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12.7: Review Questions

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    Multiple Choice Questions

    1. Which of the following best defines a confined space?
    (a) A small space that workers must crawl through
    (b) Any space designed for continuous occupancy
    (c) A space large enough for a worker to enter, has limited entry to exit, and is not designed for continuous occupancy
    (d) A space that always contains hazardous materials

    2. Which of the following characteristics makes a confined space “permit-required”?
    (a) The space is outdoors
    (b) It contains or has potential to contain a hazardous atmosphere
    (c) It is only used for electrical work
    (d) It is well ventilated

    3. What should be tested first before entering a confined space?
    (a) Toxic gases
    (b) Combustible gases
    (c) Oxygen level
    (d) Temperature

    4. What is the primary duty of the attendant during a confined space entry?
    (a) Perform maintenance inside the space
    (b) Remain outside and monitor entrants
    (c) Issue permits for entry
    (d) Approve emergency procedures

    5. What is the main cause of death in confined spaces according to OSHA?
    (a) Falls
    (b) Atmospheric hazards
    (c) Electrical shock
    (d) Noise exposure

    6. Which of the following is not required in a written confined space program?
    (a) Testing atmospheric conditions
    (b) Providing protective equipment
    (c) Posting warning signs
    (d) Allowing unauthorized entry for observation

    7. What is the oxygen concentration below which an atmosphere is considered deficient?
    (a) 20.9%
    (b) 21.0%
    (c) 19.5%
    (d) 18.0%

    8. What of the following is not duty of an authorized entrant?
    (a) know space hazards
    (b) maintain communication with attendants
    (c) Perform atmospheric testing
    (d) exit when ordered to evacuate

    9. What is “engulfment” in the context of confined spaces?
    (a) Exposure to electrical energy
    (b) The surrounding and capture of a person by liquid or flowable solid
    (c) Collapse of a structure
    (d) Exposure to noise hazards

    10. What must be done if atmospheric testing reveals unsafe oxygen levels inside a confined space?
    (a) Continue work but limit time inside
    (b) Increase worker rotation
    (c) Evacuate immediately and correct the condition before re-entry
    (d) Post a warning sign but continue operations

    11. Which situation represents an “engulfment hazard”?
    (a) Exposure to extreme noise levels
    (b) A worker trapped in a pit filling with sand or liquid
    (c) Lack of communication with attendants
    (d) Poor lighting in the work area

    12. Before assigning workers to a confined space, the employer must ensure that employees:
    (a) Have at least 10 years of experience
    (b) Are trained to recognize and control confined space hazards
    (c) Have performed rescue duties previously
    (d) Are certified electricians

    True/False Questions

    13. True/False: Confined spaces can present conditions that are immediately dangerous to workers if not properly identified, evaluated, tested, and controlled.
    14. True/False: A space may also be a permit-required confined space if it has a hazardous atmosphere, the potential for engulfment or suffocation, a layout that might trap a worker through converging walls or a sloped floor, or any other serious safety or health hazard.
    15. True/False: All confined spaces are permit-required confined spaces.
    16. True/False: Only authorized entrants need training for confined space work.
    17. True/False: Oxygen concentrations above 23.5% are safe for workers.
    18. True/False: Confined spaces are designed for continuous human occupancy.
    19. True/False: Rescue service personnel must be trained in CPR and first aid.
    20. True/False: A permit-required confined space may contain hazards such as toxic gases, insufficient oxygen, or converging walls that can trap workers
    21. True/False: Posting a warning sign near a confined space eliminates the need for a written permit program.
    22. True/False: If atmospheric hazards are detected during entry, workers must exit immediately and the space must be reevaluated before re-entry.
    23. True/False: Even when a space is open at the top, it can still be classified as a confined space if it has limited entry or exit.
    24. True/False: Personal protective equipment (PPE) is optional if workers have completed confined space training.

    Answer Key: 1) c, 2) b, 3) c, 4) b, 5) b, 6) d, 7) c, 8) c, 9) b, 10) c, 11) b, 12) b, 13) True, 14) True, 15) False, 16) False, 17) False, 18) False, 19) True, 20) True, 21) False, 22) True, 23) True, 24) False.

    This page titled 12.7: Review Questions was last modified on Fri, 14 Aug 2026 17:00:23 GMT and is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Jenny Huang.