MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The temperature of sink of Carnot s engine is 27 C. If the efficiency of the engine is 25%, then the temperature of source must be ___________ |
| A. | 27 C |
| B. | 127 C |
| C. | 227 C |
| D. | 327 C |
| Answer» C. 227 C | |
| 2. |
The efficiency of Carnot s engine operating between reservoirs, maintained at temperature 27 C and -123 C is ___________ |
| A. | 50% |
| B. | 24% |
| C. | 0.75% |
| D. | 0.4% |
| Answer» B. 24% | |
| 3. |
Assertion: In adiabatic compression, the internal energy and temperature of the system gets decreased.
|
| A. | Both assertion and reason are true and the reason is the correct explanation of the assertion |
| B. | Both assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | Assertion is true but the reason is false |
| D. | Both assertion and reason are false |
| Answer» E. | |
| 4. |
If the temperature of the source is increased, the efficiency of a Carnot engine? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First increases and then remains constant |
| Answer» B. Decreases | |
| 5. |
A perfect gas is contained in a cylinder kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas ___________ |
| A. | Becomes zero K |
| B. | Is decreased |
| C. | In increased |
| D. | Remains unchanged |
| Answer» E. | |
| 6. |
The freezer in a refrigerator is located at the top section so that ___________ |
| A. | The entire chamber of the refrigerator is cooled quickly due to convection |
| B. | The motor is not heated |
| C. | The heat gained from the environment is high |
| D. | The heat gained from the environment is low |
| Answer» B. The motor is not heated | |
| 7. |
The temperature of sink of Carnot engine is 27 C. Efficiency is 25%. Then ___________ |
| A. | 227 C |
| B. | 327 C |
| C. | 127 C |
| D. | 27 C |
| Answer» D. 27 C | |
| 8. |
The temperature of reservoir of Carnot s engine operating with an efficiency of 70% is 1000K. What is the temperature of source? |
| A. | 300K |
| B. | 400K |
| C. | 500K |
| D. | 700K |
| Answer» B. 400K | |
| 9. |
In a given process of an ideal gas, dW=0 and the dQ<0. Then for the gas ___________ |
| A. | The temperature will decreases |
| B. | The temperature will increase |
| C. | The pressure will remain constant |
| D. | The temperature will increase |
| Answer» B. The temperature will increase | |