If the internal energy of an ideal gas decreases by the same amou… - Vidyadip

MCQ

If the internal energy of an ideal gas decreases by the same amount as the work done by the system, the process is

A
cyclic
B
isothermal
✓
adiabatic
D
isolated

✓

Answer

Correct option: C.

adiabatic

c
From the question, $\Delta U = W \quad \rightarrow( i )$

But from the $1^{\text {st }}$ law of thermodynamics,

$\Delta U = q + w \rightarrow(\text { ii) }$

From equation $(i)$ and $(ii)$

$q=0$

Therefore, the process is adiabatic.

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