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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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