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Abida and Ramesh were doing an experimen...

Abida and Ramesh were doing an experiment in which water to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame.whose water will get heated in a shorter time?

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One day in the morning, Ramesh filled up 1/3 bucket of hot water from geyser, to take bath. Remaining 2.3 was to be filled by cold water (at room temperature) to bring mixture to a comfortable temperature. Suddenly Ramesh had to attend to something which would take some time say 5 - 10 minutes before he could take bath. Now the he had two options: (i) fill the remaining bucket completely by cold water and then attend to the work, (ii) first attend to the work and fill the remaining bucket just before taking bath. Which option do you think would have kept water warmer ? Explain.

PSEB-COMBUSTION AND FLAMES-EXERCISE
  1. List conditions under which combustion can take place.

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  2. Fill in the blanks. Burning of wood and coal causes…………….. Of air.

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  3. Fill in the blanks. A liquid fuel ,used in homes is………………

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  4. Fill in the blanks . Fuel must be heated to its ………………..before it sta...

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  5. Fire produced by oil cannot be controlled by……………………….

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  6. Explain how the use CNG in automobiles has reduced pollution in our ci...

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  7. Compare LPG and wood as fuels.

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  8. Give reason : Water is not used to control fire involving electrical ...

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  9. Give reason: LPG is better domestic fuel than wood .

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  10. Give reason : Paper by itself catches fire easily whereas a piece of...

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  11. Make labelled diagram of candle flame.

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

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  13. Explain how CO2 is able to contrl fires.

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  14. It is difficult to burn a heap of green leaves but dry leaves catch fi...

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  15. Which zone of a flame does a goldsmith use for melting gold and silver...

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  16. In an experiment 4.5 kg of a fuel was completely burnt. The heat produ...

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  17. Can the process of rusting be called combustion ? Discuss.

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  18. Abida and Ramesh were doing an experiment in which water to be heated...

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