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One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,

The change in internal energy of the gas during the transition is:

  • Option 1)

    20 J

  • Option 2)

    -12 kJ

  • Option 3)

    20 kj

  • Option 4)

    -20 kJ

 
As we learnt in  Total internal energy -   - wherein Change in internal energy (Always) is degree of freedom   or     Option 1) 20 J Incorrect Option 2) -12 kJ Incorrect Option 3) 20 kj Correct Option 4) -20 kJ Incorrect
Medical
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Figure below shows two paths that may be taken by a gas to go from a state A to a state C.

In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be:

  • Option 1)

    460 J

  • Option 2)

    300 J

  • Option 3)

    380 J

  • Option 4)

    500 J

 
As we learnt in  Work by area - If we plot a process on PV diagram.Then area under the curve will give work done. - wherein   , isochoric process  isobaric process                                        Correct option is 1.   Option 1) 460 J Correct Option 2) 300 J Incorrect Option 3) 380 J Incorrect Option 4) 500 J Incorrect
Medical
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A Carnot engine, having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is:

  • Option 1)

    90 J

  • Option 2)

    1 J

  • Option 3)

    100 J

  • Option 4)

    99 J

 
As we learnt in  Coefficient of performance (beta) -   - wherein For a perfect refrigerator     AND     Efficiency of a carnot cycle -   are in kelvin   - wherein Source temperature Sink Temperature   Correct option is 1. Option 1) 90 J This option is correct Option 2) 1 J This option is incorrect Option 3) 100 J This option is incorrect Option 4) 99 J This option is incorrect
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