# HAZWOPER 40 Hour Practice Test Free practice quiz · 15 questions Answer every question, then press **Check my answers** to see your score and an explanation for each one. Study first with the guide: [What Is HAZWOPER? The Complete Guide to OSHA 29 CFR 1910.120](https://www.hazwoperosha.com/guides/what-is-hazwoper/). **1. What does HAZWOPER stand for?** - Hazardous Waste Operations and Emergency Response - Hazardous Work Operations and Personnel Response - Hazardous Waste and Pollution Emergency Regulations - Hazard Operations and Worker Protection Emergency Rules **Answer: Hazardous Waste Operations and Emergency Response.** HAZWOPER is Hazardous Waste Operations and Emergency Response, OSHA 29 CFR 1910.120. **2. How much supervised field experience does a 40-hour general site worker need?** - None - 1 day - 3 days - 5 days **Answer: 3 days.** 1910.120(e)(3)(i) requires 40 hours of off-site instruction plus at least 3 days of actual field experience under a trained, experienced supervisor. **3. How often is HAZWOPER refresher training required?** - Every 3 years - Every 2 years - Every year - Only when changing jobs **Answer: Every year.** 1910.120(e)(8) requires 8 hours of refresher training annually. **4. Which PPE level gives the highest level of skin, eye and respiratory protection?** - Level A - Level B - Level C - Level D **Answer: Level A.** Level A combines SCBA or supplied air with a totally encapsulating, vapor-tight suit. **5. Below what oxygen concentration is an atmosphere considered oxygen deficient?** - 23.5% - 20.9% - 19.5% - 16% **Answer: 19.5%.** OSHA defines oxygen deficient as less than 19.5% oxygen by volume. Normal air is about 20.9%. **6. In which work zone does decontamination take place?** - Exclusion zone - Contamination reduction zone - Support zone - Staging zone **Answer: Contamination reduction zone.** The decon line sits in the contamination reduction zone (warm zone), between the exclusion and support zones. **7. Where should the support zone be located?** - Downwind of the exclusion zone - Inside the exclusion zone - Upwind of the exclusion zone - At the lowest point on the site **Answer: Upwind of the exclusion zone.** The support zone is clean and placed upwind so vapors and dust drift away from it. **8. Which PPE level uses an air-purifying respirator?** - Level A - Level B - Level C - Level D **Answer: Level C.** Level C uses an air-purifying respirator, allowed only when contaminants are known and APR criteria are met. **9. What is the buddy system?** - Two workers share one respirator - Workers are organized so each is observed by at least one other worker - A supervisor checks every worker once per shift - Workers rotate between zones every hour **Answer: Workers are organized so each is observed by at least one other worker.** Under 1910.120(a)(3), the buddy system organizes employees so each one is observed by at least one other in the group. **10. How many additional hours of training do on-site supervisors need beyond worker training?** - 4 hours - 8 hours - 16 hours - 24 hours **Answer: 8 hours.** 1910.120(e)(4) requires at least 8 additional hours of specialized training for managers and supervisors. **11. Which of these must be in the site-specific safety and health plan?** - Employee salary information - Decontamination procedures - The company's marketing plan - Vehicle maintenance logs **Answer: Decontamination procedures.** Decontamination procedures are one of the required HASP elements in 1910.120(b)(4)(ii). **12. A combustible gas reading above what percentage of the LEL commonly means workers should withdraw?** - 1% - 5% - 25% - 100% **Answer: 25%.** Common EPA guidance treats readings above 25% LEL as an explosion hazard requiring withdrawal. Your site plan sets the exact action levels. **13. Medical surveillance is required for employees who wear a respirator for how many days or more per year?** - 5 - 10 - 30 - 90 **Answer: 30.** 1910.120(f)(2) covers employees who wear respirators 30 days or more a year, among other groups. **14. What is the most common route of exposure at hazardous waste sites?** - Ingestion - Injection - Inhalation - Hearing **Answer: Inhalation.** Inhalation of gases, vapors, mists and dusts is the most common route of exposure. **15. What does IDLH stand for?** - Initial Daily Limit of Hazard - Immediately Dangerous to Life or Health - Industrial Dose Level for Humans - Inhalation Dose Limit, Hourly **Answer: Immediately Dangerous to Life or Health.** IDLH is Immediately Dangerous to Life or Health. Only atmosphere-supplying respirators are used at or above IDLH. ## More free HAZWOPER quizzes - [HAZWOPER 8 Hour Refresher Practice Quiz](https://www.hazwoperosha.com/quizzes/hazwoper-8-hour-refresher-practice-quiz/) · Free quiz · 10 questions - Free HAZWOPER 8 hour refresher practice quiz with answers. 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