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Hazardous Materials (Hazmat) Practice Question 3

H or XHazardous Materials (Hazmat) · Question 3

A 'placard' on a hazmat vehicle is:

• AA 10-inch square diamond marker placed on each side and end of the transport unit
• BAn interior label
• CDriver clothing
• DA health certificate

Correct answer: A. A 10-inch square diamond marker placed on each side and end of the transport unit

Why: Placards are 10.75-inch square diamonds turned 45 degrees, attached on all four sides of the transport unit. They communicate the primary hazard to first responders.

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

• Q39. When checking placards before driving, you should verify:
• Q52. Labeling refers to:
• Q1. The Hazardous Materials Regulations are found in:
• Q15. Class 1 hazardous materials are:
• Q28. The CHEMTREC emergency phone number is:

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.