Physics
Wollen clothes keep the body warm because

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

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.

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