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  1. Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

    2. A.

     Rough white
    B.

     Rough black
    C.

     Shining white
    D.

     Shining black

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    Answer : Option B

    Explanation :

    Explanation Not Provided

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