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JEE Main & Advanced Physics Thermodynamical Processes Question Bank First Law of Thermodynamics

  • question_answer
    If the amount of heat given to a system be 35 joules and the amount of work  done by the system be \[-15\]joules, then the change in the internal energy of the system is                                 [MP PMT 1989]

    A)            \[-50\] joules                       

    B)            20 joules

    C)            30 joules                                

    D)            50 joules

    Correct Answer: D

    Solution :

               \[\Delta Q=\Delta W+\Delta U\Rightarrow 35=-15+\Delta U\Rightarrow \Delta U=50J\]


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