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

  • question_answer
    If \[\Delta Q\] and \[\Delta W\] represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as      [Roorkee 2000]

    A)            \[\Delta Q=\Delta U+\Delta W\]                                     

    B)            \[\Delta Q=\Delta U-\Delta W\]

    C)            \[\Delta Q=\Delta W-\Delta U\]                                      

    D)            \[\Delta Q=-\Delta W-\Delta U\] where \[\Delta U\] is the internal energy

    Correct Answer: B

    Solution :

                       From FLOT\[\Delta Q=\Delta U+\Delta W\] Q Heat supplied to the system so DQ ® Positive and work is done on the system so DW ® Negative Hence +DQ  = DU ? DW


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