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11. thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an
  • A
    Isothermal change
  • ✓
    Adiabatic change
  • C
    Isobaric change
  • D
    Isochoric change
✓

Answer

Correct option: B.
Adiabatic change
b
(b)In adiabatic change $Q =$ constant ==> $\Delta Q = 0$
So $\Delta W = -  \Delta U \, ( \, \Delta Q = \Delta U + \Delta W)$

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