Physics
The correct statement is:
- Iron rims are cooled before they are placed on the cart wheels.
- A glass stopper gets tightened on warming the neck of the bottle.
- Telephone wires sag in winter, but become tight in summer.
- A little space is left between two rails on a railway track.
Heat Energy
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Answer
A little space is left between two rails on a railway track
Reason — During summer season due to rise in temperature the rails expands, so little space is left between two rails on a railway track, otherwise the rails will bend sideways.
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