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      Question

      A copper disc has a hole. If the disc is heated, the

      size of the hole -
      A increases Correct Answer Incorrect Answer
      B decreases Correct Answer Incorrect Answer
      C No change Correct Answer Incorrect Answer
      D first increases and than decreases Correct Answer Incorrect Answer

      Solution

      Whenametalplatewithacircular holeatits centreisheated,definitelyalongwith the areal expansion of the plate the diameter (sum of two radii) of the circular hole also increases.

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