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NCCER CSSS practice questions

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Question 1Safety program management and regulatory compliance (OSHA)

Under OSHA's construction standards, at what height above a lower level must employees be protected from falls when working on an unprotected side or edge?

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

Explanation

29 CFR 1926.501(b)(1) sets the general construction fall-protection trigger at 6 feet above a lower level. Specific activities such as certain scaffolds and steel erection have separate thresholds, so the supervisor must check the applicable subpart before selecting a system.

Question 2Safety program management and regulatory compliance (OSHA)

Which document must an employer obtain for each hazardous chemical used on a construction site and keep readily accessible to employees during each work shift?

  1. Safety Data Sheet (SDS) Correct answer.
  2. OSHA 300 injury log
  3. Hazardous waste manifest
  4. Purchase order

Explanation

The Hazard Communication standard, enforced in construction through 29 CFR 1926.59, requires employers to obtain and maintain a Safety Data Sheet for each hazardous chemical. Employees must be able to access SDSs during their work shift, and training must cover the hazards the SDS describes.

Question 3Safety program management and regulatory compliance (OSHA)

An employer required to keep OSHA injury and illness records must post the OSHA 300A Summary for which period each year?

  1. January 1 through March 31
  2. April 1 through June 30
  3. February 1 through April 30 Correct answer.
  4. March 1 through May 31

Explanation

The 300A summary must be posted in a conspicuous place where notices to employees are normally posted from February 1 through April 30 of the year following the recordable year. Posting informs employees of the prior year's recordable cases and is separate from the five-year retention requirement.

Question 4Safety program management and regulatory compliance (OSHA)

Unless the excavation is made entirely in stable rock, at what depth must an employer use a protective system in a construction excavation?

  1. 4 feet
  2. 5 feet Correct answer.
  3. 6 feet
  4. 10 feet

Explanation

29 CFR 1926.652(a)(1) requires a protective system for excavations 5 feet or deeper unless a competent person examines the site and finds no indication of a potential cave-in. Excavations 20 feet or deeper require a protective system designed by a registered professional engineer.

Question 5Safety program management and regulatory compliance (OSHA)

Who must inspect a supported scaffold before each work shift and after any occurrence that could affect its structural integrity?

  1. The project architect
  2. A competent person Correct answer.
  3. The local OSHA area director
  4. Any employee who will work on the scaffold

Explanation

29 CFR 1926.451(f)(3) assigns these inspections to a competent person selected by the employer. The competent person must be capable of identifying scaffold hazards and must have the authority to take prompt corrective action before employees use the scaffold.

Question 6Safety program management and regulatory compliance (OSHA)

Which item is a required element of a construction emergency action plan under OSHA standards?

  1. A list of each subcontractor's insurance certificates
  2. Procedures for reporting emergencies and accounting for all employees after evacuation Correct answer.
  3. Copies of employees' confidential medical records
  4. A schedule of annual OSHA compliance inspections

Explanation

29 CFR 1926.35 requires the emergency action plan to include escape procedures, critical operations shutdown, accounting for employees after evacuation, rescue duties, and reporting procedures. The plan must be written, except for small employers meeting the standard's exception, and employees must be trained on it.

Question 7Safety program management and regulatory compliance (OSHA)

After completing a workplace hazard assessment for PPE, what must an employer do to document compliance?

  1. Certify the assessment in writing and identify the workplace evaluated Correct answer.
  2. Submit the assessment to OSHA for approval
  3. Post the assessment on the OSHA 300A summary
  4. Repeat the assessment every 30 days and discard the prior one

Explanation

The PPE standard, 29 CFR 1910.132(d)(2), requires a written certification of the hazard assessment that identifies the workplace evaluated, the person certifying, and the date. Construction employers covered by 1926.95 follow the same principle when selecting and requiring PPE.

Question 8Safety program management and regulatory compliance (OSHA)

An employer's own workers are exposed to a fall hazard created by another contractor on a multi-employer site. Under OSHA's multi-employer worksite policy, how may OSHA treat the exposing employer?

  1. OSHA must apply the general duty clause because no specific standard exists
  2. OSHA may cite only the contractor that created the hazard
  3. OSHA may cite the exposing employer for failing to protect its own employees Correct answer.
  4. OSHA cannot act because of the exclusive remedy doctrine

Explanation

OSHA's multi-employer worksite doctrine allows citations of creating, exposing, correcting, and controlling employers. An exposing employer has a duty to protect its own employees even when another contractor created the hazard, and the citation may rest on a specific standard such as fall protection.

Question 9Safety program management and regulatory compliance (OSHA)

Within what time period must an employer report a work-related fatality to OSHA?

  1. 30 days
  2. 24 hours
  3. 8 hours Correct answer.
  4. 72 hours

Explanation

29 CFR 1904.39 requires an employer to report a work-related fatality to OSHA within 8 hours. In-patient hospitalizations, amputations, and losses of an eye must be reported within 24 hours, so supervisors must distinguish the event type before calling.

Question 10Safety program management and regulatory compliance (OSHA)

A supervisor investigating a serious incident finds that a worker bypassed a guard. Which action best reflects root-cause analysis in a safety program?

  1. Examine management systems, training, and equipment conditions that allowed the bypass Correct answer.
  2. Wait for OSHA citations before deciding on corrective action
  3. Record the bypass as the sole cause and rely on discipline alone
  4. Close the investigation once the worker is identified as at fault

Explanation

Root-cause analysis looks beyond the immediate unsafe act to the underlying system conditions, such as inadequate training, production pressure, poor equipment design, or missing supervision. Corrective actions should address those conditions so the same bypass is less likely to recur, rather than stopping at individual blame.

Question 11Safety program management and regulatory compliance (OSHA)

Under OSHA's Hazard Communication Standard, when must an employer provide hazard communication training to employees who may be exposed to hazardous chemicals?

  1. Once every three years, regardless of changes in the workplace
  2. At the time of hire, with no refresher required for newly introduced chemicals
  3. Only after an employee has been involved in a chemical exposure incident
  4. Before initial assignment and when a new chemical hazard is introduced Correct answer.

Explanation

Hazard communication training must be provided at the time of initial assignment and whenever a new chemical hazard is introduced into the employee's work area. The training must address labels, safety data sheets, and protective measures. Incident-driven or fixed-interval-only training does not meet the standard.

Question 12Safety program management and regulatory compliance (OSHA)

How long must an employer keep the OSHA 300 Log of Work-Related Injuries and Illnesses after the end of the calendar year it covers?

  1. Three years
  2. Five years Correct answer.
  3. Ten years
  4. One year

Explanation

OSHA recordkeeping rules require the OSHA 300 Log and related records to be retained for five years following the end of the calendar year to which they relate. The three-month posting period for the OSHA 300A Summary is a separate requirement and does not replace the five-year retention rule.

Question 13Safety program management and regulatory compliance (OSHA)

Under OSHA construction standards, which description best fits the role of a competent person?

  1. An employee who has completed the OSHA 30-hour course and holds a card
  2. A licensed engineer who designs all protective systems on the site
  3. A safety professional employed full time by the general contractor to manage the site program
  4. A person who can identify predictable hazards and has authority to correct them promptly Correct answer.

Explanation

OSHA defines a competent person by the ability to recognize existing and predictable hazards and by authorization to take prompt corrective measures. A training card or job title alone does not establish competent-person status. The key is both hazard recognition and authority to act.

Question 14Safety program management and regulatory compliance (OSHA)

A worker sprains an ankle at work, is evaluated at a clinic, and the physician recommends that the worker stay off work for four days. The worker receives only first-aid treatment. How should the case be recorded on the OSHA 300 Log?

  1. It is recordable as a days-away case, with four days away from work Correct answer.
  2. It is recorded on the OSHA 301 but not on the OSHA 300 Log
  3. It is recordable as a job transfer or restriction case only
  4. It is not recordable because the treatment was first aid only

Explanation

A work-related injury is recordable when it results in days away from work, even if the treatment provided is only first aid. Physician-recommended time away from work counts as days away. The case is entered as a days-away case rather than only as a restriction case.

Question 15Safety program management and regulatory compliance (OSHA)

During an OSHA workplace inspection, which activity is consistent with the agency's walkaround procedures?

  1. The compliance officer may be accompanied by employer and employee representatives Correct answer.
  2. The compliance officer must disclose all employee interview notes before leaving the site
  3. The compliance officer must conduct all interviews in the presence of the employer's attorney
  4. The employer may select which production areas the compliance officer is allowed to inspect

Explanation

OSHA walkaround procedures allow the employer's representative and an authorized employee representative to accompany the compliance officer during the inspection. Employees also have the right to be interviewed privately. The employer cannot unilaterally dictate the inspection scope when OSHA has proper authority.

Question 16Safety program management and regulatory compliance (OSHA)

Under OSHA's lockout/tagout standard, how often must an employer conduct a periodic inspection of the energy control procedure?

  1. Quarterly
  2. Every three years
  3. At least annually Correct answer.
  4. Monthly

Explanation

The lockout/tagout standard requires a periodic inspection of the energy control procedure at least annually. The inspection must be performed by an authorized employee other than the one using the procedure being inspected. It is intended to verify that the procedure and employee understanding remain adequate.

Question 17Safety program management and regulatory compliance (OSHA)

An employer has trained employees on the PPE required for their tasks. Which change requires the employer to retrain affected employees?

  1. The employer adds a monthly toolbox talk on an unrelated topic
  2. An employee requests a second pair of the same gloves
  3. Workplace changes make the previous PPE training obsolete Correct answer.
  4. The supplier changes the color of the same model of safety glasses

Explanation

OSHA's PPE training requirements include retraining when workplace changes make the previous training obsolete or when an employee lacks the understanding needed to use PPE properly. A cosmetic change to the same model or an extra pair of identical gloves does not trigger retraining. The focus is on whether the training remains adequate for the current hazards and equipment.

Question 18Safety program management and regulatory compliance (OSHA)

After OSHA issues a citation to an employer, what must the employer do with the citation document while abatement is pending?

  1. Keep it in the corporate safety file only
  2. Post it in the employee break room for one full calendar year after issuance
  3. Send it to each employee by certified mail within 24 hours
  4. Post it at or near the violation for three working days or until corrected Correct answer.

Explanation

OSHA requires the employer to post a copy of the citation at or near the place where the violation occurred. The copy must remain posted for three working days or until the violation is corrected, whichever is later. This gives affected employees notice of the hazard and the required abatement.

Question 19Safety program management and regulatory compliance (OSHA)

An employee believes they were fired in retaliation for reporting an OSHA violation to the employer. Under OSHA Section 11(c), within what period must the employee file a discrimination complaint with OSHA?

  1. 10 calendar days
  2. 60 calendar days
  3. 180 calendar days
  4. 30 calendar days Correct answer.

Explanation

Section 11(c) retaliation complaints must be filed with OSHA within 30 calendar days after the alleged discriminatory action. This short filing period is intended to allow prompt investigation of retaliation claims. Missing the deadline can bar the complaint.

Question 20Safety program management and regulatory compliance (OSHA)

OSHA classifies a violation as repeated when which condition is met?

  1. The employer has never been inspected, but the hazard is recognized in the industry
  2. An employee was injured by the hazard on two separate shifts
  3. A prior final citation for the same or a substantially similar condition Correct answer.
  4. The employer corrected the hazard only after the compliance officer pointed it out

Explanation

A repeated violation generally requires a prior citation for the same or a substantially similar condition, and that prior citation must have become final. The repeat classification is based on the employer's citation history, not merely on two injury events or on correcting a hazard after it is identified.

Question 21Safety program management and regulatory compliance (OSHA)

An employer keeps OSHA injury and illness records and must document the details of how each recorded case occurred. Which form is used to complete that incident-specific information for an individual work-related injury or illness?

  1. OSHA Form 300, Log of Work-Related Injuries and Illnesses
  2. OSHA Form 101, Employer's First Report of Injury
  3. OSHA Form 301, Injury and Illness Incident Report Correct answer.
  4. OSHA Form 300A, Summary of Work-Related Injuries and Illnesses

Explanation

The OSHA Form 301 Incident Report collects the details of a single recorded injury or illness, including how and when the event occurred. The Form 300 is the chronological log of cases, and the Form 300A is the annual summary of those totals. Form 101 is not the OSHA recordkeeping form used for this purpose.

Question 22Safety program management and regulatory compliance (OSHA)

Under OSHA's Hazard Communication Standard, what must an employer maintain at each workplace where hazardous chemicals are present in addition to container labels and safety data sheets?

  1. An archive of material safety data sheets kept for 30 years
  2. A chemical inventory submitted to OSHA each year
  3. A certified industrial hygiene sampling plan
  4. A written hazard communication program Correct answer.

Explanation

The Hazard Communication Standard requires employers to develop and maintain a written program describing how labels, safety data sheets, and training will be managed at the workplace. There is no annual chemical inventory submission to OSHA and no standard requirement for a certified sampling plan. Safety data sheets must be readily accessible, but a fixed 30-year archive is not the required element.

Question 23Safety program management and regulatory compliance (OSHA)

A worker suffers a work-related amputation and is treated at a hospital. Within what time period must the employer report the incident to OSHA?

  1. 24 hours Correct answer.
  2. 7 calendar days
  3. 72 hours
  4. 8 hours

Explanation

OSHA requires employers to report an in-patient hospitalization, amputation, or loss of an eye within 24 hours of learning about the event. Work-related fatalities must be reported within 8 hours. The 7-calendar-day period relates to recording certain injury and illness cases on the OSHA log, not to this reporting duty.

Question 24Safety program management and regulatory compliance (OSHA)

Under OSHA's permit-required confined space standard, which person is authorized to approve entry and ensure that the entry permit is properly completed?

  1. The site safety director
  2. The entry supervisor Correct answer.
  3. The attendant
  4. The authorized entrant

Explanation

The entry supervisor authorizes entry, verifies that acceptable entry conditions exist, and signs the permit. The attendant monitors the entrants and the space from outside, while the entrant performs the work inside the space. A site safety director may provide oversight but does not automatically hold the standard's entry supervisor role.

Question 25Safety program management and regulatory compliance (OSHA)

An employer receives an OSHA citation and believes the alleged violation is incorrect. What must the employer do to preserve the right to contest the citation?

  1. Submit a written notice of contest to the OSHA Area Director within 15 working days Correct answer.
  2. File a petition with the Review Commission within 30 calendar days
  3. Post a written objection next to the citation for 3 working days
  4. Request an informal conference with the Area Director within 5 working days

Explanation

To contest a citation, the employer must file a written notice of contest with the OSHA Area Director within 15 working days of receiving it. An informal conference is optional and does not by itself preserve the contest deadline. A petition to the Review Commission comes later in the appeals process and is not the initial filing.

Question 26Hazard identification, assessment, and control

According to the hierarchy of controls used in construction safety, which measure is the most reliable way to protect workers from a hazard?

  1. Eliminating the hazard from the task Correct answer.
  2. Requiring workers to wear personal protective equipment
  3. Posting warning signs at the work area
  4. Training workers to recognize the hazard

Explanation

Elimination is the most effective control in the hierarchy because it removes the hazard entirely rather than relying on worker behavior or protective equipment. Personal protective equipment, warning signs, and training reduce exposure only after the hazard remains present.

Question 27Hazard identification, assessment, and control

At what minimum height above a lower level must construction workers generally be protected from falls under OSHA's construction fall protection standard?

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

Explanation

OSHA's general construction fall protection standard requires fall protection at 6 feet or more above a lower level, with certain exceptions for specific activities. Employers must select appropriate systems such as guardrails, safety nets, or personal fall arrest.

Question 28Hazard identification, assessment, and control

When employees are working in an excavation, excavated material and equipment must be kept at least how far back from the edge?

  1. 4 feet
  2. 1 foot
  3. 6 feet
  4. 2 feet Correct answer.

Explanation

OSHA requires spoil, equipment, and materials to be kept at least 2 feet from the edge of an excavation to reduce the risk of cave-in and falling objects. The setback helps prevent surcharge loads that can destabilize the excavation walls.

Question 29Hazard identification, assessment, and control

During a job hazard analysis, a supervisor has listed the major steps of a task. What is the next step in the process?

  1. Identify the potential hazards associated with each step Correct answer.
  2. Schedule the task for the next shift
  3. Notify OSHA of the task
  4. Assign personal protective equipment to each worker

Explanation

A job hazard analysis begins by selecting a job and breaking it into sequential steps; the next step is to identify hazards associated with each step. Controls are selected only after the hazards are understood.

Question 30Hazard identification, assessment, and control

Under a lockout/tagout program, when may a lock be removed from an energy-isolating device by someone other than the employee who applied it?

  1. Only under the employer's specific written procedure for that situation Correct answer.
  2. Whenever production needs the equipment restarted
  3. After a verbal announcement over the radio
  4. After the shift ends, by any supervisor

Explanation

Only the authorized employee who applied the lock normally removes it. A different person may remove it only when the employer has a specific written procedure for the situation, such as when the original employee is unavailable.

Question 31Hazard identification, assessment, and control

Before a worker enters a permit-required confined space, in what order should atmospheric testing generally be performed?

  1. Oxygen, flammability, toxicity Correct answer.
  2. Oxygen, toxicity, flammability
  3. Toxicity, oxygen, flammability
  4. Flammability, toxicity, oxygen

Explanation

Atmospheric testing in permit-required confined spaces generally starts with oxygen, then combustible gas or vapor, then toxic contaminants. Testing oxygen first ensures the instrument and the space are safe for further testing and entry.

Question 32Hazard identification, assessment, and control

An employee's hard hat is struck by a falling piece of lumber and shows no visible cracks. What is the correct action?

  1. Inspect it and return to work if the suspension is intact
  2. Paint over the impact area to seal it
  3. Remove it from service and replace it Correct answer.
  4. Continue using it because no damage is visible

Explanation

A hard hat that has sustained a significant impact must be removed from service and replaced, even if no cracks are visible, because the shell may have hidden damage that reduces protection. Painting or inspecting only the suspension does not restore the shell's integrity.

Question 33Hazard identification, assessment, and control

On a construction site, which practice is required for temporary receptacles that are not part of the permanent wiring and are used by employees?

  1. They must be tested monthly by the utility company
  2. They must be protected by ground-fault circuit interrupters Correct answer.
  3. They must be painted orange
  4. They must be mounted at least 10 feet above grade

Explanation

Temporary receptacles on construction sites must be protected by ground-fault circuit interrupters, unless the employer uses an assured equipment grounding conductor program. GFCI protection reduces the risk of electric shock from faulty tools and cords.

Question 34Hazard identification, assessment, and control

Which finding is best classified as a root cause rather than an immediate cause of a struck-by incident?

  1. The excavator operator swung the bucket over a worker
  2. The worker was struck on the shoulder
  3. The site had no traffic-control plan separating equipment and pedestrians Correct answer.
  4. The operator did not sound the horn before swinging

Explanation

A root cause is the underlying system or management condition that allowed the incident to occur, such as the absence of a traffic-control plan separating equipment and pedestrians. The operator's action, the injury, and the failure to sound the horn describe the event or immediate causes rather than the underlying system.

Question 35Hazard identification, assessment, and control

Employees are using a gas-powered saw to cut concrete block. Which control is the primary engineering control for reducing respirable crystalline silica exposure?

  1. Using a saw equipped with a water delivery system Correct answer.
  2. Posting a silica warning sign
  3. Providing N95 respirators to the saw operator
  4. Rotating workers every 30 minutes

Explanation

Using a saw with a water delivery system is an engineering control that suppresses silica dust at the source, making it the primary control for concrete cutting. Respirators and job rotation are less effective supplemental measures, and signs do not reduce exposure.

Question 36Hazard identification, assessment, and control

In the hazard identification process, what does the term risk describe?

  1. The likelihood and severity of harm from a hazard Correct answer.
  2. The physical condition or behavior that can cause harm
  3. The written record of corrective actions after an inspection
  4. The regulation that applies to a worksite activity

Explanation

Risk combines the probability that a hazard will cause harm with the seriousness of the resulting injury or illness. Hazard identification finds the source of harm; risk assessment then evaluates how likely and how severe the harm could be.

Question 37Hazard identification, assessment, and control

Which of the following is best classified as an ergonomic hazard on a construction site?

  1. Repeating an overhead drilling motion for several hours Correct answer.
  2. A missing guard on a portable grinder
  3. A 20-foot drop at an unguarded roof edge
  4. An unlabeled container of a cleaning solvent

Explanation

Ergonomic hazards arise from repetitive motion, awkward postures, forceful exertion, and similar stressors that can cause musculoskeletal injuries. The drilling motion fits that category, while the other options are mechanical, chemical, and fall hazards.

Question 38Hazard identification, assessment, and control

Before starting a day's work, a crew leader holds a short meeting to review the specific hazards and controls for that day's tasks. What is this meeting commonly called?

  1. A pre-task safety meeting Correct answer.
  2. A root-cause analysis
  3. A periodic safety audit
  4. A post-incident critique

Explanation

A tailgate or pre-task safety meeting is held before work to discuss the day's tasks, hazards, and controls with the crew. It is not an investigation, audit, or root-cause analysis, which occur at other stages.

Question 39Hazard identification, assessment, and control

A crew currently uses a solvent-based adhesive that emits strong fumes. To reduce the hazard at the source, which action is an example of substitution?

  1. Using a water-based adhesive with lower toxicity Correct answer.
  2. Posting a sign that limits use to one hour per shift
  3. Training workers to keep the container closed when not in use
  4. Issuing respirators to workers who use the adhesive

Explanation

Substitution replaces a hazardous material or process with a less hazardous alternative, which is a higher-level control than PPE or administrative measures. A water-based adhesive with lower toxicity reduces the hazard at its source.

Question 40Hazard identification, assessment, and control

A risk assessment matrix rates a task as having a high probability of occurrence and a severity that could cause a fatality. How should this risk normally be treated?

  1. Assign it to the least experienced worker to build skill
  2. Require immediate action to reduce the risk Correct answer.
  3. Document it and revisit it at the next annual review
  4. Accept it because construction work always involves some risk

Explanation

A high-probability, high-severity rating places the risk in an unacceptable range, so work should not proceed until the risk is reduced. Accepting or delaying action is inappropriate when fatality potential exists.

Question 41Hazard identification, assessment, and control

A safety manager wants to measure whether hazard controls are working before injuries occur. Which measure is a leading indicator?

  1. The total number of days lost to workplace injuries
  2. The workers' compensation claims filed after incidents
  3. The number of completed hazard reports and near-miss reports Correct answer.
  4. The number of recordable injuries from the past year

Explanation

Leading indicators measure proactive activities, such as hazard reporting and near-miss reporting, that can reveal problems before an injury occurs. Injury counts and workers' compensation claims are lagging indicators because they record harm after the fact.

Question 42Hazard identification, assessment, and control

What best distinguishes a safety audit from a routine safety inspection?

  1. An audit is conducted daily, while an inspection is conducted annually
  2. An audit reviews management systems and program effectiveness Correct answer.
  3. An audit records only injuries, while an inspection records only near misses
  4. An audit is performed only by OSHA, while an inspection is performed only by the employer

Explanation

A safety audit evaluates the management system, program implementation, and effectiveness, while a routine inspection typically checks physical conditions and work practices. Audits are not limited to OSHA or to a daily frequency.

Question 43Hazard identification, assessment, and control

Which situation should prompt a review and update of an existing hazard assessment?

  1. New equipment is introduced to the task Correct answer.
  2. The project schedule includes a lunch break
  3. The crew has worked the same task for six months without incident
  4. The company updates its logo and letterhead

Explanation

A hazard assessment must be reviewed when conditions change, such as new equipment, new chemicals, new procedures, or a change in the workforce. Unchanged routine work and administrative matters like a lunch break or letterhead do not by themselves trigger a review.

Question 44Hazard identification, assessment, and control

Why should employees who perform a task participate in developing its hazard assessment?

  1. They can replace the need for a competent person's review
  2. They can approve the safety budget for corrective actions
  3. They know the task's actual steps, variations, and workarounds Correct answer.
  4. They are legally required to sign the final risk matrix

Explanation

Workers who perform the task know its actual steps, variations, shortcuts, and workarounds, which may not appear in written procedures. Their input improves hazard identification; they do not replace competent-person review or approve budgets.

Question 45Hazard identification, assessment, and control

A subcontractor plans to switch from a diesel-powered generator to a propane-powered generator inside a partially enclosed structure. What is the most appropriate hazard control action before the change?

  1. Conduct a management-of-change review of fire, explosion, and ventilation hazards Correct answer.
  2. Rely on the original hazard assessment because the task location has not changed
  3. Proceed because propane is always safer than diesel
  4. Wait until workers report symptoms before evaluating the change

Explanation

A management-of-change review evaluates how a change affects hazards, including fire, explosion, ventilation, and exposure potential. Assuming a fuel is always safer or waiting for symptoms bypasses the assessment required before the change.

Question 46Hazard identification, assessment, and control

A worker operates a pneumatic hammer for most of a shift and is exposed to high noise levels. Noise is best classified as which type of hazard?

  1. Physical hazard Correct answer.
  2. Biological hazard
  3. Chemical hazard
  4. Ergonomic hazard

Explanation

Noise is a physical hazard because it is energy that can damage hearing. Chemical hazards involve substances, biological hazards involve living organisms, and ergonomic hazards involve strain from force or posture.

Question 47Hazard identification, assessment, and control

A supervisor is preparing a job hazard analysis for a repetitive task. What is the primary purpose of this analysis?

  1. To replace the site-specific safety plan for the entire project
  2. To calculate the project's workers' compensation insurance premium
  3. To assign blame if a worker is injured later on the site
  4. To identify hazards and controls before work begins Correct answer.

Explanation

A job hazard analysis breaks a task into steps and identifies hazards and controls before work starts. It supports planning and communication; it is not a substitute for the site safety plan or a tool for assigning blame.

Question 48Hazard identification, assessment, and control

After noise controls are added at a concrete saw station, dosimetry still shows exposures above the OSHA permissible exposure limit. What is the safety supervisor's best next step?

  1. Rely on hearing protection alone because controls are already installed
  2. Stop all work permanently until the saw is removed from the site
  3. Record the exposure and take no action because dosimetry is advisory
  4. Reassess the task, add feasible controls, and verify exposure again Correct answer.

Explanation

When exposure remains above the permissible limit after controls, the supervisor must reassess and add feasible controls, then verify with monitoring. Hearing protection alone does not satisfy the hierarchy when further engineering or administrative controls are practical.

Question 49Hazard identification, assessment, and control

A worker reports that an extension ladder has a cracked side rail. What is the supervisor's most appropriate immediate action?

  1. Record the report and inspect the ladder at the next monthly inspection
  2. Allow use for the remainder of the shift if the crack is small
  3. Return the ladder to service after wrapping the rail with tape
  4. Remove the ladder from service and tag it as defective Correct answer.

Explanation

A damaged ladder is a hazard that must be removed from service immediately. Tagging and isolating it prevents use until it is repaired or destroyed, protecting workers from a fall.

Question 50Hazard identification, assessment, and control

Workers repeatedly remove a machine guard to clear jams because the guard must be unbolted each time. What does this pattern most likely indicate about the hazard control?

  1. The guard should be removed permanently to improve crew productivity
  2. The hazard has been eliminated because jam clearing is routine
  3. The control does not fit the task and needs redesign Correct answer.
  4. The guard is adequate and only stricter worker discipline is needed

Explanation

Repeated guard bypassing usually signals that the guard interferes with a necessary task such as jam clearing. The control should be redesigned, for example with an interlock or safe clearing procedure, rather than relying on discipline alone.