Q18. Why do mud houses with that ched roofs keep cool in summers and warm in winter? Is it right to
employ children for production of silk?
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Explanation:
B [ Thatched roofs trap air]
Notes:
Houses with thatched roofs keep cool in summer, as compared to houses with concrete roofs. It is because thatched toof contains a large amount of trapped air which is bad conductor of heat. Hence heat from outside does not flow in thatched roof house. Thus they remain cool in summer.
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