JEE Main & Advanced Sample Paper JEE Main - Mock Test - 38

  • question_answer
    A gaseous system undergoes a change of state from (1) to (2) by any of the given path : path-I or path- II as shown in figure As per path -I, \[\Delta q=-400\,cal\] and \[\Delta W=14cal\] As per path-II, \[\Delta q=-48cal\]. Therefore work done, \[\Delta W\] in path -(II) is-

    A) \[-338\,cals\]       

    B)        \[-366\,cals\]

    C) \[-434\text{ }cals\]        

    D)        \[-462\text{ }cals\]

    Correct Answer: A

    Solution :

    [a] For path - I \[\Delta {{E}_{1}}=\Delta q+\Delta W=-400+14\]              \[=-386\,cals\] For path -II     \[\Delta {{E}_{II}}=\Delta {{E}_{I}}=-48+\Delta W\] \[\therefore \text{ }\Delta W=-386+48=-338cal\]


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