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Standard XII

Physics

Thermodynamic Processes

An ideal gas ...

Question

An ideal gas undergoes a thermodynamic cycle as shown in figure. Which of the following statements are correct?

Straight line

A B

cannot pass through

O

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During process

A B

, temperature decreases while during process

B C

it increases.

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During process

B C

, work is done by the gas against external pressure and temperature of the gas increases.

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During process

C A

, work is done by the gas against external pressure and heat supplied to the gas is exactly equal to this work.

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Solution

The correct option is C Straight line $A B$ cannot pass through $O$ .
a. Theoretically, B can pass through O because that would mean $0$ pressure and $0$ volume.

b. AB is isobaric and increases with temperature. BC is isochoric and increases with temperature.

c. BC is isochoric. So no work done.

d. This is a polytropic process and $H$ isn't equal to $W$

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