Question

1. List condition under which combustion can take place. ( presence of oxygen, presence of fuel and heat to raise the temperature of fuel beyond its ignition temperature)

2. Can the process of rusting be called combustion.

3. Write down an activity to prove that air is essential for burning.

4. What is ignition temperature.

5. What are inflammable substance.

6. Paper by itself catches fire easily whereas a piece of paper wrapped around aluminium pipe does not. Explain.

7. Is it difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

8. Petrol does not catch fire on its own at room temperature. Why?

9. Why should match-sticks is rubbed on a rough surface on ignite it?

10. Water is used to control fires involving electrical equipment. Why?

11. Explain how carbon dioxide is able to control fires.

12. What can be done to put off fire? ( hint. At least one condition for burning should be removed)

13. Describe the working of soda - acid fire extinguisher. ( hint: based on the principle of cooling the temperature of burning substance and cutting the supply of oxygen, contains sulphuric acid and sodium bicarbonate which reacts to produce carbon dioxide and water, carbon dioxide covers fire and cuts off the supply of oxygen and water lowers the temperature)

14. Draw a well labelled figure of cylinder of fire extinguisher. ​

Answer 1

Answer:

hfgdhgfdhcghcrdhgfcxfgdfghshdxfcjgfcfhxghcgfxdffgdcgcffhggh bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Explanation:

trdrhnbgsredsxtgssssssssssssssssssssssssssssssssssssssgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg