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Hazardous Materials (Hazmat) Practice Question 25

H or XHazardous Materials (Hazmat) · Question 25

Smoking is prohibited within how many feet of a placarded vehicle (with certain exceptions)?

• A10 feet
• B25 feet
• C50 feet
• D100 feet

Correct answer: B. 25 feet

Why: Smoking and any open flame is prohibited within 25 feet of a vehicle carrying explosives, oxidizers, flammable materials, or empty placarded tanks.

How this question fits the Hazmat test

Mishandled hazmat causes catastrophic public consequences. The endorsement is restricted, requires fingerprint background screening through the TSA, and demands deeper familiarity with regulatory paperwork than any other CDL endorsement.

Study technique for this topic

Master the Hazardous Materials Table columns, know the placarding thresholds, and learn which classes can never be loaded together. Practice locating UN/NA identification numbers and understanding the segregation chart.

Related Hazmat practice questions

• Q28. The CHEMTREC emergency phone number is:
• Q41. Under what condition can a driver leave a hazmat vehicle unattended?
• Q54. A 'cylinder' of compressed gas requires:
• Q3. A 'placard' on a hazmat vehicle is:
• Q16. Class 2 hazardous materials are:

Continue your CDL preparation

The Hazardous Materials (Hazmat) portion of the CDL knowledge exam covers more than this single question. Use this site's full Hazardous Materials (Hazmat) bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.