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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    When a system is taken from state i to state f along the path iaf, it is found that Q=50 cal and W = 20 cal. along the path ibf Q = 36 cal. W along the path ibf is:

    A) 14 cal               

    B) 6cal   

    C) 16 cal                           

    D) 66 cal

    Correct Answer: B

    Solution :

    [b] \[\Delta {{U}_{iaf}}={{Q}_{iaf}}-{{W}_{iwf}}\] \[=50-20=30cal\] For path ibf \[{{Q}_{ibf}}=\Delta {{U}_{ibf}}-{{W}_{ibf}}\] \[\Delta \,{{U}_{iaf}}=\Delta {{U}_{ibf}}\] (\[\Delta U\]path independent) \[{{Q}_{ibf}}=\Delta {{U}_{iaf}}-{{W}_{ibf}}\] \[{{W}_{ibf}}={{Q}_{ibf}}-\Delta {{U}_{iaf}}\]             \[=36-60=6cal.\]


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