Physics
We feel cool when we sit near the fan, this is because

We feel cool when air touches the body.
Fan cools surrounding air.
Fan gives cool air.
Air vapourises the sweat on our body.

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Physics
The wall of a dam is broader at the base

Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth

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Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.

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