Question

3) Water is used to extinguish fire because it
(a) reduces the ignition temperature of the burning substance.
(b) cools the burning substance below its ignition temperature
(s) makes a blanket of water vapour and cuts off the oxygen.
(d) both (b) and (c).
4. In carbon dioxide based fire extinguishers, carbon dioxide is present in
(a) liquefied and compressed form.
(b) powdered sodium bicarbonate form.
(c) powdered potassium bicarbonate form. (d) all of them.
5. When a wax candle burns, which part of it catches fire?
(b) Wax vapour
(c) Liquid wax
(d) Solid wax
(2) Wick​

Answer 1

Answer:

Answer: Water cools the combustible material and the temperature is brought below the ignition temperature of the combustible material . This prevents fire from spreading. Water vapours also surround the combustible material and help in cutting off the air supply.

Answer 2

Answer:

3. I think it's both b and c.

4. All of them.

5. Wick.

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