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ICSE Class 8 Physics Question 8 of 19

Heat Transfer — Question 9

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9
Question

Question 1(i)

The correct statement is:

  1. Iron rims are cooled before they are placed on the cart wheels.
  2. A glass stopper gets tightened on warming the neck of the bottle.
  3. Telephone wires sag in winter, but become tight in summer.
  4. A little space is left between two rails on a railway track.
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.