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Question 1. Which of the following is the primary purpose of a “Stop Work” authority? A) To punish the worker who noticed the hazard B) To allow the supervisor to finish the task first C) To immediately halt operations when an unsafe condition is identified D) To document the incident after it occurs Answer: C Explanation: “Stop Work” empowers any employee to pause work instantly if they perceive a danger, preventing injuries before they happen. Question 2. A red sign on a facility floor most likely indicates: A) General information B) Mandatory PPE required C) Danger – immediate hazard D) Caution – potential hazard Answer: C Explanation: Red is the universal color for Danger signs, signaling an immediate risk of injury or death. Question 3. Under the Hazard Communication standard, which section of an SDS provides information on fire-fighting measures? A) Section 4 – First-Aid Measures B) Section 5 – Fire-Fighting Measures C) Section 8 – Exposure Controls/Personal Protection D) Section 12 – Ecological Information
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Answer: B Explanation: Section 5 of the SDS specifically details fire-fighting procedures, extinguishing media, and special hazards. Question 4. In GHS labeling, the signal word “Danger” is used when: A) The chemical has a low level of toxicity only B) The hazard is of moderate severity C) The product presents a severe or life-threatening hazard D) The product is non-hazardous but requires handling instructions Answer: C Explanation: “Danger” is reserved for more severe hazards, whereas “Warning” is for less severe risks. Question 5. Which pictogram represents a chemical that is both toxic if inhaled and may cause skin irritation? A) Flame over a circle with a line through it B) Exclamation mark inside a diamond C) Skull and crossbones D) Gas cylinder Answer: B Explanation: The exclamation-mark pictogram denotes acute toxicity, irritants, or sensitizers. Question 6. When selecting gloves for handling a strong acid, the most appropriate material is: A) Natural rubber B) Nitrile C) Neoprene
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B) The decibel reduction achieved when properly fitted C) The lifespan of the earplug in months D) The frequency range it protects against Answer: B Explanation: NRR is a laboratory-derived value that estimates how many decibels of sound are reduced when the device is correctly worn. Question 10. For a respirator program, the “clean-shave” rule is required because: A) Facial hair improves the seal of the mask B) Shaving reduces the need for fit testing C) Facial hair can prevent a proper face seal, reducing protection D) It is a cosmetic requirement only Answer: C Explanation: Any facial hair that contacts the respirator facepiece can create gaps, compromising the seal and the respirator’s effectiveness. Question 11. Which type of respirator provides protection against unknown airborne contaminants? A) N95 filtering facepiece respirator B) Full-face air-purifying respirator with organic vapor cartridges C) SCBA (Self-Contained Breathing Apparatus) D) Powered Air-Purifying Respirator (PAPR) with HEPA filter Answer: D Explanation: A PAPR equipped with a HEPA filter can capture a broad range of particles, offering protection when the contaminant is not specifically identified.
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Question 12. The first step in the Lockout/Tagout (LOTO) process is: A) Verify that the energy source is isolated B) Apply the lock and tag C) Notify affected employees D) Prepare for shutdown and inform all personnel Answer: D Explanation: Preparation includes notifying affected workers and gathering the necessary lockout devices before any shutdown occurs. Question 13. Which of the following is NOT a recognized type of hazardous energy in LOTO procedures? A) Electrical B) Mechanical C) Thermal D) Psychological Answer: D Explanation: Psychological stress is not classified as hazardous energy; LOTO covers electrical, mechanical, hydraulic, pneumatic, thermal, chemical, and gravitational energy. Question 14. Arc flash protection is primarily achieved by: A) Wearing steel-toe boots B) Using insulated tools only C) Maintaining a safe approach distance and wearing appropriate PPE D) Applying a lockout tag on the circuit breaker Answer: C
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C) For every 4 ft of ladder length, the base should be 1 ft away from the wall D) For every 4 ft of ladder height, the base should be 1 ft away from the ground Answer: C Explanation: Positioning the ladder with a 4:1 ratio (1 ft out for every 4 ft of ladder length) ensures a safe angle (~75°). Question 18. Which type of scaffold tag indicates that the scaffold is safe for use? A) Red tag B) Yellow tag C) Green tag D) Blue tag Answer: C Explanation: A green tag signifies that the scaffold has been inspected and is cleared for occupation. Question 19. When working in a trench deeper than 4 feet, the required maximum distance between a ladder and the trench wall for egress is: A) 5 feet B) 10 feet C) 15 feet D) 20 feet Answer: B Explanation: OSHA requires a means of egress (ladder or ramp) within 25 ft of any point; the typical practice is to place a ladder no farther than 10 ft from the trench wall to meet the 25-ft rule.
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Question 20. The primary purpose of shoring in trench work is to: A) Provide a walkway for workers B) Prevent soil collapse and protect workers from cave-ins C) Drain water from the trench D) Increase the depth of the trench Answer: B Explanation: Shoring supports the trench walls, preventing cave-ins, which are the most common cause of trench fatalities. Question 21. Which of the following is considered a “physical hazard” under GHS? A) Carcinogenicity B) Acute toxicity C) Flammability D) Respiratory sensitization Answer: C Explanation: Physical hazards involve properties like flammability, explosiveness, or reactivity, whereas the others are health hazards. Question 22. In a Process Hazard Analysis (PHA), the “What-If” technique is used to: A) Identify equipment that is overdue for maintenance B) Generate possible deviation scenarios from normal operation C) Determine the exact cost of a safety improvement D) Rank employees based on safety performance Answer: B Explanation: The “What-If” method asks hypothetical questions to uncover potential failures and their consequences.
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Explanation: The hierarchy prioritizes eliminating the hazard, then substituting, then engineering controls, administrative changes, and finally PPE. Question 26. A “near miss” must be reported because: A) It is a disciplinary violation if not reported B) It provides data to prevent future incidents C) It is required for insurance claims only D) It is irrelevant if no injury occurred Answer: B Explanation: Documenting near misses helps identify hazards before they cause injury, enabling proactive corrective actions. Question 27. The “Six Steps of LOTO” do NOT include which of the following? A) Prepare for shutdown B) Isolate energy source C) Test the equipment after lockout D) Verify isolation of energy Answer: C Explanation: Testing after lockout is not part of the six steps; instead, verification (often via a try-out) ensures energy is isolated. Question 28. Which of the following is a requirement for a valid lock used in LOTO? A) It must be a combination lock B) It must be color-coded to the employee
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C) It must be a lock that cannot be easily removed without the key or combination D) It must be made of plastic Answer: C Explanation: LOTO locks must be sturdy, non-removable without the authorized individual’s key or combination to maintain safety. Question 29. When performing a Job Safety Analysis (JSA), the first step is to: A) Identify the required PPE B) List all possible hazards for each task C) Break the job into discrete steps D) Assign responsibilities for each control measure Answer: C Explanation: The JSA process begins by dividing the job into clear, manageable steps before hazards are identified. Question 30. Which of the following is considered an “affected employee” under LOTO? A) The person who applies the lock B) A supervisor who monitors the lockout C) A worker who operates the machine after lockout is removed D) A maintenance worker who is not directly involved in the lockout but works nearby Answer: D Explanation: Affected employee is anyone who works in the area where LOTO is applied but does not perform the lockout themselves.
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Explanation: “ABC” extinguishers contain dry-chemical agents effective on ordinary combustibles, flammable liquids, and energized electrical equipment. Question 34. Which of the following statements about GFCI (Ground Fault Circuit Interrupter) devices is correct? A) They protect only against short circuits B) They must be tested monthly by pressing the “test” button C) They are optional in wet locations D) They replace the need for proper lockout procedures Answer: B Explanation: Monthly testing of the GFCI ensures it will trip correctly when a ground fault occurs, providing protection from electric shock. Question 35. The most common cause of trench fatalities is: A) Falling tools B) Struck-by equipment C) Cave-ins D) Chemical exposure Answer: C Explanation: Cave-ins collapse the trench walls, crushing workers; they account for the majority of trench-related deaths. Question 36. When a worker must wear both earplugs and earmuffs, the combined noise reduction rating (NRR) is calculated by: A) Adding the two NRR values together B) Adding 5 dB to the higher NRR and then adding the lower NRR
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C) Adding 5 dB to the higher NRR, then adding the lower NRR and subtracting 7 dB D) Adding 5 dB to the higher NRR, then adding the lower NRR and subtracting 5 dB Answer: D Explanation: The OSHA formula for dual protection adds 5 dB to the higher NRR, then adds the lower NRR, and subtracts 5 dB to avoid double counting. Question 37. Which of the following is a required element of an Emergency Action Plan (EAP)? A) A list of all employees’ birthdays B) Detailed job descriptions for each worker C) Designated assembly (muster) points D) Weekly safety meeting agenda Answer: C Explanation: An EAP must specify where workers gather after evacuation to ensure everyone is accounted for. Question 38. The “Six-step” verification in LOTO includes a “try-out.” This step is performed to: A) Test the equipment’s functionality after lock removal B) Ensure the energy source has been fully isolated and cannot be re-energized C) Verify that the lock is correctly keyed to the employee D) Confirm that the lock is visible to all personnel Answer: B Explanation: The try-out (or test) confirms that the equipment remains de-energized after isolation but before work begins.
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Explanation: A shock-absorbing lanyard (often called a “shuttle”) limits the deceleration forces experienced during a fall arrest. Question 42. During a fire drill, the term “accountability” refers to: A) The time it takes to reach the assembly point B) The process of confirming that all personnel are present at the muster point C) Recording the cause of the fire D) Reporting the drill to local fire authorities Answer: B Explanation: Accountability ensures that every employee is accounted for after evacuation, confirming none are missing or trapped. Question 43. Which of the following is NOT a standard component of a Safety Data Sheet (SDS)? A) Physical and chemical properties B) Supplier’s marketing brochure C) Ecological information D) Exposure controls/personal protection Answer: B Explanation: SDSs contain regulatory safety information; marketing material is not part of the required 16 sections. Question 44. If a worker must enter a hot work area where flammable vapors are present, the most appropriate control is: A) Increase ventilation only B) Use a fire-resistant blanket C) Eliminate the source of vapors before starting hot work
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D) Provide a fire extinguisher nearby Answer: C Explanation: Removing the flammable vapor eliminates the hazard; ventilation and extinguishers are secondary controls. Question 45. When a ladder is placed on an uneven surface, the safest corrective action is to: A) Use a ladder with a longer base B) Add a leveler or ladder base plate to create a level footing C) Lean the ladder farther against the wall D) Use a higher-rated ladder Answer: B Explanation: A level footing prevents the ladder from tipping; adding a base plate or leveler corrects the uneven surface. Question 46. Which of the following best describes a “permissible exposure limit” (PEL)? A) The maximum amount of a chemical that can be stored on site B) The legal limit for exposure to a hazardous substance over a specified time period C) The recommended daily intake of vitamins for workers D) The threshold for a fire alarm activation Answer: B Explanation: PELs are OSHA-established limits on how much of a substance a worker may be exposed to during a work shift. Question 47. The purpose of a “tag” in a lockout/tagout system is to: A) Indicate the lock’s serial number
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Question 50. The “PASS” acronym for fire extinguisher operation stands for Pull, Aim, Squeeze, and: A) Stop B) Sweep C) Spray D) Shake Answer: B Explanation: After pulling the pin, aiming at the base, and squeezing the lever, you sweep the nozzle side-to-side to cover the fire. Question 51. In the context of PPE maintenance, “retirement” of a piece of equipment means: A) It is being transferred to another department B) It is cleaned and stored for future use C) It is removed from service because it can no longer provide adequate protection D) It is upgraded with new accessories Answer: C Explanation: Retirement indicates the PPE is no longer safe or functional and must be discarded or replaced. Question 52. Which of the following is the most effective way to prevent a chemical spill from becoming a fire hazard? A) Store chemicals in a refrigerated area B) Keep all chemicals away from any ignition source C) Use only plastic containers D) Apply a fire-resistant coating to the floor Answer: B
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Explanation: Removing ignition sources eliminates the possibility of a fire, regardless of storage temperature or container material. Question 53. When a worker is required to wear both safety glasses and a face shield, the primary reason is: A) To meet two separate regulatory requirements B) To provide dual protection against impact and chemical splash C) To comply with the manufacturer’s warranty D) To look more professional on site Answer: B Explanation: Safety glasses protect against impact, while a face shield adds splash protection; together they offer comprehensive eye and face safety. Question 54. Which of the following best describes “administrative controls” in safety management? A) Physical barriers that stop hazards from reaching workers B) Policies, training, and work-practice changes that reduce exposure C) Substituting a hazardous material with a less hazardous one D) Installing ventilation systems Answer: B Explanation: Administrative controls modify how work is performed (e.g., training, scheduling, signage) to reduce risk. Question 55. The “clean-shave” rule for respirator use is necessary because: A) Facial hair can cause the respirator to overheat B) Facial hair may cause the mask to slip off during use
