Q15 of 269 Page 140

Which of the two causes serious air pollution and how?

Among them, thermal power plant causes serious air pollution because it emits harmful gases like nitrogen oxide, sulphur dioxide and fly-ash into the air.


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Fill in the following blanks with suitable words :

A solar cell converts …………………. energy into …………………. energy.

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What is the difference between a thermal power plant and hydro power plant?

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Compare the sun and the fossil fuels as the sources of energy.

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What kind of mirror, concave, convex or plane, would be best suitable for use in a solar cooker? why?