Question

a) What is the principle of solar cooker? 1
3) What is the use of black painted surface in a
solar cooker?
3) Solar cooker is covered with a glass lid. Give Glass st
reason
(a) Why there is a need of non-conventional sources
of energy?
​

Answer 1

Answer:

a)principle of solar cooker is greenhouse effect

b) black painted surface utilises sunlight to cook food.

c) as mentioned that the principle of solar cooker is greenhouse effect the glass lid is covered on solar cooker due to it maintained inside temperature

d) when non conventional source of energy because in future conventional sources of energy like coal and petroleum will be exhausted.

Answer 2

Answer:

a) solar cooker works on the principle of greenhouse effect

b) black is a heat absorbing colour thus it helps in heating

c) it is covered with glass lid as it helps in trapping heat which is the principle of greenhouse effect

d) conventional sources r exhausting at high rate therefore there is need for conventional sources.