Physics
Wollen clothes keep the body warm because

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

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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