Physics
Solar eclipse will take place when

the earth is between the moon and the sun
the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth

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

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

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