Multiple choice general knowledge

Petrol fire can be extinguished by:

  1. water

  2. Carbon dioxide

  3. sand

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide (CO2) extinguishes petrol fires by displacing oxygen and smothering the flames. CO2 is heavier than air and forms a blanket over the fuel. Water is ineffective and dangerous for petrol fires because petrol floats on water and can spread the fire. Sand can work by smothering but is less practical and reliable than CO2 extinguishers.

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