1. Tardigrade
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  4. Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram Consider the following statements I. Area A B C D= Work done on the gas II. Area A B C D= Net heat absorbed III. Change in the internal energy in cycle =0 Which of these are correct?

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Q. Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram Consider the following statements
I. Area $A B C D=$ Work done on the gas
II. Area $A B C D=$ Net heat absorbed
III. Change in the internal energy in cycle $=0$
Which of these are correct?Physics Question Image

Thermodynamics

Solution:

Work done by the gas (as cyclic process is clockwise)
$\therefore \Delta W=$ Area $A B C D$
So from the first law of thermodynamics $\Delta Q$
(net heat absorbed) $=\Delta W=$ Area $A B C D$
As change in internal energy in cycle $\Delta U=0$.