Exam Practice Questions And Correct

Hazardous Materials Operator Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of the Hazard Communication Standard

(HCS)?

• To ensure only employers understand chemical hazards
• To eliminate all hazardous chemicals from the workplace
• To ensure workers know the hazards and identities of chemicals they

work with

• To control environmental releases of hazardous substances

Answer: C

Rationale: The HCS (Right-to-Know) ensures employees have access to

hazard information about workplace chemicals.

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• Which agency regulates hazardous materials transport in the United

States?

A. OSHA

B. DOT

C. EPA

D. FEMA

Answer: B

Rationale: The U.S. Department of Transportation governs hazmat

transportation requirements including labeling, placards, and packaging.

• What does the NFPA 704 diamond represent?
• Waste disposal requirements
• Respiratory hazards only
• Health, flammability, instability, and special hazards
• PPE requirements

Answer: C

Rationale: The NFPA 704 system communicates emergency hazard

information across four categories.

4. A Safety Data Sheet (SDS) must include:

• Company payroll information
• Customer service contacts 2 / 4

• Training certificates
• Hazard identification and handling instructions

Answer: D

Rationale: SDSs contain chemical hazard and management information

required for safe use.

• Which class of hazardous materials includes flammable liquids?
• Class 1
• Class 2
• Class 3
• Class 5

Answer: C

Rationale: DOT Class 3 includes flammable and combustible liquids.

6. OSHA requires emergency exit routes to be:

• Blocking hazards temporarily allowed
• Unobstructed and clearly marked
• Shared with material storage
• Locked during operations

Answer: B

Rationale: Egress paths must remain clear and marked for quick

evacuation. 3 / 4

7. The phrase “PEL” refers to:

• Personal Exposure Liability
• Permissible Exposure Limit
• Personnel Emergency Level
• Partial Evaporation Level

Answer: B

Rationale: PEL is an OSHA-regulated exposure limit for airborne

contaminants.

8. A corrosive material primarily damages:

• Flammable surfaces
• Packaging materials only
• Living tissues and metals
• Electronic circuits

Answer: C

Rationale: Corrosives destroy skin, eyes, and metals via chemical reaction.

• Which type of respirator supplies clean air from outside the

contaminated area?

A. APR

• SAR
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