Q. No.The first law of thermodynamics is a statement of:
| 1. | conservation of heat |
| 2. | conservation of work |
| 3. | conservation of momentum |
| 4. | conservation of energy |
If heat is supplied to an ideal gas in an isothermal process,
| 1. | the internal energy of the gas will increase. |
| 2. | the gas will do positive work. |
| 3. | the gas will do negative work. |
| 4. | the said process is not possible. |
Figure shows two processes \(A\) and \(B\) on a system. Let \(\Delta Q_1\) and \(\Delta Q_2\) be the heat given to the system in processes \(A\) and \(B\) respectively. Then:
1. \(\Delta Q_1>\Delta Q_2\)
2. \(\Delta Q_1=\Delta Q_2\)
3. \(\Delta Q_1<\Delta Q_2\)
4. \(\Delta Q_1\leq \Delta Q_2\)
Refer to the given figure. Let ΔU1 and ΔU2 be the changes in internal energy of the system in processes A and B. Then:
1. ΔU1 > ΔU2
2. ΔU1 = ΔU2
3. ΔU1 < ΔU2
4. ΔU1 ≠ ΔU2
Consider the process on a system shown in the figure. During the process, the work done by the system:
| 1. | continuously increases |
| 2. | continuously decreases |
| 3. | first increases then decreases |
| 4. | first decreases then increases |
Consider the following two statements.
| (A): | If heat is added to a system, its temperature must increase. |
| (B): | If positive work is done by a system in a thermodynamic process, its volume must increase. |
| 1. | Both A and B are correct. |
| 2. | A is correct but B is wrong. |
| 3. | B is correct but A is wrong. |
| 4. | Both A and B are wrong. |
An ideal gas goes from the state \(i\) to the state \(f\) as shown in figure given below. The work done by the gas during the process,
| 1. | is positive |
| 2. | is negative |
| 3. | is zero |
| 4. | cannot be obtained from this information |
Consider two processes on a system as shown in figure (26-Q4).The volumes in the initial states are the same in the two processes and the volumes in the final states are also the same. Let ΔW1 and ΔW2 be the work done by the system in the processes A and B respectively.
1. ΔW1 > ΔW2
2. ΔW1 = ΔW2
3. ΔW1 < ΔW2
4. Nothing can be said about the relation between ΔW1 and ΔW2
A gas is contained in a metallic cylinder fitted with a piston. The piston is suddenly moved in to compress the gas and is maintained at this position. As time passes the pressure of the gas in the cylinder
1. increases
2. decreases
3. remains constant
4. increases or decreases depending on the nature of the gas
The pressure \(p\) and volume \(V\) of an ideal gas both increase in a process.
| a. | such a process is not possible. |
| b. | the work done by the system is positive. |
| c. | the temperature of the system must increase. |
| d. | heat supplied to the gas is equal to the change in internal energy. |
Choose the correct option:
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)
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