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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

    When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter (sum of two radii) of the circular hole also increases.

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