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Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
We consider a thermodynamic system. If $\Delta U$ represents the increase in its internal energy and $W$ the work done by the system, which of the following statements is true
  • ✓
    $\Delta U=-W$ in an adiabatic process
  • B
    $\Delta U=W$ in an isothermal process
  • C
    $\Delta U=-W$ in an isothermal process
  • D
    $\Delta U=W$ in an adiabatic process
✓

Answer

Correct option: A.
$\Delta U=-W$ in an adiabatic process
(a) According to the first law of thermodynamics$\Delta Q=\Delta U+\Delta W$In adiabatic process $\Delta Q=0$, hence $\Delta U=-\Delta W$

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