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Why the fire brigade start the work by p...

Why the fire brigade start the work by putting off the electric mains?

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VGS PUBLICATION-BRILLIANT-COMBUSTION , FUELS AND FLAME-EXERCISE
  1. What is calorific value? Write its units

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  2. How can we put off the fire if it breaks out?

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  3. Why the fire brigade start the work by putting off the electric mains?

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  4. How does water help in eliminating the factors, which support the comb...

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  5. Why do some materials burn and some do not?

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  6. Why do some materials which do nt burn at normal temperature burn at h...

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  7. If you lift the glass tumbler (which is placed over a burning candle) ...

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  8. How do you say that the gas released in the experiment is oxygen?

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  9. Can we replace potassium permanganate (KMnO4) with any other substance...

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  10. Is there any other procedure to prove that oxygen is needed for burnin...

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  11. Why do we keep phosphorus in water?

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  12. Why do kerosene stoves and bunsen burners have small holes in them?

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  13. It is hard to ignite match stick in rainy days. Why?

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  14. A wax candle burns with a yellow flame. The domestic gas burns when li...

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  15. Name the products formed when a candle burns in the air.

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  16. What do you mean by combustion?

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  17. What are combustible materials?

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  18. What are non-combustible materials?

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  19. What is ignition temperature?

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  20. What are inflammable substance? Give examples.

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