TheoryUS Firefighter Practice Test Video
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Q1Which of the following is classified as a gaseous fuel?
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✓ Correct answer: Propane
Propane is a gaseous fuel. Gasoline is a liquid fuel, while wood and coal are solid fuels; each state behaves differently in a fire.
Q2A multipurpose ABC dry-chemical extinguisher can be used on which fires?
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✓ Correct answer: Ordinary combustibles, flammable liquids, and energized electrical equipment
An ABC-rated dry-chemical extinguisher works on Class A, B, and C fires, making it a versatile general-purpose unit. It is not rated for Class D or K fires.
Q3The three primary methods of heat transfer relevant to fire spread are:
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✓ Correct answer: Conduction, convection, and radiation
Conduction, convection, and radiation are the three modes of heat transfer that move energy and spread fire. Understanding them is fundamental to predicting fire behavior.
Q4Before relying on a portable fire extinguisher, you should check that the pressure gauge needle is in the:
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✓ Correct answer: Green operable zone
A charged, ready extinguisher shows its gauge needle in the green operable range. A needle in the red indicates it is over- or under-pressurized and may not work.
Q5At standard pressure, water freezes at:
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✓ Correct answer: 32 F / 0 C
Water freezes at 32 F, equal to 0 C, at standard atmospheric pressure. Freezing can disable water-based fire systems and hose lines in cold weather.
Q6In the fire triangle, oxygen acts as the:
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✓ Correct answer: Oxidizing agent that supports combustion
Oxygen is the oxidizer that combines with fuel during combustion. It supports the reaction but is not itself the fuel or the heat source.
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