If the ratio of specific heat of a gas at constant pressure to that at constant volume is , the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure, P is:
1. | 2. | PV | |
3. | 4. |
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
The pressure in a monoatomic gas increases linearly from 4 atm to 8 atm when its volume increases from 0.2 m to 0.5 m. The increase in internal energy will be:
1. | 480 kJ | 2. | 550 kJ |
3. | 200 kJ | 4. | 100 kJ |
If in the thermodynamic process shown in the figure, the work done by the system along A B C is 50 J and the change in internal energy during C A is 30 J, then the heat supplied during A B C is:
1. | 50 J | 2. | 20 J |
3. | 10 J | 4. | 80 J |
\(ABCA\) is a cyclic process. Its \(P\text-V\) 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:
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. |
An ideal gas is taken through the cycle 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 is
1. | -10 J | 2. | -30 J |
3. | -15 J | 4. | -20 J |
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 |
The pressure of a monoatomic gas increases linearly from N/m2 to N/m2 when its volume increases from 0.2 m3 to 0.5 m3. The work done by the gas is:
1.
2.
3.
4.