- 1(current)
Q. No.Given below are two statements:
| Assertion (A): | It is not possible for a system, unaided by an external agency to transfer heat from a body at a lower temperature to another at a higher temperature. |
| Reason (R): | It is not possible to violate the second law of thermodynamics. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Second Law of Thermodynamics |
71%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | The temperature of the surface of the sun is approximately \(6000\) K. If we take a big lens and focus the sun rays, we can produce a temperature of \(8000\) K. |
| Reason (R): | This is the highest temperature that can be produced according to the second law of thermodynamics. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Second Law of Thermodynamics |
Level 3: 35%-60%
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Consider a cycle followed by an engine (figure).
1 to 2 is isothermal,
2 to 3 is adiabatic,
3 to 1 is adiabatic.
Such a process does not exist, because:
| (a) | heat is completely converted to mechanical energy in such a process, which is not possible. |
| (b) | In this process, mechanical energy is completely converted to heat, which is not possible. |
| (c) | curves representing two adiabatic processes don’t intersect. |
| (d) | curves representing an adiabatic process and an isothermal process don't intersect. |
Choose the correct alternatives:
| 1. | (a), (b) | 2. | (a), (c) |
| 3. | (b), (c) | 4. | (c), (d) |
Subtopic: First Law of Thermodynamics | Second Law of Thermodynamics |
56%
Level 3: 35%-60%
Hints
The second law of thermodynamics says:
| 1. | the efficiency of a heat engine can be unity. |
| 2. | the heat released to the cold reservoir can be made zero. |
| 3. | coefficient of performance can never be infinite for refrigerators. |
| 4. | none of the above. |
Subtopic: Second Law of Thermodynamics |
60%
Level 2: 60%+
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Q. No.
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