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

    2. A.

     Increases
    B.

     Decreases
    C.

     No change
    D.

     First increases and than decreases

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    Answer : Option A

    Explanation :

    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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