(a) We often use electricity and fuels like coal and wood to keep our houses cool or warm. Is it possible to construct buildings that are not affected much by heat and cold outside? Give any two examples of such materials that could be used to construct such houses.
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Answer:Yes it is possible to construct houses that are not affected much by heat and cold outside. This can be done by constructing outer walls of buildings so that they have trapped layers of air. One way of doing this is to use hollow bricks, which are very commonly available these days.
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