A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : and . 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 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 and D respectively
(2) D and C respectively
(3) A and B respectively
(4) B and A 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-T diagram. The work done in AB, BC and CA respectively is:
1. | \(0, R T_2 \ln \left(\frac{V_1}{V_2}\right), R\left(T_1-T_2\right)\) |
2. | \(R\left(T_1-T_2\right), 0, R T_1 \ln \frac{V_1}{V_2}\) |
3. | \(0, R T_2 \ln \left(\frac{V_2}{V_1}\right), R\left(T_1-T_2\right)\) |
4. | \(0, R T_2 \ln \left(\frac{V_2}{V_1}\right), R\left(T_2-T_1\right)\) |
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. Consider the following statements:
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 the statement(s) given above is/are correct?
1. | I only | 2. | II only |
3. | II and III | 4. | I, II and III |
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