Question 820 Deck Safety

70% to pass

Which statement is TRUE concerning carbon dioxide?

A It is lighter than air.
B It is used mostly on class A fires.
C It is an inert gas.
D All of the above
AI Explanation

The correct answer is C) It is an inert gas. Carbon dioxide (CO2) is an inert gas, meaning it does not actively participate in chemical reactions. This property makes it an effective fire extinguishing agent, as it displaces oxygen and smothers the fire without reacting with the burning materials. Carbon dioxide is primarily used on Class B (flammable liquids) and Class C (energized electrical equipment) fires, as it does not conduct electricity and does not leave a residue. The other options are incorrect: A) Carbon dioxide is heavier than air, not lighter, and B) while it is used on Class B fires, it is not mostly used on Class A (ordinary combustible) fires.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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