Physics
A drop of liquid assumes spherical shape because:

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

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Physics
Stars twinkle because

the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.
None of these
the distance of the stars from the earth changes with time.

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