Multiple choice

In which of the following cases is the concept of contraction on cooling taken into consideration?

  1. The telephone wires between two poles are kept loose.

  2. A small gap is left in between the joints of a railway track.

  3. To unscrew a tight nut.

  4. A gap is left at one end of the bridge while laying girders.

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A Correct answer
Explanation

As we know that a substance contracts on cooling. So, the telephone wires between two poles are kept loose to allow their contraction during winter.

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