Which of the 9 hazard classes may NOT be transported in a temperature-controlled trailer?
Answer: C
Classes 1, 2.1, and 3
Explosives (class 1), flammable gases (class 2.1), and flammable liquids (class 3) are all volatile substances that need to be transported without automatic temperature control.
All choices
- AClasses 2, 3, and 5.1
- BClasses 1, 3, and 5.2
- CClasses 1, 2.1, and 3
Why the other answers are wrong
A. Classes 2, 3, and 5.1
Classes 2, 3, and 5.1 include flammable gases and liquids, but class 5.1 (oxidizers) can be transported in temperature-controlled trailers.
B. Classes 1, 3, and 5.2
Class 5.2 (organic peroxides) may be temperature controlled, so including it as prohibited is incorrect.
CDL HAZMAT Test Info
Questions on Exam
30
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The HAZMAT test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
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