Heat and Thermodynamics 5 Question 34

35. One mole of a monoatomic 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?

(2018 Adv.)

(a) Process I is an isochoric process

(b) In process II, gas absorbs heat

(c) In process IV, gas releases heat

(d) Processes I and III are not isobaric

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Answer:

Correct Answer: 35. (b,c,d)

Solution:

  1. Process-II is isothermal expansion,

$$ \begin{gathered} \Delta U=0, W>0 \\ \Delta Q=W>0 \end{gathered} $$

Process-IV is isothermal compression,

$$ \begin{aligned} & \Delta U=0, W<0 \\ & \Delta Q=W<0 \end{aligned} $$

Process-I and III are not isobaric because in isobaric process $T \propto V$ hence, $T$ - $V$ graph should be a straight line passing through origin.

Option b, c and d are true.



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