MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
In which of the following semiconductor, the concentration of the holes and electrons is equal? |
| A. | Intrinsic |
| B. | Extrinsic |
| C. | Compound |
| D. | Elemental |
| Answer» B. Extrinsic | |
| 2. |
The thermal equilibrium concentration of the electrons in the conduction band and the holes in the valence band depends upon? |
| A. | Effective density of states |
| B. | Fermi energy level |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 3. |
THE_THERMAL_EQUILIBRIUM_CONCENTRATION_OF_THE_ELECTRONS_IN_THE_CONDUCTION_BAND_AND_THE_HOLES_IN_THE_VALENCE_BAND_DEPENDS_UPON??$ |
| A. | Effective density of states |
| B. | Fermi energy level |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 4. |
In_which_of_the_following_semiconductor,_the_concentration_of_the_holes_and_electrons_is_equal?$ |
| A. | Intrinsic |
| B. | Extrinsic |
| C. | Compound |
| D. | Elemental |
| Answer» B. Extrinsic | |
| 5. |
What is the difference between the practical value and theoretical value of ni? |
| A. | Factor of 1 |
| B. | Factor of 2 |
| C. | Factor of 3 |
| D. | Factor of 4 |
| Answer» C. Factor of 3 | |
| 6. |
The intrinsic Fermi level of a semiconductor depends on which of the following things? |
| A. | E<sub>midgap</sub> |
| B. | m<sub>p</sub><sup>*</sup> |
| C. | m<sub>n</sub><sup>*</sup> |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
What is the intrinsic electrons concentration at T=300K in Silicon? |
| A. | 1.5*10<sup>10</sup>cm<sup>-3</sup> |
| B. | 1.5*10<sup>-10</sup>cm<sup>-3</sup> |
| C. | 2.5*10<sup>19</sup>cm<sup>-3</sup> |
| D. | 2.5*10<sup>-19</sup>cm<sup>-3</sup> |
| Answer» B. 1.5*10<sup>-10</sup>cm<sup>-3</sup> | |
| 8. |
Electrons from valence band rises to conduction band when the temperature is greater than 0 k. Is it True or False? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which of the following expressions represent the Fermi probability function? |
| A. | fF(E)=exp(-[E-EF]/KT) |
| B. | fF(E)=exp(-[EF-E]/KT) |
| C. | fF(E)=exp([E-EF]/KT) |
| D. | fF(E)=exp(-[EF-E]/KT) |
| Answer» C. fF(E)=exp([E-EF]/KT) | |
| 10. |
In a semiconductor which of the following carries can contribute to the current? |
| A. | Electrons |
| B. | Holes |
| C. | Both |
| D. | None |
| Answer» D. None | |
| 11. |
What is the value of the effective density of states function in the conduction band at 300k? |
| A. | 3*10<sup>19</sup> cm<sup>-3</sup> |
| B. | 0.4*10<sup>-19</sup> cm<sup>-3</sup> |
| C. | 2.5*10<sup>19</sup> cm<sup>-3</sup> |
| D. | 2.5*10<sup>-19</sup> cm<sup>-3</sup> |
| Answer» D. 2.5*10<sup>-19</sup> cm<sup>-3</sup> | |
| 12. |
Which of the following expressions represents the correct distribution of the electrons in the conduction band? (gc(E)=density of quantum states, fF(E)=Fermi dirac probability |
| A. | n(E)=gc(E)*fF(E) |
| B. | n(E)=gc(-E)*fF(E) |
| C. | n(E)=gc(E)*fF(-E) |
| D. | n(E)= gc(-E)*fF(-E) |
| Answer» B. n(E)=gc(-E)*fF(E) | |