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

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:

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

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

An ideal gas undergoes a cyclic process ABCA as shown. The heat exchange between the system and the surrounding during the process will be:

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. $\mathrm{PV}\left(\mathrm{\gamma }-1\right)$

An ideal gas is taken through the process as shown in the figure. Then:

ABCA is a cyclic process. Its P-V graph would be:

1.		2.
3.		4.

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

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: