Physics
The term ''equinox' means

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 axis of the Earth around which it rotates
The path which the Earthtakes around the Sun
When the day and night are of equal duration

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water
The sea is-deeper than the river

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