MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
The relative dielectric constant of polystyrene is 2.5. What is the polarization produced when 0.5 mm thick sheet of polystyrene is subjected to 220 V? |
| A. | 2.78 X 10-6 C/m |
| B. | 3.91 X 10-6 C/m |
| C. | 4.12 X 10-6 C/m |
| D. | 5.84 X 10-6 C/m |
| Answer» E. | |
| 2. |
The expression for electric susceptibility is ___________ |
| A. | εoE |
| B. | εoEK |
| C. | εoE (K + 1) |
| D. | εoE (K – 1) |
| Answer» D. εoE (K – 1) | |
| 3. |
What is the new capacitance of the plates, when a slab of Dielectric Constant K and thickness one-fourth of the separation of plate is inserted between the plates? |
| A. | 4KCo/K + 2 |
| B. | 4KCo/1 + 2K |
| C. | 4KCo/K + 3 |
| D. | 4KCo/1 + 3K |
| Answer» E. | |
| 4. |
H2O is a polar dielectric. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
In the formula, P = χeE, what is χe called? |
| A. | Electric constant |
| B. | Polarizing constant |
| C. | Electric susceptibility |
| D. | Polarizing susceptibility |
| Answer» D. Polarizing susceptibility | |
| 6. |
What is the direction of electric field? |
| A. | Right to Left |
| B. | Up to Down |
| C. | Down to Up |
| D. | Left to Right |
| Answer» E. | |
| 7. |
In a water drop of radius 1 mm all the molecular dipole points are in the same direction. If the dipole moment of a water molecule is 6 X 10-30 m, the polarization in the water drop is ___________ |
| A. | 6.4 X 10-13 m-2 |
| B. | 7.4 X 10-13 m-2 |
| C. | 8.4 X 10-13 m-2 |
| D. | 9.4 X 10-13 m-2 |
| Answer» D. 9.4 X 10-13 m-2 | |
| 8. |
Polarization is defined as the dipole moment __________ |
| A. | per unit length |
| B. | per unit area |
| C. | per unit volume |
| D. | per unit time |
| Answer» D. per unit time | |
| 9. |
What is the value of 1 Debye in cm? |
| A. | 3.33 X 10-28 cm |
| B. | 3.33 X 10-30 cm |
| C. | 3.33 X 10-32 cm |
| D. | 3.33 X 10-34 cm |
| Answer» C. 3.33 X 10-32 cm | |
| 10. |
The dipole is most stable when the angle between the dipole and the field is __________ |
| A. | 0° |
| B. | 45° |
| C. | 90° |
| D. | 180° |
| Answer» B. 45° | |
| 11. |
The torque induced on a dipole when placed in an electric field E is given by _________ |
| A. | Esinθ |
| B. | pEsinθ |
| C. | Ecosθ |
| D. | pEcosθ |
| Answer» C. Ecosθ | |
| 12. |
CO2 is a polar dielectric. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Dipoles are created when dielectric is placed in __________ |
| A. | Magnetic Field |
| B. | Electric field |
| C. | Vacuum |
| D. | Inert Environment |
| Answer» C. Vacuum | |
| 14. |
The forbidden energy gap of dielectrics is __________ |
| A. | Less than 1.2 eV |
| B. | Greater than or equal to 1.2 eV |
| C. | Less than 3 eV |
| D. | Greater than or equal to 3 eV |
| Answer» E. | |