You may use a flame to check for hazmat leaks:
Correct. Never use a flame to check anything near hazmat. Use a flashlight or other intrinsically safe light.
CDL Practice Question #244
Category: Hazmat
Why this question matters
This question is one of 68 in our Hazmat bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.