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Water in a dish evaporates faster than in a bottle. Give reason.
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Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
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Why is cooling produced on evaporation of a liquid?
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Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
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Give two applications of evaporation.
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Explain why in hot summer days water remains cool in earthen pots.
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A patient suffering from high fever is advised to put wet clot strips on his forehead. Why?
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The S.I. unit of power is ..........
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Match the following
| column A | Column B |
| A stone at a height | power |
| A Moving ball | joule |
| Energy | work done in 1 s |
| Power | potential energy |
| Watt | kinetic energy |
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Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is
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Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
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A ray of light travels from a denser medium to a rarer medium. How will it bend?
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A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
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What do you mean by the term dispersion?
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State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
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