A gas undergoes an isothermal process. The specific heat capacity of the gas in the process is:
1.  infinity
2.  0.5
3.  zero
4.  1

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is : 

1. adiabatic 

2. isochoric 

3. isobaric 

4. isothermal 

The efficiency of a Carnot engine depends upon:

1. the temperature of the sink only.

2. the temperatures of the source and the sink.

3. the volume of the cylinder of the engine.

4. the temperature of the source only.

The P-V diagram for an ideal gas in a piston-cylinder assembly undergoing a thermodynamic process is shown in the figure. The process is:

1.  adiabatic 

2.  isochoric

3.  isobaric 

4.  isothermal 

In which of the following processes, the heat is neither absorbed nor released by a system?

1. Isochoric

2. Isothermal

3. Adiabatic

4. Isobaric

1 g of water of volume 1 ${\mathrm{cm}}^3$ at $100 °\mathrm{C}$ is converted into steam at the same temperature under normal atmospheric pressure$\approx 1\times {10}^5 \mathrm{Pa}$. The volume of steam formed equals 1671 ${\mathrm{cm}}^3$. If the specific latent heat of vaporization of water is 2256 J/g, the change in internal energy is:

1. 2423 J

2. 2089 J

3. 167 J

4. 2256 J

A sample of 0.1 g of water at ${100}^0 C$ and normal pressure (1.013 × 10⁵ Nm^–2) requires 54 cal of heat energy to convert it into steam at ${100}^0 C$. If the volume of the steam produced is 167.1 cc, then the change in internal energy of the sample will be:

1. 104.3 J

2. 208.7 J

3. 42.2 J

4. 84.5 J

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state A to state B will be:
         

1. $\frac{2}{5}$

2. $\frac{2}{3}$

3. $\frac{1}{3}$

4. $\frac{2}{7}$

The efficiency of an ideal heat engine working between the freezing point and boiling point of water is:

1. 26.8%

2. 20%

3. 6.25%

4. 12.5%