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NEET Sample Paper NEET Sample Test Paper-71

  • 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 

    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 \[\Delta Q=\Delta U+\Delta W\] \[\therefore \] Heat supplied to the system so \[\Delta Q\to Positive\] and work is done on the system so \[\Delta W\to Negative\] Hence \[+\Delta Q=\Delta U-\Delta W\]


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