Question 1: Thermodynamics & KTG

Question

One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where $V$ is the volume and $T$ is the temperature). Which of the statements below is (are) true?
![](https://imagex.cdn.examgoal.net/MdGAZN1wONeGEXGtY/TKxCRxGEVPcDOs7XbIpkMxaBWk3cY/ZFrK8FKSCgjCht3zDK3tEj/image.png)

Accepted Answer

In process I, volume is changing. Therefore, it is not isochoric. Therefore 'A' is incorrect.
In process II, q = $\Delta$U + W . $\Delta$U = 0 as temperature is constant. Therefore, q = W. Here W = P(V
f
$-$ V
i
) is positive therefore q is positive i.e., gas absorbs heat. Therefore 'B' is correct.
For process IV, q = $\Delta$U + W. Here $\Delta$ = 0 and W is negative (volume decreases). Therefore q is negative i.e., gas releases heat. 'C' is correct.
For an isobaric process, V $\propto$ T i.e., we will get a straight inclined line in T-V graph. Therefore I and II are NOT isobaric. 'D' is correct.

Answer

Process ${\rm I}$ is an isochoric process

Answer

In process ${\rm II}$, gas absorbs heat

Answer

In process ${\rm IV}$, gas releases heat

Answer

Process ${\rm I}$ and ${\rm III}$ are
not
isobaric

Thermodynamics & KTG

One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where V is the volume and T is the temperature). Which of the statements below is (are) true?

Choose the correct answer: