When a bicycle tyre suddenly bursts, the air inside the tyre expands. This process is:
1. | isothermal | 2. | adiabatic |
3. | isobaric | 4. | isochoric |
An ideal gas goes from A to B via two processes, l and ll, as shown. If and are the changes in internal energies in processes I and II, respectively, then (\(P:\) pressure, \(V:\) volume)
1. | ∆U1 > ∆U2 | 2. | ∆U1 < ∆U2 |
3. | ∆U1 = ∆U2 | 4. | ∆U1 ≤ ∆U2 |
In a given process, dW = 0, dQ < 0, then for the gas:
1. Temperature increases
2. Volume decreases
3. Pressure decreases
4. Pressure increases
An ideal gas goes from state \(A\) to state \(B\) via three different processes, as indicated in the \(P\text-V\) diagram. If \(Q_1,Q_2,Q_3\) indicates the heat absorbed by the gas along the three processes and \(\Delta U_1, \Delta U_2, \Delta U_3\) indicates the change in internal energy along the three processes respectively, then:
1. | \({Q}_1>{Q}_2>{Q}_3 \) and \(\Delta {U}_1=\Delta {U}_2=\Delta {U}_3\) |
2. | \({Q}_3>{Q}_2>{Q}_1\) and \(\Delta {U}_1=\Delta {U}_2=\Delta {U}_3\) |
3. | \({Q}_1={Q}_2={Q}_3\) and \(\Delta {U}_1>\Delta {U}_2>\Delta {U}_3\) |
4. | \({Q}_3>{Q}_2>{Q}_1\) and \(\Delta {U}_1>\Delta {U}_2>\Delta {U}_3\) |
A monoatomic gas is supplied with the heat \(Q\) very slowly, keeping the pressure constant. The work done by the gas will be:
1. \({2 \over 3}Q\)
2. \({3 \over 5}Q\)
3. \({2 \over 5}Q\)
4. \({1 \over 5}Q\)
A sample of \(0.1\) g of water at \(100^{\circ}\mathrm{C}\) and normal pressure (\(1.013 \times10^5\) N m–2) requires \(54\) cal of heat energy to convert it into steam at \(100^{\circ}\mathrm{C}\). 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
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 |
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 |
A system is taken from state A to state B along two different paths, 1 and 2. If the heat absorbed and work done by the system along these two paths are respectively, then:
1. | \(Q_1=Q_2\) |
2. | \(W_1=W_2\) |
3. | \(Q_1-W_1=Q_2-W_2\) |
4. | \(Q_1+W_1=Q_2+W_2\) |