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Question

Why are girders used in bridges provided with rollers?


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Solution

Explanation:

  1. Bridges are mounted on steel rollers.
  2. Because it expands on heating and contract on cooling.
  3. So, leaving a small space in between for the expansion and contraction.
  4. Thus, the bridge is saved from collapse.
  5. In a construction of a bridge, Steel girders are used.

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