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

Question 1: What is the maximum allowable body wear (reduction in original rope diameter) that causes a wire rope to be removed from service under ASME B30.2?

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

Correct answer: One-third (33%) reduction

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

Question 2: Which of the following DOES NOT play a key role in figuring out how an electrocution event may affect a worker?

The path through the body the current takes
The amount of electrical current passing through the body
The amount of electrically resistant material present in work boots and work gloves (Correct answer)
The length of time an exposure to electricity occurs

Correct answer: The amount of electrically resistant material present in work boots and work gloves

The amount of current that flows through the body, the amount of time that a person is exposed to the current, and the precise direction the current follows all play a role in how an electrocution occurrence turns out.

Question 3: 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 4: The primary purpose of a Job Hazard Analysis (JHA) is to:

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

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 5: 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?

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

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 6: What is the primary purpose of a Job Hazard Analysis (JHA)?

To assign blame after an incident occurs
To train new employees on company policies
To identify hazards before a task begins and establish controls (Correct answer)
To satisfy OSHA recordkeeping requirements

Correct answer: To identify hazards before a task begins and establish controls

A JHA proactively identifies hazards associated with specific job tasks so controls can be implemented before work starts.

Question 7: Which color is OSHA-recommended for danger tags used in a tagout procedure?

Yellow
Red (Correct answer)
Blue
Orange

Correct answer: Red

OSHA specifies that danger tags used for tagout must be red and must warn against hazardous conditions if the equipment is energized.

Question 8: What is the maximum allowable slope ratio for Type B soil in an excavation less than 20 feet deep?

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

Correct answer: 1-1/2H:1V

Type B soil requires a maximum allowable slope of 1-1/2 horizontal to 1 vertical (53 degrees) for excavations under 20 feet.

Question 9: Which type of fire extinguisher is appropriate for energized electrical equipment fires on a construction site?

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

Correct answer: Class C

Class C extinguishers use non-conductive agents suitable for energized electrical equipment fires.

Question 10: A construction safety manager wants to reduce struck-by incidents. Which hierarchy of controls approach is MOST preferred?

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

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

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

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

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

Question 12: What is the OSHA-required minimum distance that a scaffold must be erected from an energized power line rated at 50 kV or less?

6 feet
10 feet (Correct answer)
3 feet
20 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 13: Under OSHA 1926.502, what is the minimum tensile strength required for a personal fall arrest system's body harness?

5,000 lbs
3,000 lbs
1,800 lbs
2,500 lbs (Correct answer)

Correct answer: 2,500 lbs

OSHA 1926.502(d)(16) requires that each body harness component used in a personal fall arrest system be capable of withstanding a tensile strength of 2,500 lbs applied and sustained for one minute.

Question 14: What is the purpose of a tag line during a crane lift?

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

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

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

Question 15: A construction worker needs to work inside an electrical panel. After de-energizing and locking out, which test confirms zero energy state?

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

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

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

Question 16: Which of the following is a key requirement for an employee to be considered a 'qualified person' for performing electrical work, according to the OSHA 1926 construction standards?

Having training and experience to recognize and avoid the specific electrical hazards involved. (Correct answer)
Holding a valid state electrician's license.
Having successfully completed a four-year apprenticeship.
Possessing a degree in electrical engineering.

Correct answer: Having training and experience to recognize and avoid the specific electrical hazards involved.

OSHA's definition in 1926.32(m) defines a qualified person as one who, through recognized degree, certificate, or professional standing, or by extensive knowledge, training, and experience, has demonstrated the ability to solve problems relating to the work. The critical element is the demonstrated ability and specific training to identify and avoid the hazards associated with the task, not just a general credential.

Question 17: What should be the first action of a construction worker who discovers a fire that cannot be immediately controlled with a portable extinguisher?

Activate the fire alarm and evacuate the area (Correct answer)
Attempt to fight the fire with available materials
Continue working and monitor the fire
Search for a larger extinguisher

Correct answer: Activate the fire alarm and evacuate the area

When a fire cannot be immediately controlled, the priority is to alert others by activating the alarm and evacuating to prevent injuries.

Question 18: What is the purpose of a 'pre-task planning' process (Activity Hazard Analysis / AHA) in construction?

To review completed work for quality control before the next phase begins
To estimate labor costs and schedule durations for upcoming tasks
To identify hazards specific to an upcoming task before work begins, assign controls for each hazard, and communicate expectations to all workers performing the task (Correct answer)
To document worker qualifications and certifications for a specific task

Correct answer: To identify hazards specific to an upcoming task before work begins, assign controls for each hazard, and communicate expectations to all workers performing the task

Pre-task planning identifies hazards for the specific upcoming work, assigns controls, and communicates the safety plan to workers before they begin — preventing incidents through proactive hazard management.

Question 19: 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 is a solid at room temperature
The chemical has low flammability
The chemical has a very high flash point
The chemical evaporates rapidly and can quickly reach hazardous air concentrations (Correct answer)

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 20: Which federal agency is primarily responsible for enforcing workplace safety and health standards in the construction industry?

MSHA
NIOSH
OSHA (Correct answer)
EPA

Correct answer: OSHA

OSHA (Occupational Safety and Health Administration) is the federal agency responsible for enforcing workplace safety and health regulations in construction.

Question 21: What is the primary role of a safety and health committee on a construction project according to best management practices?

To handle all workers' compensation claims
To conduct all required OSHA training
To replace the need for a full-time safety professional
To serve as a forum for worker-management cooperation in identifying and resolving safety concerns (Correct answer)

Correct answer: To serve as a forum for worker-management cooperation in identifying and resolving safety concerns

Safety committees function as collaborative bodies where workers and management jointly identify hazards, discuss concerns, and develop solutions.

Question 22: What is the purpose of a 'Knox Box' installed at the entrance to a major construction project?

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

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

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

Question 23: What is the primary purpose of a 'try-out' procedure during lockout/tagout?

To check if the equipment needs maintenance beyond the current scope
To ensure all workers have signed the permit
To verify that the energy isolation is effective and the equipment cannot be restarted (Correct answer)
To test whether the locks are strong enough to withstand force

Correct answer: To verify that the energy isolation is effective and the equipment cannot be restarted

The try-out procedure involves attempting to restart the equipment after lockout to verify that all energy sources have been effectively isolated.

Question 24: What does RCRA stand for in the context of hazardous waste management?

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

Correct answer: Resource Conservation and Recovery Act

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

Question 25: Which Heinrich safety triangle ratio concept suggests that for every major injury there are many minor incidents and near-misses below it?

Pareto principle
Heinrich's triangle (1:29:300) (Correct answer)
Domino theory
Swiss cheese model

Correct answer: Heinrich's triangle (1:29:300)

Heinrich's triangle proposes a ratio of 1 major injury for every 29 minor injuries and 300 near-miss events, emphasizing near-miss investigation to prevent serious incidents.

Question 26: Under OSHA 1926.652(c), what is the key requirement for the design of a timber shoring system used as an excavation protective system?

It must be designed by a registered professional engineer or meet the tabulated data in OSHA Appendix C to Subpart P (Correct answer)
Timber shoring is only permitted in Type A soil
Timber shoring must match the design of a manufacturer-certified system
Any experienced carpenter may design and install the system without documentation

Correct answer: It must be designed by a registered professional engineer or meet the tabulated data in OSHA Appendix C to Subpart P

Timber shoring systems must either be designed by a registered professional engineer or comply with the tabulated data provided in OSHA Appendix C to Subpart P, which gives timber sizes and spacing for various excavation depths and soil types.

Question 27: 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
Select the employees who will perform the task
Identify corrective actions for each hazard

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

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

Correct answer: 10 feet

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

Question 29: A company introduces a new type of mobile scaffolding that its workers have never used before. Which of the following actions is required by OSHA regarding employee training?

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

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

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

Question 30: Under OSHA's Hazard Communication Standard, what information must appear on the inner container label of a hazardous chemical?

Only the product identifier
Safety Data Sheet number and emergency contact only
Product identifier and GHS hazard class number only
Product identifier, signal word, hazard pictograms, precautionary statements, and supplier information (Correct answer)

Correct answer: Product identifier, signal word, hazard pictograms, precautionary statements, and supplier information

GHS-aligned labels must include the product identifier, signal word, hazard pictograms, hazard statements, precautionary statements, and supplier identification.

Question 31: A change analysis in incident investigation is best used when:

The incident involved multiple subcontractors
OSHA has already issued a citation
The investigation team cannot agree on who was at fault
A new process, equipment, or condition was recently introduced before the incident (Correct answer)

Correct answer: A new process, equipment, or condition was recently introduced before the incident

Change analysis systematically compares the situation before and after a change was introduced, making it ideal for incidents preceded by a process, equipment, or procedural modification.

Question 32: How far from the edge of an excavation must spoil piles be kept according to OSHA regulations?

At least 4 feet
At least 3 feet
At least 2 feet (Correct answer)
At least 1 foot

Correct answer: At least 2 feet

OSHA requires that spoil piles be kept at least 2 feet from the edge of an excavation to prevent materials from falling back into the trench.

Question 33: Under OSHA's multi-employer worksite policy, which employer bears primary responsibility for correcting hazards they create?

The exposing employer
The creating employer (Correct answer)
The controlling employer
The correcting employer

Correct answer: The creating employer

The creating employer is responsible for eliminating hazards they introduce to the worksite, regardless of who is exposed.

Question 34: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), which energy control procedure requires the use of a lock to secure the energy isolation device?

Blockout
Zero energy state
Tagout
Lockout (Correct answer)

Correct answer: Lockout

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

Question 35: Which type of scaffold relies solely on the building structure for support and has no legs, poles, or uprights?

Supported scaffold
Pump jack scaffold
Mobile scaffold
Suspended scaffold (Correct answer)

Correct answer: Suspended scaffold

Suspended scaffolds hang from an overhead structure using ropes or other non-rigid means rather than being supported from below.

Question 36: When a crane operator cannot see the load at all times, what must be done?

Use a signal person (Correct answer)
Stop the lift immediately
Switch to radio communication only
Reduce the load by 25%

Correct answer: Use a signal person

OSHA requires a qualified signal person whenever the operator does not have a clear view of the load or path of travel.

Question 37: What is a Threshold Limit Value–Ceiling (TLV-C) as defined by ACGIH?

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

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

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

Question 38: What does a 'training needs analysis' (TNA) determine before developing a construction safety program?

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

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

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

Question 39: What is the minimum Assigned Protection Factor (APF) required for a half-face air-purifying respirator?

10 (Correct answer)
50
5
25

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

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

Correct answer: Annually or when the plan changes

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

Question 41: A drum labeled with a UN/DOT hazard class 3 placard contains which category of material?

Corrosive liquids
Toxic gases
Flammable liquids (Correct answer)
Oxidizers

Correct answer: Flammable liquids

DOT Hazard Class 3 designates flammable liquids, including gasoline, acetone, and similar solvents commonly found on construction sites.

Question 42: 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 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 only apply to manufacturing, not construction
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 43: Under OSHA 29 CFR 1926.1427, crane operators must be qualified by which method?

Certification by an accredited crane operator testing organization, employer qualification, or military training (Correct answer)
Holding a valid commercial driver's license
Completing a 40-hour safety course
Five years of documented crane operating experience

Correct answer: Certification by an accredited crane operator testing organization, employer qualification, or military training

OSHA 1926.1427 allows operator qualification through third-party certification (e.g., NCCCO), employer-based qualification program, or equivalent military training.

Question 44: A competent person conducting a daily excavation inspection discovers tension cracks parallel to the trench wall. What is the FIRST action to take?

Remove all workers from the trench immediately (Correct answer)
Increase trench width by benching
Install additional shoring
Document the cracks and continue monitoring

Correct answer: Remove all workers from the trench immediately

Tension cracks parallel to a trench wall are a sign of imminent cave-in, requiring immediate worker evacuation.

Question 45: Under OSHA's scaffolding standard (29 CFR 1926.451), what is the maximum height a scaffold's working level can be constructed without full fall protection?

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

Correct answer: 10 feet

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

Question 46: Which scaffolding safety requirement under OSHA 29 CFR 1926.451 specifies the minimum load-bearing capacity that supported scaffolds must be capable of supporting?

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

Correct answer: 4 times the intended load

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

Question 47: Under the GHS-format SDS, which section contains exposure controls and personal protective equipment requirements?

Section 2 — Hazard Identification
Section 8 — Exposure Controls/Personal Protection (Correct answer)
Section 4 — First-Aid Measures
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 48: What action must be taken before working on or near a crane's electrical systems?

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

Correct answer: Apply lockout/tagout procedures

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

Question 49: What does 'safety culture' refer to in construction safety program management?

The number of safety posters displayed on the job site
Whether workers have completed OSHA 10 or OSHA 30 training
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)
The organization's OSHA compliance record and number of citations

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 50: After a worker's personal fall arrest system has arrested a fall, what is the required action regarding the equipment?

Inspect and return to service if no visible damage is found
Clean thoroughly, re-inspect, and allow the worker to decide on continued use
Remove from service and retire or send to manufacturer for inspection before reuse (Correct answer)
Tag the equipment and allow use for one additional shift only

Correct answer: Remove from service and retire or send to manufacturer for inspection before reuse

OSHA requires that all components of a PFAS that have been subjected to fall arrest forces be immediately removed from service and not reused unless inspected and deemed serviceable by the manufacturer.

Question 51: What does the hierarchy of controls prescribe as the MOST effective method to reduce workplace hazards?

Personal protective equipment
Administrative controls
Elimination (Correct answer)
Engineering 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 52: 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?

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

Correct answer: 1 hour

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

Question 53: 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?

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

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

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

Question 54: A roofer experiences tingling and numbness in fingers after long-term use of vibrating equipment. This condition is BEST described as:

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

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 55: A competent person inspects an excavation after a rainstorm. What is the MOST important action if the walls show signs of tension cracking?

Add timber shoring immediately
Continue work with additional PPE
Increase dewatering pump speed
Remove all workers and reassess protective systems (Correct answer)

Correct answer: Remove all workers and reassess protective systems

Tension cracks are a warning sign of imminent collapse; all workers must be removed until a competent person determines the excavation is safe.

Question 56: A construction worker experiences sudden loss of sensation in fingers after extended use of a jackhammer. This condition is MOST likely:

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

Correct answer: Hand-arm vibration syndrome (HAVS)

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

Question 57: When conducting a Job Hazard Analysis (JHA), which step comes FIRST in the process?

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

Correct answer: Select the job to be analyzed

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

Question 58: A framing crew has several new members who do not speak English. According to OSHA requirements, how must the employer handle mandatory safety training for these workers?

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

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

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

Question 59: 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.
Using compressed air to remove lead dust from surfaces. (Correct answer)
Wet-sanding the painted surfaces.
Placing contaminated clothing in sealed containers.

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 60: Which NFPA 704 diamond section color indicates health hazard information?

Yellow (right)
White (bottom)
Blue (left) (Correct answer)
Red (top)

Correct answer: Blue (left)

The NFPA 704 diamond uses blue on the left quadrant to indicate health hazards, rated 0–4.

Question 61: Which training method is MOST effective for teaching construction workers proper scaffold erection procedures?

Hands-on demonstration with supervised practice (Correct answer)
Sending an email with attached diagrams
Distributing written handouts only
Posting safety bulletins on the jobsite board

Correct answer: Hands-on demonstration with supervised practice

Hands-on demonstration with supervised practice allows workers to physically perform the task under guidance, which is the most effective method for skill-based safety training.

Question 62: Which OSHA standard requires employers to develop and implement a written Respiratory Protection Program for construction workers using respirators?

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

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 63: Which class of fire involves energized electrical equipment, and why must water never be used to extinguish it?

Class A — ordinary combustibles; water is ineffective on electrical fires
Class D — combustible metals; water causes violent chemical reactions
Class B — flammable liquids; water spreads the fire
Class C — energized electrical equipment; water is conductive and creates an electrocution path from the energized equipment to the person using the extinguisher (Correct answer)

Correct answer: Class C — energized electrical equipment; water is conductive and creates an electrocution path from the energized equipment to the person using the extinguisher

Class C fires involve energized electrical equipment. Water is an electrical conductor, so spraying water on energized electrical fires creates an electrocution path from the energized equipment through the water stream to the operator.

Question 64: At what depth must a registered professional engineer design a protective system for a trench according to OSHA standards?

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

Correct answer: 20 feet

OSHA requires a protective system designed by a registered professional engineer for trenches 20 feet or deeper.

Question 65: How should a tag line be used during a crane lift?

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

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

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

Question 66: A safety professional calculates the incident rate for a company with 3 recordable injuries, 100 employees working 40 hrs/week for 50 weeks. What is the TRIR?

0.6
3.0 (Correct answer)
6.0
1.5

Correct answer: 3.0

TRIR = (Number of recordable injuries × 200,000) ÷ total hours worked; (3 × 200,000) ÷ (100 × 40 × 50) = 600,000 ÷ 200,000 = 3.0.

Question 67: Under 29 CFR 1926.502, what is the maximum force a personal fall arrest system must be able to withstand during a fall arrest event?

1,800 pounds applied over 6 feet
5,000 pounds (Correct answer)
900 pounds
1,800 pounds

Correct answer: 5,000 pounds

OSHA requires anchorage points for personal fall arrest systems to support at least 5,000 pounds per attached worker.

Question 68: Which OSHA standard specifically governs confined spaces in construction?

29 CFR 1926 Subpart AA (1926.1200-1213) (Correct answer)
29 CFR 1910.146
29 CFR 1926.650
29 CFR 1926.502

Correct answer: 29 CFR 1926 Subpart AA (1926.1200-1213)

OSHA's 29 CFR 1926 Subpart AA (1926.1200-1213) specifically addresses confined spaces in construction, establishing requirements for permit spaces, entry procedures, training, and rescue.

Question 69: 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
5 feet
10 feet (Correct answer)
20 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 70: Which instrument is used to measure a worker's personal noise dose over the course of a full work shift?

Sound level meter (SLM)
Noise dosimeter (Correct answer)
Vibration meter
Octave band analyzer

Correct answer: Noise dosimeter

A noise dosimeter is worn by the worker and integrates variable noise exposures over the entire shift to calculate a percent dose or TWA. A sound level meter gives instantaneous readings at a fixed point. An octave band analyzer characterizes frequency content for engineering control design. A vibration meter measures vibration, not sound.

Question 71: When using a two-point suspension scaffold (swing stage), what is the required safety factor for the supporting ropes?

4 to 1
2 to 1
6 to 1 (Correct answer)
10 to 1

Correct answer: 6 to 1

OSHA requires a minimum safety factor of 6:1 for suspension ropes on two-point adjustable suspension scaffolds.

Question 72: What OSHA standard requires a written Chemical Hygiene Plan in laboratories that use hazardous chemicals?

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

Correct answer: 29 CFR 1910.1450

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

Question 73: What action is required when an employee whose lock is on a piece of equipment cannot be located at shift end?

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

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

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

Question 74: A CHST notices workers using spray-applied coatings containing silica in an enclosed space without respiratory protection. The MOST appropriate corrective action is to:

Provide half-face respirators with N95 filters to all workers and allow work to resume
Post warning signs and allow work to continue until end of shift
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)

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

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

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 76: Which hazard control method is considered most effective in the hierarchy of controls?

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

Correct answer: Elimination

Elimination—physically removing the hazard—is the most effective control measure because it completely removes the source of the hazard from the workplace.

Question 77: Which of the following is a key element that MUST be included in a company's written Fire Prevention Plan (FPP) according to the standard referenced by OSHA for construction (29 CFR 1910.39)?

Procedures to account for all employees after an evacuation.
Emergency escape procedures and route assignments.
Rescue and medical duties for assigned employees.
A list of major fire hazards and procedures for their control. (Correct answer)

Correct answer: A list of major fire hazards and procedures for their control.

A Fire Prevention Plan's purpose is to prevent fires from starting. According to 29 CFR 1910.39(c), the plan must include 'A list of all major fire hazards, proper handling and storage procedures for hazardous materials, [and] potential ignition sources and their control'. The other options are required elements of an Emergency Action Plan (EAP), not a Fire Prevention Plan.

Question 78: A construction site has a permit-required confined space. Which element is NOT required before entry?

Testing atmospheric conditions for oxygen and hazardous gases
Ensuring a trained attendant is stationed outside
Completing a written post-entry debrief within 24 hours (Correct answer)
Issuing an entry permit signed by an authorized entrant

Correct answer: Completing a written post-entry debrief within 24 hours

OSHA's confined space standard (29 CFR 1926.1203) requires atmospheric testing, a valid entry permit, and an attendant, but does not mandate a written post-entry debrief within 24 hours.

Question 79: When must a pre-lift meeting be conducted on a critical lift?

Before the lift begins, with all personnel involved in the operation (Correct answer)
Only when a new operator is performing the lift
Only when the load exceeds 100 tons
After the load is rigged but before it leaves the ground

Correct answer: Before the lift begins, with all personnel involved in the operation

Pre-lift meetings must occur before the lift to ensure all personnel understand the plan, signals, hazards, and responsibilities.

Question 80: Which hierarchy of controls level is considered most effective for eliminating workplace hazards?

Elimination (Correct answer)
Engineering controls
Administrative controls
PPE

Correct answer: Elimination

Elimination — physically removing the hazard — is the most effective control because it removes the source of risk entirely rather than managing exposure.

Question 81: Under OSHA 1910.147, what is required before an authorized employee may restore energy to equipment after LOTO servicing is complete?

The supervisor removes the lockout device on behalf of the crew
The safety officer certifies the repair is complete in writing
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)
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 82: What condition requires a scaffold to be immediately removed from service, regardless of other factors?

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

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

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

Question 83: A CHST discovers that a subcontractor is falsifying injury logs on a project where the CHST works for the general contractor. The CHST's primary ethical obligation is to:

Advise the subcontractor's safety officer informally and give them time to self-correct
Stay out of the matter since the CHST is employed by the GC, not the subcontractor
Report the falsification to OSHA immediately without informing the GC
Notify GC management and document the concern; escalate to OSHA if the GC fails to act (Correct answer)

Correct answer: Notify GC management and document the concern; escalate to OSHA if the GC fails to act

Falsifying OSHA 300 logs is a federal violation (29 CFR 1904). The CHST's ethical duty is to report the concern to GC management with documentation, since the GC has supervisory responsibility over subcontractors on-site. If management fails to act, escalation to OSHA fulfills the duty to uphold regulatory compliance. Going directly to OSHA before internal escalation skips the CHST's professional duty to act through appropriate channels first.

Question 84: The 'Catch and Fix' or 'STOP' observation programs used in construction are examples of:

Behavior-based safety (BBS) programs that observe and reinforce safe work practices (Correct answer)
Environmental monitoring programs for air quality on job sites
Incident investigation protocols following a recordable injury
OSHA enforcement programs conducted by compliance officers

Correct answer: Behavior-based safety (BBS) programs that observe and reinforce safe work practices

BBS programs like STOP use structured peer observations to identify at-risk behaviors and reinforce safe ones before incidents occur.

Question 85: 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
5-Why method
Fault tree analysis (Correct answer)
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 86: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), who is generally the only person authorized to remove a lock or tag from an energy isolating device?

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

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

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

Question 87: When a non-permit confined space must be reclassified as permit-required, which condition most commonly triggers this change?

Work activities inside the space create additional hazards such as welding fumes or oxygen displacement (Correct answer)
The space has not been inspected for more than 6 months
More than two workers are required to enter simultaneously
The space is accessed after normal working hours

Correct answer: Work activities inside the space create additional hazards such as welding fumes or oxygen displacement

When work performed inside a non-permit confined space introduces new hazards—such as welding that generates toxic fumes or displaces oxygen—the space must be reclassified as permit-required.

Question 88: Which approach BEST ensures that lessons learned from a serious incident are communicated effectively across all crews on a large construction site?

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

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

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

Question 89: What is the maximum permissible noise exposure level for an 8-hour time-weighted average under OSHA construction standards?

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

Correct answer: 90 dBA

OSHA's construction noise standard (29 CFR 1926.52) sets the permissible exposure limit at 90 dBA for an 8-hour TWA.

Question 90: According to 29 CFR 1926 Subpart P, what is the maximum lateral distance a worker may travel within a trench to reach a means of egress?

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

Correct answer: 25 feet

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

Question 91: Which visual communication method is MOST effective for warning construction workers about overhead crane operations in a specific zone?

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

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

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

Question 92: Which of the following BEST describes a 'contributing cause' in incident investigation terminology?

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

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

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

Question 93: 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.
Benching appropriate for Type B soil.
Approval by the site's competent person.
Design by a registered professional engineer. (Correct answer)

Correct answer: Design by a registered professional engineer.

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

Question 94: Under OSHA 1926.152, quantities of flammable liquids greater than 25 gallons must be stored in what type of container or facility?

Approved, closed containers in approved flammable storage cabinets or in a detached building dedicated to flammable storage (Correct answer)
Standard metal tool chests with hazard labeling
Open containers with warning labels in ventilated areas
Any covered container away from heat sources

Correct answer: Approved, closed containers in approved flammable storage cabinets or in a detached building dedicated to flammable storage

OSHA 1926.152(b)(1) requires flammable liquids in excess of 25 gallons to be stored in an approved storage cabinet or in a room or detached building designed for flammable storage.

Question 95: During a multi-crane lift, what is the most crucial element of communication between the crane operators and the lift director?

Relying on the lead operator to relay all commands to the other operator.
Using hand signals exclusively for all communication.
Ensuring all operators are on the same, dedicated radio channel. (Correct answer)
Having each operator communicate only with their designated spotter.

Correct answer: Ensuring all operators are on the same, dedicated radio channel.

For multi-crane lifts, effective and clear communication is paramount. OSHA requires a dedicated means of communication, such as a radio channel, for the lift director to coordinate with all operators simultaneously to ensure a safe and synchronized lift.

Question 96: 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 97: According to NFPA 10, how far must a portable fire extinguisher be located from a Class B hazard in a construction setting?

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

Correct answer: 50 feet

NFPA 10 requires Class B fire extinguishers to be placed no more than 50 feet from the hazard.

Question 98: What is the purpose of 'isolation' as a hazard control step in confined space entry?

To establish visual barriers around the confined space for emergency access
To physically disconnect energy sources and block introduction of hazardous materials into the space (Correct answer)
To separate the confined space from adjacent work areas using barricade tape
To prevent unauthorized workers from approaching the permit space perimeter

Correct answer: To physically disconnect energy sources and block introduction of hazardous materials into the space

Isolation involves locking out/tagging out energy sources, blanking or blinding pipe connections, and otherwise physically preventing hazardous energy or substances from entering or affecting the space.

Question 99: When conducting a confined space entry on a construction site, which atmospheric condition requires immediate evacuation?

Oxygen level at 20.9%
Humidity above 80%
Temperature above 90 degrees Fahrenheit
Oxygen level below 19.5% or above 23.5% (Correct answer)

Correct answer: Oxygen level below 19.5% or above 23.5%

An oxygen-deficient atmosphere below 19.5% or oxygen-enriched atmosphere above 23.5% both represent immediately dangerous conditions requiring evacuation.

Question 100: During a concrete pour, a form suddenly bulges outward at the base. The FIRST corrective action should be:

Continue the pour and add wedges to the outside of the form
Reduce the concrete pump pressure and continue at a slower rate
Stop the pour immediately and evacuate workers from the affected area (Correct answer)
Notify the engineer and await instructions before stopping the pour

Correct answer: Stop the pour immediately and evacuate workers from the affected area

Form bulging indicates imminent failure from excess lateral pressure. The immediate priority is life safety — stop the pour and evacuate all personnel from the hazard zone. Continuing the pour at any rate risks progressive collapse. Engineering consultation follows evacuation, not precedes it.

Question 101: What is a 'trench shield' (trench box), and what is its primary limitation compared to hydraulic shoring?

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

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

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

Question 102: Who is in charge of making sure that every hand and power instrument used on a construction site is properly maintained and functional?

OSHA
The employee
The employer (Correct answer)
Contracted labor unions

Correct answer: The employer

Despite the fact that everyone on the job site should take responsibility for safety, it is ultimately the employer's duty to make sure that only functional hand and power instruments are used.

Question 103: A safety technician is reviewing incident records and calculates a Days Away, Restricted, or Transferred (DART) rate of 4.5. How is this rate expressed?

Per 100 workers per year
Per 50 employees
Per 1,000,000 hours worked
Per 200,000 hours worked (Correct answer)

Correct answer: Per 200,000 hours worked

OSHA injury/illness rates including DART are calculated per 200,000 hours worked, which represents 100 full-time equivalent employees working one year.

Question 104: Which of the following best describes the 'action level' for noise under OSHA's Hearing Conservation Amendment (29 CFR 1910.95)?

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

Correct answer: 85 dBA as an 8-hour TWA

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

Question 105: When erecting, moving, dismantling, or altering scaffolding, who must direct these activities?

The project superintendent
A competent person (Correct answer)
An OSHA-certified scaffold erector
Any qualified worker on site

Correct answer: A competent person

OSHA requires that a competent person direct all scaffold erection, moving, dismantling, and alteration work.

Question 106: Which utility locating service must be contacted before excavation begins in the United States?

OSHA area office
811 (Call Before You Dig) (Correct answer)
State labor department
Local fire authority

Correct answer: 811 (Call Before You Dig)

Federal law requires contractors to contact 811 (the national call-before-you-dig number) to have underground utilities marked before any excavation.

Question 107: A worker is cleaning beneath a suspended load while the crane operator takes a break. Which OSHA principle does this violate?

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

Correct answer: All of the above

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

Question 108: According to OSHA HazCom 2012, signal words used on labels are limited to:

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

Correct answer: Warning and Danger

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

Question 109: A barrier analysis used in incident investigation focuses on:

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

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 110: What is the primary purpose of a crane's load chart?

To log maintenance schedules
To record operator certifications
To specify lubrication intervals
To define maximum lifting capacities at various radii and boom angles (Correct answer)

Correct answer: To define maximum lifting capacities at various radii and boom angles

Load charts provide the rated capacity of a crane at specific boom lengths, radii, and configurations to prevent overloading.

Question 111: A project safety manager is developing a subcontractor prequalification process. Which criterion is MOST relevant to safety program effectiveness?

Number of employees on the subcontractor's payroll
Subcontractor's three-year TRIR and DART rates compared to industry averages (Correct answer)
The subcontractor's proximity to the project site
Whether the subcontractor uses union or non-union labor

Correct answer: Subcontractor's three-year TRIR and DART rates compared to industry averages

TRIR and DART rates provide objective, industry-benchmarked evidence of a subcontractor's historical safety performance.

Question 112: A construction worker notices smoke coming from electrical conduit inside a wall cavity. Which type of fire extinguisher is appropriate?

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

Correct answer: Class C-rated extinguisher

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

Question 113: Under OSHA 1926.150, which type of fire extinguisher is appropriate for a Class B (flammable liquid) fire on a construction site?

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

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 114: What is the primary purpose of a Safety and Health Management System (SHMS) on a construction project?

To systematically identify, evaluate, and control hazards proactively (Correct answer)
To document incidents for insurance purposes
To satisfy OSHA recordkeeping requirements
To set daily production targets for crews

Correct answer: To systematically identify, evaluate, and control hazards proactively

An SHMS provides a structured, proactive framework for identifying and controlling hazards before incidents occur, rather than reacting after the fact.

Question 115: In an excavation where oxygen deficiency or hazardous atmospheres could exist, what must be provided to workers before entry?

Atmospheric testing and appropriate respiratory protection (Correct answer)
Hard hats and high-visibility vests only
A written evacuation plan posted at the site entrance
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 116: During a confined space entry, the attendant's PRIMARY duty is to:

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

Correct answer: Monitor entrants and maintain continuous communication

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

Question 117: A construction company wants to benchmark its safety performance against industry peers. Which data source provides the most standardized comparison?

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

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

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

Question 118: What does a crane's 'load chart' specify, and why must it be accessible to the operator at all times?

The OSHA certification status of the crane
The maximum loads the crane can safely lift at various radii, boom lengths, and configurations — it must be accessible so the operator can verify any proposed lift is within rated capacity (Correct answer)
The crane's maintenance schedule and lubrication intervals
The crane's travel speed under different load conditions

Correct answer: The maximum loads the crane can safely lift at various radii, boom lengths, and configurations — it must be accessible so the operator can verify any proposed lift is within rated capacity

A crane load chart provides the rated capacity for the crane at varying radii, boom lengths, boom angles, and configurations, allowing the operator to determine whether a proposed lift is within the crane's safe working load.

Question 119: A portable fire extinguisher rated '2-A:10-B:C' is appropriate for use on which types of fires?

Class A and Class C fires only
Class A and Class B fires only
Class B and Class C fires only
Class A, Class B, and Class C fires (Correct answer)

Correct answer: Class A, Class B, and Class C fires

The 'A:B:C' rating indicates the extinguisher is suitable for ordinary combustibles (A), flammable liquids (B), and electrical fires (C).

Question 120: When using a positioning device system, the maximum free-fall must be limited to how many feet?

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

Correct answer: 2 feet

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

Question 121: A controlled access zone (CAZ) used in lieu of guardrails must be defined by a control line set back at least how far from the unprotected edge?

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

Correct answer: 6 feet

OSHA requires control lines for CAZs to be erected no less than 6 feet from the unprotected edge.

Question 122: An electrical arc flash incident on a construction site results in second-degree burns to a worker wearing standard work clothes. Which NFPA 70E concept was most likely neglected?

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

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

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

Question 123: When creating training materials for low-literacy construction workers, which instructional design strategy is MOST effective?

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

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

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

Question 124: Under OSHA 29 CFR 1926 Subpart CC, what is the minimum ground-to-power-line clearance distance required for a crane when the line voltage is between 50 kV and 200 kV?

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

Correct answer: 15 feet

OSHA 1926.1408 Table A requires a 15-foot minimum clearance for voltages over 50 kV up to 200 kV during crane operations.

Question 125: Under OSHA's LOTO standard (29 CFR 1910.147), what must an employer do before employees perform LOTO procedures for the first time?

Install permanent warning signs on all equipment
Notify OSHA in writing
Post lockout procedures on a public bulletin board
Train employees and certify the training (Correct answer)

Correct answer: Train employees and certify the training

OSHA requires employers to train each authorized and affected employee and certify that training has been accomplished.

Question 126: A scaffold plank must extend beyond its support at least how many inches but no more than 18 inches?

12 inches
3 inches
9 inches
6 inches (Correct answer)

Correct answer: 6 inches

OSHA 1926.451 requires scaffold planks to overhang supports by at least 6 inches and no more than 18 inches.

Question 127: During a mass casualty incident on a construction site, the START triage system classifies a victim who is breathing but has a respiratory rate above 30 breaths per minute as which color tag?

Yellow
Green
Red (Correct answer)
Black

Correct answer: Red

The START triage system tags patients red (immediate) if respirations exceed 30 per minute, indicating critical need for intervention.

Question 128: Which condition would allow a permit-required confined space to be reclassified as a non-permit confined space for entry?

A safety officer monitors the space continuously
All workers complete confined space training
All hazards within the space are eliminated or isolated before entry (Correct answer)
The space is ventilated for at least 30 minutes prior to entry

Correct answer: All hazards within the space are eliminated or isolated before entry

A permit space may be reclassified as non-permit only when all actual hazards have been eliminated or isolated and the space is verified safe by testing.

Question 129: A construction safety manager wants to promote a positive safety culture. Which leadership behavior is MOST impactful?

Posting safety statistics on the bulletin board and waiting for improvement
Visibly participating in site safety walkthroughs and addressing hazards found during them without blame (Correct answer)
Rewarding crews only for zero-injury months to incentivize reporting suppression
Delegating all safety responsibilities entirely to the safety department

Correct answer: Visibly participating in site safety walkthroughs and addressing hazards found during them without blame

Visible leadership commitment and non-punitive hazard correction are among the strongest predictors of positive safety culture.

Question 130: What type of fire suppression system is most commonly required in partially enclosed construction areas where sprinklers are temporarily out of service?

Halotron system
Standpipe system
Dry chemical fixed system
Temporary fire watch with extinguishers (Correct answer)

Correct answer: Temporary fire watch with extinguishers

When sprinkler systems are impaired during construction, a temporary fire watch must be established until the system is restored.

Question 131: A contractor must manage a scope change that introduces new chemical exposures on-site. What is the FIRST action the safety technician should take?

Obtain and review SDSs for the new chemicals (Correct answer)
Order appropriate PPE for the anticipated chemicals
Update the site's emergency response plan
Notify OSHA of the change in scope via their online portal

Correct answer: Obtain and review SDSs for the new chemicals

Reviewing SDSs first provides the hazard information needed to determine appropriate controls, PPE, and emergency measures.

Question 132: Which soil test involves rolling a moist soil sample into a thread and observing if it crumbles?

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

Correct answer: Thread test

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

Question 133: What is the maximum overhang allowed for a scaffold plank beyond its end support?

24 inches
18 inches (Correct answer)
12 inches
6 inches

Correct answer: 18 inches

Scaffold planks must not overhang their end supports by more than 18 inches to prevent excessive cantilever deflection.

Question 134: A safety manager notices workers consistently bypass a machine guard. According to behavior-based safety (BBS) principles, the BEST response is to:

Observe the task, identify the antecedents driving the behavior, and redesign the consequence system to reinforce safe behavior (Correct answer)
Remove the guard and trust workers to self-regulate
Immediately terminate workers who bypass guards as a deterrent
Issue written warnings to all workers observed bypassing the guard

Correct answer: Observe the task, identify the antecedents driving the behavior, and redesign the consequence system to reinforce safe behavior

BBS focuses on antecedents and consequences (ABC model) to understand and change behaviors rather than purely punitive responses.

Question 135: What PPE is required when working on energized electrical systems with exposed live parts above 50 volts?

Rubber insulating gloves rated for the voltage level, worn with leather protectors (Correct answer)
Insulated boots only
Standard leather work gloves and safety glasses
Dielectric hard hat and safety glasses only

Correct answer: Rubber insulating gloves rated for the voltage level, worn with leather protectors

NFPA 70E and OSHA require rubber insulating gloves rated for the voltage level being worked on, worn with leather protectors to prevent mechanical damage, when working on energized electrical parts.

Question 136: Which class of fire extinguisher is specifically designed to fight fires involving energized electrical equipment on a construction site?

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

Correct answer: Class C

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

Question 137: Under what circumstance may workers enter an unprotected excavation less than 5 feet deep?

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

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

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

Question 138: What does a crane's 'derating' mean in the context of crane operations?

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

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

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

Question 139: Which OSHA construction standard governs electrical safety requirements specifically for the construction industry, as distinct from general industry?

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

Correct answer: 29 CFR 1926.400–449

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

Question 140: What is the primary purpose of a critical lift plan on a construction site?

To document all lifts exceeding 75% of the crane's rated capacity or involving unusual hazards (Correct answer)
To replace the need for a certified crane operator during complex lifts
To satisfy insurance requirements for general contractor liability
To eliminate the requirement for a signal person during hoisting operations

Correct answer: To document all lifts exceeding 75% of the crane's rated capacity or involving unusual hazards

A critical lift plan addresses lifts that approach the crane's capacity limits or involve special hazards, requiring detailed pre-lift engineering and safety analysis.

Question 141: Under OSHA's Excavation Standard (29 CFR 1926 Subpart P), what is the minimum depth that requires a protective system unless the excavation is in stable rock?

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

Correct answer: 5 feet

OSHA requires a protective system (sloping, shoring, or shielding) for excavations 5 feet or deeper unless the excavation is entirely in stable rock.

Question 142: A construction supervisor observes a worker using an extension cord with a damaged outer jacket. The BEST immediate corrective action is to:

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

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

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

Question 143: Which OSHA standard specifically addresses the Hazard Communication requirements for chemical health hazards on construction sites?

29 CFR 1926.59 (Correct answer)
29 CFR 1926.65
29 CFR 1926.62
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 144: According to NFPA 70E, what is the primary purpose of an Energized Electrical Work Permit?

To authorize unqualified workers to perform electrical tasks under supervision
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 satisfy OSHA recordkeeping requirements for electrical incidents

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 145: Which OSHA standard specifically governs training requirements for employees exposed to fall hazards in construction?

29 CFR 1926.503 (Correct answer)
29 CFR 1926.21
29 CFR 1926.1060
29 CFR 1926.500

Correct answer: 29 CFR 1926.503

29 CFR 1926.503 establishes fall protection training requirements, including retraining when deficiencies are observed.

Question 146: Under OSHA 1926.502(d), when a worker is using a body harness in a personal fall arrest system, the total fall distance (including deceleration) must not exceed:

6 feet
12 feet (Correct answer)
10.5 feet
18.5 feet

Correct answer: 12 feet

The total fall distance including deceleration distance cannot exceed 12 feet under OSHA 1926.502(d).

Question 147: What is the minimum illumination level OSHA requires for general construction areas, warehouses, and corridors?

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

Correct answer: 5 foot-candles

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

Question 148: The IDLH (Immediately Dangerous to Life or Health) value for a chemical represents:

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

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

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

Question 149: What hazard does 'shock loading' present during rigging operations?

It can impose forces on the crane and rigging components several times greater than the static load weight (Correct answer)
It only affects synthetic slings and has no impact on wire rope
It drains the hydraulic fluid reservoir of the crane
It causes the outrigger floats to sink into soft ground

Correct answer: It can impose forces on the crane and rigging components several times greater than the static load weight

Shock loading from sudden starts, stops, or slack-to-taut snapping can multiply the dynamic forces on rigging and crane components well beyond their rated static capacities.

Question 150: Under OSHA's Respiratory Protection Standard (29 CFR 1910.134), which type of respirator provides the highest level of protection?

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

Correct answer: Self-Contained Breathing Apparatus (SCBA)

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

Question 151: 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 3 feet from the edge
At least 5 feet from the edge
At least 2 feet from the edge (Correct answer)

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 152: A CHST is pressured by a project manager to sign off on a scaffold inspection knowing the scaffold does not meet OSHA standards. According to BCSP's Code of Ethics, the CHST should:

Refuse to certify the scaffold and report the deficiency through appropriate channels (Correct answer)
Request that another safety professional inspect and potentially certify it
Sign off to maintain the professional relationship, then document concerns privately
Advise workers verbally of the hazard but sign the form to avoid conflict

Correct answer: Refuse to certify the scaffold and report the deficiency through appropriate channels

BCSP's Code of Ethics requires certificants to hold worker safety paramount above employer directives. Signing an inaccurate safety certification is both an ethical violation and potential legal liability. The CHST must refuse, document the deficiency, and escalate through appropriate channels (management, OSHA if necessary).

Question 153: Which knot type is prohibited for use in tying off a lanyard to an anchorage point?

Figure-eight knot
Standard knot-in-the-end (overhand knot) (Correct answer)
All knots are prohibited; only hardware connectors are allowed
Bowline knot

Correct answer: Standard knot-in-the-end (overhand knot)

Tying knots in lanyards can reduce their strength by up to 50%, and simple overhand knots are specifically discouraged as they cause the greatest strength reduction.

Question 154: Under OSHA's Hazard Communication Standard (HazCom 2012), when must workers be trained on newly identified chemical hazards?

Within 30 days of the new chemical's introduction
At the next scheduled annual training session
Before they work with the new hazardous chemical (Correct answer)
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 155: A construction worker develops redness, itching, and blistering after contact with uncured epoxy resin. This reaction is BEST classified as:

Irritant contact dermatitis
Photodermatitis
Allergic contact dermatitis (Correct answer)
Chemical burn

Correct answer: Allergic contact dermatitis

Epoxy resin reactions that involve immune sensitization and occur after repeated exposures are classified as allergic contact dermatitis.

Question 156: Under OSHA 1926.24, what must a construction site fire prevention plan include?

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

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

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

Question 157: What is the primary purpose of a fire watch on a construction site after hot work operations have been completed?

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

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 158: During a pre-task planning meeting, a crew identifies a hazard but no standard operating procedure exists to address it. What is the MOST appropriate immediate action?

Report the hazard to OSHA for guidance
Proceed with the task using extra caution
Wait until the next scheduled safety meeting to discuss the issue
Stop work and develop a site-specific safety plan for the hazard before proceeding (Correct answer)

Correct answer: Stop work and develop a site-specific safety plan for the hazard before proceeding

Developing a site-specific safety plan before work begins ensures the newly identified hazard is properly assessed and controlled rather than relying on informal caution.

Question 159: Which GHS pictogram indicates an acute toxicity hazard?

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

Correct answer: Skull and crossbones

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

Question 160: 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?

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

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

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

Correct answer: 16 sections

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

Question 162: Under OSHA definitions, 'engulfment' in a confined space refers to:

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

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

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

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

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

Correct answer: Missing or illegible load tag

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

Question 164: Which OSHA standard establishes requirements for controlling hazardous energy during servicing and maintenance of machinery?

29 CFR 1910.147 (Correct answer)
29 CFR 1910.333
29 CFR 1926.500
29 CFR 1926.417

Correct answer: 29 CFR 1910.147

29 CFR 1910.147 is the OSHA lockout/tagout standard that controls hazardous energy during servicing and maintenance activities.

Question 165: What does the term 'competent person' mean under OSHA construction standards?

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

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 166: Which class of fire involves energized electrical equipment?

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

Correct answer: Class C

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

Question 167: Under OSHA 29 CFR 1926.403, what is the maximum allowable voltage for flexible cords used with portable tools on construction sites without additional overcurrent protection?

120 volts
240 volts
The standard does not set a voltage limit for flexible cords (Correct answer)
600 volts with proper insulation rating

Correct answer: The standard does not set a voltage limit for flexible cords

OSHA 1926.403 addresses conductor use and protection requirements but does not set a specific voltage ceiling for flexible cords; insulation and rating requirements apply based on application.

Question 168: What is the purpose of a Hot Work Permit system, and how long must a fire watch remain after hot work is completed?

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

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

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

Question 169: Which of the following is NOT an OSHA-required form under 29 CFR 1904 for recording work-related injuries and illnesses?

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

Correct answer: OSHA Form 302 — Worker Medical History

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

Question 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
90 dBA (Correct answer)
100 dBA
140 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: Under OSHA 1926.416, what minimum clearance must be maintained from overhead energized power lines rated at 50 kV or below when using equipment on a construction site?

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

Correct answer: 10 feet

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

Question 172: Which OSHA standard governs the handling and disposal of lead on construction sites?

29 CFR 1926.62 (Correct answer)
29 CFR 1926.1101
29 CFR 1910.1200
29 CFR 1910.1025

Correct answer: 29 CFR 1926.62

OSHA 29 CFR 1926.62 is the construction-specific lead standard governing exposure, PPE, and medical surveillance.

Question 173: A CHST investigating a near-miss incident involving a scissor lift tip-over should use which root cause analysis method to identify systemic factors?

5 Whys technique (Correct answer)
Safety walk-around checklist
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 174: To demonstrate compliance with OSHA's training requirements, which of the following is the most critical element for an employer to document?

The employee's name, date of training, and the topics covered. (Correct answer)
The employee's score on a non-mandatory quiz.
The catering menu for the lunch provided during the training.
The cost per employee for the training session.

Correct answer: The employee's name, date of training, and the topics covered.

While not all OSHA standards have identical recordkeeping rules, best practice and specific standards (e.g., Confined Spaces, 1926.1207(d)) require employers to maintain a record of safety training. This record should, at a minimum, include the employee's name, the date(s) of training, and the subject matter to certify that the training occurred.

Question 175: 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?

5 feet
20 feet
15 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 176: When performing a root cause analysis after an incident, which tool is BEST suited for systematically identifying contributing causes by asking 'why' repeatedly?

Scatter diagram
Pareto chart
Fault tree analysis
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 177: A worker trips over a poorly routed extension cord but catches themselves, resulting in no injury or damage. According to safety management principles, what is the primary purpose of investigating this near-miss incident?

To identify and correct the root causes to prevent a more serious incident in the future. (Correct answer)
To add the incident to the OSHA 300 log for regulatory compliance.
To discipline the worker responsible for creating the trip hazard.
To document the event for the company's insurance carrier.

Correct answer: To identify and correct the root causes to prevent a more serious incident in the future.

The primary goal of a near-miss investigation is to be proactive. By identifying the root causes of an event that could have caused injury—such as poor housekeeping or lack of cable management—a company can implement corrective actions to prevent a future, potentially severe, accident from occurring.

Question 178: Under OSHA 29 CFR 1926.65 (HAZWOPER), workers performing hazardous waste site clean-up operations must receive how many hours of initial training before working on-site unsupervised?

16 hours
8 hours
24 hours
40 hours (Correct answer)

Correct answer: 40 hours

OSHA's HAZWOPER standard at 29 CFR 1926.65(e)(3) requires a minimum of 40 hours of off-site training plus 3 days of supervised field experience for general site workers.

Question 179: What is the minimum distance a spoil pile must be kept from the edge of an excavation under OSHA 1926.651?

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

Correct answer: 2 feet

OSHA requires spoil piles to be placed at least 2 feet from the edge of an excavation to prevent cave-ins.

Question 180: A safety manager discovers that a specific crew consistently skips the pre-task planning process. What is the MOST effective corrective action?

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

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

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

Question 181: When conducting a Job Hazard Analysis (JHA) for a task involving hydrogen sulfide (H₂S) in a confined space, which TWO characteristics of H₂S are MOST critical to note?

It is heavier than air and has a very low IDLH (50 ppm) (Correct answer)
It is lighter than air and has a high IDLH (500 ppm)
It causes corrosion of metals but has no acute toxicity
It is detectable by smell at all dangerous concentrations

Correct answer: It is heavier than air and has a very low IDLH (50 ppm)

H₂S is denser than air (accumulates in low areas of confined spaces) and has a very low IDLH of 50 ppm, making it immediately dangerous even at relatively low concentrations.

Question 182: When photographing an incident scene, the RECOMMENDED sequence is to photograph:

Only damaged equipment and injured personnel
Whatever the OSHA compliance officer requests first
The overall scene first, then mid-range, then close-up details (Correct answer)
Close-up details first, then mid-range, then the overall scene

Correct answer: The overall scene first, then mid-range, then close-up details

Standard forensic photography protocol captures wide-angle orientation shots first to establish context, then progressively moves to mid-range and finally close-up detail shots.

Question 183: Under OSHA 1926.1402, what must be done when a crane is set up on a surface where ground bearing capacity is uncertain?

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

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

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

Question 184: How often must personal fall arrest system components be inspected by the user?

Before each use (Correct answer)
Weekly
Annually
Monthly

Correct answer: Before each use

OSHA requires that workers inspect all fall protection equipment before each use to identify defects, damage, or deterioration.

Question 185: Which document formally records that a specific worker received, understood, and acknowledged safety training on a given topic and date?

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

Correct answer: Training attendance and comprehension acknowledgment form

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

Question 186: A construction safety manager is investigating a recurring near-miss involving struck-by incidents from overhead crane operations. Which investigation technique is BEST suited for uncovering systemic failures rather than attributing fault to individual workers?

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

Correct answer: 5 Why Analysis

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

Question 187: A CHST is selecting hearing protection for workers exposed to 95 dB(A) TWA. The chosen earmuffs have an NRR of 25. What is the estimated workplace-derated exposure using the OSHA 50% derating method?

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

Correct answer: 83.5 dB(A)

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

Question 188: A concrete pump hose whips free under pressure and strikes a worker. This is classified as which OSHA Fatal Four hazard type?

Electrocution
Caught-in/between
Struck-by (Correct answer)
Fall

Correct answer: Struck-by

A pressurized hose whipping and hitting a worker is a struck-by event — the worker is hit by a moving object with force. OSHA's struck-by category includes projectiles, flying objects, and moving equipment/materials.

Question 189: Which of the following rescue methods is always preferred over all others for confined space rescue per OSHA regulations?

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

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

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

Correct answer: 29 CFR 1926.102

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

Question 191: Under OSHA 1904.7, which treatments are considered 'first aid' and therefore do NOT make an injury recordable?

Sutures (stitches) applied by a physician
Use of non-prescription medications at non-prescription strength, wound closure using butterfly bandages, use of elastic bandages, and irrigation of the eye with water (Correct answer)
Prescription-strength medication provided by a doctor
X-rays taken to rule out a fracture

Correct answer: Use of non-prescription medications at non-prescription strength, wound closure using butterfly bandages, use of elastic bandages, and irrigation of the eye with water

OSHA 1904.7(a) defines first aid as including non-prescription medication at non-prescription strength, wound closure using butterflies or steri-strips, use of elastic bandages, irrigation with eye wash, and similar treatments.

Question 192: During a site walkthrough, a safety technician observes a pallet of materials partially blocking a designated emergency exit route from a building. This condition is a violation primarily because it:

could cause damage to the stored materials.
impedes free and unobstructed egress during an emergency. (Correct answer)
violates the site's general housekeeping program.
creates a minor trip hazard for daily work.

Correct answer: impedes free and unobstructed egress during an emergency.

OSHA 29 CFR 1926.34(a) requires that exits be arranged and maintained to provide 'free and unobstructed egress from all parts of the building or structure at all times when it is occupied.' While it is also a housekeeping issue and a trip hazard, the most critical violation is the obstruction of a required means of egress for an emergency.

Question 193: Which type of confined space hazard is classified as an 'engulfment' hazard under OSHA's confined space standard?

Entanglement with rotating machinery inside a tank
Being surrounded and captured by liquid or finely divided solid material (Correct answer)
Exposure to electrical wiring in a vault
Asphyxiation from oxygen-deficient atmosphere

Correct answer: Being surrounded and captured by liquid or finely divided solid material

Engulfment specifically refers to the surrounding and effective capture of a person by liquid or finely divided solid material such as grain, sand, or slurry.

Question 194: What class of hard hat is required when workers are exposed to high-voltage electrical hazards exceeding 20,000 volts?

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

Correct answer: Class E — electrical

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

Question 195: What is the maximum free-fall distance allowed when using a personal fall arrest system under OSHA 1926.502?

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

Correct answer: 6 feet

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

Question 196: A rigger notices that a wire rope sling has a kink that cannot be straightened. What should the rigger do?

Use the sling at reduced capacity
Tag and remove the sling from service (Correct answer)
Continue use if the kink is not at the choker point
Straighten the kink using a pipe for leverage

Correct answer: Tag and remove the sling from service

A kinked wire rope sling is permanently damaged and weakened; it must be removed from service and destroyed.

Question 197: When investigating a near-miss event involving a scaffold plank failure, the investigator should FIRST:

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

Correct answer: Photograph and preserve the scene before disturbance

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

Question 198: Under OSHA's emergency action plan requirements (29 CFR 1910.38), what minimum element must be addressed regarding employee roles?

Assignment of rescue and medical duties to specific employees (Correct answer)
List of emergency equipment vendors
Building materials inventory
Daily safety briefing schedule

Correct answer: Assignment of rescue and medical duties to specific employees

OSHA requires emergency action plans to designate employees who have special roles in rescue and medical duties during emergencies.

Question 199: A worker is sandblasting a structure coated with lead paint. Which combination of respiratory protection is MOST appropriate?

N95 disposable filtering facepiece
Half-face air-purifying respirator with P100 filters
Powered air-purifying respirator (PAPR) with organic vapor cartridges
Supplied-air respirator (SAR) in pressure-demand mode (Correct answer)

Correct answer: Supplied-air respirator (SAR) in pressure-demand mode

Supplied-air respirators in pressure-demand mode provide the highest protection factor required for abrasive blasting operations involving lead-containing coatings.

Question 200: A rescue retrieval system for permit-required confined spaces adjacent to a trench must be capable of retrieving workers without requiring rescuers to:

Enter the confined space (Correct answer)
Carry radio communications
Use fall arrest equipment
Wear respiratory protection

Correct answer: Enter the confined space

OSHA 1910.146(k)(3) requires non-entry rescue systems so rescuers can retrieve workers without entering the hazardous space themselves.

CHST (Construction Health and Safety Technician) Exam

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

200

Questions

240 min

Time Limit

68%

To Pass

Checking for saved progress...

Exam Rules

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