Physics
A fresh egg when placed in salt water will

Sink but will not go to the bottom
Burst
Sink and go to the bottom
Float

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

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

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