1.

Mention three advantages and three disadvantage of producing hydroelectricity by building dams on rivers. (b) given reason for the following (i) A solar cooker box is covered with a glass plate (ii) Asolar cooker box is painted black from inside

Answer»

Solution :(B) (i) Glass plate increases the inside temperature of the solar COOKER DUE to the GREEN house effect of infrared rays of sun
(ii) Black colour absorbs the HEAT energy quickly.


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