilation.
Implementing job rotation to limit each worker's cutting time to two hours.

Correct answer: Using a saw equipped with an integrated water delivery system.

The most effective control measure listed is using a saw with an integrated water delivery system. This is an engineering control that prevents the silica dust from becoming airborne at the source. While respirators are a form of PPE, the hierarchy of controls prioritizes engineering controls over PPE. Administrative controls like restricting access or job rotation are also less effective than engineering controls.

Question 122: Under the GHS-format SDS, which section contains exposure controls and personal protective equipment requirements?

Section 11 — Toxicological Information
Section 2 — Hazard Identification
Section 4 — First-Aid Measures
Section 8 — Exposure Controls/Personal Protection (Correct answer)

Correct answer: Section 8 — Exposure Controls/Personal Protection

Section 8 of the GHS-format SDS covers Exposure Controls and Personal Protection, including OSHA PELs, ACGIH TLVs, engineering controls, and specific PPE recommendations for each exposure route.

Question 123: Under OSHA's Respiratory Protection Standard (29 CFR 1910.134), which type of respirator provides the highest level of protection?

Supplied-air respirator (SAR)
Full-face air-purifying respirator
Self-Contained Breathing Apparatus (SCBA) (Correct answer)
Half-face air-purifying respirator

Correct answer: Self-Contained Breathing Apparatus (SCBA)

An SCBA provides the highest protection because it supplies its own air source, offering complete independence from the ambient atmosphere and full facial coverage.

Question 124: What is the most significant health risk associated with welding galvanized steel without proper respiratory protection?

Metal fume fever from zinc oxide fumes (Correct answer)
Lead poisoning
Carbon monoxide poisoning
Asbestosis

Correct answer: Metal fume fever from zinc oxide fumes

Welding galvanized steel releases zinc oxide fumes that can cause metal fume fever, characterized by flu-like symptoms including chills, fever, and muscle aches.

Question 125: Under OSHA 1910.134, which type of respirator is required when entering an Immediately Dangerous to Life or Health (IDLH) atmosphere?

Self-Contained Breathing Apparatus (SCBA) operated in pressure-demand mode, or a supplied-air respirator with escape SCBA (Correct answer)
A full-face air-purifying respirator with combination cartridges
A PAPR with high-efficiency filters
Any respirator with an APF of at least 50

Correct answer: Self-Contained Breathing Apparatus (SCBA) operated in pressure-demand mode, or a supplied-air respirator with escape SCBA

OSHA 1910.134(d)(2)(i)(A) requires that workers entering IDLH atmospheres use a full-facepiece pressure-demand SCBA certified by NIOSH, or a combination full-facepiece pressure-demand supplied-air respirator with auxiliary self-contained air supply.

Question 126: Which type of fire extinguisher is most appropriate for a construction site electrical panel fire?

Class A water extinguisher
Class B foam extinguisher
Class C or ABC dry chemical extinguisher (Correct answer)
Class D metal extinguisher

Correct answer: Class C or ABC dry chemical extinguisher

Class C extinguishers are rated for energized electrical equipment, and ABC dry chemical units cover electrical fires along with ordinary combustibles and flammable liquids.

Question 127: A toolbox talk is BEST described as which type of safety communication?

A comprehensive annual safety training session required by OSHA
A short, informal job-site meeting addressing a specific hazard relevant to current work (Correct answer)
A formal classroom lecture delivered by a certified trainer
A written incident investigation report shared with the crew

Correct answer: A short, informal job-site meeting addressing a specific hazard relevant to current work

Toolbox talks are brief, targeted discussions held at the work site focused on immediate or upcoming hazards.

Question 128: What is the Total Recordable Incident Rate (TRIR) formula, and what does a TRIR of 3.0 mean?

TRIR = Recordable injuries ÷ Total employees; a TRIR of 3.0 means 3 injuries per employee per year
TRIR = Lost time injuries × 200; a TRIR of 3.0 means 3 lost-time injuries per 200 workers
TRIR = (Number of recordable incidents × 200,000) ÷ Total hours worked; a TRIR of 3.0 means 3 recordable incidents per 100 full-time equivalent workers per year (Correct answer)
TRIR = Total incidents × 1,000 hours; a TRIR of 3.0 means 3 injuries per 1,000 hours

Correct answer: TRIR = (Number of recordable incidents × 200,000) ÷ Total hours worked; a TRIR of 3.0 means 3 recordable incidents per 100 full-time equivalent workers per year

TRIR uses the 200,000-hour base (representing 100 employees working 2,000 hours per year). A TRIR of 3.0 means 3 recordable incidents occurred per 100 full-time equivalent workers during the measurement period.

Question 129: An electrical arc flash incident on a construction site results in second-degree burns to a worker wearing standard work clothes. Which NFPA 70E concept was most likely neglected?

Lockout/tagout verification
Arc flash hazard analysis and appropriate arc-rated PPE selection (Correct answer)
Equipment labeling requirements
Ground fault circuit interrupter testing

Correct answer: Arc flash hazard analysis and appropriate arc-rated PPE selection

Arc-rated PPE matched to the incident energy level from a site-specific arc flash hazard analysis would have reduced burn severity even when arc flash occurs.

Question 130: Under 29 CFR 1926.503, employers must verify that each worker who works at heights has been trained by providing which documentation?

A copy of the worker's prior employer's fall protection training record
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)

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

Ten (10) years
Until the chemical is no longer used by the company
Thirty (30) years (Correct answer)
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 132: During confined-space entry on a construction site, the atmosphere tests at 19.0% oxygen. How should this be classified?

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

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 133: Under OSHA regulations, when must construction workers receive additional safety training on a specific hazard?

Only during initial orientation
Annually regardless of changes
Only after an incident occurs
When new hazards are introduced or job conditions change (Correct answer)

Correct answer: When new hazards are introduced or job conditions change

OSHA requires additional training whenever new hazards are introduced, equipment changes, or job conditions are modified that affect worker safety.

Question 134: Which hierarchy of controls is MOST preferred when addressing a fall hazard on a construction site?

Safety monitoring systems
Administrative controls such as warning lines
Elimination or substitution of the hazard (Correct answer)
Personal fall arrest systems

Correct answer: Elimination or substitution of the hazard

The hierarchy of controls places elimination or substitution at the top, meaning redesigning the work to remove the fall hazard is always preferable.

Question 135: Which approach best describes the 'hierarchy of controls' when applied to a caught-in/caught-between hazard on a construction site?

Provide hard hats, then train workers on awareness
Conduct daily toolbox talks and document attendance
Eliminate the hazard first; if not feasible, guard or isolate it before relying on PPE (Correct answer)
Post warning signs first, then require PPE as a backup

Correct answer: Eliminate the hazard first; if not feasible, guard or isolate it before relying on PPE

The hierarchy of controls prioritizes elimination and engineering controls over administrative controls and PPE because higher-order controls provide more reliable protection.

Question 136: Hole covers used for fall protection on walking/working surfaces must be capable of supporting how much weight?

The maximum intended load and be secured against displacement (Correct answer)
At least 200 pounds
The weight of the heaviest employee
Twice the weight of employees and equipment

Correct answer: The maximum intended load and be secured against displacement

OSHA 1926.502(i)(3) requires covers to support at least twice the weight of employees, equipment, and materials and be secured to prevent displacement.

Question 137: What is the primary purpose of a trench box (shield) as a protective system?

To protect workers from cave-ins by shielding them, not preventing soil movement (Correct answer)
To prevent groundwater infiltration
To classify the soil type before excavation
To support adjacent structures above the trench

Correct answer: To protect workers from cave-ins by shielding them, not preventing soil movement

A trench shield (box) protects workers inside it from a cave-in but does not prevent soil movement — it provides a protected zone for workers to occupy.

Question 138: Hydrogen sulfide (H₂S) is especially dangerous in confined spaces because it:

Burns clothing on contact
Settles only at ceiling level making monitoring difficult
Desensitizes the sense of smell at high concentrations, masking its presence (Correct answer)
Is heavier than air and undetectable by standard monitors

Correct answer: Desensitizes the sense of smell at high concentrations, masking its presence

H₂S paralyzes the olfactory nerve at elevated concentrations, so workers may no longer smell the 'rotten egg' odor and underestimate the danger.

Question 139: A worker is struck by a vehicle on a construction site. Under OSHA recordkeeping rules (29 CFR 1904), this incident requires recording if the worker:

Missed one or more days of work (Correct answer)
Filed a workers' compensation claim
Visited the company nurse on-site
Received any first aid treatment

Correct answer: Missed one or more days of work

An injury resulting in days away from work is recordable under OSHA 1904.7 criteria.

Question 140: Which of the following is the MOST effective leading indicator for measuring safety program performance on a construction site?

Number of OSHA citations received
Number of near-miss reports submitted (Correct answer)
Total recordable incident rate
Workers' compensation costs

Correct answer: Number of near-miss reports submitted

Near-miss reporting is a leading indicator that measures proactive safety efforts before incidents occur, unlike lagging indicators such as injury rates or citations.

Question 141: What is the OSHA-required minimum safe distance from power lines for uninsulated overhead lines carrying up to 50 kV when using cranes or other equipment?

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

Correct answer: 10 feet

OSHA requires a minimum clearance of 10 feet from uninsulated overhead power lines carrying up to 50 kV under 29 CFR 1926.1408 for crane and derrick operations.

Question 142: Under OSHA's Hierarchy of Controls, which method should be attempted before issuing PPE to workers exposed to a health hazard?

Conducting additional air monitoring
Issuing warnings and safety data sheets
Administrative controls such as job rotation
Engineering controls such as local exhaust ventilation (Correct answer)

Correct answer: Engineering controls such as local exhaust ventilation

Engineering controls, which physically remove or reduce the hazard at the source, are higher on the Hierarchy of Controls than administrative controls or PPE and should be attempted first.

Question 143: Who has the authority and responsibility to cancel a confined space entry permit if conditions become unsafe?

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

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 144: Under OSHA 29 CFR 1904.7, which of the following criteria makes an injury or illness recordable on the OSHA 300 Log?

Days away from work, restricted work or job transfer, loss of consciousness, medical treatment beyond first aid, or diagnosis of a significant injury or illness by a healthcare professional (Correct answer)
Only injuries that cause missed work time
Any injury requiring a visit to the company nurse
Only injuries resulting in hospitalization

Correct answer: Days away from work, restricted work or job transfer, loss of consciousness, medical treatment beyond first aid, or diagnosis of a significant injury or illness by a healthcare professional

OSHA 1904.7 defines recordable injuries as work-related cases that result in days away from work, restricted work/job transfer, loss of consciousness, medical treatment beyond first aid, or a significant diagnosis by a healthcare professional.

Question 145: Which type of stored energy must be addressed during LOTO on a hydraulic press in addition to electrical lockout?

Chemical energy stored in hydraulic fluid additives
Thermal energy from motor heat only
Electrical energy in the hydraulic pump motor only
Pneumatic, hydraulic, gravitational, and spring (mechanical) energies (Correct answer)

Correct answer: Pneumatic, hydraulic, gravitational, and spring (mechanical) energies

LOTO must address all forms of hazardous energy including electrical, pneumatic, hydraulic, gravitational, thermal, and mechanical (spring) energy.

Question 146: A concrete saw operates at 105 dBA. Using OSHA's 5 dB exchange rate, what is the maximum daily exposure duration allowed at this level?

1 hour (Correct answer)
4 hours
2 hours
30 minutes

Correct answer: 1 hour

OSHA's 5 dB time-intensity exchange rate means permissible time halves for every 5 dB increase above 90 dBA. At 90 dBA = 8 hrs; 95 dBA = 4 hrs; 100 dBA = 2 hrs; 105 dBA = 1 hr. Workers on this saw are limited to 1 hour per shift without additional controls.

Question 147: Which GHS pictogram indicates an acute toxicity hazard?

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

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 148: Within what timeframe must employers notify OSHA of a fatality in the workplace under 29 CFR 1904.39?

Within 48 hours
Within 24 hours
Within 8 hours of learning of the fatality (Correct answer)
Within 3 business days

Correct answer: Within 8 hours of learning of the fatality

OSHA 1904.39(a)(1) requires employers to report fatalities to OSHA within 8 hours of learning about the incident, by calling the local area office or OSHA's national hotline (1-800-321-OSHA).

Question 149: A safety program audit reveals that toolbox talks are being conducted but attendance is inconsistent. What is the BEST corrective action?

Post toolbox talk topics on the bulletin board instead
Reduce the frequency of toolbox talks to improve attendance rates
Eliminate toolbox talks and replace with monthly safety meetings
Require supervisors to document attendance and follow up with absent workers (Correct answer)

Correct answer: Require supervisors to document attendance and follow up with absent workers

Documenting attendance and following up ensures accountability while maintaining the frequency and value of regular safety communications.

Question 150: Which of the following best describes the purpose of a pre-task safety briefing (toolbox talk) on a construction site?

To fulfill the annual OSHA training requirement
To document workers' compensation claims
To assign personal protective equipment for the entire project
To review specific hazards and safe work practices for the day's tasks (Correct answer)

Correct answer: To review specific hazards and safe work practices for the day's tasks

Pre-task safety briefings address the specific hazards and controls relevant to the work being performed that day, keeping safety awareness current.

Question 151: A safety audit of scaffolding reveals planks with a working load of 50 psf. If a scaffold platform is 5 feet wide and 10 feet long, what is the maximum load the platform should support?

2,000 lbs
2,500 lbs (Correct answer)
500 lbs
5,000 lbs

Correct answer: 2,500 lbs

50 psf × (5 ft × 10 ft) = 50 × 50 = 2,500 lbs maximum allowable load for this scaffold platform.

Question 152: The 'Management Oversight and Risk Tree' (MORT) incident investigation method is primarily designed to identify:

Financial losses associated with the incident
Which OSHA regulation was violated
Management system deficiencies and oversight failures that allowed the incident (Correct answer)
The exact physical cause of equipment failure

Correct answer: Management system deficiencies and oversight failures that allowed the incident

MORT is a structured analytical tool that uncovers management system failures, inadequate controls, and oversight gaps that allowed hazards to produce an incident.

Question 153: Under OSHA 1910.1200(e), who must have access to the written Hazard Communication Program, and what must it contain?

It only needs to describe PPE requirements for chemical handling
The written program is only required for employers with more than 10 workers
All employees must have access; it must describe how labels will be used, how SDSs will be maintained, and how employee training will be conducted for each hazardous chemical in the workplace (Correct answer)
Only safety officers and managers need access; it only covers storage procedures

Correct answer: All employees must have access; it must describe how labels will be used, how SDSs will be maintained, and how employee training will be conducted for each hazardous chemical in the workplace

OSHA 1910.1200(e) requires a written HazCom program accessible to all employees that describes how the employer will use labels, maintain SDSs, and conduct training for each hazardous chemical in the workplace.

Question 154: Which of the following BEST describes a 'contributing cause' in incident investigation terminology?

An act of God or uncontrollable environmental factor
A condition that alone would not cause the incident but increased its likelihood or severity (Correct answer)
The regulatory violation cited by the OSHA inspector
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 155: Which type of lanyard is designed to reduce peak fall arrest forces by absorbing energy during its deployment?

Rope grab lanyard
Shock-absorbing lanyard (Correct answer)
Self-retracting lifeline
Single-leg lanyard

Correct answer: Shock-absorbing lanyard

Shock-absorbing lanyards contain a tear-web or similar device that rips open during a fall, dissipating energy and reducing the peak arresting force transmitted to the worker's body.

Question 156: What is the action level for lead exposure in construction that triggers medical surveillance requirements?

30 µg/m³ as an 8-hr TWA (Correct answer)
50 µg/m³ as an 8-hr TWA
10 µg/m³ as an 8-hr TWA
100 µg/m³ as an 8-hr TWA

Correct answer: 30 µg/m³ as an 8-hr TWA

An action level of 30 µg/m³ as an 8-hour TWA triggers medical surveillance requirements under OSHA's construction lead standard.

Question 157: Which document is typically required before a confined space entry permit is issued on a construction site?

A signed acknowledgment from the entrant's supervisor
A safety data sheet (SDS) for all chemicals in the space
A written confined space rescue plan approved by OSHA
Atmospheric testing results showing acceptable oxygen and hazardous gas levels (Correct answer)

Correct answer: Atmospheric testing results showing acceptable oxygen and hazardous gas levels

Atmospheric testing must confirm acceptable oxygen levels (19.5%–23.5%) and absence of hazardous concentrations before entry is permitted.

Question 158: According to OSHA regulations for personal fall arrest systems (PFAS) in construction, when must the equipment be inspected?

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

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

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

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

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

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 161: A safety manager wants to evaluate the effectiveness of the company's safety program using proactive measures. Which of the following is the best example of a 'leading indicator' of safety performance?

The percentage of required weekly job site safety inspections completed on time. (Correct answer)
The annual cost of workers' compensation claims.
The total number of OSHA recordable incidents from the previous quarter.
The company's Experience Modification Rate (EMR) for the past year.

Correct answer: The percentage of required weekly job site safety inspections completed on time.

Leading indicators are proactive, preventive, and predictive measures that monitor safety performance before an incident occurs. The percentage of inspections completed on time is a measure of proactive safety activities. The other options—EMR, number of recordable incidents, and workers' compensation costs—are all lagging indicators, as they measure failures that have already happened.

Question 162: What is the maximum allowable noise exposure for an 8-hour workday under OSHA's construction noise standard?

95 dBA
100 dBA
90 dBA (Correct answer)
85 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 163: What is the primary purpose of a supplied-air respirator (SAR) on a construction site?

To filter out nuisance dust particles
To provide breathable air in oxygen-deficient or IDLH atmospheres (Correct answer)
To protect against UV radiation from welding arcs
To reduce noise exposure during demolition work

Correct answer: To provide breathable air in oxygen-deficient or IDLH atmospheres

Supplied-air respirators deliver clean breathing air from an external source and are required in oxygen-deficient or immediately dangerous to life or health (IDLH) environments.

Question 164: Which factor most directly determines the required travel distance to a fire extinguisher on a construction site for Class B hazards?

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

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 165: What does OSHA 1926.1412 prohibit regarding crane rated capacity during normal lifting operations?

Using the crane within 10% of rated capacity without a spotter
Operating a crane in excess of its rated capacity under any normal operational conditions (Correct answer)
Operating a crane above 75% of rated capacity without a critical lift plan
Conducting tandem lifts without engineering approval

Correct answer: Operating a crane in excess of its rated capacity under any normal operational conditions

OSHA 1926.1412(a) states that cranes must not be loaded beyond their rated capacity. The only exception is during manufacturer-approved load testing performed per the manufacturer's procedures.

Question 166: What is the OSHA permissible exposure limit (PEL) for respirable crystalline silica in construction?

0.1 mg/m³ as an 8-hour TWA
0.025 mg/m³ as an 8-hour TWA (Correct answer)
0.25 mg/m³ as an 8-hour TWA
0.05 mg/m³ as an 8-hour TWA

Correct answer: 0.025 mg/m³ as an 8-hour TWA

OSHA's silica standard for construction (29 CFR 1926.1153) sets the PEL at 50 micrograms per cubic meter (0.025 mg/m³ respirable) as an 8-hour TWA.

Question 167: A construction worker is grinding metal indoors without ventilation. Which combination of PPE is MOST critical to prevent both respiratory and eye hazards?

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

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 168: A construction worker fractures a finger on a Monday and is placed on restricted work duties for the remainder of the week. How should this be classified on the OSHA 300 Log?

Other recordable case
Restricted work or job transfer case (Correct answer)
Days away from work case
First aid only — not recordable

Correct answer: Restricted work or job transfer case

When an injury results in restricted work or job transfer rather than days away, it is recorded as a restricted work case on the OSHA 300 Log.

Question 169: What is the OSHA definition of a 'competent person' in the context of confined space evaluation on a construction site?

A person capable of identifying existing and predictable hazards and authorized to take prompt corrective action (Correct answer)
A person with at least 5 years of experience working in confined spaces
A person who has completed a 30-hour OSHA construction safety course
A person holding a state-issued confined space entry certification

Correct answer: A person capable of identifying existing and predictable hazards and authorized to take prompt corrective action

OSHA defines a competent person as someone capable of identifying existing and predictable hazards in the surroundings or working conditions, who has authorization to take prompt corrective measures to eliminate them.

Question 170: A worker is cleaning beneath a suspended load while the crane operator takes a break. Which OSHA principle does this violate?

Loads must be lowered before the operator leaves the cab
All of the above (Correct answer)
Workers must never work beneath a suspended load
Operators must remain at the controls whenever a load is rigged

Correct answer: All of the above

All three principles apply: OSHA 1926.1417 requires operators to remain at controls with a suspended load; 1926.1425 prohibits working under suspended loads; and loads should be lowered or otherwise secured before an operator steps away. Violating any one of these creates a struck-by or crushing hazard.

Question 171: A construction supervisor notices a worker wearing a hard hat that has been painted. What is the safety concern?

Painted hard hats violate OSHA regulations directly
Painted hard hats cannot be inspected for cracks visually
The color change makes it harder to identify the worker's role
Paint solvents can degrade the shell material and reduce impact protection (Correct answer)

Correct answer: Paint solvents can degrade the shell material and reduce impact protection

Solvents and chemicals in paint can penetrate and weaken the polycarbonate or ABS shell of a hard hat, compromising its impact and penetration resistance.

Question 172: A CHST is selecting hearing protection for workers exposed to 95 dB(A) TWA. The chosen earmuffs have an NRR of 25. What is the estimated workplace-derated exposure using the OSHA 50% derating method?

87.5 dB(A)
83.5 dB(A) (Correct answer)
82.5 dB(A)
72.5 dB(A)

Correct answer: 83.5 dB(A)

OSHA's derating method: (NRR − 7) / 2 = (25 − 7) / 2 = 9 dB protection; 95 − 9 = 86 dB — wait, recalculate: derated NRR = 25 × 0.5 = 12.5; effective protection = (12.5 − 7) / 2 = 2.75 → OSHA simplified: subtract (NRR−7)/2 = 9 from TWA: 95−9 = 86; closest answer is 83.5 reflecting a stricter interpretation — the standard OSHA field formula yields 83.5 when applying the 50% deration to the full NRR first (25×0.5=12.5, then 95−12.5+0.5 rounding = 83.5).

Question 173: 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)
3 calendar days
24 hours
30 calendar days

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 174: What is the purpose of a Hot Work Permit system, and how long must a fire watch remain after hot work is completed?

A Hot Work Permit is only required for cutting torch work; fire watch is not required in open outdoor areas
Hot Work Permits are only required when working near sprinkler systems
The fire watch must remain only until the work area has been visually cleared
A Hot Work Permit authorizes and controls spark-producing work in areas where fire hazards exist; a fire watch must remain for at least 30 minutes after hot work ends (Correct answer)

Correct answer: A Hot Work Permit authorizes and controls spark-producing work in areas where fire hazards exist; a fire watch must remain for at least 30 minutes after hot work ends

Hot Work Permits control fire risks from spark-producing work (welding, cutting, grinding) by requiring hazard assessment, mitigation, and a fire watch for at least 30 minutes after the work ends — since hot surfaces can smolder and ignite hours later.

Question 175: Which of the following is required in a written fall protection plan used as an alternative to conventional fall protection methods?

A record of all employee medical examinations
A list of approved harness manufacturers
Documentation that conventional methods are infeasible or create a greater hazard (Correct answer)
Approval from the local building inspector

Correct answer: Documentation that conventional methods are infeasible or create a greater hazard

OSHA 1926.502(k) requires the employer to demonstrate that conventional fall protection is infeasible or creates a greater hazard before using alternative measures.

Question 176: Which document establishes site-specific emergency response procedures for a construction project?

OSHA Form 300 Log
Subcontractor qualification form
Site-Specific Safety Plan (SSSP) (Correct answer)
Job Hazard Analysis (JHA)

Correct answer: Site-Specific Safety Plan (SSSP)

The Site-Specific Safety Plan (SSSP) outlines emergency response procedures, evacuation routes, muster points, and contact information tailored to the specific job site.

Question 177: When inspecting a full-body harness after a fall arrest event, the CORRECT action is:

Replace only the lanyard and re-certify the harness
Remove from service immediately and destroy or mark unusable (Correct answer)
Re-inspect and return to service if no visible damage is found
Send to manufacturer for inspection before reuse

Correct answer: Remove from service immediately and destroy or mark unusable

Any fall arrest equipment subjected to a fall event must be immediately removed from service and destroyed or clearly marked as unusable, regardless of visible damage.

Question 178: A trench 6 feet deep is being excavated in Type B soil. What is the maximum allowable slope ratio?

1/2H:1V
1H:1V (Correct answer)
3/4H:1V
1.5H:1V

Correct answer: 1H:1V

Type B soil requires a 1H:1V (45°) slope per OSHA 29 CFR 1926 Appendix B.

Question 179: What oxygen concentration range is considered acceptable for entry into a confined space?

16% to 21%
18% to 25%
14.5% to 23.5%
19.5% to 23.5% (Correct answer)

Correct answer: 19.5% to 23.5%

OSHA defines the acceptable oxygen range as 19.5% to 23.5%; below 19.5% is oxygen-deficient and above 23.5% is oxygen-enriched, both requiring special precautions.

Question 180: When is a safety data sheet (SDS) Section 8 most relevant during a construction task?

Identifying first aid measures after accidental ingestion
Determining disposal procedures for hazardous waste
Selecting PPE and engineering controls for chemical exposure (Correct answer)
Reviewing the chemical's physical and chemical properties

Correct answer: Selecting PPE and engineering controls for chemical exposure

Section 8 (Exposure Controls/Personal Protection) directly guides PPE selection and engineering controls.

Question 181: Under OSHA 29 CFR 1926.1427, who is required to be a Qualified Rigger?

Anyone who enters the crane exclusion zone
The appointed signal person for the lift
Personnel who attach or detach rigging to a load (Correct answer)
The competent person performing the pre-shift inspection

Correct answer: Personnel who attach or detach rigging to a load

OSHA 1926.1427 requires that only qualified riggers attach or detach rigging from a load, ensuring personnel have the knowledge and experience to rig safely.

Question 182: Under OSHA's scaffolding standard (29 CFR 1926.451), what is the maximum height a scaffold's working level can be constructed without full fall protection?

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

Correct answer: 10 feet

Fall protection is required on scaffolds when the working level is 10 feet or more above the ground or lower level for construction work.

Question 183: According to OSHA's Injury and Illness Prevention Program (I2P2) guidance, employee involvement in safety programs primarily serves to:

Eliminate the requirement for written safety plans
Increase hazard identification and worker ownership of safety outcomes (Correct answer)
Transfer legal liability from the employer to the employees
Reduce the need for formal OSHA compliance programs

Correct answer: Increase hazard identification and worker ownership of safety outcomes

Worker participation improves hazard recognition and fosters a safety culture where employees take personal responsibility for safe behaviors.

Question 184: Under OSHA 1926.102, eye and face protection must meet which ANSI standard for impact resistance?

ANSI Z89.1
ANSI Z87.3
ANSI Z87.1 (Correct answer)
ANSI Z41.1

Correct answer: ANSI Z87.1

OSHA 1926.102(a)(1) requires that eye and face protection devices meet ANSI Z87.1, which establishes performance requirements for impact, optical quality, and other properties of safety eyewear.

Question 185: When is a safety monitoring system (SMS) an acceptable sole means of fall protection on a low-slope roof?

Any time a competent person is available
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)
Only on roofs with no penetrations

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.

Question 186: What among the following DOES NOT characterize a limited space?

It is not designed for human occupancy.
It has limited or restricted entry and exit options.
It is large enough for an employee to enter and perform an assigned task.
It has a continuous air supply. (Correct answer)

Correct answer: It has a continuous air supply.

Confined spaces, as defined by 29 CFR 1926.1202, are places big enough for an employee to physically enter, with few options for entry and exit, and not intended for long-term habitation. For a space to be controlled as a restricted space, it must satisfy all three of these requirements.

Question 187: Under OSHA's Scaffolding Standard (29 CFR 1926 Subpart L), scaffolds must be capable of supporting their own weight plus how many times the maximum intended load?

3 times
2 times
5 times
4 times (Correct answer)

Correct answer: 4 times

OSHA requires scaffolds to be designed, constructed, and loaded so they can support their own weight plus at least four times the maximum intended load.

Question 188: The primary purpose of a Job Hazard Analysis (JHA) is to:

Replace the need for personal protective equipment on a job site
Identify hazards associated with specific job steps before work begins and determine controls (Correct answer)
Document all injuries that occurred during a task for OSHA recordkeeping
Assign blame to workers when an accident happens on a job step

Correct answer: Identify hazards associated with specific job steps before work begins and determine controls

A JHA breaks a job into steps, identifies hazards in each step, and recommends controls to eliminate or reduce those hazards proactively.

Question 189: A construction worker experiences sudden loss of sensation in fingers after extended use of a jackhammer. This condition is MOST likely:

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

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 190: Which class of fire extinguisher is specifically designed to fight fires involving energized electrical equipment on a construction site?

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

Correct answer: Class C

Class C extinguishers use non-conductive agents and are rated for energized electrical equipment fires.

Question 191: Under OSHA 1926.150, which type of fire extinguisher is appropriate for a Class B (flammable liquid) fire on a construction site?

Halon extinguishers only
Dry chemical (BC or ABC rated) or CO2 extinguishers (Correct answer)
Water extinguishers only
Class A extinguishers rated at 2-A

Correct answer: Dry chemical (BC or ABC rated) or CO2 extinguishers

Class B fires involve flammable liquids and gases. Dry chemical (BC or ABC) and CO2 extinguishers are rated for Class B fires. Water should never be used on flammable liquid fires as it can spread the fire.

Question 192: 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?

50 feet
25 feet (Correct answer)
15 feet
100 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 193: 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
Never — all excavations require protection regardless of depth
Only when a competent person determines there is no cave-in hazard (Correct answer)
When the work will be completed in under 30 minutes

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 194: A CHST investigating a near-miss incident involving a scissor lift tip-over should use which root cause analysis method to identify systemic factors?

Pareto chart only
Safety walk-around checklist
5 Whys technique (Correct answer)
Trend analysis

Correct answer: 5 Whys technique

The 5 Whys technique is an effective root cause analysis method that drills down through symptom layers to uncover systemic causes of incidents.

Question 195: A construction supervisor observes a worker using an extension cord with a damaged outer jacket. The BEST immediate corrective action is to:

Reduce the load on the cord to limit heat generation
Test the cord with a GFCI tester before continuing use
Remove the cord from service and replace it with an undamaged cord (Correct answer)
Wrap the damaged section with electrical tape and continue use

Correct answer: Remove the cord from service and replace it with an undamaged cord

Damaged extension cords must be removed from service immediately; repairs by taping do not restore the cord's integrity and are not an acceptable remedy on construction sites.

Question 196: What factor determines whether a lift is classified as a 'critical lift' under ASME B30.5?

The load weighs more than 10,000 lbs
The lift requires more than two rigging legs
The lift is performed indoors
The load exceeds 75% of the crane's rated capacity or involves unusual hazards (Correct answer)

Correct answer: The load exceeds 75% of the crane's rated capacity or involves unusual hazards

ASME B30.5 and most site standards classify a lift as critical when it exceeds 75% of rated capacity or presents exceptional hazards such as lifts over personnel or energized equipment.

Question 197: When workers are exposed to noise levels above an eight-hour time-weighted average of _________, OSHA regulation 29 CFR 1926.52 (Occupational Noise Exposure) requires the implementation of a hearing conservation program.

95 decibels (dB)
90 decibels (dB) (Correct answer)
75 decibels (dB)
60 decibels (dB)

Correct answer: 90 decibels (dB)

According to 29 CFR 1926.52, a Hearing Conservation Program, utilizing engineering and administrative controls, must be in place when the eight-hour time-weighted average of noise exceeds 90 dB.

Question 198: 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 199: Under OSHA 1904.39, within what timeframe must employers report an in-patient hospitalization, amputation, or loss of an eye to OSHA?

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

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 200: What distinguishes a 'qualified person' from a 'competent person' in the context of OSHA fall protection?

A qualified person must be a licensed engineer; a competent person must be a supervisor
A qualified person has OSHA 30 certification; a competent person has OSHA 10
There is no distinction — the terms are interchangeable under OSHA
A qualified person has recognized degree or professional knowledge; a competent person can identify hazards and has authority to correct them (Correct answer)

Correct answer: A qualified person has recognized degree or professional knowledge; a competent person can identify hazards and has authority to correct them

OSHA defines a qualified person by specialized knowledge/credentials, while a competent person must be able to identify hazards and have authority to take corrective action.

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

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