MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the diffusion constant for the electrons when the mobility of the electrons is 325cm2/V-s and temperature is 300K? |
| A. | 0.85 m2/s |
| B. | 0.084 m2/s |
| C. | 0.58 m2/s |
| D. | 0.95 m2/s |
| Answer» D. 0.95 m2/s | |
| 2. |
Calculate the diffusion constant for the holes when the mobility of the holes is 400cm2/V-s and temperature is 300K? |
| A. | 1.035m m2/s |
| B. | 0.035m m2/s |
| C. | 1.5m m2/s |
| D. | 1.9m m2/s |
| Answer» B. 0.035m m2/s | |
| 3. |
Which of the following term isn’t a part of the total current density in a semiconductor? |
| A. | Temperature |
| B. | µ |
| C. | e |
| D. | E |
| Answer» B. µ | |
| 4. |
In diffusion, the particles flow from a region of _______ to region of ___________ |
| A. | High, low |
| B. | Low , high |
| C. | High , medium |
| D. | Low, medium |
| Answer» B. Low , high | |
| 5. |
Calculate the diffusion current density when the concentration of electron varies from the 1*1018 to 7*1017 cm-3 over a distance of 0.10 cm.D=225cm2/s |
| A. | 100 A/cm2 |
| B. | 108 A/cm2 |
| C. | 0.01A/cm2 |
| D. | None |
| Answer» C. 0.01A/cm2 | |
| 6. |
CALCULATE_THE_DIFFUSION_CONSTANT_FOR_THE_HOLES_WHEN_THE_MOBILITY_OF_THE_HOLES_IS_400CM2/V-S_AND_TEMPERATURE_IS_300K??$ |
| A. | 1.035m m<sup>2</sup>/s |
| B. | 0.035m m<sup>2</sup>/s |
| C. | 1.5m m<sup>2</sup>/s |
| D. | 1.9m m<sup>2</sup>/s |
| Answer» B. 0.035m m<sup>2</sup>/s | |
| 7. |
Calculate_the_diffusion_constant_for_the_electrons_when_the_mobility_of_the_electrons_is_325cm2/V-s_and_temperature_is_300K?$ |
| A. | 0.85 m<sup>2</sup>/s |
| B. | 0.084 m<sup>2</sup>/s |
| C. | 0.58 m<sup>2</sup>/s |
| D. | 0.95 m<sup>2</sup>/s |
| Answer» D. 0.95 m<sup>2</sup>/s | |
| 8. |
What does dn/dx represent? |
| A. | Velocity gradient |
| B. | Volume gradient |
| C. | Density gradient |
| D. | None |
| Answer» D. None | |
| 9. |
Which of the following term isn’t a part of the total current density in a semiconductor?$ |
| A. | Temperature |
| B. | µ |
| C. | e |
| D. | E |
| Answer» B. ¬¨¬®¬¨¬µ | |
| 10. |
Which of the following parameter describes the best movement of the electrons inside a semiconductor? |
| A. | Velocity gradient |
| B. | Diffusion |
| C. | Mobility |
| D. | Density gradient |
| Answer» D. Density gradient | |
| 11. |
In diffusion, the particles flow from a region of _______ to region of ___________ |
| A. | High, low |
| B. | Low , high |
| C. | High , medium |
| D. | Low, medium |
| Answer» B. Low , high | |
| 12. |
What is the direction of the electron diffusion current density relative to the electron flux? |
| A. | Same direction |
| B. | Opposite to each other |
| C. | Perpendicular to each other |
| D. | At 270 degrees to each other |
| Answer» C. Perpendicular to each other | |
| 13. |
Which is the correct formula for the Jp? |
| A. | Jp=qDdp/dx |
| B. | Jp=pDdn/dx |
| C. | Jp=-qDdp/dx |
| D. | None |
| Answer» D. None | |
| 14. |
Calculate the diffusion current density when the concentration of electron varies from the 1*1018 to 7*1017 cm-3 over a distance of 0.10 cm.D=225cm2/s |
| A. | 100 A/cm<sup>2</sup> |
| B. | 108 A/cm<sup>2</sup> |
| C. | 0.01A/cm<sup>2</sup> |
| D. | None |
| Answer» C. 0.01A/cm<sup>2</sup> | |
| 15. |
What is the SI unit of electron diffusion constant? |
| A. | cm<sup>2</sup>/s |
| B. | m<sup>2</sup>/s |
| C. | m/s |
| D. | none |
| Answer» C. m/s | |