FIND BOOK SOLUTIONS

IMPORTANT QUESTIONS

1. Which zone of a flame does a goldsmith use for melting gold and silver and why?

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2. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

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3. Explain how Carbon dioxide is able to control fires.

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4. Name the unit in which the calorific value of a fuel is expressed.

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5. Make a labelled diagram of a candle flame.

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6. Give reasons. (a) Water is not used to control fires involving electrical equipment. (b) LPG is a better domestic fuel than wood. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

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7. Compare LPG and wood as fuels.

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8. Explain how the use of CNG in automobiles has reduced pollution in our cities.

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9. Fill in the blanks. (d) Fire produced by oil cannot be controlled by <u>_________</u> .

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10. Fill in the blanks. (c) Fuel must be heated to its <u>_________</u> before it starts burning.

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