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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Topic Test - Thermometry, Thermal Expansion and Calorimetry (3-5-21)

  • 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                       

    A) 350 cal

    B) 150 cal

    C) 60 cal

    D) 6 cal

    Correct Answer: A

    Solution :

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


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