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MGIMS WARDHA MGIMS WARDHA Solved Paper-2011

  • question_answer
    An ice box made of Styrofoam (thermal conductivity \[=0.01J{{m}^{=1}}K)\] is used to keep liquids cool. It has a total wall area including lid of0.8 m2 and wall thickness of 2.0 cm. A bottle of water is placed in the box and filled with ice. If the outside temperature is 30°C, the rate of flow of, heat into the box is (in Js-1)

    A)  16                                         

    B)  14

    C)  12                                         

    D)  10

    Correct Answer: C

    Solution :

                     \[H=\frac{Q}{t}=\frac{KA({{\theta }_{1}}-{{\theta }_{2}})}{l}=\frac{0.01\times 0.8(30-0)}{2\times {{10}^{-2}}}\]\[=12\,J{{S}^{-1}}\]


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