MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
Find the capacitance of layer of A12 O3 that is 0.5 m thick and 2000mm2 of square area r = 8. |
| A. | 1000 F |
| B. | 0.283 F |
| C. | 16 F |
| D. | 2.83 F |
| Answer» C. 16 F | |
| 2. |
Calculate the dielectric constant of a material which when inserted in parallel condenser of area 10mm 10mm and distance of separation of 2mm, gives a capacitance of 10-9 F. |
| A. | 8.854 10<sup>-12</sup> |
| B. | 100 |
| C. | 2259 |
| D. | 5354 |
| Answer» D. 5354 | |
| 3. |
Calculate the electronic polarizability of an argon atom whose r = 1.0024 at NTP and N = 2.7 1025 atoms/m3. |
| A. | 0.0024 Fm<sup>2</sup> |
| B. | 7.87 10<sup>-40</sup> Fm<sup>2</sup> |
| C. | 7.87 Fm<sup>2</sup> |
| D. | 1.0024 10<sup>-40</sup> Fm<sup>2</sup> |
| Answer» C. 7.87 Fm<sup>2</sup> | |
| 4. |
Which of the following materials exhibit Ferro-electricity? |
| A. | Iron |
| B. | Platinum |
| C. | Hydrogen |
| D. | Rochelle salt |
| Answer» E. | |
| 5. |
When mobility increases, insulation resistance decreases and dielectric becomes conducting. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Which of the following breakdowns occur at a higher temperature? |
| A. | Avalanche breakdown |
| B. | Thermal breakdown |
| C. | Electrochemical breakdown |
| D. | Dielectric breakdown |
| Answer» C. Electrochemical breakdown | |
| 7. |
When does a dielectric become a conductor? |
| A. | At avalanche breakdown |
| B. | At high temperature |
| C. | At dielectric breakdown |
| D. | In the presence of magnetic field |
| Answer» D. In the presence of magnetic field | |
| 8. |
Which of the following is the slowest polarisation method? |
| A. | Ionic polarisation |
| B. | Orientation polarisation |
| C. | Electronic polarisation |
| D. | Space charge polarisation |
| Answer» E. | |
| 9. |
Which of the following polarisations is very rapid? |
| A. | Electronic polarisation |
| B. | Ionic polarisation |
| C. | Space charge polarisation |
| D. | Orientation polarisation |
| Answer» B. Ionic polarisation | |