The efficiency of an ideal heat engine is less than 100% because of:

1.	the presence of friction.
2.	the leakage of heat energy.
3.	unavailability of the sink at zero kelvin.
4.	All of these

A heat engine operates between the temperatures of 300 K and 500 K. If it extracts 1200 J of heat energy from the source, then the maximum amount of work that can be done by the engine is:

1. 720 J

2. 520 J

3. 480 J

4. 200 J

If 3 moles of a monoatomic gas do 150 J of work when it expands isobarically, then a change in its internal energy will be:

In the case of free expansion, when a sample of gas expands suddenly, the change in internal energy of the gas will be:

1. Positive

2. Negative

3. Zero

4. May be positive or negative

The work done for the given process AB is:

1. 6$P_0{V}_0$

2. 5$P_0{V}_0$

3. 3$P_0{V}_0$

4. 2$P_0{V}_0$

The efficiency of a Carnot heat engine working between the temperatures \(27^{\circ}\mathrm{C}\)$$ and \(227^{\circ}\mathrm{C}\) is:
1. 0.1
2. 0.6
3. 0.2
4. 0.4

Work done during the given cycle is:
                               
1. 4$P_0{V}_0$

2. 2$P_0{V}_0$

3. $\frac{1}{2}$$P_0{V}_0$

4. $P_0{V}_0$

The cyclic process of 2 moles of diatomic gas is shown in the figure. Which of the following statements is correct?

An ideal gas is enclosed in an insulated cylinder. The piston is frictionless and attached to an ideal spring. When the gas is heated, then:
           

If a gas undergoes the change in its thermodynamic state from A to B via two different paths, as shown in the given pressure (P) versus volume (V) graph, then: