OSHA HAZWOPER 40-Hour (29 CFR 1910.120) course final exam
PPE and respiratory protection: practice questions
Our HAZWOPER 40-Hour bank has 39 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
Grade D breathing air must contain oxygen between:
- 10 and 15 percent
- 19.5 and 23.5 percent
- 16 and 19.5 percent
- 21 and 30 percent
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B. 19.5 and 23.5 percent — 1910.134(i)(1)(ii)(A) requires oxygen content of 19.5–23.5%.
Question 2
PPE selection must be based on:
- The cheapest equipment available from suppliers
- The hazards found in site characterization
- Whatever was used on the last job
- The colour preferred by workers
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B. The hazards found in site characterization — 1910.120(g)(3)(i) requires PPE that protects against hazards identified during site characterization and analysis.
Question 3
Level A should be used in confined, poorly ventilated areas when:
- The area is fully characterized as safe
- The area is well lit and easy to reach on foot
- Only dust is present in the space
- Conditions requiring Level A haven't been ruled out
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D. Conditions requiring Level A haven't been ruled out — Appendix B Part B lists confined, poorly ventilated areas where the absence of Level A conditions is not yet determined.
Question 4
According to Appendix B, PPE breakthrough time should:
- Be ignored
- Be shorter than the work duration
- Equal exactly 1 hour
- Exceed the work duration
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D. Exceed the work duration — Appendix B says where continuous protection isn't possible, breakthrough time should exceed work durations.