Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train

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

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