Physics
The wall of a dam is broader at the base

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

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Physics
We always see the same face of the moon, because

It revolves on its axis in adirection opposite to that ofthe earth
It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It is smaller than the earth

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