JEE Main & Advanced Physics Thermodynamical Processes Question Bank Topic Test - Thermodynamical Process (2021)

  • 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) \[\Delta Q=-\Delta W-\Delta U\]

    Correct Answer: B

    Solution :

    [b] 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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