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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Calorimetry

  • question_answer
    A body of mass 5 kg falls from a height of 30 metre. If its all mechanical energy is changed into heat, then heat produced will be                                                         [CPMT 1975]

    A)            350 cal                                    

    B)            150 cal

    C)            60 cal                                       

    D)            6 cal

    Correct Answer: A

    Solution :

                       \[W=JQ\] Þ \[mgh=J\times H\]            Þ \[Q=\frac{mgh}{J}=\frac{5\times 9.8\times 30}{4.2}=350\,cal\]


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