MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
If the number of electrons (majority carrier) in a semiconductor is 5 X 1020 m-3 and e is 0.135 mho, find the resistivity of the semiconductor. |
| A. | 0.0926 m |
| B. | 0.0945 m |
| C. | 0.0912 m |
| D. | 0.0978 m |
| Answer» B. 0.0945 m | |
| 2. |
Holes are the majority carries in Intrinsic Semiconductors. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
In a semiconductor it is observed that three-quarters of the current is carried by electrons and one quarters by holes. If the drift speed is three times that of the holes, what is the ratio of electrons to holes? |
| A. | 1 : 1 |
| B. | 1 : 2 |
| C. | 2 : 1 |
| D. | 4 : 1 |
| Answer» B. 1 : 2 | |
| 4. |
Pure Si at 300 K has equal electron (ni) and hole concentration (p) of 1.5 X 1016 m-3. Doping by indium increases p to 4.5 X 1022 m-3. What is n in the doped silicon? |
| A. | 4.5 X 10<sup>9</sup> m<sup>-3</sup> |
| B. | 4.5 X 10<sup>22</sup> m<sup>-3</sup> |
| C. | 5 X 10<sup>9</sup> m<sup>-3</sup> |
| D. | 5 X 10<sup>22</sup> m<sup>-3</sup> |
| Answer» D. 5 X 10<sup>22</sup> m<sup>-3</sup> | |
| 5. |
P-Type semiconductor has a lower electrical conductivity than N-Type semiconductor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Which of the following is n-type semiconductor? |
| A. | CaO |
| B. | MgO |
| C. | ZnO |
| D. | BaO |
| Answer» D. BaO | |
| 7. |
Which one of the following is not an intrinsic semiconductor? |
| A. | Carbon |
| B. | Silicon |
| C. | Germanium |
| D. | Lead |
| Answer» B. Silicon | |
| 8. |
The Hall coefficient of a specimen is 3.66 x 10-4 m3C-1. If it s resistivity is 8.93 x 10-3 m, what will be its mobility? |
| A. | 0.01 m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| B. | 0.02 m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| C. | 0.03 m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| D. | 0.04 m<sup>2</sup>V<sup>-1</sup>s<sup>-1</sup> |
| Answer» E. | |
| 9. |
Which of the following can be used to create a P-Type Semiconductor? |
| A. | P |
| B. | Sb |
| C. | Ga |
| D. | As |
| Answer» D. As | |
| 10. |
In N-Type semiconductors, which extra energy level is added? |
| A. | Conduction level |
| B. | Donor Energy Level |
| C. | Acceptor energy level |
| D. | Valence level |
| Answer» C. Acceptor energy level | |
| 11. |
The concentration of doping is kept below ______________ |
| A. | 1 % |
| B. | 5 % |
| C. | 10 % |
| D. | 50 % |
| Answer» B. 5 % | |
| 12. |
What are the current carriers in semiconductors? |
| A. | Electrons and Protons |
| B. | Electrons and Nucleons |
| C. | Electrons and Photons |
| D. | Electrons and Holes |
| Answer» E. | |
| 13. |
What is the energy level below which all levels are completely occupied at Zero Kelvin called? |
| A. | Boson Energy |
| B. | Fermi Energy |
| C. | Stable Energy |
| D. | Ground Energy |
| Answer» C. Stable Energy | |