TheoryUS Firefighter Practice Questions
Free US Firefighter practice questions with answers and plain-English explanations. Browse the PDF, video and online mock test.
US Firefighter Questions
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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.
Q7Which statement about convection is correct?
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✓ Correct answer: It transfers heat by the circulation of heated gases or liquids
Convection moves heat through the circulation of heated fluids (gases or liquids). It does not require direct solid contact and cannot occur in a vacuum.
Q8Which product of combustion most directly reduces a firefighter's visibility inside a structure?
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✓ Correct answer: Smoke
Smoke, composed of suspended particles, obscures vision and is the product of combustion most responsible for reduced visibility during interior operations.
Q9To stop a fire using the fire triangle concept, a firefighter must remove at least:
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✓ Correct answer: One of the three sides (heat, fuel, or oxygen)
Removing any single side of the fire triangle, heat, fuel, or oxygen, breaks the reaction and extinguishes the fire.
Q10Which of the following is a competent ignition source for a fire?
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✓ Correct answer: An electrical spark
An electrical spark provides the heat energy needed to ignite a fuel-air mixture. Cold water, damp sand, and inert nitrogen do not supply ignition energy.
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