MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 24 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. |
During adiabatic compression of a gas, its temperature ___________ |
| A. | Falls |
| B. | Remains constant |
| C. | Rises |
| D. | Becomes zero |
| Answer» D. Becomes zero | |
| 2. |
The change in internal energy, when a gas is cooled from 927° to 27° is? |
| A. | 100% |
| B. | 300% |
| C. | 200% |
| D. | 75% |
| Answer» E. | |
| 3. |
Assertion: Reversible systems are difficult to find in the real world.Reason: Most process is dissipative in nature. |
| 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» B. Both assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 4. |
If the amount of heat given to a system is 35 J and the amount of work done by the system is -15J and the amount of work done by the system is -15J, then the change in the internal energy of the system is? |
| A. | -50J |
| B. | 20J |
| C. | 30 |
| D. | 50J |
| Answer» E. | |
| 5. |
The latent heat of vaporisation of water is 2,240 J. If the work done in the process of vaporisation of 1g is 168 J, then the increase in internal energy is? |
| A. | 2408 J |
| B. | 2240 J |
| C. | 2072 J |
| D. | 1904 J |
| Answer» D. 1904 J | |
| 6. |
Which is an intensive property? |
| A. | Volume |
| B. | Mass |
| C. | Refractive index |
| D. | Weight |
| Answer» D. Weight | |
| 7. |
Which statement is incorrect? |
| A. | All reversible cycles have the same efficiency |
| B. | Reversible cycle has more efficiency than an irreversible one |
| C. | Carnot cycle is a reversible one |
| D. | Carnot cycle has the maximum efficiency of the cycles |
| Answer» B. Reversible cycle has more efficiency than an irreversible one | |
| 8. |
The change internal energy in a cyclic process is ___________ |
| A. | Zero |
| B. | Infinity |
| C. | Constant |
| D. | Unity |
| Answer» B. Infinity | |
| 9. |
The molar specific heat constant pressure of an ideal gas is 7R/2. The ratio of specific heat at constant pressure to that at constant volume is? |
| A. | 9/7 |
| B. | 8/7 |
| C. | 7/5 |
| D. | 5/7 |
| Answer» D. 5/7 | |
| 10. |
110 J of heat is added to a gaseous system, whose internal energy increases by 40 J. Then the amount of external work done is? |
| A. | 150 J |
| B. | 70 J |
| C. | 110 J |
| D. | 40 J |
| Answer» C. 110 J | |
| 11. |
The internal energy change in a system that has absorbed 2kcal of heat and done 500 J of work is? |
| A. | 6400 J |
| B. | 5400 J |
| C. | 7900 J |
| D. | 8900 J |
| Answer» D. 8900 J | |
| 12. |
THE_LATENT_HEAT_OF_VAPORISATION_OF_WATER_IS_2,240_J._IF_THE_WORK_DONE_IN_THE_PROCESS_OF_VAPORISATION_OF_1G_IS_168_J,_THEN_THE_INCREASE_IN_INTERNAL_ENERGY_IS?$ |
| A. | 2408 J |
| B. | 2240 J |
| C. | 2072 J |
| D. | 1904 J |
| Answer» D. 1904 J | |
| 13. |
Assertion: Reversible systems are difficult to find in the real world$ |
| A. | |
| B. | Both assertion and reason are true and the reason is the correct explanation of the assertion |
| C. | Both assertion and reason are true but the reason is not a correct explanation of the assertion |
| Answer» B. Both assertion and reason are true and the reason is the correct explanation of the assertion | |
| 14. |
If_the_amount_of_heat_given_to_a_system_is_35_J_and_the_amount_of_work_done_by_the_system_is_-15J_and_the_amount_of_work_done_by_the_system_is_-15J,_then_the_change_in_the_internal_energy_of_the_system_is$ |
| A. | -50J |
| B. | 20J |
| C. | 30 |
| D. | 50J |
| Answer» E. | |
| 15. |
During adiabatic compression of a gas, its temperature |
| A. | Falls |
| B. | Remains constant |
| C. | Rises |
| D. | Becomes zero |
| Answer» D. Becomes zero | |
| 16. |
The change in internal energy, when a gas is cooled from 927° to 27°, is$ |
| A. | 100% |
| B. | 300% |
| C. | 200% |
| D. | 75% |
| Answer» E. | |
| 17. |
Which is an intensive property? |
| A. | Volume |
| B. | Mass |
| C. | Refractive index |
| D. | Weight |
| Answer» D. Weight | |
| 18. |
Which statement is incorrect? |
| A. | All reversible cycles have the same efficiency |
| B. | Reversible cycle has more efficiency than an irreversible one |
| C. | Carnot cycle is a reversible one |
| D. | Carnot cycle has the maximum efficiency of the cycles |
| Answer» B. Reversible cycle has more efficiency than an irreversible one | |
| 19. |
The mechanical energy can be completely converted into heat energy but the whole of the heat energy cannot be converted into mechanical energy. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
It is possible that the temperature of the body changes even without giving heat to it or taking heat from it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
The change internal energy in a cyclic process is |
| A. | Zero |
| B. | Infinity |
| C. | Constant |
| D. | Unity |
| Answer» B. Infinity | |
| 22. |
The molar specific heat constant pressure of an ideal gas is 7R/2. The ratio of specific heat at constant pressure to that at constant volume is |
| A. | 9/7 |
| B. | 8/7 |
| C. | 7/5 |
| D. | 5/7 |
| Answer» D. 5/7 | |
| 23. |
110 J of heat is added to a gaseous system, whose internal energy increases by 40 J. Then the amount of external work done is |
| A. | 150 J |
| B. | 70 J |
| C. | 110 J |
| D. | 40 J |
| Answer» C. 110 J | |
| 24. |
The internal energy change in a system that has absorbed 2kcal of heat and done 500 J of work is |
| A. | 6400 J |
| B. | 5400 J |
| C. | 7900 J |
| D. | 8900 J |
| Answer» D. 8900 J | |