MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
Heat capacity of a substance is infinite. It means ___________ |
| A. | Heat is given out |
| B. | Heat is taken out |
| C. | No change in temperature |
| D. | Heat is first given out and then taken out |
| Answer» D. Heat is first given out and then taken out | |
| 2. |
A Carnot engine working between 300 K and 600 K has a work output of 800 J per cycle. The amount of heat energy supplied to the engine from source per cycle is ___________ |
| A. | 1200J |
| B. | 1600J |
| C. | 2400J |
| D. | 3200J |
| Answer» C. 2400J | |
| 3. |
The door of a domestic refrigerator is kept open while the switch is on. Then the room will ___________ |
| A. | Get heated |
| B. | Ger neither heated nor cooled |
| C. | Gets cooled |
| D. | Gets heated first and then cools |
| Answer» B. Ger neither heated nor cooled | |
| 4. |
The inside and outside temperature of a refrigerator are 273K and 303K respectively. Assuming that refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be? |
| A. | 10 J |
| B. | 20 J |
| C. | 30 J |
| D. | 50 J |
| Answer» B. 20 J | |
| 5. |
Assertion: When a glass of hot milk placed in a room is allowed to cool, its entropy decreases.
|
| 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 the correct explanation of the assertion |
| C. | Assertion is true but the reason is false |
| D. | Both assertion and reason are false |
| Answer» C. Assertion is true but the reason is false | |
| 6. |
Calculate the work done if temperature is changes from 0 C to 200 C at one atmosphere. |
| A. | 100 cal |
| B. | 200 cal |
| C. | 400 cal |
| D. | 800 cal |
| Answer» D. 800 cal | |
| 7. |
A system, after passing through different states returns back to its original state, is called ___________ |
| A. | Cyclic process |
| B. | Isothermal process |
| C. | Adiabatic process |
| D. | Isobaric process |
| Answer» B. Isothermal process | |
| 8. |
In a thermal process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out the heat of 30J and work of 10J is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be? |
| A. | 30 J |
| B. | 20 J |
| C. | 60 J |
| D. | 40 J |
| Answer» D. 40 J | |