A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : $P_A=3\times {10}^{4}Pa,P_B=8\times {10}^{4}Pa$ and $V_A=2\times {10}^{-3}{m}^3,V_D=5\times {10}^{-3}{m}^3$. In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be 

(1) 560 J

(2) 800 J

(3) 600 J

(4) 640 J

P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to -

(1) He and O₂

(2) O₂ and He

(3) He and Ar

(4) O₂ and N₂

Four curves \(A, B, C~\text{and}~D\) are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are:

      
1. \(C~\text{and}~D~\text{respectively}\)
2. \(D~\text{and}~C~\text{respectively}\)
3. \(A~\text{and}~B~\text{respectively}\)
4. \(B~\text{and}~A~\text{respectively}\)

In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively are -

(1) BA, AD, DC

(2) DC, CB, DA

(3) AB, BC, CD

(4) CD, DA, AB

An ideal gas is taken through the cycle A → B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is 

(1) – 5 J

(2) – 10 J

(3) – 15 J

(4) – 20 J

In the following indicator diagram, the net amount of work done will be

(1) Positive

(2) Negative

(3) Zero

(4) Infinity

A cyclic process for \(1\) mole of an ideal gas is shown in the \(V\text-T\) diagram. The work done in \(AB, BC\) and \(CA\) respectively is:

A cyclic process ABCD is shown in the P-V diagram. Which of the following P-T curves represent the same process ?

(1)

(2)

(3)

(4)

The Carnot cycle (reversible) of gas is represented by a pressure-volume curve as shown in the figure. Consider the following statements:

Which of the statement(s) given above is/are correct?

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

1. 1/3

2. 2/3

3. 1/2

4. 1/4