Knowledge Exam Practice Questions

CDL Hazardous Materials (H) Written Knowledge Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the primary responsibility of a hazardous

materials driver?

• To deliver the load on time
• To ensure the safe transportation of hazardous materials
• To maintain low fuel consumption
• To follow the shortest route

Rationale: The driver’s main responsibility is safety when transporting

hazardous materials, including following regulations and preventing accidents.

• What should you do if a hazardous materials placard becomes

unreadable during transport? 1 / 4

• Ignore it if the load is secure
• Replace or cover it so the correct placard is displayed
• Remove the placard and continue
• Report it only after delivery

Rationale: Placards must always be visible and accurate to warn others of

the hazard.

• How often must you inspect a placarded vehicle carrying hazardous

materials?

• Daily
• Weekly
• Before each trip
• Monthly

Rationale: Regulations require that drivers inspect placarded vehicles

before every trip to ensure safety compliance.

• When is it permissible to transport hazardous materials without

proper placards?

• During emergency situations
• When the route is short
• Never, unless specifically excepted by regulations
• When the driver is experienced

Rationale: Placards are legally required except for specific exemptions

listed in regulations. 2 / 4

• Which of the following is required in the cab of a vehicle carrying

hazardous materials?

• Fire extinguisher only
• Shipping papers and emergency response information
• Extra fuel
• Only the driver’s license

Rationale: Shipping papers must be accessible to law enforcement and

emergency personnel, and emergency response information is required for safety.

• What is the purpose of a hazardous materials shipping paper?
• To track delivery times
• To provide information about the materials being transported
• To calculate tolls
• To verify fuel consumption

Rationale: Shipping papers communicate the identity, quantity, and

hazards of the materials for safe handling.

• How should hazardous materials be loaded in a vehicle?
• Randomly, to fit more cargo
• So that incompatible materials are separated and the load is

stable

• By weight only
• Only in the front of the vehicle 3 / 4

Rationale: Proper loading prevents chemical reactions and ensures the

vehicle’s stability.

• Which placard would be used for a vehicle carrying gasoline?
• Poison
• Explosives
• Flammable
• Oxidizer

Rationale: Gasoline is flammable and requires a flammable placard.

• You are transporting hazardous materials and get into a minor

accident. What should you do first?

• Call the company dispatcher
• Protect the area and warn others of the hazard
• Attempt to clean up immediately
• Continue driving if the spill is small

Rationale: Safety comes first: warn others, prevent further exposure, and avoid spreading the hazard.

• What does the “inhalation hazard” symbol indicate?
• Material is flammable
• Material can explode
• Material is dangerous if inhaled
• Material is corrosive
• / 4