MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following capacitors preferred for high frequency circuits ? |
| A. | Air capacitor |
| B. | Electrolytic capacitor |
| C. | Mica capacitor |
| D. | none of the above |
| Answer» D. none of the above | |
| 2. |
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________? |
| A. | CIR |
| B. | 1/RC |
| C. | RC |
| D. | RIC |
| Answer» D. RIC | |
| 3. |
capacitors are mainly used for radio frequency tuning? |
| A. | Paper |
| B. | Air |
| C. | Mica |
| D. | Electrolytic |
| Answer» C. Mica | |
| 4. |
The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be______________? |
| A. | 400 N/C |
| B. | 600 N/C |
| C. | 800 N/C |
| D. | 1200 N/C |
| Answer» D. 1200 N/C | |
| 5. |
An electric field can deflect_______________? |
| A. | Neutrons |
| B. | X-rays |
| C. | Both glass rod and silk acquire a negative charge |
| D. | None |
| Answer» E. | |
| 6. |
In the case of a lossy capacitor, its series equivalent resistance value will be_______________? |
| A. | small |
| B. | very small |
| C. | large |
| D. | zero |
| Answer» D. zero | |
| 7. |
____________field is associated with the capacitor? |
| A. | Electric |
| B. | Magnetic |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» B. Magnetic | |
| 8. |
Equivalent capacitance is greater than individual capacitances in_____________? |
| A. | series combination |
| B. | parallel combination |
| C. | both series and parallel combinations |
| D. | none of above |
| Answer» C. both series and parallel combinations | |
| 9. |
If mica sheet is placed between the plates of a capacitor the capacity_______________? |
| A. | increases |
| B. | decreases |
| C. | increases then decreases |
| D. | decreases then increases |
| Answer» B. decreases | |
| 10. |
The electric lines of force are____________? |
| A. | imaginary |
| B. | physically existing every where |
| C. | physically existing near the charges |
| D. | depends upon case |
| Answer» B. physically existing every where | |
| 11. |
The minimum charge on any object cannot be less than_______________? |
| A. | 1.6 x 10-19C |
| B. | 3.2 x 10-19C |
| C. | 9.1 x 109C |
| D. | no definite value exist |
| Answer» B. 3.2 x 10-19C | |
| 12. |
If the distance between the two point charges become half then force between them becomes______________? |
| A. | double |
| B. | half |
| C. | four times |
| D. | remains same |
| Answer» D. remains same | |
| 13. |
Electric flux due to a point charge +q is______________? |
| A. | 1/4IIɛ q/r |
| B. | q/ɛ0 |
| C. | 1/4IIɛ0. q/r2 |
| D. | 4IIɛ0 |
| Answer» C. 1/4IIɛ0. q/r2 | |
| 14. |
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________? |
| A. | 1/4th of its original value |
| B. | 1/8th of its original value |
| C. | 4 times of its original value |
| D. | 8 times of its original value |
| Answer» D. 8 times of its original value | |
| 15. |
The electric charge of 100 °C is 13cm apart from another charge 16.9°C electric force between them is_____________? |
| A. | 9x107N |
| B. | 900N |
| C. | 9x105N |
| D. | 9x106N |
| Answer» C. 9x105N | |
| 16. |
Electric flux linked with a surface will be maximum when____________? |
| A. | The surface is held parallel to the electric field |
| B. | The surface is held perpendicular to the electric field |
| C. | The surface makes an angle of 45°with the field |
| D. | All of the above |
| Answer» C. The surface makes an angle of 45°with the field | |
| 17. |
If free space between the plates of a capacitor is replaced by a dielectric_____________? |
| A. | The potential difference remains constant capacittance and energy stored increases |
| B. | The potential difference remains constant capacittance decreases and energy increases |
| C. | The potential difference decreases but both capacitance and energy increase |
| D. | both potential difference and capacitance decrease but energy increases |
| Answer» D. both potential difference and capacitance decrease but energy increases | |
| 18. |
A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________? |
| A. | 900 volts |
| B. | 9000 volts |
| C. | 90 volts |
| D. | zero |
| Answer» C. 90 volts | |
| 19. |
Potential difference is the work done in moving unit positive charge form one point to another________________? |
| A. | in the direction of electric intensity |
| B. | against electric intensity |
| C. | in any direction |
| D. | in the direction of electric flux |
| Answer» C. in any direction | |
| 20. |
Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________? |
| A. | decrease |
| B. | increase |
| C. | remain constant |
| D. | depends upon composition of dielectric |
| Answer» B. increase | |
| 21. |
A paper capacitor is usually available in the form of_____________? |
| A. | tubes |
| B. | rolled foil |
| C. | disc |
| D. | meshed plates |
| Answer» C. disc | |
| 22. |
When we rub a glass rod with a silk cloth then________________? |
| A. | glass rod acquires negative charge while silk acquires positive charge |
| B. | glass rod acquires positive charge while silk acquires negative charges |
| C. | both glass rod and silk acquire negative charge |
| D. | both glass rod and silk acquire positive charge |
| Answer» C. both glass rod and silk acquire negative charge | |
| 23. |
A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ? |
| A. | Paper capacitor |
| B. | Ceramic capacitor |
| C. | Electrolytic capacitor |
| D. | Any-of the above |
| Answer» D. Any-of the above | |
| 24. |
The power dissipated in a pure capacitor is______________? |
| A. | zero |
| B. | proportional to applied voltage |
| C. | proportional to value of capacitance |
| D. | both (B) and (C) above |
| Answer» B. proportional to applied voltage | |
| 25. |
Which of the following capacitors is marked for polarity ? |
| A. | Air |
| B. | Paper |
| C. | Mica |
| D. | Electrolytic |
| Answer» E. | |
| 26. |
A capacitor consists of_____________? |
| A. | two insulators separated by a conductor |
| B. | two conductors separated by an insulator |
| C. | two insulators only |
| D. | two conductors only |
| Answer» C. two insulators only | |
| 27. |
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will______________? |
| A. | remain uncharged |
| B. | decrease |
| C. | increase |
| D. | become zero |
| Answer» C. increase | |
| 28. |
capacitor is to have an energy content of 20J it must be placed across a potential difference of________________? |
| A. | 4 volts |
| B. | 9 volts |
| C. | 2 volts |
| D. | 1 vol |
| Answer» D. 1 vol | |
| 29. |
Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________? |
| A. | positively charged |
| B. | electrically neutral |
| C. | negatively charged |
| D. | positively and negatively charged |
| Answer» C. negatively charged | |
| 30. |
A 25eV electron has a speed of______________? |
| A. | 2 x 106m/sec |
| B. | 3 x 106m/sec |
| C. | 5 x 106m/sec |
| D. | 4 x 106m/sec |
| Answer» C. 5 x 106m/sec | |
| 31. |
Equipotential planes are_______________? |
| A. | parallel to one another |
| B. | non parallel to one another |
| C. | intersecting |
| D. | circular |
| Answer» B. non parallel to one another | |
| 32. |
A 5 μF capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________? |
| A. | 2.5 x 10-8 C |
| B. | 10-5 C |
| C. | 103 C |
| D. | 4 x 103 C |
| Answer» C. 103 C | |
| 33. |
SI unit of the permittivity of free space is________________? |
| A. | Nm2C2 |
| B. | N-1mC-2 |
| C. | NmC-1 |
| D. | N-1m-2C2 |
| Answer» E. | |
| 34. |
The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8C. If the spheres are connected by a copper wire_______________? |
| A. | charge will flow from A to B |
| B. | charge will flow from B to A |
| C. | no flow of charge will occur |
| D. | both a and b are possible |
| Answer» B. charge will flow from B to A | |
| 35. |
The number of electrons in one coulomb charge is equal to_______________? |
| A. | 6.2 x 1018 |
| B. | 1.6 x 1019 |
| C. | 6.2 x 1021 |
| D. | 1.6 x 10-27 |
| Answer» B. 1.6 x 1019 | |
| 36. |
If two charges are increased by two times then force_____________? |
| A. | Decreases 9 times |
| B. | Increases 9 times |
| C. | Increases 4 times |
| D. | Decreases 4 times |
| Answer» D. Decreases 4 times | |
| 37. |
Which one of the following can be taken as the measure of electric intensity ? |
| A. | F/A |
| B. | V/A |
| C. | VF/A |
| D. | q/VA |
| Answer» C. VF/A | |
| 38. |
Value of εr for various dielectrics is always________________? |
| A. | Less than unity |
| B. | Equal to the unit |
| C. | Larger than unit |
| D. | No hard and fast rule |
| Answer» D. No hard and fast rule | |
| 39. |
N/C =_____________? |
| A. | V/A |
| B. | J/V |
| C. | V/m |
| D. | A/m |
| Answer» D. A/m | |
| 40. |
Photocopier and inject printer are dealt in________________? |
| A. | Electrostatics |
| B. | Charges in motion |
| C. | Capacitors |
| D. | Electric fields |
| Answer» B. Charges in motion | |
| 41. |
If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________? |
| A. | Spiral path |
| B. | Straight line |
| C. | Curved path |
| D. | Circular path |
| Answer» C. Curved path | |
| 42. |
A capacitor is a perfect insulator for______________? |
| A. | direct current |
| B. | alternating current |
| C. | both for the direct and alternating current |
| D. | none of above |
| Answer» B. alternating current | |
| 43. |
Selenium becomes a conductor in light so it behaves like____________? |
| A. | Semiconductor |
| B. | Photodiode |
| C. | Light emitting diode |
| D. | Capacitor |
| Answer» C. Light emitting diode | |
| 44. |
If metallic conductor is charged negatively then its weight______________? |
| A. | Remains same |
| B. | First increases then decreases |
| C. | Decreases then increases |
| D. | Increases for a while |
| Answer» E. | |
| 45. |
A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________? |
| A. | 200J |
| B. | 100J |
| C. | 1000J |
| D. | 100 eV |
| Answer» C. 1000J | |
| 46. |
In a charged capacitor the energy resides in________________? |
| A. | magnetic hield |
| B. | electric field |
| C. | nuclear field |
| D. | gravitational field |
| Answer» C. nuclear field | |
| 47. |
Electric intensity at infinite distance from the point charge is_____________? |
| A. | zero |
| B. | infinite |
| C. | positive |
| D. | negative |
| Answer» B. infinite | |
| 48. |
The force per unit charge is know as__________________? |
| A. | electric flux |
| B. | electric intensity |
| C. | electric potential |
| D. | all of above are same |
| Answer» C. electric potential | |
| 49. |
In a non-uniform electric field a polar molecule will experience____________? |
| A. | Net torque |
| B. | Net force |
| C. | both series and parallel combinations |
| D. | zero |
| Answer» D. zero | |
| 50. |
Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________? |
| A. | 9 x 109N |
| B. | 9.2 x 104N |
| C. | 9 x 109N |
| D. | 9 x 107N |
| Answer» B. 9.2 x 104N | |