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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    In a given process on an ideal gas, \[dW=0\]and \[dQ\text{ }<\text{ }0.\]Then for the gas     

    A) the temperature will decrease

    B) the volume will increase

    C) the pressure will remain constant

    D) the temperature will increase  

    Correct Answer: A

    Solution :

    [a] From the first law of thermodynamics \[dQ=dU+dW\] Here \[dW=0\] (given) \[\therefore ~dQ=dU\] Now since \[dQ<0\] (given) \[\therefore dQ\] is negative \[\Rightarrow dU=-ve\Rightarrow dU\text{ decreases}\text{.}\] \[\Rightarrow \] Temperature decreases.


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