MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
20J of heat energy is extracted from a cold reservoir when 30J of work is done on a refrigerator. What is the coefficient of the refrigerator? |
| A. | 2/3 |
| B. | 5/3 |
| C. | 3/5 |
| D. | 1/3 |
| Answer» B. 5/3 | |
| 2. |
The coefficient of a refrigerator can be greater than 1. True or False? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Efficiency of a refrigerator can be greater than 1. True or False? |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Select the correct order of steps in which a working substance(gas) goes through in a refrigerator. |
| A. | Expansion of gas, absorption of heat, heating of vapour, release of heat |
| B. | Absorption of heat, expansion of gas, heating of vapour, release of heat |
| C. | Heating of vapour, expansion of gas, absorption of heat, release of heat |
| D. | Heating of vapour, absorption of heat, expansion of gas, release of heat |
| Answer» B. Absorption of heat, expansion of gas, heating of vapour, release of heat | |
| 5. |
What is the coefficient of performance of a refrigerator? Let Q1 be the heat released to hot reservoir, Q2 be the heat extracted from a cold reservoir & W be the work done on the refrigerator. |
| A. | Q1/W |
| B. | Q1/Q2 |
| C. | Q2/W |
| D. | Q2/Q1 |
| Answer» D. Q2/Q1 | |