Carnot cycle (reversible) of a gas represented by a pressure volume curve is shown in the diagram
Consider the following statement
I Area ABCD = Work done on the gas
II Area ABCD = Net heat absorbed
III Change in the internal energy in cycle = `0`
Which of these are correct?

Options

A. I only
B. II only
C. II and III
D. I, II and III

Answer

C

Explanation

Work done by the gas (as cyclic process is clockwise )
`:. DeltaW = Area ABCD`
so from the first law of thermodynamics `Delta Q` (net heat absorbed) = `DeltaW = Area ABCD`
as change in internal energy in cycle `DeltaU = 0`.