MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which, among the following, do not have any unit? |
| A. | Absolute permittivity |
| B. | Relative permittivity |
| C. | Actual permittivity |
| D. | Both absolute and relative permittivity |
| Answer» C. Actual permittivity | |
| 2. |
When will be capacitors fully charged? |
| A. | When voltage is zero |
| B. | When the supply voltage is equal to the capacitor voltage |
| C. | When voltage is infinity |
| D. | When capacitor voltage is equal to half the supply voltage |
| Answer» C. When voltage is infinity | |
| 3. |
Calculate the number of plates in the multi plate capacitor having C=1.77*10¯¹⁰F relative permittivity=5, A=4m² and d=2m. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 4. |
Which, among the following, is the correct expression for electric flux density? |
| A. | D=epsilon*E |
| B. | D=epsilon/E |
| C. | D²=epsilon*E |
| D. | D=epsilon*E² |
| Answer» B. D=epsilon/E | |
| 5. |
Which, among the following is the correct expression for an electric field? |
| A. | E=F/C |
| B. | E=F*C |
| C. | E=F/Q |
| D. | E=F*Q |
| Answer» D. E=F*Q | |
| 6. |
Magnetic fields between the parallel plates of a capacitor are due to? |
| A. | Displacement current |
| B. | Conduction current |
| C. | Both conduction and displacement current |
| D. | Neither conduction nor displacement current |
| Answer» B. Conduction current | |
| 7. |
Which, among the following, is the field where electric charge experiences a force? |
| A. | Electric field |
| B. | Magnetic field |
| C. | Gravitational field |
| D. | Electric, magnetic and gravitational field |
| Answer» B. Magnetic field | |
| 8. |
The free electrons in practical dielectrics are due to ________ |
| A. | There are no free electrons |
| B. | Conductors |
| C. | Impurities |
| D. | Displacement currents |
| Answer» D. Displacement currents | |
| 9. |
The type of capacitors used in communication transmitters are? |
| A. | Electrolyte capacitor |
| B. | Variable capacitor |
| C. | Air capacitor |
| D. | Glass capacitor |
| Answer» C. Air capacitor | |
| 10. |
A circuit has a resistance of 2 ohm connected in series with a capacitance of 6F. Calculate the charging time constant. |
| A. | 3 |
| B. | 1 |
| C. | 12 |
| D. | 8 |
| Answer» D. 8 | |
| 11. |
The conventional direction of electric field is ________ |
| A. | Positive to negative |
| B. | Negative to positive |
| C. | No specific direction |
| D. | Direction cannot be determined |
| Answer» B. Negative to positive | |
| 12. |
The current in conductors connecting the voltage source to the plates of a capacitor is _______ |
| A. | Conduction current |
| B. | Leakage current |
| C. | Charging current |
| D. | Displacement current |
| Answer» D. Displacement current | |
| 13. |
What happens to the capacitor when the capacitor voltage is equal to the source voltage? |
| A. | The charging phase of the capacitor is over |
| B. | The discharging phase of the capacitor is over |
| C. | The capacitor is switched off |
| D. | The capacitor is switched on |
| Answer» D. The capacitor is switched on | |
| 14. |
When capacitors are connected in series, the equivalent capacitance is ___________ each individual capacitance. |
| A. | Greater than |
| B. | Less then |
| C. | Equal to |
| D. | Insufficient data provided |
| Answer» C. Equal to | |
| 15. |
As area increases, what happens to electric flux density? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 16. |
When capacitors are connected in series, which of the following rules are applied? |
| A. | Voltage divider |
| B. | Current divider |
| C. | Both voltage divider and current divider |
| D. | Neither voltage divider nor current divider |
| Answer» B. Current divider | |
| 17. |
If the Voltage increases, what happens to dielectric strength? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 18. |
When capacitors are connected in parallel, what happens to the effective plate area? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 19. |
Strength of the electric field is ___________ |
| A. | Directly proportional to the force applied |
| B. | Inversely proportional to the force applied |
| C. | Directly proportional to the square of the force applied |
| D. | Inversely proportional to the square of the force applied |
| Answer» B. Inversely proportional to the force applied | |
| 20. |
Find the capacitance of a capacitor whose area of cross section of the plates is 4m² and distance of separation between the plates is 2m. The capacitor is placed in vacuum. |
| A. | 1.77*10¯¹¹F |
| B. | 1.34*10¯¹¹F |
| C. | 2.33*10¯¹¹F |
| D. | 5.65*10¯¹¹F |
| Answer» B. 1.34*10¯¹¹F | |
| 21. |
If the charge stored in a capacitor is 4C and the value of capacitance is 2F, calculate the energy stored in it. |
| A. | 2J |
| B. | 4J |
| C. | 8J |
| D. | 16J |
| Answer» C. 8J | |
| 22. |
What is the unit for relative permittivity? |
| A. | F/m |
| B. | Fm |
| C. | F/m² |
| D. | No unit |
| Answer» E. | |
| 23. |
The flow of electrons which does not pass through the battery is known as ________ |
| A. | Displacement current |
| B. | Leakage current |
| C. | Either displacement or leakage current |
| D. | Neither displacement nor leakage current |
| Answer» B. Leakage current | |
| 24. |
The force applied to a conductor is 10N if the charge in the conductor is 5C, what is the electric field intensity? |
| A. | 10V/m |
| B. | 2V/m |
| C. | 3V/m |
| D. | 15V/m |
| Answer» C. 3V/m | |
| 25. |
Capacitor preferred when there is high frequency in the circuits is _______ |
| A. | Electrolyte capacitor |
| B. | Mica capacitor |
| C. | Air capacitor |
| D. | Glass capacitor |
| Answer» C. Air capacitor | |
| 26. |
When do we get maximum energy from a set of capacitors? |
| A. | When they are connected in parallel |
| B. | When they are connected in series |
| C. | Both in series and parallel |
| D. | Insufficient information provided |
| Answer» B. When they are connected in series | |
| 27. |
What is the conduction current when a capacitor is fully charged? |
| A. | Infinity |
| B. | Zero |
| C. | 100A |
| D. | 1000A |
| Answer» C. 100A | |
| 28. |
When capacitors are connected in parallel, the total capacitance is always __________ the individual capacitance values. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Cannot be determined |
| Answer» B. Less than | |
| 29. |
An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the voltage in the capacitor 4s after the power is supplied. |
| A. | 123.4V |
| B. | 126.4V |
| C. | 124.5V |
| D. | 132.5V |
| Answer» C. 124.5V | |
| 30. |
Electric flux density is a function of_______ |
| A. | Volume |
| B. | Charge |
| C. | Current |
| D. | Voltage |
| Answer» C. Current | |
| 31. |
Find the capacitance of a multi plate capacitor whose actual permittivity= 5F/m, n=3, A=4m²and d=2m. |
| A. | 10F |
| B. | 20F |
| C. | 30F |
| D. | 40F |
| Answer» C. 30F | |
| 32. |
What is the total capacitance when two capacitors C1 and C2 are connected in series? |
| A. | (C1+C2)/C1C2 |
| B. | 1/C1+1/C2 |
| C. | C1C2/(C1+C2) |
| D. | C1+C2 |
| Answer» D. C1+C2 | |
| 33. |
What is the relative permittivity when the actual permittivity is 4F/m? |
| A. | 4.57*10¯¹¹ |
| B. | 4.57*10¹² |
| C. | 4.57*10¹¹ |
| D. | 4.57*10¯¹² |
| Answer» D. 4.57*10¯¹² | |
| 34. |
When capacitors are connected in series _______________ Varies. |
| A. | Voltage across each capacitor |
| B. | Charge |
| C. | Capacitance |
| D. | Resistance |
| Answer» B. Charge | |
| 35. |
If the charge in a capacitor is 4C and the energy stored in it is 4J, calculate the voltage across its plates. |
| A. | 2V |
| B. | 4V |
| C. | 8V |
| D. | 16V |
| Answer» B. 4V | |
| 36. |
A metal parallel plate capacitor has 100mm diameter and the distance between the plates is ‘a’ mm. The capacitor is placed in air. Force on each plate is 0.035N and the potential difference between the plates is 1kV. Find ‘a’. |
| A. | 1m |
| B. | 1cm |
| C. | 10cm |
| D. | 1mm |
| Answer» E. | |
| 37. |
The thickness of a material having dielectric strength 10MV/m is 5m, calculate the potential difference. |
| A. | 2MV |
| B. | 10MV |
| C. | 50MV |
| D. | 100MV |
| Answer» D. 100MV | |
| 38. |
What is the total capacitance when three capacitors, C1, C2 and C3 are connected in parallel? |
| A. | C1/(C2+C3) |
| B. | C1+C2+C3 |
| C. | C2/(C1+C3) |
| D. | 1/C1+1/C2+1/C3 |
| Answer» C. C2/(C1+C3) | |
| 39. |
Air has a dielectric constant of ___________ |
| A. | Unity |
| B. | Zero |
| C. | Infinity |
| D. | Hundred |
| Answer» B. Zero | |
| 40. |
What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge? |
| A. | 2F |
| B. | 4F |
| C. | 6F |
| D. | 8F |
| Answer» B. 4F | |
| 41. |
Unit of capacitance is___________ |
| A. | Volts |
| B. | Farad |
| C. | Henry |
| D. | Newton |
| Answer» C. Henry | |
| 42. |
What happens to the potential drop between the two plates of a capacitor when a dielectric is introduced between the plates? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 43. |
What happens to relative permittivity when actual permittivity decreases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 44. |
If the potential difference across the plates of a capacitor is 10V and a dielectric having thickness 2m is introduced between the plates, calculate the potential difference after introducing the dielectric. The electric field strength is 2V/m. |
| A. | 4V |
| B. | 6V |
| C. | 8V |
| D. | 10V |
| Answer» C. 8V | |
| 45. |
As charge increases, what happens to flux density? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 46. |
Work done in charging a capacitor is ____________ |
| A. | QV |
| B. | 1⁄2QV |
| C. | 2QV |
| D. | QV² |
| Answer» C. 2QV | |
| 47. |
What happens to the capacitance when a dielectric is introduced between its plates? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 48. |
Which, among the following, is the odd one out? |
| A. | Ceramic capacitor |
| B. | Electrolyte capacitor |
| C. | Tuning capacitor |
| D. | Paper capacitor |
| Answer» D. Paper capacitor | |
| 49. |
A field that spreads outwards in all directions is __________ |
| A. | Linear |
| B. | Radial |
| C. | Weak |
| D. | Strong |
| Answer» C. Weak | |
| 50. |
A 4microF capacitor is charged to 120V, the charge in the capacitor would be? |
| A. | 480C |
| B. | 480microC |
| C. | 30C |
| D. | 30microC |
| Answer» C. 30C | |