Safety & Emergency Hazardous Materials (HazMat) 2 — Questions and Answers
Question 1: What level of PPE provides the highest degree of skin, eye, and respiratory protection?
- Level A (Correct answer)
- Level B
- Level C
- Level D
Correct answer: Level A
Level A PPE includes a fully encapsulating chemical-resistant suit and SCBA, providing the maximum skin and respiratory protection.
Question 2: What does the GHS signal word 'Danger' indicate compared to 'Warning'?
- More severe hazard category (Correct answer)
- Less severe hazard category
- Chronic health hazard only
- Environmental hazard
Correct answer: More severe hazard category
Under GHS, 'Danger' indicates the more severe hazard categories (1–2) while 'Warning' is used for less severe categories (3–5).
Question 3: What is the purpose of a Safety Data Sheet (SDS) Section 4?
- First aid measures (Correct answer)
- Composition/ingredient information
- Handling and storage
- Exposure controls
Correct answer: First aid measures
Section 4 of the GHS-standardized SDS covers first aid measures, including symptoms and required treatment for exposure routes.
Question 4: What does TLV-TWA stand for in industrial hygiene?
- Threshold Limit Value – Time-Weighted Average (Correct answer)
- Toxic Level Value – Time-Weighted Assessment
- Threshold Lethal Value – Total Work Area
- Time Limit Value – Toxic Work Average
Correct answer: Threshold Limit Value – Time-Weighted Average
TLV-TWA (Threshold Limit Value – Time-Weighted Average) is the ACGIH-recommended average airborne concentration for an 8-hour workday that most workers can be exposed to without adverse effects.
Question 5: Which UN hazard class covers explosive substances?
- Class 1 (Correct answer)
- Class 2
- Class 3
- Class 5
Correct answer: Class 1
UN Dangerous Goods Class 1 covers explosives, subdivided by type of explosive hazard (mass explosion, projection hazard, etc.).
Question 6: What color is the DOT placard for oxidizers?
- Yellow (Correct answer)
- Orange
- White
- Green
Correct answer: Yellow
DOT Class 5.1 oxidizer placards are yellow with black text and the word OXIDIZER, warning of substances that can accelerate combustion.
Safety & Emergency Hazardous Materials (HazMat) 2
What level of PPE provides the highest degree of skin, eye, and respiratory protection?