MCQOPTIONS
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MCQOPTIONS
This section includes 19 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 ratio of the vapour densities of two gases at a given temperature is 9:8. The ratio of the rms velocities of their molecules is ___________ |
| A. | 3:2√2 |
| B. | 2√2:3 |
| C. | 9:8 |
| D. | 8:9 |
| Answer» C. 9:8 | |
| 2. |
The temperature of a given mass is increased from 27°C to 327°C. The rms velocity of the molecules increases ___________ |
| A. | √2 times |
| B. | 2 times |
| C. | 2√2 times |
| D. | 4 times |
| Answer» B. 2 times | |
| 3. |
An absolute zero is the temperature at which? |
| A. | Water solidifies |
| B. | All gases become liquid |
| C. | rms velocity becomes zero |
| D. | Solids melt |
| Answer» D. Solids melt | |
| 4. |
The relation PV=RT can describe behaviour of the real gas at ___________ |
| A. | High temperature and high density |
| B. | High temperature and low density |
| C. | Low temperature and low density |
| D. | Low temperature and high density |
| Answer» C. Low temperature and low density | |
| 5. |
Statement: The ration Cp/Cv is more for helium gas than that for hydrogen gas.Reason: Atomic mass of helium is more than that of hydrogen. |
| A. | Both statement and reason are true and the reason is the correct explanation of the statement |
| B. | Both statement and reason are true but the reason is not a correct explanation of the statement |
| C. | Statement it true but the reason is false |
| D. | Both statement and reason are false |
| Answer» B. Both statement and reason are true but the reason is not a correct explanation of the statement | |
| 6. |
A given quantity of an ideal gas at pressure P and absolute temperature T. The isothermal bulk modulus of the gas is ___________ |
| A. | 2/3 P |
| B. | P |
| C. | 3/2 P |
| D. | 2P |
| Answer» B. P | |
| 7. |
When we heat a gas-sample from 27°C to 327°C, then the initial average kinetic energy of the molecules was E. What will b the average kinetic energy? |
| A. | 327E |
| B. | 300E |
| C. | 2E |
| D. | √2E |
| Answer» D. √2E | |
| 8. |
The absolute zero is the temperature, at which? |
| A. | All substances exist in a solid state |
| B. | Water freezes |
| C. | Molecular motion ceases |
| D. | Solid melts |
| Answer» D. Solid melts | |
| 9. |
In a vessel, the gas at a pressure P. If the mass of all molecules is halved and their speed is doubled, then the resultant pressure will be ___________ |
| A. | 4P |
| B. | 2P |
| C. | P |
| D. | P/2 |
| Answer» D. P/2 | |
| 10. |
THE_RATIO_OF_THE_VAPOUR_DENSITIES_OF_TWO_GASES_AT_A_GIVEN_TEMPERATURE_IS_9:8._THE_RATIO_OF_THE_RMS_VELOCITIES_OF_THEIR_MOLECULES_IS?$ |
| A. | 3:2‚àö2 |
| B. | 2‚àö2:3 |
| C. | 9:8 |
| D. | 8:9 |
| Answer» C. 9:8 | |
| 11. |
The temperature of a given mass is increased from 27°C to 327°C. The rms velocity of the molecules increase?# |
| A. | ‚àö2 times |
| B. | 2 times |
| C. | 2‚àö2 times |
| D. | 4 times |
| Answer» B. 2 times | |
| 12. |
An absolute zero is the temperature at whic? |
| A. | Water solidifies |
| B. | All gases become liquid |
| C. | rms velocity becomes zero |
| D. | Solids melt |
| Answer» D. Solids melt | |
| 13. |
The relation PV=RT can describe behaviour of the real gas at |
| A. | High temperature and high density |
| B. | High temperature and low density |
| C. | Low temperature and low density |
| D. | Low temperature and high density |
| Answer» C. Low temperature and low density | |
| 14. |
Statement: The ration Cp/Cv is more for helium gas than that for hydrogen gas |
| A. | |
| B. | Both statement and reason are true and the reason is the correct explanation of the statement |
| C. | Both statement and reason are true but the reason is not a correct explanation of the statement |
| Answer» B. Both statement and reason are true and the reason is the correct explanation of the statement | |
| 15. |
A given quantity of an ideal gas at pressure P and absolute temperature T. The isothermal bulk modulus of the gas is |
| A. | 2/3 P |
| B. | P |
| C. | 3/2 P |
| D. | 2P |
| Answer» B. P | |
| 16. |
Temperature less than absolute zero is not possible. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
When we heat a gas-sample from 27°C to 327°C, then the initial average kinetic energy of the molecules was E. What will b the average kinetic energy?$ |
| A. | 327E |
| B. | 300E |
| C. | 2E |
| D. | ‚àö2E |
| Answer» D. ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ2E | |
| 18. |
The absolute zero is the temperature, at which |
| A. | All substances exist in a solid state |
| B. | Water freezes |
| C. | Molecular motion ceases |
| D. | Solid melts |
| Answer» D. Solid melts | |
| 19. |
In a vessel, the gas at a pressure P. If the mass of all molecules is halved and their speed is doubled, then the resultant pressure will be |
| A. | 4P |
| B. | 2P |
| C. | P |
| D. | P/2 |
| Answer» D. P/2 | |