Q. No.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:
| 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 in the figure. Consider the following statements:
| I. | The area \(ABCD\) = The work done on the gas |
| II. | The area \(ABCD\) = The net heat absorbed |
| III. | The change in the internal energy in the 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
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