Community QuestionSeen on 8 CBTs

Around which hazard classes must you never smoke?

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Answer

Class 1 (Explosives) Class 2.1 (Flammable Gas) Class 3 (Flammable Liquids) Class 4 (Flammable Solids) Class 5 (Oxidizers)

7 of 8 indexed CBT versions give this answer·Answer index rebuilt Aug 16, 2026

The indexed versions don't agree on this one

This question appears on 8 CBT versions we've indexed, and they don't all give the same answer. Exam editions change and answer keys get re-cut, so more than one of these was correct on the test it came from. Here is each of them, and how many versions give it.

7 of 8 versionsmost versions

Class 1 (Explosives) Class 2.1 (Flammable Gas) Class 3 (Flammable Liquids) Class 4 (Flammable Solids) Class 5 (Oxidizers)

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1 of 8 version

Class 1 explosives, class 4 flammable solids, class 5 oxidizers, class 3 flammable liquids

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