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Health and Safety Technician practice questions

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Question 1CHST examination content area 1 (blueprint not enumerated in source)

A construction safety technician is reviewing the written hazard communication program for a site where employees handle silica-containing concrete. Under OSHA's Hazard Communication Standard, which element must the employer include in the written program?

  1. A schedule of disciplinary actions for chemical exposure incidents
  2. An inventory of known hazardous chemicals present and methods the employer will use to inform employees of hazards Correct answer.
  3. A list of employees who have refused to wear respiratory protection
  4. A copy of each supplier's confidential business information agreement

Explanation

The Hazard Communication Standard requires a written program that describes how the employer will meet the standard, including a list of hazardous chemicals and how hazard information will be communicated. Disciplinary schedules and confidential business agreements are not required components of the written program.

Question 2CHST examination content area 1 (blueprint not enumerated in source)

An employee works in a permit-required confined space. Which condition specifically defines the space as permit-required rather than a non-permit space?

  1. The space contains a hazardous atmosphere or a potential engulfment hazard Correct answer.
  2. The space has limited entry and exit
  3. The space is located below grade level
  4. The space is entered through a top-mounted manhole

Explanation

A permit-required confined space has one or more of the following: a hazardous atmosphere, engulfment potential, an internal configuration that could trap an entrant, or any other recognized serious safety or health hazard. Limited entry and exit alone defines a confined space, not a permit-required one.

Question 3CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is selecting eye protection for workers using a bench grinder that generates flying metal particles. Which marking on the protective device confirms it meets the relevant impact-protection requirement?

  1. A Z87 marking indicating compliance with the applicable ANSI standard Correct answer.
  2. A plus sign (+) impact rating
  3. A CE mark alone
  4. A manufacturer's lot number

Explanation

Eye and face protection must comply with ANSI Z87.1, and compliant devices carry the Z87 marking on the lens or frame. The marking shows the device has been tested for impact and other hazards covered by that standard.

Question 4CHST examination content area 1 (blueprint not enumerated in source)

During a site walk, a technician observes a crane lifting a load over an area where workers are walking. Which control should be implemented first to protect those workers?

  1. Require workers to wear hard hats in the area
  2. Post a warning sign at the site entrance
  3. Assign a spotter to watch the load
  4. Barricade the area and prohibit workers from walking under the suspended load Correct answer.

Explanation

In the hierarchy of controls, eliminating exposure is preferred, so the area under a suspended load should be barricaded and entry prohibited. PPE and warning signs are lower-level controls that do not remove the struck-by hazard.

Question 5CHST examination content area 1 (blueprint not enumerated in source)

A worker is exposed to noise measured at a time-weighted average of 90 dBA over an 8-hour shift. Under OSHA's occupational noise standard, what is the employer required to do?

  1. Take no action because exposure is below the action level
  2. Provide hearing protection and implement a hearing conservation program Correct answer.
  3. Provide hearing protection only if the worker requests it
  4. Only retest the worker after one year

Explanation

The hearing conservation program is triggered at an 8-hour TWA of 85 dBA, and at 90 dBA the employer must also provide hearing protection and ensure feasible engineering or administrative controls are used. At 90 dBA the exposure exceeds the action level, so a program is mandatory.

Question 6CHST examination content area 1 (blueprint not enumerated in source)

Which document must accompany a hazardous chemical shipped to a job site and provide information on its hazards, handling, and emergency measures?

  1. A certificate of insurance
  2. A safety data sheet Correct answer.
  3. A material requisition form
  4. A bill of lading

Explanation

The safety data sheet, provided by the manufacturer or importer, contains the hazard information employees need, organized into the standard 16 sections. Employers must maintain SDSs and make them accessible to workers.

Question 7CHST examination content area 1 (blueprint not enumerated in source)

An employer is establishing a respiratory protection program. Which element is required when respirators are necessary to protect employee health?

  1. Fit testing and medical evaluation before use Correct answer.
  2. Voluntary use acknowledgment forms only
  3. A respirator for each family member
  4. Annual respirator color-coding

Explanation

A written respiratory protection program must include medical evaluation, fit testing, training, and maintenance procedures when respirators are required. Fit testing and medical clearance must occur before the employee uses a respirator in the workplace.

Question 8CHST examination content area 1 (blueprint not enumerated in source)

A technician is reviewing a fall protection plan for workers on a steel erection site. At what height must conventional fall protection generally be provided for employees engaged in other than leading-edge work?

  1. 10 feet
  2. 4 feet
  3. 15 feet
  4. 6 feet Correct answer.

Explanation

OSHA's general fall protection trigger for construction is 6 feet above a lower level for most work, with specific exceptions such as certain steel erection activities. The 4-foot trigger applies in general industry, and 10 feet applies to scaffolding.

Question 9CHST examination content area 1 (blueprint not enumerated in source)

An excavation 6 feet deep is being dug in unstable soil with no adjacent structures. Which protective measure is required for employees who must enter the excavation?

  1. Daily visual inspection by any employee
  2. Warning tape around the perimeter only
  3. A ladder placed every 50 feet
  4. A protective system such as sloping, shoring, or a trench shield Correct answer.

Explanation

Excavations 5 feet or deeper require a protective system unless the excavation is made entirely in stable rock. Sloping, benching, shoring, or shielding must be selected based on soil classification and depth.

Question 10CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is calculating the severity of an incident. Which measure best represents the number of lost workdays per 100 full-time workers for a given period?

  1. Days away, restricted, or transferred rate Correct answer.
  2. Total recordable incident rate
  3. Frequency rate
  4. Experience modification rate

Explanation

The DART rate measures cases involving days away from work, restricted work, or job transfer per 100 full-time workers. It is calculated using hours worked and is a key severity indicator used in safety program evaluation.

Question 11CHST examination content area 1 (blueprint not enumerated in source)

A worker enters a permit space and the atmospheric monitor alarms for hydrogen sulfide at 15 ppm. Which action is appropriate?

  1. Evacuate the space and ventilate before re-entry Correct answer.
  2. Don the respirator and continue without notifying the attendant
  3. Continue working and retest in 30 minutes
  4. Increase the work rate to finish quickly

Explanation

An atmospheric alarm indicates the space no longer meets entry conditions, and entrants must evacuate immediately. The space must be ventilated and retested before re-entry, and the attendant must be informed.

Question 12CHST examination content area 1 (blueprint not enumerated in source)

A technician is evaluating a task that requires lifting heavy equipment. According to ergonomic principles, which approach most effectively reduces the risk of musculoskeletal injury?

  1. Require workers to lift with a straight back and bent knees only
  2. Use mechanical aids or team lifting to reduce the load Correct answer.
  3. Rotate workers every 10 minutes
  4. Provide back belts to all workers

Explanation

Engineering controls such as mechanical lifting aids or team lifting reduce the physical demand on the worker and are more effective than relying on body mechanics alone. Back belts and rotation are not proven to prevent musculoskeletal injuries.

Question 13CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a lockout/tagout procedure for a machine with multiple energy sources. Which step must occur before maintenance begins?

  1. Test the machine by briefly energizing it
  2. Notify the operator and begin work
  3. Isolate all energy sources, apply locks and tags, and verify zero energy Correct answer.
  4. Apply a tag without a lock

Explanation

The control of hazardous energy requires isolating all energy sources, applying locks and tags, and verifying that the equipment is de-energized before work begins. Verification is essential to confirm the isolation was effective.

Question 14CHST examination content area 1 (blueprint not enumerated in source)

A worker is exposed to lead during a renovation project. Which requirement applies under OSHA's lead standard for construction?

  1. Exposure monitoring and medical surveillance when exposure exceeds the action level Correct answer.
  2. No monitoring if the work lasts less than one shift
  3. Air sampling only after symptoms appear
  4. Respirators only for workers over age 50

Explanation

The lead standard requires exposure monitoring when there is reason to believe exposure may exceed the action level, and medical surveillance when exposures exceed the specified levels. Monitoring must be performed regardless of shift length if exposure is possible.

Question 15CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is investigating a near-miss involving a scaffold plank that slipped. Which investigative approach best supports identifying root causes?

  1. Use a structured method such as fault-tree or five-whys analysis with worker input Correct answer.
  2. Record the event as non-recordable and take no further action
  3. Assign discipline to the worker who placed the plank
  4. Interview only the supervisor and close the case

Explanation

Root-cause analysis uses structured techniques and input from those involved to identify underlying system failures rather than blame. This approach supports corrective actions that prevent recurrence.

Question 16CHST examination content area 1 (blueprint not enumerated in source)

A crane is operating near a power line. Which control is required to protect workers from electrocution?

  1. Require rubber gloves for all ground workers
  2. Ground the crane operator
  3. Maintain the required clearance distance and use a spotter or proximity alarm Correct answer.
  4. Operate only during daylight

Explanation

Cranes must maintain the specified minimum clearance from energized lines, and the employer must use measures such as spotters, proximity alarms, or de-energizing and grounding the lines. Grounding the operator or requiring gloves for ground workers does not address the crane's clearance hazard.

Question 17CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a chemical for which the safety data sheet lists a flash point of 40 degrees Fahrenheit. Which hazard does this indicate?

  1. The material will ignite at room temperature
  2. The material is a flammable liquid with potential for ignition below ambient temperatures Correct answer.
  3. The material is noncombustible
  4. The material is safe to use near open flames

Explanation

A flash point below 100 degrees Fahrenheit indicates a flammable liquid that can release ignitable vapors at or below ambient temperatures. The lower the flash point, the greater the fire hazard.

Question 18CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a written emergency action plan. Which element must the plan include?

  1. Procedures for reporting emergencies and accounting for employees after evacuation Correct answer.
  2. A list of employee home addresses
  3. A copy of the company's marketing plan
  4. A schedule of annual salary reviews

Explanation

An emergency action plan must include procedures for reporting emergencies, evacuation routes, accounting for employees after evacuation, and rescue duties. These elements ensure a coordinated and safe response.

Question 19CHST examination content area 1 (blueprint not enumerated in source)

A worker is using a portable circular saw. Which safety practice is most appropriate?

  1. Disconnect the grounding pin to fit an older outlet
  2. Secure the workpiece and allow the blade to reach full speed before cutting Correct answer.
  3. Remove the lower guard to improve visibility
  4. Use the saw with one hand while holding the material with the other

Explanation

Securing the workpiece and allowing the blade to reach full speed before cutting reduces kickback and control loss. Guards must remain in place, and grounding pins must never be removed.

Question 20CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating heat stress on a roofing crew during summer. Which combination of controls is most effective?

  1. Require heavy clothing to block the sun
  2. Encourage workers to drink only at the end of the shift
  3. Provide water, rest breaks, shade, and acclimatization for new workers Correct answer.
  4. Provide salt tablets and reduce breaks

Explanation

Heat illness prevention relies on water, rest, shade, and gradual acclimatization, especially for new or returning workers. These measures reduce heat load and allow the body to adapt.

Question 21CHST examination content area 1 (blueprint not enumerated in source)

A technician is analyzing injury data and finds that a single department accounts for a disproportionate number of hand lacerations. Which action best reflects a systems approach to reducing these injuries?

  1. Require gloves only after an injury occurs
  2. Discipline the workers with the most lacerations
  3. Post a memo reminding workers to be careful
  4. Introduce engineering controls such as guards and cut-resistant tooling, then evaluate results Correct answer.

Explanation

A systems approach addresses the underlying causes through engineering controls and evaluates their effectiveness with data. This reduces reliance on worker behavior and discipline.

Question 22CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a permit-required confined space entry where the attendant must leave the entry point briefly. What is the correct action?

  1. Another entrant may serve as attendant while working inside
  2. The attendant may leave if the entrants are experienced
  3. The entrants must exit the space before the attendant leaves the entry point Correct answer.
  4. The attendant may leave if a sign is posted

Explanation

The attendant must remain at the entry point whenever entrants are inside the space, and if the attendant must leave, entrants must exit first. The attendant's duties include monitoring and summoning rescue.

Question 23CHST examination content area 1 (blueprint not enumerated in source)

A technician is evaluating a fall arrest system where the anchorage is located at foot level. Which consideration is most critical?

  1. The lanyard length must be doubled
  2. The harness must be worn over a jacket
  3. The anchorage must be painted orange
  4. The free-fall distance and potential for contact with lower levels must be calculated, including swing hazards Correct answer.

Explanation

Foot-level anchorage increases free-fall distance and can create swing-fall hazards, so the system must be evaluated to ensure total fall distance and clearance are adequate. Swing hazards must also be addressed to prevent striking structures.

Question 24CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is assessing a trench adjacent to a building foundation. The soil is classified as Type B, and the trench is 8 feet deep. Which protective system consideration is most appropriate?

  1. Shoring is prohibited near foundations
  2. A trench shield may be used without considering the adjacent structure
  3. No protective system is needed because the soil is Type B
  4. Sloping at a 1:1 ratio may be acceptable, but the adjacent foundation load must be evaluated Correct answer.

Explanation

Type B soil generally requires sloping at 1:1, but an adjacent foundation imposes surcharge loads that must be evaluated by a competent person. Protective systems must account for both soil type and nearby structures.

Question 25CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing an employer's hazard assessment for PPE. Which element is required to determine appropriate PPE?

  1. A review of the company's profit margin
  2. A copy of the collective bargaining agreement
  3. A walkthrough survey to identify hazards and document the assessment Correct answer.
  4. A list of employee birthdays

Explanation

The PPE hazard assessment requires a walkthrough survey to identify sources of hazards and documentation of the assessment. This informs the selection of appropriate protective equipment.

Question 26CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing the employer's written hazard communication program. Which element is required in the program?

  1. A schedule for annual physical exams for all employees
  2. A list of all hazardous chemicals known to be present in the workplace Correct answer.
  3. A roster of employees trained in first aid and CPR
  4. A detailed floor plan showing the location of each fire extinguisher

Explanation

OSHA's Hazard Communication Standard requires employers to maintain a written program that includes an inventory of hazardous chemicals, SDSs, and labeling. The other items are not required elements of the hazard communication program.

Question 27CHST examination content area 1 (blueprint not enumerated in source)

A construction crew is using a portable generator to power tools. To control carbon monoxide exposure, which practice is most appropriate?

  1. Place the generator inside the building to protect it from weather
  2. Run the generator in the basement and open a window for ventilation
  3. Place the generator near the work area so extension cords can be short
  4. Operate the generator outdoors away from air intakes and openings Correct answer.

Explanation

Carbon monoxide is a colorless, odorless gas produced by fuel-burning equipment. Generators must be operated outdoors, away from windows, doors, and air intakes to prevent CO from entering occupied spaces.

Question 28CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is selecting eye protection for workers using a bench grinder. Which type of protection is most appropriate?

  1. Safety glasses with side shields
  2. A welding helmet with a filter lens
  3. Chemical splash goggles
  4. A face shield worn over safety glasses Correct answer.

Explanation

Bench grinding produces flying particles that can strike the face and eyes; a face shield provides primary protection for the face, and safety glasses underneath protect the eyes if the shield is lifted or particles bypass it. Safety glasses alone do not protect the full face from larger particles.

Question 29CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing housekeeping on a construction site. Which practice best reduces slip, trip, and fall hazards?

  1. Stacking scrap lumber near stairways for later removal
  2. Sweeping debris and keeping walkways clear at all times Correct answer.
  3. Allowing cords to cross walkways if marked with tape
  4. Storing materials in walkways to keep them visible

Explanation

Good housekeeping requires keeping walking-working surfaces clear of debris, cords, and materials. Regular cleaning and immediate removal of scrap reduce the likelihood of slips, trips, and falls.

Question 30CHST examination content area 1 (blueprint not enumerated in source)

A worker is exposed to noise at 95 dBA over an 8-hour shift. According to OSHA, which action is required?

  1. No action is required because 95 dBA is below the 100 dBA limit
  2. A hearing conservation program must be implemented Correct answer.
  3. Only a warning sign must be posted at the entrance
  4. The worker must be removed from the area immediately

Explanation

OSHA's noise standard requires a hearing conservation program when exposures equal or exceed an 8-hour time-weighted average of 85 dBA. At 95 dBA, the employer must provide monitoring, audiometric testing, hearing protection, and training.

Question 31CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is inspecting a portable extension ladder before use. Which condition requires the ladder to be removed from service?

  1. A label that is faded but legible
  2. Minor scratches on the rungs
  3. A missing ladder safety shoe Correct answer.
  4. Loose paint on the side rails

Explanation

Ladders with structural defects, including missing safety shoes, must be removed from service and repaired or destroyed. Safety shoes prevent slipping and are essential for stability.

Question 32CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing the use of a powder-actuated tool. Which practice is required to protect workers?

  1. Wearing eye and hearing protection during operation Correct answer.
  2. Using the tool in a crowded area without barriers
  3. Pointing the tool toward the work surface before loading
  4. Loading the tool before climbing a ladder

Explanation

Powder-actuated tools produce high noise levels and flying debris, so eye and hearing protection are required. The tool must be loaded only when ready to use and never pointed at people.

Question 33CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a workplace for ergonomic risk factors. Which condition is a recognized ergonomic hazard?

  1. Repetitive motion with insufficient recovery time Correct answer.
  2. Using a keyboard with a wrist rest
  3. Working at a desk with adjustable height
  4. Lifting objects close to the body

Explanation

Repetitive motion without adequate recovery is a key ergonomic risk factor for musculoskeletal disorders. Adjustable workstations and proper lifting techniques reduce risk.

Question 34CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a permit-required confined space entry. Which condition requires the entry to be classified as permit-required?

  1. The space is entered through a top opening
  2. The space has limited means of egress
  3. The space contains a hazardous atmosphere Correct answer.
  4. The space is not designed for continuous occupancy

Explanation

A confined space becomes permit-required if it contains a hazardous atmosphere or has the potential to contain one, among other hazards. Limited egress and non-occupancy are defining features of a confined space, not necessarily permit-required conditions.

Question 35CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is developing a lockout/tagout program for a machine with multiple energy sources. Which step must be performed before applying locks and tags?

  1. Verify isolation by attempting to start the machine
  2. Apply locks to each energy-isolating device
  3. Release stored energy from springs and capacitors
  4. Notify affected employees and shut down the machine Correct answer.

Explanation

The lockout/tagout sequence begins with notification of affected employees and orderly shutdown. Isolation, lock application, release of stored energy, and verification follow in that order.

Question 36CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is investigating a worker's fall from a ladder. Which factor is most likely to be a root cause rather than an immediate cause?

  1. The worker was carrying a heavy tool bag
  2. The worker was not trained in ladder inspection Correct answer.
  3. The worker lost balance
  4. The ladder was placed on uneven ground

Explanation

Root causes are underlying system deficiencies, such as lack of training or inadequate procedures, that allow unsafe conditions to persist. Immediate causes are the direct actions or conditions at the time of the incident.

Question 37CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a chemical with a flash point of 100°F. How should the chemical be classified?

  1. A non-flammable liquid
  2. A reactive liquid
  3. A flammable liquid
  4. A combustible liquid Correct answer.

Explanation

Under OSHA's hazard communication standard, a liquid with a flash point at or above 100°F and below 200°F is classified as combustible. Flammable liquids have flash points below 100°F.

Question 38CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a fall protection plan for workers on a scaffold. Which height triggers the requirement for personal fall arrest systems on a scaffold?

  1. 6 feet
  2. 15 feet
  3. 4 feet
  4. 10 feet Correct answer.

Explanation

OSHA requires personal fall arrest systems or guardrails for employees on scaffolds at heights of 10 feet or more above a lower level. The 6-foot trigger applies to general industry fall protection, not scaffolds.

Question 39CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating an excavation 5 feet deep in stable soil. Which protection is required for workers entering the excavation?

  1. No protection is required because the depth is less than 6 feet
  2. Only a warning line is required around the perimeter
  3. A protective system must be used unless the excavation is inspected by a competent person Correct answer.
  4. An adequate protective system is required regardless of depth

Explanation

OSHA requires a protective system for excavations 5 feet or deeper unless the excavation is made entirely in stable rock or a competent person determines there is no indication of potential cave-in. A competent person must inspect the excavation.

Question 40CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing a respiratory protection program. Which element is required when respirators are necessary to protect employee health?

  1. Annual fit testing for all employees
  2. Voluntary use of filtering facepieces
  3. Medical evaluation before fit testing and use Correct answer.
  4. A written certification of hazard assessment

Explanation

OSHA requires a medical evaluation before an employee is fit tested or required to use a respirator. Fit testing is required annually, but medical evaluation must precede it.

Question 41CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is assessing a worker who is exposed to silica dust during concrete cutting. Which control is most effective for reducing exposure?

  1. Rotating workers to limit exposure time
  2. Wearing a disposable dust mask
  3. Posting warning signs in the work area
  4. Using water to suppress dust at the point of cutting Correct answer.

Explanation

Wet cutting suppresses silica dust at the source and is an effective engineering control. Respirators and administrative controls are secondary measures.

Question 42CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a crane operation near a power line. Which measure is required to protect workers?

  1. Equipping the crane with a proximity alarm only
  2. Installing a warning line at the crane's swing radius
  3. Using a spotter to warn the operator
  4. De-energizing and grounding the line, or maintaining the required clearance Correct answer.

Explanation

OSHA requires that power lines be de-energized and grounded, or that the required clearance be maintained, when cranes operate near them. Spotters and alarms are supplementary and do not replace the primary control.

Question 43CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is reviewing an emergency action plan. Which element must be included?

  1. Procedures for reporting fires and other emergencies Correct answer.
  2. A schedule for annual fire extinguisher maintenance
  3. A list of employees' medical conditions
  4. The location of the nearest hospital

Explanation

An emergency action plan must include procedures for reporting emergencies, evacuation routes, accounting for employees, and rescue duties. Medical information and extinguisher maintenance schedules are not required elements.

Question 44CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is analyzing injury data and finds that a single department has a higher rate of hand lacerations. Which action is most appropriate for the technician to take first?

  1. Increase the frequency of safety meetings for all employees
  2. Discipline the department supervisor for poor performance
  3. Review incident reports and observe tasks to identify common causes Correct answer.
  4. Implement a mandatory glove policy for the entire facility

Explanation

Before selecting controls, the technician should investigate the specific tasks and causes of lacerations in that department. Targeted analysis allows controls to be matched to the actual hazards.

Question 45CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a worker who must enter a permit space where the attendant cannot maintain contact with the entrant. Which action is required?

  1. The attendant may leave the area to summon help
  2. The entry may proceed if the entrant carries a radio
  3. The entry must be prohibited unless the attendant can maintain contact Correct answer.
  4. The entry may proceed if the space is ventilated

Explanation

The attendant must remain at the entry point and maintain contact with entrants. If the attendant cannot maintain contact, the entry must be prohibited or the attendant replaced.

Question 46CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a fall arrest system where the anchorage is located at foot level. Which consideration is most critical?

  1. The anchorage must be capable of supporting at least 5,000 pounds per worker
  2. The lanyard must be equipped with a deceleration device
  3. The free fall distance must be limited to 6 feet Correct answer.
  4. A swing fall hazard may increase the fall distance

Explanation

When the anchorage is at foot level, a worker can free fall more than 6 feet before the system activates. The system must limit free fall to 6 feet or less, often by using a ladder climbing device or a self-retracting lifeline.

Question 47CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is assessing a trench adjacent to a building foundation. The soil is classified as Type B, and the trench is 8 feet deep. Which protective system is required?

  1. Benching the trench walls in Type B soil
  2. Sloping the trench walls to 45 degrees
  3. No protective system because the trench is less than 10 feet deep
  4. Shoring or shielding designed for Type B soil Correct answer.

Explanation

Type B soil in an 8-foot trench requires a protective system such as shoring, shielding, or sloping. Benching is not permitted in Type B soil, and sloping angles depend on soil type.

Question 48CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is evaluating a worker's exposure to a chemical with an OSHA permissible exposure limit (PEL) of 50 ppm as an 8-hour TWA. Sampling shows an 8-hour TWA of 75 ppm. Which action is required?

  1. The employer must provide only a dust mask
  2. No action is required because the exposure is below the excursion limit
  3. The employer must immediately evacuate the facility
  4. The employer must implement engineering and work practice controls and provide respiratory protection as needed Correct answer.

Explanation

Exposure above the PEL requires the employer to implement feasible engineering and work practice controls and to provide respiratory protection until controls are in place. The other options do not reflect the standard's requirements.

Question 49CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is investigating a near-miss where a load slipped from a crane's rigging. Which factor is most indicative of a systemic root cause?

  1. The load was heavier than expected
  2. The rigging inspection program was not followed Correct answer.
  3. The rigger used an incorrect hitch
  4. The crane operator was distracted

Explanation

A root cause is a system-level deficiency, such as a lapsed inspection program, that allows unsafe conditions to recur. Individual errors and unexpected load weights are immediate causes.

Question 50CHST examination content area 1 (blueprint not enumerated in source)

A safety technician is calculating a DART rate for a site that recorded 6 days-away, restricted, or transferred cases during a year with 500,000 hours worked. What is the DART rate (per 100 full-time workers)?

  1. 12.0
  2. 2.4 Correct answer.
  3. 1.2
  4. 0.6

Explanation

The DART rate equals (number of DART cases × 200,000) ÷ total hours worked. Here 6 × 200,000 = 1,200,000, divided by 500,000 hours gives 2.4. The 200,000 constant represents 100 employees working 40 hours for 50 weeks.