Physics
Wollen clothes keep the body warm because

Wool increases the temperature of the body
Wool rejects heat from the outer objects
Wool is a bad conductor
Wool absorbs radiant heat from outer objects

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Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water
Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod

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