2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-21

  • question_answer
    In a system, a piston caused an expansion against an external pressure of 1.2 atmgivinga change in volume of 32 It. for which \[\Delta \,E\text{ }=\text{ }-51\text{ }kJ.\]What was the value of heat involved ? (Take 1 It atm = 100 J)

    A)  - 36 kJ            

    B)  - 13 kJ

    C)  - 47kJ              

    D)  - 24kJ

    Correct Answer: C

    Solution :

    \[w=-{{P}_{ext}}.\,dv\] \[=-38.4\times 100J\,=-3840\,J=-3\,.87\,kJ\] \[\Delta E=q+w\] So, \[q=\Delta E\,-w=-51\,\,+3.84\,=-47.16\,kJ\]


You need to login to perform this action.
You will be redirected in 3 sec spinner