Q15 of 25 Page 106

Can you heat water in a paper vessel? How is it possible?

Yes, we can heat water in a paper vessel. This can be explained as follows:

When the paper vessel is heated, the heat gets transferred from paper to the water and water starts becoming hot. This transfer of heat from paper to water prevents the paper from reaching its ignition temperature. Ignition temperature is the lowest temperature at which a material catches fire. Thus paper doesn’t catch fire. In this way water can be heated in a paper vessel.


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13

Use of more fuels in our daily life causes air pollution and it is harmful to human being and the other life on earth. Suggest some remedies to avoid this.

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Let us assume that you are on the moon. If you try to focus sunlight on a paper using magnifying glass, does the paper catch fire? or not? Why?

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“Is combustion possible without the supply of oxygen?'' Discuss with your teacher

 17

Explain giving reasons: In which of the following situations water will get heated in a shorter time?

a) Srikar kept water beaker near the wick in the yellow part of a candle flame.


b) Sonu kept water beaker in the outer most part of the flame.