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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from \[A\to B\to C\]is 30J, and 40J heat is given to the system. The change in internal energy between A and C is:

    A) 10J                  

    B)   70J      

    C) 84J                              

    D) 134J

    Correct Answer: D

    Solution :

    [d] Heat given \[\Delta Q=20cal\text{ }=\text{ }20\times 4.2=84J\] Work done \[\Delta W=-\,50\text{ }J\] [Process Anticlockwise] Ist law of thermodynamics \[\Delta U=\Delta Q-\Delta W\] \[=84-(-50)\] \[=134J\]


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