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

Question 1: What is the required minimum height for the top edge of a guardrail system used in construction?

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

Correct answer: 42 inches

OSHA 1926.502(b)(1) requires the top edge of guardrail systems to be 42 inches plus or minus 3 inches above the walking/working surface.

Question 2: Under OSHA's multi-employer citation policy, which employer type can be cited for creating a hazardous condition on a construction site even if none of its own employees are exposed?

Controlling employer
Exposing employer
Correcting employer
Creating employer (Correct answer)

Correct answer: Creating employer

The creating employer is the one whose actions or inactions caused the hazard, and can be cited regardless of whose employees are exposed.

Question 3: Under OSHA 29 CFR 1926, what is the minimum safe distance workers on foot must maintain from the path of a swinging crane load unless otherwise protected?

10 feet (Correct answer)
The load's maximum radius plus 2 feet
15 feet
6 feet

Correct answer: 10 feet

OSHA 29 CFR 1926.1425 requires workers to stay at least 10 feet away from the path of a swinging crane load or be protected by a physical barrier. This prevents struck-by injuries from load swing or dropped material.

Question 4: Under OSHA 29 CFR 1926.502, what is the minimum height at which personal fall arrest systems must be used on scaffolding when guardrails are not provided?

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

Correct answer: 6 feet

OSHA requires fall protection for scaffold workers at heights of 6 feet or more above a lower level when guardrails are not provided.

Question 5: What condition requires a scaffold to be immediately removed from service, regardless of other factors?

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

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

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

Question 6: According to NFPA 70E, what is the primary purpose of an Energized Electrical Work Permit?

To satisfy OSHA recordkeeping requirements for electrical incidents
To replace LOTO procedures for low-voltage systems
To document justification, risk assessment, and safety measures when work on energized equipment cannot be avoided (Correct answer)
To authorize unqualified workers to perform electrical tasks under supervision

Correct answer: To document justification, risk assessment, and safety measures when work on energized equipment cannot be avoided

An Energized Electrical Work Permit formally documents why de-energizing is not feasible, the hazard analysis, required PPE, and approval chain before energized work begins.

Question 7: Which document is MOST critical to have completed and communicated before mobilizing to a new construction project?

The project's environmental impact assessment
A site-specific safety plan tailored to the project scope and hazards (Correct answer)
The project schedule and Gantt chart
The subcontractor bid comparison sheet

Correct answer: A site-specific safety plan tailored to the project scope and hazards

A site-specific safety plan addresses the unique hazards, emergency procedures, and safety requirements of the particular project and must be in place before work begins.

Question 8: What is the maximum permissible noise exposure level for an 8-hour time-weighted average under OSHA standards?

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

Correct answer: 90 dBA

OSHA's permissible exposure limit (PEL) for noise is 90 dBA over an 8-hour TWA as specified in 29 CFR 1926.52.

Question 9: Under OSHA excavation standards, at what depth must a protective system such as shoring, sloping, or shielding be used for trenches?

10 feet
5 feet (Correct answer)
3 feet
8 feet

Correct answer: 5 feet

OSHA requires protective systems for trenches 5 feet or deeper, unless the excavation is in stable rock.

Question 10: What document must be available in the cab or on the crane at all times during operations?

Operator's training certificate
Manufacturer's load chart (Correct answer)
Site safety plan
Daily inspection log

Correct answer: Manufacturer's load chart

OSHA 29 CFR 1926.1417 requires the load chart to be in the cab and legible so operators can verify capacity before any lift.

Question 11: What does the acronym 'IDLH' stand for in confined space and respiratory protection standards?

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

Correct answer: Immediate Danger to Life and Health

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

Question 12: Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections does a Safety Data Sheet (SDS) contain?

20
8
12
16 (Correct answer)

Correct answer: 16

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

Question 13: During scaffold erection, which workers are required to have fall protection?

Workers above 10 feet only
All workers erecting or dismantling scaffolds above 6 feet when feasible (Correct answer)
Only workers on completed scaffold platforms
No workers — scaffold erection is exempt from fall protection requirements

Correct answer: All workers erecting or dismantling scaffolds above 6 feet when feasible

OSHA requires scaffold erectors and dismantlers to have fall protection when feasible, recognizing that guardrails may not yet be in place during the process.

Question 14: Under OSHA's cranes and derricks standard (29 CFR 1926.1408), what is the minimum required clearance distance from energized power lines up to 50 kV when no encroachment prevention measures are in place?

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

Correct answer: 10 feet

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

Question 15: Under OSHA 29 CFR 1926, which of the following is the minimum required height for guardrail systems on construction sites?

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

Correct answer: 42 inches

OSHA 1926.502 requires guardrail systems to be 42 inches (plus or minus 3 inches) in height measured from the walking/working surface.

Question 16: How does OSHA define a 'competent person' in construction, and how does it differ from a 'qualified person'?

A competent person works for the general contractor; a qualified person is an outside consultant
A competent person holds a professional engineering license; a qualified person has OSHA 30-hour training
A competent person can identify hazards and has authority to take prompt corrective action; a qualified person has technical knowledge or experience but may not have the authority to stop work (Correct answer)
They are interchangeable terms used throughout OSHA's construction standards

Correct answer: A competent person can identify hazards and has authority to take prompt corrective action; a qualified person has technical knowledge or experience but may not have the authority to stop work

OSHA defines a competent person as someone who can identify hazardous conditions and has authority to promptly correct them. A qualified person has recognized knowledge and experience to solve technical problems but the role does not carry mandatory corrective authority.

Question 17: The primary purpose of a Job Hazard Analysis (JHA) is to:

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

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

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

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

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

Question 19: Which hierarchy of controls level offers the highest level of worker protection?

PPE
Elimination (Correct answer)
Administrative controls
Engineering controls

Correct answer: Elimination

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

Question 20: What is the correct sequence for donning a chemical-resistant suit when handling hazardous materials on a construction site?

Respirator first, then suit, then outer gloves, then boots (Correct answer)
Suit first, then boots, then gloves, then respirator last
Gloves first, then suit, then respirator, then boots
Boots first, then inner gloves, then suit, then respirator

Correct answer: Respirator first, then suit, then outer gloves, then boots

The respirator is donned first to protect airways before any chemical exposure risk during suiting up; then the suit is closed over the respirator straps to create a seal, outer gloves are taped to the suit sleeves, and boots complete the barrier — ensuring no skin or airway is exposed during the donning process.

Question 21: A supervisor needs to store 20 gallons of gasoline indoors on a construction site, but not in a designated inside storage room. According to 29 CFR 1926.152, which method is NOT compliant?

Storing it in a single 20-gallon drum that is not a DOT-approved container or safety can. (Correct answer)
Placing approved safety cans inside an approved flammable liquid storage cabinet.
Keeping the storage area free of ignition sources.
Storing it in four approved 5-gallon safety cans outside of a cabinet.

Correct answer: Storing it in a single 20-gallon drum that is not a DOT-approved container or safety can.

OSHA standard 29 CFR 1926.152(b)(1) states that 'No more than 25 gallons of flammable liquids shall be stored in a room outside of an approved storage cabinet.' Furthermore, 1926.152(a)(1) requires that only approved containers and portable tanks shall be used. Storing the gasoline in a single, non-approved 20-gallon drum violates the container requirement.

Question 22: What is the minimum approach distance for unqualified workers near overhead power lines energized at 50 kV or less on a construction site?

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

Correct answer: 10 feet

OSHA 29 CFR 1926.416 requires unqualified workers to maintain at least 10 feet from overhead power lines energized at 50 kV or less.

Question 23: Which leading indicator is MOST useful for measuring the effectiveness of a construction safety program?

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

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 24: What health hazards are associated with prolonged exposure to Portland cement on construction sites?

Asphyxiation hazard only from fine particle inhalation
Explosive hazard from rapid chemical reaction with water
Flammable vapor hazard during mixing
Silicosis risk from crystalline silica content, skin sensitization from hexavalent chromium, and severe chemical burns from wet cement's high alkalinity (Correct answer)

Correct answer: Silicosis risk from crystalline silica content, skin sensitization from hexavalent chromium, and severe chemical burns from wet cement's high alkalinity

Portland cement contains crystalline silica (carcinogen), hexavalent chromium (skin and respiratory sensitizer), and has a pH of 12–13 when wet, causing severe chemical burns with prolonged skin contact.

Question 25: A construction safety technician discovers that the company's written safety program has not been updated in three years. What should be the FIRST priority in the revision?

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

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

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

Question 26: On a construction site, temporary wiring must be protected by GFCIs or an assured equipment grounding conductor program (AEGCP). Under the AEGCP, how frequently must receptacles be tested?

Daily before each use
Weekly on Mondays before work begins
Before first use, after repairs, and at 3-month intervals (Correct answer)
Only when a worker receives a shock

Correct answer: Before first use, after repairs, and at 3-month intervals

OSHA 1926.404(b)(1)(iii) requires AEGCP receptacles to be tested before first use, after repairs, and at 3-month intervals.

Question 27: What is the minimum safe distance a crane must maintain from energized power lines rated at 50 kV or below?

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

Correct answer: 10 feet

OSHA 29 CFR 1926.1408 requires a minimum 10-foot clearance from energized power lines up to 50 kV.

Question 28: What is the correct method for determining the total weight of a load before a crane lift?

Estimate the weight visually based on the rigger's experience
Rely solely on the load moment indicator reading after the load is lifted off the ground
Use certified weight data from shipping documents or engineering calculations plus the weight of all rigging hardware (Correct answer)
Weigh only the main load component and disregard the rigging gear weight

Correct answer: Use certified weight data from shipping documents or engineering calculations plus the weight of all rigging hardware

Accurate load weight determination requires verified weight data from reliable sources such as shipping records, manufacturer specs, or engineering calculations, including all rigging hardware in the total.

Question 29: Under OSHA standards, a competent person must inspect fall protection equipment at what minimum frequency?

Annually
Monthly
Before each use (Correct answer)
Weekly

Correct answer: Before each use

OSHA requires that fall protection equipment be inspected by a competent person before each use.

Question 30: OSHA requires employers to orally report a fatality to the nearest OSHA office within:

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

Correct answer: 8 hours

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

Question 31: What does a yellow color-coding designation typically indicate on construction sites under ANSI/ISEA standards?

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

Correct answer: Caution or physical hazard

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

Question 32: What does the acronym SDS stand for in the context of construction site safety?

Site Danger Summary
Safety Disclosure Statement
Safety Data Sheet (Correct answer)
Standard Documentation System

Correct answer: Safety Data Sheet

SDS stands for Safety Data Sheet, a document that provides detailed information about chemical hazards, safe handling, and emergency procedures.

Question 33: Under OSHA's Process Safety Management (PSM) standard (29 CFR 1910.119), what quantity of flammable liquids in a single process triggers PSM coverage?

5,000 pounds
1,000 pounds
10,000 pounds (Correct answer)
25,000 pounds

Correct answer: 10,000 pounds

Flammable liquids stored or processed in a single vessel at 10,000 pounds or more above their normal boiling point trigger PSM requirements.

Question 34: Which type of personal protective equipment is classified as 'Level B' in the EPA's hazardous materials protection framework, and when is it most appropriate for construction workers?

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

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

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

Question 35: According to OSHA standards for construction (29 CFR 1926), what is the minimum clearance distance that must be maintained from overhead power lines rated 50kV or less for unqualified persons?

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

Correct answer: 10 feet

OSHA standard 29 CFR 1926.1408, Table A, specifies that for voltages up to 50kV, the minimum clearance distance is 10 feet. This distance is crucial for preventing accidental contact by personnel or equipment like cranes and aerial lifts.

Question 36: A construction site has an 8-foot deep trench dug entirely in Type A soil. The competent person has observed that heavy vehicle traffic is causing vibrations near the trench. Which of the following is the correct action for the competent person to take?

Slope the trench at an angle of 53 degrees.
Reclassify the soil and adjust the protective system accordingly. (Correct answer)
Install a warning system for the mobile equipment.
No action is needed as Type A soil is the most stable.

Correct answer: Reclassify the soil and adjust the protective system accordingly.

According to OSHA's soil classification system, a soil cannot be classified as Type A if it is subject to vibration. The competent person must re-evaluate and reclassify the soil, which would likely downgrade it to Type B or C, requiring a change in the protective system (e.g., changing the slope angle or using shoring/shielding).

Question 37: Which type of forced ventilation is most effective for purging a confined space of vapors heavier than air?

Exhaust ventilation from the top of the space only
Forced air supply directed through the top of the space
Forced air supply directed near the bottom of the space (Correct answer)
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 38: A roofer experiences tingling and numbness in fingers after long-term use of vibrating equipment. This condition is BEST described as:

Carpal tunnel syndrome caused by repetitive flexion
Hand-arm vibration syndrome (HAVS) including vascular and neurological effects (Correct answer)
Raynaud's disease unrelated to occupational exposure
Contact dermatitis from roofing adhesives

Correct answer: Hand-arm vibration syndrome (HAVS) including vascular and neurological effects

Hand-arm vibration syndrome (HAVS) results from prolonged exposure to hand-transmitted vibration, causing both vascular (vibration white finger) and neurological symptoms like tingling and numbness.

Question 39: What is the primary purpose of using outrigger pads or crane mats?

To distribute the crane's load over a larger area to ensure ground stability. (Correct answer)
To protect the ground surface from cosmetic damage.
To increase the crane's lifting capacity beyond its rated limit.
To provide a level surface for the crane operator to stand on.

Correct answer: To distribute the crane's load over a larger area to ensure ground stability.

The primary safety function of outrigger pads or mats is to distribute the concentrated load from the outrigger floats over a larger surface area. This prevents the ground from failing, which could lead to the crane becoming unstable and tipping over.

Question 40: 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 41: A construction worker is exposed to a chemical with a flash point of 80°F (27°C). Under OSHA's flammable liquids standard, this material is classified as which class?

Class IIIA
Class IB (Correct answer)
Class II
Class IA

Correct answer: Class IB

Class IB flammable liquids have flash points below 73°F (23°C) and boiling points at or above 100°F, but a flash point of 80°F falls within Class II (between 73°F and 140°F).

Question 42: Under OSHA recordkeeping rules, which of the following injuries is NOT recordable on the OSHA 300 log?

Medical treatment beyond first aid
Loss of consciousness
First aid treatment only (Correct answer)
Restricted work activity

Correct answer: First aid treatment only

Cases requiring only first aid (as defined by 29 CFR 1904.7) are not recordable; medical treatment beyond first aid, restricted work, or lost workdays trigger recordability.

Question 43: According to OSHA's Recommended Practices for Safety and Health Programs, what are the seven core elements of an effective Safety and Health Management System?

Management Leadership; Worker Participation; Hazard Identification and Assessment; Hazard Prevention and Control; Education and Training; Program Evaluation and Improvement; Communication and Coordination for Multi-employer Worksites (Correct answer)
Written safety policy; safety committee; PPE program; OSHA 300 Log; first aid kits; emergency plan; safety posters
OSHA compliance audit; risk matrix; safety budget; recordkeeping; inspections; contractor management; performance reviews
Safety officer appointment; safety manual; annual training; incident log; insurance coverage; PPE; supervisor inspections

Correct answer: Management Leadership; Worker Participation; Hazard Identification and Assessment; Hazard Prevention and Control; Education and Training; Program Evaluation and Improvement; Communication and Coordination for Multi-employer Worksites

OSHA's Recommended Practices for Safety and Health Programs identify seven core elements: Management Leadership, Worker Participation, Hazard Identification and Assessment, Hazard Prevention and Control, Education and Training, Program Evaluation and Improvement, and Communication and Coordination for multi-employer worksites.

Question 44: When performing a root cause analysis after an incident, which tool is BEST suited for systematically identifying contributing causes by asking 'why' repeatedly?

Pareto chart
Fault tree analysis
Scatter diagram
5 Whys technique (Correct answer)

Correct answer: 5 Whys technique

The 5 Whys technique involves asking 'why' up to five times to drill down from the symptom of a problem to its root cause.

Question 45: What is the OSHA-required minimum distance that a scaffold must be erected from an energized power line rated at 50 kV or less?

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

Correct answer: 10 feet

OSHA 1926.416 requires scaffolds to be erected at least 10 feet from energized power lines rated 50 kV or less.

Question 46: 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)
Single-leg lanyard
Self-retracting lifeline

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 47: After a fall arrest event, when must equipment that arrested a fall be removed from service?

After 30 days
Only if visibly damaged
After a visual inspection clears it
Immediately, until inspected by the manufacturer or competent person (Correct answer)

Correct answer: Immediately, until inspected by the manufacturer or competent person

All fall arrest equipment involved in stopping a fall must be immediately removed from service and inspected before reuse.

Question 48: What is the OSHA requirement for means of egress from a trench that is 4 feet or more in depth?

A rope must be provided
Workers may use the trench wall for climbing if footholds are cut
A ladder must be at each end of the trench
A ladder, stairway, or ramp must be present within 25 feet of lateral travel (Correct answer)

Correct answer: A ladder, stairway, or ramp must be present within 25 feet of lateral travel

OSHA 29 CFR 1926.651(c)(2) requires a means of egress (ladder, ramp, or stairway) within 25 lateral feet of any worker in a trench 4 or more feet deep.

Question 49: What is the purpose of a 'Knox Box' installed at the entrance to a major construction project?

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

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

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

Question 50: What is the purpose of a toe board on a scaffold platform?

Anchor the scaffold to the structure
Prevent tools and materials from falling off the platform edge (Correct answer)
Support the weight of midrails
Provide additional footing for workers

Correct answer: Prevent tools and materials from falling off the platform edge

Toe boards prevent materials, tools, and debris from being kicked or rolling off scaffold platforms onto workers below.

Question 51: 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 assign personal protective equipment for the entire project
To review specific hazards and safe work practices for the day's tasks (Correct answer)
To document workers' compensation claims

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 52: According to OSHA 29 CFR 1926.451, what is the minimum load capacity a scaffold must support?

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

Correct answer: 4 times the intended load

OSHA requires scaffolds to be capable of supporting at least 4 times the maximum intended load.

Question 53: What is the primary purpose of a Job Hazard Analysis (JHA) on a construction site?

To satisfy insurance audit requirements only
To calculate workers' compensation premiums
To identify potential hazards associated with each step of a task and determine preventive measures (Correct answer)
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 tasks into steps to identify hazards and establish controls before work begins.

Question 54: In a construction site safety program, what does the acronym 'SDS' stand for, and which federal agency mandates its use under the Hazard Communication Standard?

Safety Detail Specification, mandated by NIOSH
Safety Data Sheet, mandated by OSHA (Correct answer)
Substance Disclosure Statement, mandated by OSHA
Standard Data Summary, mandated by EPA

Correct answer: Safety Data Sheet, mandated by OSHA

SDS stands for Safety Data Sheet, formerly called MSDS. OSHA's Hazard Communication Standard (29 CFR 1910.1200, applicable to construction via 1926.59) requires manufacturers to provide SDS for hazardous chemicals and employers to make them accessible to workers.

Question 55: To make sure they are providing the necessary protection against electrical shock, how frequently must electrical insulating gloves be tested?

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

Correct answer: Every six months

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

Question 56: Under OSHA 1926.34, what is the minimum clear width required for emergency egress routes on construction sites?

18 inches
36 inches
28 inches (Correct answer)
24 inches

Correct answer: 28 inches

OSHA 1926.34(a) requires that egress routes be wide enough for orderly exit — at minimum 28 inches clear width — and must be kept clear and unobstructed at all times.

Question 57: 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 58: 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)
Asbestosis
Lead poisoning
Carbon monoxide poisoning

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 59: A construction crew foreman witnesses a near-miss and decides not to report it to avoid paperwork. What systemic problem does this MOST likely reflect?

Inadequate personal protective equipment
Poorly designed engineering controls
Insufficient training on equipment operation
A punitive or blame-focused safety culture (Correct answer)

Correct answer: A punitive or blame-focused safety culture

Failure to report near-misses is a classic symptom of a punitive safety culture where workers fear reprisal; a just culture encourages reporting without blame.

Question 60: A construction crew is tasked with a non-routine, high-risk job of replacing a rooftop HVAC unit. What is the most appropriate safety management tool to use beforehand to systematically identify potential hazards and establish safe work procedures for this specific task?

A Job Hazard Analysis (JHA) or Job Safety Analysis (JSA). (Correct answer)
A weekly safety toolbox talk on general housekeeping.
A review of the company's Emergency Action Plan (EAP).
A post-incident investigation report.

Correct answer: A Job Hazard Analysis (JHA) or Job Safety Analysis (JSA).

A Job Hazard Analysis (JHA), also known as a Job Safety Analysis (JSA), is a technique that breaks a specific job down into its component steps to identify hazards before they occur and determine how to control them. This makes it the ideal tool for planning a non-routine, high-risk task.

Question 61: Which type of glove material provides the BEST protection against ketone solvents commonly found on construction sites?

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

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

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

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

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

Question 63: What is the most effective control to protect workers from being struck by vehicles in an active construction work zone?

Physical separation of worker zones from vehicle travel paths using concrete barriers or k-rail (Correct answer)
Requiring all workers to wear orange safety vests
Posting 'Workers Present' signage on approach roads
Scheduling vehicle deliveries during shift breaks

Correct answer: Physical separation of worker zones from vehicle travel paths using concrete barriers or k-rail

Physical barriers (engineering controls) provide positive separation between workers and moving vehicles, eliminating the hazard regardless of worker attention or driver behavior. High-vis vests (PPE) and signage (administrative) are lower on the hierarchy and depend on human compliance.

Question 64: How far must excavated soil and materials (spoil pile) be kept from the edge of an excavation under OSHA 1926.651?

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

Correct answer: At least 2 feet from the edge

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

Question 65: A construction site has 15 employees. An Emergency Action Plan (EAP) is required. Which of the following elements is a mandatory component of this plan according to 29 CFR 1926.35?

The home phone number of the company owner.
The plan must only be communicated orally to all employees.
A list of all combustible materials stored on site.
Procedures for employees who remain to operate critical equipment before they evacuate. (Correct answer)

Correct answer: Procedures for employees who remain to operate critical equipment before they evacuate.

According to 29 CFR 1926.35(b), an EAP must include several elements, one of which is 'Procedures to be followed by employees who remain to operate critical plant operations before they evacuate.' Because the site has more than 10 employees, the plan must be in writing and kept at the workplace.

Question 66: Which of the following best describes the primary role of communication in an effective Emergency Action Plan (EAP) on a construction site?

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

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

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

Question 67: A barrier analysis used in incident investigation focuses on:

Physical fences and guardrails that failed during the incident
Communication barriers between workers and supervisors
Language barriers that contributed to misunderstanding of safety instructions
Controls that should have prevented energy or hazard transfer to the worker and why they failed (Correct answer)

Correct answer: Controls that should have prevented energy or hazard transfer to the worker and why they failed

Barrier analysis examines the energy source, the target (worker), and the controls (barriers) that should have interrupted the hazardous energy transfer, assessing why each barrier failed.

Question 68: Under OSHA's excavation standard (29 CFR 1926 Subpart P), what is the maximum depth of an excavation before protective systems are required?

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

Correct answer: 5 feet

Protective systems such as sloping, shoring, or trench boxes are required for any excavation 5 feet or deeper, or shallower if the competent person determines a hazard exists.

Question 69: Before an authorized entrant enters a permit-required confined space, which atmospheric tests must be conducted?

Oxygen content only
Flammable gases only
Oxygen content, flammable gases, and toxic contaminants (Correct answer)
Carbon monoxide only

Correct answer: Oxygen content, flammable gases, and toxic contaminants

OSHA requires testing for oxygen content, flammable gases/vapors, and potential toxic air contaminants before entry to ensure all atmospheric hazards are identified.

Question 70: Which OSHA standard requires employers to develop and implement a written Respiratory Protection Program for construction workers using respirators?

29 CFR 1926.55
29 CFR 1926.103 (Correct answer)
29 CFR 1910.1000
29 CFR 1910.134

Correct answer: 29 CFR 1926.103

29 CFR 1926.103 is OSHA's construction industry respirator standard, which incorporates by reference the requirements of 1910.134 including the written program.

Question 71: According to OSHA, how often must a competent person inspect excavations where workers are exposed to hazards?

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

Correct answer: Daily and after every rainstorm

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

Question 72: When conducting a job hazard analysis (JHA), which step should be completed FIRST?

Break the job into sequential steps (Correct answer)
Assign a risk priority number to each step
Identify corrective actions for each hazard
Select the employees who will perform the task

Correct answer: Break the job into sequential steps

A JHA begins by breaking the job into its sequential basic steps before hazards can be identified or controls assigned.

Question 73: A construction safety manager wants to reduce struck-by incidents. Which hierarchy of controls approach is MOST preferred?

Physically separate workers from equipment travel paths using barriers (Correct answer)
Provide workers with high-visibility vests
Post warning signs in equipment operation zones
Train workers on spotting procedures

Correct answer: Physically separate workers from equipment travel paths using barriers

Engineering controls such as physical barriers rank higher than PPE or administrative controls in the hierarchy of controls.

Question 74: What is the purpose of a 'toolbox talk' (tailgate meeting) in construction safety management?

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

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

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

Question 75: Under the GHS-format SDS, which section contains exposure controls and personal protective equipment requirements?

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

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 76: What is the correct hierarchy of controls for chemical hazards, listed from most to least preferred?

Elimination → Substitution → Engineering → Administrative → PPE (Correct answer)
PPE → Administrative → Engineering → Substitution → Elimination
Engineering → Administrative → PPE → Substitution → Elimination
Administrative → Engineering → Substitution → PPE → Elimination

Correct answer: Elimination → Substitution → Engineering → Administrative → PPE

The hierarchy of controls prioritizes elimination first, followed by substitution, engineering controls, administrative controls, and PPE last.

Question 77: What is the minimum rated compressive strength concrete must achieve before formwork and shoring can be removed?

50% of 28-day design strength in all cases
The concrete must reach 3,000 psi regardless of design strength
Formwork may be removed 24 hours after pour completion
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 78: A CHST investigating a near-miss incident involving a scissor lift tip-over should use which root cause analysis method to identify systemic factors?

Safety walk-around checklist
5 Whys technique (Correct answer)
Pareto chart only
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 79: Under OSHA 1910.147, what is required before an authorized employee may restore energy to equipment after LOTO servicing is complete?

All tools and materials removed, all workers clear of the machine, and all LOTO devices removed by the employees who applied them before the energy-isolating device is operated (Correct answer)
The supervisor removes the lockout device on behalf of the crew
The safety officer certifies the repair is complete in writing
One authorized employee removes all locks and notifies the others

Correct answer: All tools and materials removed, all workers clear of the machine, and all LOTO devices removed by the employees who applied them before the energy-isolating device is operated

Before restoring energy, all nonessential items must be removed, all workers must be clear and notified, and each employee must remove their own lockout device before the energy-isolating device is operated.

Question 80: Which approach best describes the 'hierarchy of controls' when applied to a caught-in/caught-between hazard on a construction site?

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

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 81: According to OSHA 29 CFR 1926.503, fall protection training for construction workers must be conducted by:

Any experienced co-worker on the crew
The general contractor's HR department
A competent person qualified in fall protection (Correct answer)
A third-party OSHA-authorized trainer only

Correct answer: A competent person qualified in fall protection

OSHA 1926.503 requires that fall protection training be provided by a competent person with knowledge and ability in the subject.

Question 82: What is the main hazard associated with side-loading a crane boom?

It automatically triggers the anti-two-block device
It reduces ground bearing pressure under the outriggers
It can create lateral stress the boom was not designed to handle, leading to structural failure (Correct answer)
It causes excessive fuel consumption in the crane engine

Correct answer: It can create lateral stress the boom was not designed to handle, leading to structural failure

Side-loading applies lateral forces to the boom that exceed its design parameters, which can cause the boom to buckle or collapse catastrophically.

Question 83: A safety technician wants to evaluate whether a newly implemented fall-protection training program is achieving its intended outcomes. Which method provides the MOST objective measure of program effectiveness?

Surveying workers about their overall satisfaction with the training content
Tracking the number of training hours logged per worker over six months
Counting the number of safety signs and posters added to the site after training
Comparing incident rates and near-miss reports before and after the training rollout (Correct answer)

Correct answer: Comparing incident rates and near-miss reports before and after the training rollout

Outcome-based measurement using incident and near-miss data directly links the training intervention to changes in worker behavior and actual safety performance. Training hours, satisfaction surveys, and signage counts are process or perception metrics that do not confirm real risk reduction.

Question 84: A worker is exposed to isocyanate-containing spray foam insulation. What is the MOST serious potential long-term health effect?

Lead poisoning from catalyst compounds
Carbon monoxide poisoning from off-gassing
Silicosis from polyol filler particles
Occupational asthma from sensitization (Correct answer)

Correct answer: Occupational asthma from sensitization

Isocyanates are the leading cause of occupational asthma; once sensitized, a worker can experience severe asthma attacks at even trace concentrations.

Question 85: Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections are required in a Safety Data Sheet (SDS)?

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

Correct answer: 16 sections

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

Question 86: Under OSHA 1926.502, what is the minimum mid-rail height for a guardrail system?

18 inches
30 inches
Between 21 and 31 inches above the walking surface (Correct answer)
21 inches

Correct answer: Between 21 and 31 inches above the walking surface

The mid-rail must be positioned at approximately the midpoint between the top edge of the guardrail (42 inches) and the walking surface, which is between 21 and 31 inches.

Question 87: A utility strike occurs during excavation. Which action should be taken FIRST?

Continue excavating carefully by hand
Install additional shoring around the strike location
Stop work, remove workers, and notify the utility owner (Correct answer)
Call 811 (one-call center) immediately

Correct answer: Stop work, remove workers, and notify the utility owner

Worker safety is paramount — immediately stop work, evacuate all personnel, and then notify the utility company to assess and control the hazard.

Question 88: What is the purpose of an anti-two-block device on a crane?

To lock the swing brake when the operator leaves the cab
To limit the crane's maximum travel speed on the jobsite
To prevent the hook block from contacting the boom tip, which could cause the load line to fail (Correct answer)
To automatically level the crane on uneven terrain

Correct answer: To prevent the hook block from contacting the boom tip, which could cause the load line to fail

An anti-two-block device warns or stops the hoist when the hook block approaches the boom tip, preventing a two-block condition that could sever the wire rope and drop the load.

Question 89: Which OSHA standard governs the use of aerial lifts in construction?

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

Correct answer: 29 CFR 1926.453

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

Question 90: Which of the following events MUST be reported to OSHA within 24 hours (not 8 hours)?

An employee fatality
In-patient hospitalization of three or more employees
Loss of an eye
Amputation of a fingertip (Correct answer)

Correct answer: Amputation of a fingertip

Amputations and losses of an eye must be reported to OSHA within 24 hours, while fatalities and in-patient hospitalizations of any number trigger the 8-hour reporting requirement.

Question 91: Under the OSHA Heat Illness Prevention guidance, which physiological sign indicates heat stroke rather than heat exhaustion?

Nausea and headache with normal mentation
Altered mental status and hot, dry or wet skin (Correct answer)
Heavy sweating and pale, moist skin
Muscle cramps and weakness

Correct answer: Altered mental status and hot, dry or wet skin

Heat stroke, a medical emergency, is distinguished by central nervous system dysfunction (confusion, altered consciousness) and core body temperature above 104°F (40°C).

Question 92: A competent person inspects a tube-and-coupler scaffold and finds a coupler is cracked. What is the correct action?

Reinforce it with wire and document the finding
Report it to the supervisor but continue if no other defects exist
Tag it and continue using the scaffold carefully
Remove the cracked coupler immediately and replace it before use (Correct answer)

Correct answer: Remove the cracked coupler immediately and replace it before use

Damaged scaffold components must be removed immediately and replaced before the scaffold is used.

Question 93: When performing a pre-shift inspection, which wire rope condition requires immediate removal from service?

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

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 94: 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)
30 minutes
2 hours
4 hours

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

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

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

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

Question 96: In an excavation where oxygen deficiency or hazardous atmospheres could exist, what must be provided to workers before entry?

Hard hats and high-visibility vests only
A written evacuation plan posted at the site entrance
Atmospheric testing and appropriate respiratory protection (Correct answer)
Sunscreen and hydration stations

Correct answer: Atmospheric testing and appropriate respiratory protection

When hazardous atmospheres may be present in an excavation, atmospheric testing must be conducted and appropriate respiratory protection provided before workers enter.

Question 97: What is the PRIMARY reason for maintaining written safety training records on a construction project?

To provide evidence of corporate safety culture for marketing purposes
To justify reduced insurance premiums at the end of the policy period
To document compliance with regulatory requirements and verify worker qualifications (Correct answer)
To meet bonding requirements set by the project owner

Correct answer: To document compliance with regulatory requirements and verify worker qualifications

Training records serve as objective evidence that the employer met legal obligations under applicable OSHA standards and that workers held the required competencies for their tasks. This documentation is critical during inspections, incident investigations, and litigation.

Question 98: Under OSHA regulations, what must be done when a construction worker does not speak English and falls under a safety training requirement?

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

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

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

Question 99: Which type of scaffold is assembled from prefabricated tubular metal frames and is the most commonly used in US construction?

Fabricated frame scaffold (Correct answer)
Tube-and-coupler scaffold
System scaffold
Pump jack scaffold

Correct answer: Fabricated frame scaffold

Fabricated frame scaffolds (also called manufactured frame scaffolds) using prefabricated metal frames are the most common type used in US construction.

Question 100: Prior to each shift, what is the minimum inspection requirement for rigging equipment according to OSHA?

A thorough inspection by the site safety manager.
A documented inspection by a third-party inspector.
A visual inspection by a qualified rigger.
A visual inspection by the competent person using the equipment. (Correct answer)

Correct answer: A visual inspection by the competent person using the equipment.

OSHA 1926.251(a)(1) requires that rigging equipment for material handling shall be inspected prior to use on each shift and as necessary during its use by a competent person to ensure it is safe. Defective equipment must be removed from service.

Question 101: Which of the following BEST demonstrates that construction workers have retained and understood a safety training session?

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

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

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

Question 102: What is the required safe distance that unqualified workers must maintain from overhead power lines operating at 50kV on a construction site under OSHA 1926.416?

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

Correct answer: 15 feet

OSHA 1926.416 requires unqualified workers to stay at least 10 feet from lines up to 50kV; for 50kV, the distance increases to 15 feet.

Question 103: What is the primary purpose of a fire watch on a construction site after hot work operations have been completed?

To supervise the hot work permit process
To inspect fire extinguisher maintenance tags
To ensure no smoldering materials reignite after the work is finished (Correct answer)
To train workers on evacuation procedures

Correct answer: To ensure no smoldering materials reignite after the work is finished

A fire watch monitors the area for at least 30 minutes after hot work to detect and extinguish any smoldering materials that could reignite.

Question 104: 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:

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

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 105: During lead abatement activities involving manual scraping of lead-based paint, which of the following housekeeping practices is explicitly prohibited by OSHA's Lead in Construction standard (29 CFR 1926.62)?

Using a HEPA-filtered vacuum for cleanup.
Placing contaminated clothing in sealed containers.
Wet-sanding the painted surfaces.
Using compressed air to remove lead dust from surfaces. (Correct answer)

Correct answer: Using compressed air to remove lead dust from surfaces.

OSHA standard 29 CFR 1926.62(h)(5) prohibits the use of compressed air to remove lead from any surface unless it is used with a ventilation system designed to capture the dust. This practice is banned because it disperses hazardous lead dust into the air, increasing the risk of inhalation. HEPA vacuuming, wet methods, and proper disposal of contaminated clothing are all required or recommended practices.

Question 106: A competent person inspects a personal fall arrest system after an employee experiences a fall. What action is required?

The system must be removed from service immediately (Correct answer)
The system may be reused after visual inspection
The system needs re-inspection within 30 days
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 107: A group lockout/tagout procedure is being used on a construction project. What is the primary responsibility of the authorized employee in charge?

Training new employees on general site safety
Ensuring that all members of the group are protected throughout the lockout and coordinating the application and removal of lockout devices (Correct answer)
Purchasing the correct locks for the crew
Scheduling the maintenance window with the client

Correct answer: Ensuring that all members of the group are protected throughout the lockout and coordinating the application and removal of lockout devices

The authorized employee in charge of a group lockout must ensure continuity of protection for all workers and coordinate the overall lockout/tagout effort.

Question 108: A CHST observes a worker using a portable electric tool on a construction site without a GFCI. Which OSHA standard is being violated?

29 CFR 1926.502(d)
29 CFR 1910.333(a)
29 CFR 1910.147(c)(1)
29 CFR 1926.404(b)(1) (Correct answer)

Correct answer: 29 CFR 1926.404(b)(1)

OSHA 1926.404(b)(1) requires ground-fault circuit interrupter protection or an assured equipment grounding conductor program for temporary wiring on construction sites.

Question 109: A construction worker is exposed to isocyanate-containing spray foam. Which type of respirator provides the MINIMUM required protection during application?

A powered air-purifying respirator (PAPR) with HEPA filters only
A supplied-air respirator (SAR) in positive-pressure mode (Correct answer)
A disposable N95 filtering facepiece
A half-face air-purifying respirator with organic vapor cartridges

Correct answer: A supplied-air respirator (SAR) in positive-pressure mode

Isocyanates are highly sensitizing; OSHA and NIOSH recommend supplied-air respirators in positive-pressure mode because organic vapor cartridges may not provide adequate protection at low concentrations.

Question 110: Which anchor point characteristic is required for attaching a personal fall arrest system under OSHA standards?

Capable of supporting 7,500 lbs per attached worker
Capable of supporting 5,000 lbs per attached worker (Correct answer)
Capable of supporting 1,800 lbs per attached worker
Capable of supporting 3,600 lbs per attached worker

Correct answer: Capable of supporting 5,000 lbs per attached worker

OSHA requires anchor points for personal fall arrest systems to support at least 5,000 lbs per worker attached, or be designed by a qualified person with a safety factor of at least two.

Question 111: A CHST notices workers using spray-applied coatings containing silica in an enclosed space without respiratory protection. The MOST appropriate corrective action is to:

Increase general ventilation by opening one additional door
Stop work immediately, evacuate the space, and implement engineering controls and proper respiratory protection before resuming (Correct answer)
Post warning signs and allow work to continue until end of shift
Provide half-face respirators with N95 filters to all workers and allow work to resume

Correct answer: Stop work immediately, evacuate the space, and implement engineering controls and proper respiratory protection before resuming

Respirable crystalline silica causes silicosis and lung cancer; OSHA's silica standard (29 CFR 1926.1153) requires immediate controls including stopping work if workers are exposed above the action level without protection.

Question 112: What information is NOT required on an OSHA-compliant confined space entry permit?

Authorized entrants and the entry supervisor
The hazards of the permit space and measures to eliminate or control them
The employer's general liability insurance policy number (Correct answer)
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 113: During a safety meeting, a worker raises a concern about a trench shoring method but is dismissed by the supervisor. What is the primary risk of this communication failure?

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

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

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

Question 114: Which factor most directly determines the required travel distance to a fire extinguisher on a construction site for Class B hazards?

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

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 115: Which class of fire involves energized electrical equipment?

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

Correct answer: Class C

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

Question 116: Which of the following BEST describes the primary purpose of a construction safety program audit or evaluation?

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

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

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

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

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

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

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

Question 119: Which of the following rescue methods is always preferred over all others for confined space rescue per OSHA regulations?

Non-entry retrieval using mechanical means (Correct answer)
Mutual aid rescue by neighboring contractor teams
Emergency services (fire department) rescue
Entry rescue by a trained employer rescue team

Correct answer: Non-entry retrieval using mechanical means

OSHA requires that non-entry retrieval be used whenever it is feasible, because it protects rescuers from entering the hazardous space.

Question 120: What does 'safety culture' refer to in construction safety program management?

The shared values, beliefs, norms, and behaviors regarding safety in an organization — including how leadership's visible commitment influences worker behavior and incident rates (Correct answer)
Whether workers have completed OSHA 10 or OSHA 30 training
The organization's OSHA compliance record and number of citations
The number of safety posters displayed on the job site

Correct answer: The shared values, beliefs, norms, and behaviors regarding safety in an organization — including how leadership's visible commitment influences worker behavior and incident rates

Safety culture refers to deep, shared organizational values and norms about safety — including management commitment, worker trust, and behavioral norms that collectively determine how safely people work even when no one is watching.

Question 121: What hazard does an uncontrolled release of stored energy pose during an emergency evacuation on a construction site?

Increased insurance premiums
Noise complaints from neighboring properties
Delays in project scheduling
Risk of unexpected equipment movement, electrical discharge, or pressure release injuring evacuating workers (Correct answer)

Correct answer: Risk of unexpected equipment movement, electrical discharge, or pressure release injuring evacuating workers

Uncontrolled stored energy can cause unexpected equipment activation, electrical shock, or pressure release that endangers workers during an evacuation.

Question 122: A contractor is working at heights and must decide between a personal fall arrest system and a positioning device. What is the key functional difference?

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

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

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

Question 123: 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 concentration at which medical surveillance, exposure monitoring, and preventive programs are required — typically set at half the PEL (Correct answer)
The same concentration as the PEL
The concentration at which work must immediately stop

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

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

Question 124: What role does a site-specific safety plan play in construction safety communication?

It is only required for government-funded projects
It replaces the need for daily toolbox talks and orientations
It is a voluntary document with no regulatory significance
It serves as the foundational document that outlines hazards, controls, and emergency procedures for the specific project (Correct answer)

Correct answer: It serves as the foundational document that outlines hazards, controls, and emergency procedures for the specific project

The site-specific safety plan is the foundational communication document that identifies project-specific hazards, required controls, emergency procedures, and safety responsibilities for all site personnel.

Question 125: What is the minimum Assigned Protection Factor (APF) required for a half-face air-purifying respirator?

10 (Correct answer)
25
50
5

Correct answer: 10

OSHA assigns a protection factor of 10 to half-face air-purifying respirators, meaning they reduce airborne contaminant concentration by a factor of 10.

Question 126: Which chemical agent is prohibited for use in fighting fires involving reactive metals such as magnesium or titanium found on some construction sites?

Foam
Water (Correct answer)
Carbon dioxide (CO2)
Class D dry powder agent

Correct answer: Water

Water reacts violently with burning reactive metals, potentially causing explosions or spreading the fire; only Class D agents are appropriate.

Question 127: 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:

Analyze which job tasks, crews, and locations are associated with the fall injuries to target training and controls (Correct answer)
Immediately purchase new fall arrest equipment for all workers without further analysis
Suspend all work at height until an OSHA inspection is requested
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 128: Under OSHA's fall protection standards for construction, which activity has a fall protection trigger height of 6 feet?

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

Correct answer: Leading edge work

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

Question 129: Under OSHA 1926.59 (Hazard Communication for construction), which of the following is a required element of a GHS-compliant chemical label?

CAS number, LD50, boiling point, and flashpoint
Only the chemical name and NFPA diamond rating
SDS number, product code, and emergency phone number only
Signal word ('Danger' or 'Warning'), hazard pictograms, hazard statements, precautionary statements, product identifier, and supplier information (Correct answer)

Correct answer: Signal word ('Danger' or 'Warning'), hazard pictograms, hazard statements, precautionary statements, product identifier, and supplier information

GHS labels under OSHA's HazCom standard must include: product identifier, signal word, hazard pictograms, hazard statements, precautionary statements, and supplier information including name and address.

Question 130: What is the maximum noise exposure allowed by OSHA for an 8-hour workday without hearing protection?

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

Correct answer: 90 dBA

OSHA's permissible exposure limit (PEL) for noise is 90 dBA as an 8-hour time-weighted average (TWA) under 29 CFR 1926.52.

Question 131: When is a safety monitoring system (SMS) an acceptable sole means of fall protection on a low-slope roof?

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

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 132: Which exposure route is MOST significant for lead exposure on construction sites involving lead-based paint removal?

Dermal absorption through intact skin
Ingestion via hand-to-mouth contact (Correct answer)
Injection through puncture wounds
Eye contact with lead dust

Correct answer: Ingestion via hand-to-mouth contact

On construction sites, lead ingestion through hand-to-mouth contact (e.g., eating, drinking, or smoking without washing hands) is the primary route of entry for lead dust and fume particles.

Question 133: What must be done before excavation work begins near underground utilities under OSHA 1926.651(b)(3)?

Contact utility companies and use detection equipment to determine the location of underground utilities (Correct answer)
Utilities only need to be marked if the excavation is deeper than 5 feet
Assume utilities are absent if no records exist
Dig slowly and stop if you hear or feel any resistance

Correct answer: Contact utility companies and use detection equipment to determine the location of underground utilities

OSHA 1926.651(b)(3) requires that the approximate location of underground utilities be determined before opening an excavation, using utility notification systems (811 call), records, and detection equipment.

Question 134: A safety technician is tasked with selecting a leading indicator to track daily. Which choice provides the MOST actionable real-time safety data?

Monthly lost-time injury frequency rate
Daily percentage of pre-task planning forms completed before work begins (Correct answer)
Quarterly workers' compensation experience modification rate (EMR)
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 135: An employer has several workers who will be exposed to fall hazards on a new construction project. According to OSHA 1926.503, when must the employer provide fall protection training?

Within the first week of exposure to the fall hazard.
When an employee's performance shows a lack of understanding.
Before any employee is exposed to a fall hazard. (Correct answer)
Only after a near-miss or incident occurs.

Correct answer: Before any employee is exposed to a fall hazard.

OSHA standard 1926.503(a)(1) explicitly states that the employer shall provide a training program for each employee who might be exposed to fall hazards. The training must enable each employee to recognize the hazards of falling and to know the procedures to be followed in order to minimize these hazards. This training must be provided before the employee is exposed to the hazard.

Question 136: A contractor is excavating a trench that will be 22 feet deep. Which of the following is required for the protective system design?

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

Correct answer: Design by a registered professional engineer.

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

Question 137: Which of the following is considered the LEAST effective method for controlling workplace hazards according to the hierarchy of controls?

Engineering controls
Personal Protective Equipment (PPE) (Correct answer)
Administrative controls
Substitution

Correct answer: Personal Protective Equipment (PPE)

The hierarchy of controls ranks hazard control methods from most to least effective. The order is: Elimination, Substitution, Engineering Controls, Administrative Controls, and finally, Personal Protective Equipment (PPE). PPE is considered the last line of defense because it relies on the worker to wear and use it correctly and does not remove the hazard from the environment.

Question 138: Under OSHA's lead standard for construction (29 CFR 1926.62), the action level (AL) for lead exposure is:

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

Correct answer: 25 µg/m³ as an 8-hour TWA

The action level for lead in construction is 25 µg/m³ as an 8-hour time-weighted average, which triggers medical surveillance and monitoring requirements.

Question 139: 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 support adjacent structures above the trench
To classify the soil type before excavation
To prevent groundwater infiltration

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 140: What is the OSHA permissible exposure limit (PEL) for benzene in construction as an 8-hour TWA?

0.5 ppm
1 ppm (Correct answer)
10 ppm
5 ppm

Correct answer: 1 ppm

OSHA's PEL for benzene is 1 ppm as an 8-hour TWA (29 CFR 1910.1028, adopted by construction), with an action level of 0.5 ppm.

Question 141: Under OSHA 29 CFR 1904.7, which of the following criteria makes an injury or illness recordable on the OSHA 300 Log?

Only injuries that cause missed work time
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)
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 142: Under OSHA's Hazard Communication Standard (HazCom 2012), when must workers be trained on newly identified chemical hazards?

Before they work with the new hazardous chemical (Correct answer)
Within 30 days of the new chemical's introduction
At the next scheduled annual training session
Within 90 days of receipt of the new SDS

Correct answer: Before they work with the new hazardous chemical

OSHA requires workers to be trained on new hazardous chemicals before they are exposed to them, not on a delayed schedule.

Question 143: What is the PRIMARY benefit of integrating behavior-based safety (BBS) observations into a construction safety program?

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

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

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

Question 144: Under OSHA's Hazard Communication Standard (1910.1200 / 1926.59), when must employers provide chemical training when a new physical or health hazard is introduced to the workplace?

During the next scheduled annual safety training session
Before workers are first exposed to the new chemical hazard or before the chemical is introduced into their work area (Correct answer)
Workers must self-study the SDS and sign a form acknowledging receipt
Only if the new chemical has an OSHA Permissible Exposure Limit

Correct answer: Before workers are first exposed to the new chemical hazard or before the chemical is introduced into their work area

OSHA 1910.1200(h)(1) requires training before workers are first exposed to a hazardous chemical, and 1910.1200(h)(3) requires training whenever a new physical or health hazard is introduced to the work area.

Question 145: Which sign and symptom combination is the cardinal indicator that distinguishes heat stroke from heat exhaustion?

Core body temperature between 100°F and 103°F with headache only
Muscle cramps in the legs and abdomen with normal temperature
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 146: An electrician is preparing to work on a 480-volt motor control center. After shutting off the main breaker that supplies the MCC, what is the most critical next step they must perform before beginning work?

Complete the Energized Electrical Work Permit.
Apply their personal lock and tag to the breaker.
Notify affected employees that work is beginning.
Verify the absence of voltage using a test instrument. (Correct answer)

Correct answer: Verify the absence of voltage using a test instrument.

According to OSHA 1926.417 and NFPA 70E, after an energy isolating device is operated, the most critical step is to verify with a properly rated test instrument that the circuit and equipment parts are de-energized. This step ensures that the circuit is truly dead before any contact is made, protecting against mistakes in identifying the circuit, stored energy, or induced voltage.

Question 147: When conducting a Job Hazard Analysis (JHA), what is the FIRST step in the process?

Determine corrective actions
Select the job to be analyzed (Correct answer)
List the steps of the job in sequence
Identify hazards associated with each step

Correct answer: Select the job to be analyzed

The first step in a JHA is selecting which job to analyze, typically prioritizing jobs with high injury rates or serious potential hazards.

Question 148: What is the minimum bearing capacity required for mudsills placed under scaffold base plates on soft soil?

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

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 149: What must an employer provide if a PFAS cannot be used during steel erection and guardrails are not feasible?

Safety nets or a positioning device system (Correct answer)
An administrative control plan only
A safety monitor and warning line system
Written documentation of the infeasibility

Correct answer: Safety nets or a positioning device system

When conventional fall protection is infeasible in steel erection, safety nets or positioning device systems are the required alternative.

Question 150: What is the purpose of a Toolbox Talk (TBT) on a construction site?

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

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 151: A safety program's corrective action tracking log shows 40% of actions are overdue. What is the FIRST step a safety manager should take?

Replace the tracking system with a new software platform
Analyze why actions are overdue: resource constraints, unclear ownership, or unrealistic deadlines (Correct answer)
Escalate every overdue item directly to OSHA for guidance
Close all overdue items as 'resolved' to reset the metric

Correct answer: Analyze why actions are overdue: resource constraints, unclear ownership, or unrealistic deadlines

Understanding the root causes of overdue corrective actions — such as resource gaps or unclear accountability — is necessary before implementing any effective solution.

Question 152: The OSHA 300A Annual Summary must be posted during which period and signed by whom?

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

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

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

Question 153: Which of the following is the primary purpose of conducting an incident investigation on a construction site?

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

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

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

Correct answer: 1.5H:1V (34°)

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

Question 155: Under OSHA 1926.403, what is the minimum clearance required between energized electrical conductors operating at 50 kV and unqualified workers?

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

Correct answer: 10 feet

OSHA requires unqualified workers to maintain at least 10 feet of clearance from overhead lines up to 50 kV.

Question 156: Which type of fire extinguisher should be used on energized electrical equipment fires?

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

Correct answer: Class C

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

Question 157: Which approach BEST demonstrates the hierarchy of controls when managing silica dust exposure during concrete cutting on a construction site?

Scheduling cutting operations during lunch breaks when fewer workers are present
Providing N95 respirators to all workers in the area
Using a wet-cutting method with integrated water suppression (Correct answer)
Posting warning signs around the cutting area

Correct answer: Using a wet-cutting method with integrated water suppression

Wet-cutting is an engineering control that eliminates silica dust at the source, which ranks higher on the hierarchy of controls than PPE, warnings, or administrative scheduling.

Question 158: A safety technician calculates the required attenuation for hearing protection in an area with an A-weighted Time-Weighted Average (TWA) noise exposure of 102 dBA. The company policy is to use OSHA's standard formula for estimating workplace protection. If a worker uses earplugs with a Noise Reduction Rating (NRR) of 33, what is the estimated exposure in dBA under the protector?

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

Correct answer: 76 dBA

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

Question 159: During a site walk, a safety technician observes a heavy tool fall from an upper level, landing just a few feet from a worker. No one was injured. Why is it crucial to investigate this "near miss"?

It must be recorded on the OSHA 300 Log as a preventative measure.
It is necessary for disciplining the worker who dropped the tool.
It provides an opportunity to identify and correct system failures before they cause an injury. (Correct answer)
It is required to be reported to OSHA within 24 hours.

Correct answer: It provides an opportunity to identify and correct system failures before they cause an injury.

A near miss is an indicator of a weakness in the safety system that could lead to a serious incident. Investigating it with the same rigor as an accident allows the company to identify root causes and implement corrective actions proactively, preventing a future event where an injury or property damage occurs. Near misses are not reportable to OSHA or recordable on the 300 Log unless an injury meeting the criteria occurs.

Question 160: What does the term 'competent person' mean under OSHA construction standards?

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

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

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

Question 161: During a critical lift, who must review and approve the lift plan?

The site superintendent alone
A qualified rigger and a qualified signal person
A qualified person or licensed PE (Correct answer)
The crane operator

Correct answer: A qualified person or licensed PE

Critical lifts require a pre-lift plan reviewed and approved by a qualified person, and in some jurisdictions a licensed professional engineer.

Question 162: According to OSHA standards, what is the minimum number of exit routes required for most construction workplaces?

Two (Correct answer)
Four
Three
One

Correct answer: Two

OSHA requires at least two exit routes in a workplace to ensure workers can evacuate even if one route is blocked.

Question 163: A safety program audit reveals that toolbox talks are being conducted but attendance is inconsistent. What is the BEST corrective action?

Reduce the frequency of toolbox talks to improve attendance rates
Eliminate toolbox talks and replace with monthly safety meetings
Post toolbox talk topics on the bulletin board instead
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 164: A construction worker is exposed to a chemical with a vapor pressure of 450 mmHg at 20°C. What does this indicate about the hazard?

The chemical has low flammability
The chemical is a solid at room temperature
The chemical evaporates rapidly and can quickly reach hazardous air concentrations (Correct answer)
The chemical has a very high flash point

Correct answer: The chemical evaporates rapidly and can quickly reach hazardous air concentrations

A high vapor pressure means the chemical evaporates quickly, which can rapidly produce hazardous airborne concentrations in enclosed or poorly ventilated spaces.

Question 165: On a construction site, a Safety and Health Program must include which of the following four core elements according to OSHA guidelines?

Subcontractor oversight, safety incentive programs, drug testing, and return-to-work policies
Management leadership, worker participation, hazard identification, hazard prevention and control (Correct answer)
Incident investigation, training, PPE issuance, emergency response planning
Toolbox talks, daily inspections, OSHA 300 log maintenance, SDS management

Correct answer: Management leadership, worker participation, hazard identification, hazard prevention and control

OSHA's Recommended Practices for Safety and Health Programs identify four core elements: management leadership, worker participation, hazard identification and assessment, and hazard prevention and control. These form the foundation of an effective safety management system.

Question 166: 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 1926.200
29 CFR 1926.1153 (Correct answer)
29 CFR 1926.62

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 167: Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections are required in a Safety Data Sheet (SDS)?

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

Correct answer: 16 sections

OSHA's HazCom 2012, aligned with GHS, mandates a standardized 16-section format for all Safety Data Sheets.

Question 168: During fall protection training, workers should be taught that the total fall distance in a PFAS includes which components?

Free fall distance plus deceleration distance only
Free fall distance plus deceleration distance plus the worker's height plus a safety margin (Correct answer)
Free fall distance only
Deceleration distance plus the height of the anchor above grade

Correct answer: Free fall distance plus deceleration distance plus the worker's height plus a safety margin

Total fall distance includes free fall, deceleration distance, and the worker's height (D-ring to feet), plus a safety factor to ensure the worker does not contact a lower level.

Question 169: Which type of incident investigation technique uses a diagram that works backward from the loss event to identify all contributing causes and their relationships?

Bowtie analysis
Fault tree analysis (Correct answer)
5-Why method
Fishbone diagram

Correct answer: Fault tree analysis

Fault tree analysis uses a top-down logic diagram starting from the undesired event and working backward through contributing causes using Boolean logic gates.

Question 170: A safety technician observes workers using a powder-actuated tool without wearing hearing protection. Under OSHA standards, this tool requires hearing protection because noise levels typically exceed:

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

Correct answer: 90 dBA

OSHA's 1926.52 action level is 90 dBA for an 8-hour TWA; powder-actuated tools often exceed this threshold.

Question 171: Which OSHA standard governs the hazard communication program for construction worksites?

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

Correct answer: 29 CFR 1926.59

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

Question 172: As the angle between two sling legs increases (the legs spread farther apart), what happens to the tension in each sling leg for the same load?

Tension stays constant regardless of angle
Tension only changes when the angle exceeds 90 degrees
Tension in each leg increases as the angle between the legs increases (Correct answer)
Tension in each leg decreases as the angle increases

Correct answer: Tension in each leg increases as the angle between the legs increases

As the sling angle (measured from horizontal) decreases or the included angle between legs increases, sling leg tension increases dramatically due to force vector geometry — this is known as the sling angle factor.

Question 173: What is the purpose of an 'equipment-specific' LOTO procedure as opposed to a general LOTO procedure?

To satisfy recordkeeping requirements only
To authorize less-trained workers to perform lockout
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

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 174: In the context of construction site emergency planning, what does the term 'impairment' refer to?

Lack of proper PPE during emergency response
Any condition that renders a fire protection system inoperable or reduced (Correct answer)
A worker affected by substances during an emergency
Structural damage caused by a fire event

Correct answer: Any condition that renders a fire protection system inoperable or reduced

Impairment refers to any condition—planned or unplanned—that takes a fire protection system out of normal service.

Question 175: 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?

Implementing job rotation to limit each worker's cutting time to two hours.
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.

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

30 (Correct answer)
25
20
40

Correct answer: 30

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

Question 177: What is the minimum approach distance for an unqualified worker near exposed energized parts operating at 50 kV on a construction site per OSHA 1926 Subpart K?

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

Correct answer: 10 feet

OSHA 1926.416 requires unqualified workers to maintain at least 10 feet from exposed energized conductors or parts rated up to 50 kV.

Question 178: A CHST reviews a material safety data sheet and finds the flash point of a solvent is 70°F. How should this material be classified?

Explosive material
Flammable liquid (Correct answer)
Non-flammable liquid
Combustible liquid

Correct answer: Flammable liquid

OSHA defines flammable liquids as those with a flash point below 100°F (37.8°C); a flash point of 70°F clearly qualifies as flammable.

Question 179: Under OSHA 1926.150, which type of fire extinguisher is appropriate for a Class B (flammable liquid) fire on a construction site?

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

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

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

Correct answer: 6 feet

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

Question 181: According to OSHA's 29 CFR 1926.503, construction workers who work at heights must receive fall protection training from a:

OSHA-certified instructor
Competent person (Correct answer)
Qualified person
Licensed safety professional

Correct answer: Competent person

OSHA 1926.503 requires that fall protection training be provided by a competent person who is knowledgeable about fall hazards and prevention methods.

Question 182: 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
The competent person performing the pre-shift inspection
Personnel who attach or detach rigging to a load (Correct answer)

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 183: Under OSHA's Hazard Communication Standard (HazCom 2012 / GHS), what training must workers receive when a new chemical hazard is introduced to the workplace?

Training on the new hazard must be provided before workers are exposed to it (Correct answer)
Training is required only if the chemical has an IDLH concentration
Training may be deferred until the next scheduled quarterly safety meeting
Workers need only be directed to read the SDS independently

Correct answer: Training on the new hazard must be provided before workers are exposed to it

HazCom requires that workers receive training on new chemical hazards before exposure, ensuring informed protection from the outset.

Question 184: When evaluating a construction site's safety program, a CHST finds the experience modification rate (EMR) is 1.35. What does this indicate?

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

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 185: 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?

Zero energy state
Tagout
Lockout (Correct answer)
Blockout

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 186: A construction site experiences an electrical fatality. Under OSHA 29 CFR 1904.39, within what timeframe must the employer report the fatality to OSHA?

Within 24 hours of the incident
Immediately upon discovery, no time limit
Within 3 business days of the fatality
Within 8 hours of learning of the fatality (Correct answer)

Correct answer: Within 8 hours of learning of the fatality

OSHA 1904.39 requires employers to report any work-related fatality to OSHA within 8 hours of learning that the fatality occurred.

Question 187: What is the purpose of a 'Behavior-Based Safety' (BBS) program, and what is its primary criticism from safety professionals?

BBS programs are an OSHA-mandated element of safety management
BBS programs only apply to manufacturing, not construction
BBS focuses on observing and reinforcing safe worker behaviors; the primary criticism is that it focuses on individual worker behavior while potentially deflecting attention from systemic hazards and management failures (Correct answer)
BBS programs are universally accepted as the single most effective safety intervention with no significant criticisms

Correct answer: BBS focuses on observing and reinforcing safe worker behaviors; the primary criticism is that it focuses on individual worker behavior while potentially deflecting attention from systemic hazards and management failures

BBS programs observe worker behavior and provide feedback to reinforce safe behaviors. Critics argue they focus disproportionately on worker behavior rather than addressing systemic and management-level root causes.

Question 188: Which type of anchorage is required when two workers use the same anchor point for a personal fall arrest system?

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

Correct answer: A 10,000-lb rated anchor

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

Question 189: Under OSHA 1926.1425, when are tag lines required during crane lift operations?

Only when lift height exceeds 20 feet
When the load must be controlled to prevent rotation, swinging, or uncontrolled movement that could endanger workers (Correct answer)
Only when loads exceed 1,000 lbs
Only when wind speed exceeds 15 mph

Correct answer: When the load must be controlled to prevent rotation, swinging, or uncontrolled movement that could endanger workers

Tag lines are required when the load might rotate, swing, or otherwise move in an uncontrolled manner that could endanger employees — not based on a fixed weight or height threshold.

Question 190: Which OSHA standard specifically addresses the Hazard Communication requirements for chemical health hazards on construction sites?

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

Correct answer: 29 CFR 1926.59

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

Question 191: What is the minimum tensile strength required for lifelines used in personal fall arrest systems under OSHA 1926.502?

3,000 pounds
5,000 pounds (Correct answer)
4,000 pounds
2,500 pounds

Correct answer: 5,000 pounds

OSHA requires lifelines to have a minimum breaking strength of 5,000 pounds.

Question 192: What area of the body receives the least amount of meaningful fall arrest force from a body harness?

Lower back (Correct answer)
Shoulders
Pelvis
Thighs

Correct answer: Lower back

The part of a personal fall system that fastens to the worker is called a body harness. To securely distribute the forces required to halt a fall, the harness is made up of a number of straps that wrap over the thighs, pelvis, chest, and shoulders.

Question 193: According to OSHA confined space standards, which of the following is NOT a required element of a permit-required confined space entry permit?

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

Correct answer: Workers' compensation insurance policy number

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

Question 194: What is the primary purpose of Lockout/Tagout (LOTO) procedures under OSHA 29 CFR 1910.147?

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

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

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

Question 195: What is the purpose of a 'try-out' (or test) step after applying lockout to a machine?

To verify the machine cannot be started before work begins (Correct answer)
To confirm the lock is properly seated on the hasp
To test the emergency stop button operation
To check that all affected employees have been notified

Correct answer: To verify the machine cannot be started before work begins

The try-out step verifies the energy isolation was successful by attempting to start or operate the equipment before performing maintenance.

Question 196: 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?

Revise and expand the new-hire and task-specific training programs (Correct answer)
Increase the frequency of random drug testing
Purchase additional PPE for high-risk tasks
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 197: According to OSHA 29 CFR 1926.502, at what height must fall protection be provided for employees on walking/working surfaces with unprotected sides or edges in construction?

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

Correct answer: 6 feet

OSHA requires fall protection in construction at 6 feet above a lower level per 29 CFR 1926.502.

Question 198: What does the hierarchy of controls prescribe as the MOST effective method to reduce workplace hazards?

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

Correct answer: Elimination

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

Question 199: Under OSHA 1926.251(c)(3), what is the required design factor for wire rope slings used in rigging operations?

4:1
3:1
2:1
5:1 (the minimum breaking force must be at least 5 times the rated capacity) (Correct answer)

Correct answer: 5:1 (the minimum breaking force must be at least 5 times the rated capacity)

OSHA 1926.251(c)(3) and ASME B30.9 require a design factor of 5:1 for wire rope slings — the rated capacity of the sling must not exceed one-fifth of the minimum breaking force of the wire rope used.

Question 200: The OSHA 301 Injury and Illness Incident Report must be completed within how many calendar days of a recordable incident?

15 days
24 hours
30 days
7 days (Correct answer)

Correct answer: 7 days

OSHA requires the 301 form (or equivalent) to be completed within 7 calendar days after the employer learns of a recordable work-related injury or illness.

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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