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Physics Thermodynamics Adiabatic Process Single Correct MCQ
Published on: September 12, 2026

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

A
$\Delta U = -W$ 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

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The correct answer is:
A

According to the first law of thermodynamics

$\Delta Q = \Delta U + \Delta W$

In adiabatic process $\Delta Q = 0$ , hence $dU = - dW$

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