Question 26 of 30
What is NOT a characteristic of a carbon dioxide fire extinguishing agent?
A
It leaves no messy residue after use
B
It is effective even if ventilation is not shut down
C
It displaces air to smother a fire
D
It can cause frostbite upon contact with skin
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Answer & Explanation
The correct answer is Option B: It is effective even if ventilation is not shut down.
Carbon dioxide (CO2) extinguishers displace oxygen to smother a fire, and as they discharge, the rapid expansion of gas causes extreme cooling, potentially leading to frostbite. However, CO2 is electrically conductive and must not be used on live electrical equipment if safer alternatives exist, and ventilation is crucial after use to clear the oxygen-deficient atmosphere.