Home Builders Institute Pre-Apprenticeship Certificate Training (HBI-PACT) Practice Test

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Which of the following contains materials that are combustible and associated with Class A fires?

Oils
Copper
Cardboard
Electrical wiring

The correct answer is: Cardboard

Class A fires are typically fueled by ordinary combustibles, which include materials such as wood, paper, cloth, rubber, and some types of plastics. Cardboard, being a paper product, falls under this category and is readily combustible. When exposed to an ignition source, cardboard can easily catch fire and sustain a flame, contributing to the intensity and spread of a Class A fire. In contrast, the other materials listed either do not combust in the same way or do not contribute to Class A fire scenarios. Oils can ignite and are associated with Class B fires, which are fueled by flammable liquids. Copper, as a metal, does not burn and is not a combustible material, while electrical wiring, though it can lead to fire hazards due to short circuits or overloads, does not itself serve as fuel for combustion. Therefore, cardboard is the only option primarily associated with materials that contribute to Class A fires.