# If in the thermodynamic process shown in the figure, the work done by the system along A $\to$ B $\to$ C is 50 J and the change in internal energy during C $\to$ A is 30 J, then the heat supplied during A $\to$ B $\to$ C is:           1. 50 J  2. 20 J 3. 10 J  4. 80 J

Subtopic:  Cyclic Process |
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The pressure in a monoatomic gas increases linearly from 4 atm to 8 atm when its volume increases from 0.2 m${}^{3}$ to 0.5 m${}^{3}$. The increase in internal energy will be:

 1 480 kJ 2 550 kJ 3 200 kJ 4 100 kJ
Subtopic:  Molar Specific Heat |
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The degree of freedom per molecule for a gas on average is 8. If the gas performs 100 J of work when it expands under constant pressure, then the amount of heat absorbed by the gas is:
1. 500 J
2. 600 J
3. 20 J
4. 400 J

Subtopic:  First Law of Thermodynamics |
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An ideal gas is taken through the cycle $A\to B\to C\to A$ as shown in figure below. If the net heat supplied to the gas is 10 J, then the work done by the gas in the process $B\to C$ is

 1 -10 J 2 -30 J 3 -15 J 4 -20 J
Subtopic:  Cyclic Process |
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An ideal gas undergoes a cyclic process ABCA as shown. The heat exchange between the system and the surrounding during the process will be:

 1 10 J 2 5 J 3 15 J 4 20 J
Subtopic:  Cyclic Process |
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If the ratio of specific heat of a gas at constant pressure to that at constant volume is $\mathrm{\gamma }$, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure, P is:

 1 $\mathrm{R}/\left(\mathrm{\gamma }-1\right)$ 2 PV 3 $\mathrm{PV}/\left(\mathrm{\gamma }-1\right)$ 4 $\mathrm{PV}\left(\mathrm{\gamma }-1\right)$
Subtopic:  Molar Specific Heat |
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An ideal gas is taken through the process as shown in the figure. Then:

 1 In the process AB, the work done by the system is positive. 2 In process AB, heat is rejected out of the system. 3 In the process AB, internal energy increases. 4 In the process AB, internal energy decreases, and in the process BC, internal energy increases.

Subtopic:  First Law of Thermodynamics |
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ABCA is a cyclic process. Its P-V graph would be:

 1 2 3 4
Subtopic:  Cyclic Process |
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In the P-V diagram shown, the gas does 5 J of work in the isothermal process ab and 4 J in the adiabatic process bc. What will be the change in internal energy of the gas in the straight path from c to a?

1. 9J

2. 1 J

3. 4 J

4. 5 J

Subtopic:  Cyclic Process |
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A horizontal cylinder has two sections of unequal cross-sections in which two pistons, A and B, can move freely. The pistons are joined by a string. Some gas is trapped between the pistons. If this gas is heated, the pistons will:

 1 move to the left. 2 move to the right. 3 remain stationary. 4 move either to the left or to the right depending on the initial pressure of the gas.

Subtopic:  First Law of Thermodynamics |
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