MCQOPTIONS
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MCQOPTIONS
This section includes 14 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 Fermi temperature of a metal is 24600K. Calculate the Fermi velocity. |
| A. | 0.5m/s |
| B. | 1.38m/s |
| C. | 0.8633×106m/s |
| D. | 9.11×10-3m/s |
| Answer» D. 9.11×10-3m/s | |
| 2. |
Calculate the drift velocity of the free electrons with mobility of 3.5×10-3 m2/Vs in copper for an electric field strength of 0.5 V/m. |
| A. | 3.5 m/s |
| B. | 1.75×103 m/s |
| C. | 11.5 m/s |
| D. | 1.75×10-3 m/s |
| Answer» E. | |
| 3. |
A uniform silver wire has a resistivity of 1.54×10-18 ohm/m at room temperature. For an electric field along the wire of 1 volt/cm. Compute the mobility, assuming that there are 5.8×1028 conduction electrons/m3. |
| A. | 1.54 m2/Vs |
| B. | 6.9973m2/Vs |
| C. | 6.9973×10-3 m2/Vs |
| D. | 0.69973m/s |
| Answer» D. 0.69973m/s | |
| 4. |
The free electrons collide with the lattice elastically. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
CALCULATE_THE_DRIFT_VELOCITY_OF_THE_FREE_ELECTRONS_WITH_MOBILITY_OF_3.5‚ÄÖ√†√∂‚Àւ•10-3_M2/VS_IN_COPPER_FOR_AN_ELECTRIC_FIELD_STRENGTH_OF_0.5_V/M.?$# |
| A. | 3.5 m/s |
| B. | 1.75√ó10<sup>3</sup> m/s |
| C. | 11.5 m/s |
| D. | 1.75√ó10<sup>-3</sup> m/s |
| Answer» E. | |
| 6. |
The_Fermi_temperature_of_a_metal_is_24600K._Calculate_the_Fermi_velocity.$ |
| A. | 0.5m/s |
| B. | 1.38m/s |
| C. | 0.8633√ó10<sup>6</sup>m/s |
| D. | 9.11√ó10<sup>-3</sup>m/s |
| Answer» D. 9.11‚Äö√†√∂‚àö‚â•10<sup>-3</sup>m/s | |
| 7. |
A uniform silver wire has a resistivity of 1.54√ó10-18 ohm/m at room temperature. For an electric field along the wire of 1 volt/cm. Compute the mobility, assuming that there are 5.8√ó1028 conduction electrons/m3?# |
| A. | 1.54 m<sup>2</sup>/Vs |
| B. | 6.9973m<sup>2</sup>/Vs |
| C. | 6.9973√ó10<sup>-3</sup> m<sup>2</sup>/Vs |
| D. | 0.69973m/s |
| Answer» D. 0.69973m/s | |
| 8. |
What is the level that acts as a reference which separated the vacant and filled states at 0K? |
| A. | Excited level |
| B. | Ground level |
| C. | Valance orbit |
| D. | Fermi energy level |
| Answer» E. | |
| 9. |
Which of the following theories can be adopted to rectify the drawbacks of classical theory? |
| A. | Compton theory |
| B. | Quantum theory |
| C. | Band theory |
| D. | Electron theory |
| Answer» C. Band theory | |
| 10. |
Which of the following theories cannot be explained by classical theory? |
| A. | Electron theory |
| B. | Lorentz theory |
| C. | Photo-electric effect |
| D. | Classical free electron theory |
| Answer» D. Classical free electron theory | |
| 11. |
Thermal conductivity is due to photons. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
What happens to the free electrons when an electric field is applied? |
| A. | They move randomly and collide with each other |
| B. | They move in the direction of the field |
| C. | They remain stable |
| D. | They move in the direction opposite to that of the field |
| Answer» E. | |
| 13. |
The free electrons collide with the lattice elastically. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
What does the conductivity of metals depend upon? |
| A. | The nature of the material |
| B. | Number of free electrons |
| C. | Resistance of the metal |
| D. | Number of electrons |
| Answer» C. Resistance of the metal | |