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Question

After Kenneth's reply, John could remember that he had seen in movies that people cover themselves in blankets during fires. He asked Kenneth 'how would you explain this activity?' Is it true that blankets save us from fires? Can you give us a reason.

Kenneth: Yes blankets save us from fires. But I don't know the exact reason. Maybe Sam can help us.

John: Yes Sam you must be knowing this.

Sam: Yes, I know........................

Which of the following can be Sam's answer?


A
Blankets cut off the supply of carbon dioxide to fire and hence stop fire from spreading.
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B
Blankets cut off the supply of nitrogen to fire and hence stop fire from spreading.
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C
Blankets cut off the supply of oxygen to fire and hence stop fire from spreading.
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D
Blankets cut off the supply of water vapours to fire and hence stop fire from spreading.
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Solution

The correct option is C Blankets cut off the supply of oxygen to fire and hence stop fire from spreading.

We know that, for anything to burn oxygen is required. Oxygen supports burning and is a necessary requirement for anything to burn under normal conditions. Now if we can cut-off the oxygen supply to the fire by any means, we would be able to restrict the fire from spreading. A blanket helps in cutting-off the oxygen supply to the and thus stops fire from spreading further and so the statement "Blankets cut off the supply of oxygen to fire and hence stop fire from spreading” is correct.


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