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BCECE Engineering BCECE Engineering Solved Paper-2003

  • question_answer
    What is AE for system that does 500 cal of work on surrounding and 300 cal of heat is absorbed by the system?

    A) \[-200\]cal       

    B)        \[-300\]cal

    C) \[+\,200\]cal      

    D)        \[+\text{ }300\]cal

    Correct Answer: A

    Solution :

    Key Idea: From first law of thermodynamic. \[\Delta \Epsilon =q+W\] Given \[q=+\,300\,cal\](\[\because \]heat is absorbed) \[W=-500\,\text{cal}\] (\[\because \]work is done on surroundings). \[\therefore \]  \[\Delta \Epsilon =q+W\]                 \[=300+(-500)\]                 \[=-200\,cal.\]


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