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Doctors Medicines MCQs Q&A

  1. A and B
  2. A and C
  3. B and D
  4. B and C
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1 Answers

Option 2 : A and C

Concept :

Extinguishing fire :

  • When there is any fire breakout water is poured on the fire.
  • Water cools the combustible material so that its temperature is brought below its ignition temperature.
  • This prevents the fire from spreading.
  • Water vapours also surround the combustible material, helping in cutting off the supply of air
  • Hence the fire is extinguished.

Explanation :

  • The most common fire extinguisher is water.
  • But water works only when things like wood and paper are on fire.
  • If electrical equipment is on fire, water may conduct electricity and harm those trying to douse the fire.
  • Water is also not suitable for fires involving oil and petrol.
  • As water, sinks below the oil, it keeps burning on the top.
  • For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO2 ) is the best extinguisher.

the correct answer is electrical fire and the burning of petrol.

  • CO2, being heavier than oxygen, covers the fire like a blanket.
  • Since the contact between the fuel and oxygen is cut off, the fire is controlled. 

 

  • There are three essential requirements for producing fire.
  • These are fuel, air (to supply oxygen), and heat (to raise the temperature of the fuel beyond the ignition temperature).
  • The fire extinguisher is to cut off the supply of air and bring down the temperature of the fuel. 
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Related Questions

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