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Why it is better to wear cotton clothes ...

Why it is better to wear cotton clothes in summer ?

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Statement-1: It is better to wash the clothes in cold soap solution. Statement-2: The surface tension of cold solution is more than the surface tension of hot solution:

It is better to wash clothes in hot water than in cold water .Explain .

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Why do we wear white or light colour clothes in summer and dark colour clothes in winter ?

Assertion : It is better to wash clothes by soap with cold liquid. Reason : The hot liquid of soap have less surface tension than cold one .

Why use of bio-fuel/biomass is better as compared to fossil fuel ?

You may have seen the trick where a tablecloth is jerked from a table, leaving the dishes that were on the cloth nearly in their original positions. What do you need to perform this successfully? Which cloth should we use? Is it cloth made of thick cotton or thin silk? Should the dishes possess large mass or small mass? Is it better to pull the cloth with a large force or pull it with a gentle and steady force?

Why is reuse better than recycling of materials ?