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By which of the following can petrol fire be extinguished ?
1. Sand 
2. Water
3. Carbon dioxide 
4. Saw dust

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Correct Answer - Option 3 : Carbon dioxide 

The Correct Answer is Carbon dioxide.


  • CO2 fire extinguishers contain pure carbon dioxide, which is a residue-free extinguisher.
  • Recommended for use on live electrical equipment and suitable for Class B flammable liquid fires (petrol, tar, solvents).
  • In 1924, the Walter Kidde Company invented the carbon dioxide (CO2) extinguisher in response to Bell Telephone's request for an electrically non-conductive chemical for extinguishing previously difficult-to-extinguish fires in telephone switchboards.
  • Carbon dioxide works to put out fires by displacing oxygen. It was once thought that it worked by cooling the fire, but this effect is insignificant in most cases.

  • Sand extinguishers are used to put out flammable metal fires (class D fires) by actually smothering them.
  • Water fire extinguishers penetrate burning materials, providing a cooling effect and preventing reignition. They are ideal for use on class A solid combustible fires (wood, paper, fabrics, coal).

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