Physics
A drop of liquid assumes spherical shape because:

Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume
A sphere has the least surface area for a given volume
Inter molecular forces are weak in liquids

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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 is smaller than the 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

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