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

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The path which the Earthtakes around the Sun
When the day and night are of equal duration

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