MCQOPTIONS
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MCQOPTIONS
This section includes 24 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 0.5μm thick and 2000mm2 of square area εr = 8. |
| A. | 1000μF |
| B. | 0.283μF |
| C. | 16μF |
| D. | 2.83μF |
| Answer» C. 16μF | |
| 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. | 8.854×10-12 |
| B. | 100 |
| C. | 2259 |
| D. | 5354 |
| Answer» D. 5354 | |
| 3. |
Calculate the electronic polarizability of an argon atom whose ɛr = 1.0024 at NTP and N = 2.7×1025 atoms/m3. |
| A. | 0.0024 Fm2 |
| B. | 7.87 ×10-40 Fm2 |
| C. | 7.87 Fm2 |
| D. | 1.0024×10-40 Fm2 |
| Answer» C. 7.87 Fm2 | |
| 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 | |
| 10. |
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 | |
| 11. |
When mobility increases, insulation resistance decreases and dielectric becomes conducting. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
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 | |
| 13. |
Find the capacitance of layer of A13 O3 that is 0.5μm thick and 2000mm2 of square area εr = 8.$ |
| A. | 1000μF |
| B. | 0.283μF |
| C. | 16μF |
| D. | 2.83μF |
| Answer» C. 16‚âà√≠¬¨‚à´F | |
| 14. |
Calculate the dielectric constant of a material which when inserted in parallel condenser of area 10mm √ó 10mm and distance of separation of 2mm, gives a capacitance of 10-9 F.$ |
| A. | 8.854√ó10<sup>-12</sup> |
| B. | 100 |
| C. | 2259 |
| D. | 5354 |
| Answer» D. 5354 | |
| 15. |
Calculate the electronic polarizability of an argon atom whose …õr = 1.0024 at NTP and N = 2.7√ó1025 atoms/m3.$ |
| A. | 0.0024 Fm<sup>2</sup> |
| B. | 7.87 √ó10<sup>-40</sup> Fm<sup>2</sup> |
| C. | 7.87 Fm<sup>2</sup> |
| D. | 1.0024√ó10<sup>-40</sup> Fm<sup>2</sup> |
| Answer» C. 7.87 Fm<sup>2</sup> | |
| 16. |
Which of the following materials exhibit Ferro-electricity? |
| A. | Iron |
| B. | Platinum |
| C. | Hydrogen |
| D. | Rochelle salt |
| Answer» E. | |
| 17. |
Which of the following is the slowest polarisation method? |
| A. | Ionic polarisation |
| B. | Orientation polarisation |
| C. | Electronic polarisation |
| D. | Space charge polarisation |
| Answer» E. | |
| 18. |
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 | |
| 19. |
Polar molecules have permanent dipole moments even in the absence of an electric field. |
| A. | False |
| B. | True |
| Answer» C. | |
| 20. |
How does ionic polarisation occur? |
| A. | Splitting of ions |
| B. | Passing magnetic field |
| C. | Displacement of cations and anions |
| D. | Never occurs |
| Answer» D. Never occurs | |
| 21. |
For non-polar molecules, there is no absorption or emission in the range of infrared. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Which of the following restricts the flow of electrical energy? |
| A. | Superconductors |
| B. | Passive dielectrics |
| C. | Polar molecules |
| D. | Active dielectric |
| Answer» C. Polar molecules | |
| 23. |
Which of the following easily adapt itself to store electrical energy? |
| A. | Passive dielectric |
| B. | Superconductor |
| C. | Active dielectric |
| D. | Polar molecules |
| Answer» D. Polar molecules | |
| 24. |
What is the process of producing electric dipoles inside the dielectric by an external electric field? |
| A. | Polarisation |
| B. | Dipole moment |
| C. | Susceptibility |
| D. | Magnetisation |
| Answer» B. Dipole moment | |