Physics
Woollen cloth protects the body from cold because

External heat rays enter into the body through the woollen cloth
It is a poor conductor of heat
It reflects heat
It is a good conductor of heat

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Physics
Hydro-electric power is a:

non-renewable natural resource
A mixture of renewable and non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised

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