Physics
A falling drop of rain water acquires the spherical shape due to

Surface Tension
Viscosity
Atmospheric pressure
Gravitational force

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

It rotates at the same speed as the earth around the sun
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

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