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. |
A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is |
| A. | 62 x 105 V/m |
| B. | 72 x 105 V/m |
| C. | 82 x 105 V/m |
| D. | 92 x 105 V/m |
| Answer» C. 82 x 105 V/m | |
| 2. |
The capacitance of a capacitor is not affected by |
| A. | distance between plates |
| B. | area of plates |
| C. | thickness of plates |
| D. | all of the above |
| Answer» D. all of the above | |
| 3. |
Paper condenser is |
| A. | always polarised |
| B. | usually of fixed value |
| C. | electrolytic condenser |
| D. | a variable condenser |
| Answer» C. electrolytic condenser | |
| 4. |
Paper capacitors usually have a tolerance of |
| A. | ± 5% |
| B. | ± 10% |
| C. | ± 15% |
| D. | ± 20% |
| Answer» C. ± 15% | |
| 5. |
A gang condenser is a |
| A. | polarised capacitor |
| B. | variable capacitor |
| C. | ceramic capacitor |
| D. | none of the above |
| Answer» C. ceramic capacitor | |
| 6. |
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 | |
| 7. |
1 volt/meter is same as |
| A. | 1 meter/coulomb |
| B. | 1 newton meter |
| C. | 1 newton/meter |
| D. | 1 joule/coulomb |
| Answer» D. 1 joule/coulomb | |
| 8. |
A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is |
| A. | 100 kV/m |
| B. | 10 kV/m |
| C. | 5 kV/m |
| D. | 2 kV/m |
| Answer» B. 10 kV/m | |
| 9. |
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is |
| A. | 0.2 s |
| B. | 0.4 s |
| C. | 0.6 s |
| D. | 0.8 s |
| Answer» E. | |
| 10. |
The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be |
| A. | 36 x 10 fa |
| B. | 36 x 107 N |
| C. | 36 x 108 N |
| D. | 36 x 109 N |
| Answer» E. | |
| 11. |
For a good 0.05 uF capacitor ohmmeter reading should |
| A. | show low resistance momentarily and back off to a very high resistance |
| B. | show high resistance momentarily and then a very low resistance |
| C. | go quickly to 50 ohm approximately and remain there |
| D. | not move at all |
| Answer» B. show high resistance momentarily and then a very low resistance | |
| 12. |
Out of the following capacitors of identical rating which one will have the smallest dimensions ? |
| A. | Aluminium foil capacitor |
| B. | Mica capacitor |
| C. | Ceramic capacitor |
| D. | Paper capacitor |
| Answer» D. Paper capacitor | |
| 13. |
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ? |
| A. | Ceramic capacitor |
| B. | Mica capacitor |
| C. | Both will have identical value of capacitance |
| D. | It depends on applied voltage |
| Answer» B. Mica capacitor | |
| 14. |
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 | |
| 15. |
The capacitance between two plates increases with |
| A. | shorter plate area and higher applied voltage |
| B. | shorter plate area and shorter distance between them |
| C. | larger plate area, longer distance between plates and higher,applied voltage |
| D. | larger plate area and shorter distance between plates |
| Answer» E. | |
| 16. |
An electrolytic capacitor can be used for |
| A. | D.C. only |
| B. | AC. only |
| C. | both D.C. as well as A.C. |
| D. | none of the above |
| Answer» B. AC. only | |
| 17. |
The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value, |
| A. | 37 |
| B. | 42 |
| C. | 63 |
| D. | 73 |
| Answer» B. 42 | |
| 18. |
If a third equal and similar charge is placed between two equal and similar charges, then this third charge will |
| A. | move out of the field of influence of the two charges |
| B. | remain in stable equilibrium |
| C. | not be in equilibrium |
| D. | be in unstable equilibrium |
| Answer» C. not be in equilibrium | |
| 19. |
capacitors are mainly used for radio frequency tuning. |
| A. | Paper |
| B. | Air |
| C. | Mica |
| D. | Electrolytic |
| Answer» C. Mica | |
| 20. |
Dielectric strength ______ with increasing thickness |
| A. | increases |
| B. | decreases |
| C. | remains unaltered |
| D. | none of the above |
| Answer» C. remains unaltered | |
| 21. |
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 22. |
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is |
| A. | Short-circuited |
| B. | Open circuited |
| C. | Alright |
| D. | Leaky |
| Answer» E. | |
| 23. |
The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as |
| A. | Photoelectric effect |
| B. | Chemical effect |
| C. | Magnetic effect |
| D. | Induction |
| Answer» E. | |
| 24. |
The potential gradient across the material of low permittivity is than across the material of high permittivity. |
| A. | smaller |
| B. | greater |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 25. |
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value. |
| A. | 37, initial |
| B. | 62, initial |
| C. | 62, final |
| D. | 37, final |
| Answer» D. 37, final | |
| 26. |
The relative permittivity of free space is given by |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 27. |
The absolute permittivity of free space is given by |
| A. | 8.854 x 1(T9 F/m) |
| B. | 8.854 x 1(T10 F/m) |
| C. | 8.854 x KT11 F/m |
| D. | 8.854 x 10?12 F/m |
| Answer» C. 8.854 x KT11 F/m | |
| 28. |
The presence of an uncharged conductor near a charged one increases the |
| A. | charge of the charged conductor |
| B. | capacity of the charged conductor |
| C. | potential of the charged conductor |
| D. | all of the above |
| Answer» C. potential of the charged conductor | |
| 29. |
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the |
| A. | Voltage across the plates increases |
| B. | Voltage across the plates decreases |
| C. | Charge on the capacitor decreases |
| D. | Charge on the capacitor increases |
| Answer» C. Charge on the capacitor decreases | |
| 30. |
capacitors can be used only for D.C. |
| A. | Air |
| B. | Paper |
| C. | Mica |
| D. | Electrolytic |
| Answer» E. | |
| 31. |
If three 15 uF capacitors are connected in series, the net capacitance is |
| A. | 5 uF |
| B. | 30 uF |
| C. | 45 uF |
| D. | 50 uF |
| Answer» B. 30 uF | |
| 32. |
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ? |
| A. | It will become magnetic |
| B. | It will melt |
| C. | It will get punctured or cracked |
| D. | Its molecular structure will get changed |
| Answer» D. Its molecular structure will get changed | |
| 33. |
The sparking between two electrical contacts can be reduced by inserting a |
| A. | capacitor in parallel with contacts |
| B. | capacitor in series with each contact |
| C. | resistance in line |
| D. | none of the above |
| Answer» B. capacitor in series with each contact | |
| 34. |
at a point is equal to the negative potential gradient at that point. |
| A. | Electric intensity |
| B. | Electric flux |
| C. | Magnetic flux |
| D. | Magnetic flux density |
| Answer» B. Electric flux | |
| 35. |
A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be |
| A. | 10 F |
| B. | 10 uF |
| C. | 100 nF |
| D. | 1000 uF |
| Answer» C. 100 nF | |
| 36. |
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 | |
| 37. |
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 | |
| 38. |
On a dry day if we walk in a carpeted room and then touch some conductor we will fell |
| A. | heat |
| B. | small electric shock |
| C. | large electric shock |
| D. | light |
| Answer» C. large electric shock | |
| 39. |
To store large amount of charge at relatively low voltage, we use |
| A. | ceramic capacitors |
| B. | fixed capacitors |
| C. | parallel plate capacitors |
| D. | electrolytic capacitors |
| Answer» E. | |
| 40. |
Paper capacitor and mica capacitor are examples of |
| A. | ceramic capacitors |
| B. | fixed capacitors |
| C. | parallel plate capacitors |
| D. | electrolytic capacitors |
| Answer» C. parallel plate capacitors | |
| 41. |
Ability of a capacitor to store charge is affected by |
| A. | magnetic induction |
| B. | electrostatic induction |
| C. | chemical induction |
| D. | capacity |
| Answer» C. chemical induction | |
| 42. |
In coulomb's law force of attraction or repulsion between two charges is |
| A. | inversely proportional to charges |
| B. | directly proportional to product of charges |
| C. | directly proportional to square of distance between them |
| D. | Inversely proportional to distance between them |
| Answer» C. directly proportional to square of distance between them | |
| 43. |
If 1 joule of work is done against electric field in bringing 1C positive charge from infinity to a point in electric field then potential at that point will be |
| A. | 1/2 volt |
| B. | 1 volt |
| C. | 2 volt |
| D. | 3 volt |
| Answer» C. 2 volt | |
| 44. |
A charge in electric field always |
| A. | moves from lower potential to higher potential |
| B. | moves from higher potential to lower potential |
| C. | stay at higher potential |
| D. | stay at lower potential |
| Answer» C. stay at higher potential | |
| 45. |
Lines of electric field were introduced by |
| A. | Newton |
| B. | Michael Faraday |
| C. | John burges |
| D. | Henry Pascal |
| Answer» C. John burges | |
| 46. |
By using electroscope, if body is negatively charged then due to electrostatic induction, then on disk there will be appear |
| A. | both positive and negative charges |
| B. | negative charge |
| C. | positive charge |
| D. | no charge |
| Answer» D. no charge | |
| 47. |
Study of charges at rest is called |
| A. | chemical electricity |
| B. | heat electricity |
| C. | static electricity |
| D. | mechanical electricity |
| Answer» D. mechanical electricity | |
| 48. |
Like charges always |
| A. | repel each other |
| B. | attract each other |
| C. | cancel each other |
| D. | none of the above |
| Answer» B. attract each other | |
| 49. |
Unlike charges always |
| A. | cancel each other |
| B. | repel each other |
| C. | attract each other |
| D. | none of the above |
| Answer» D. none of the above | |
| 50. |
Due to electrostatic induction in aluminum rod due to charged plastic rod total charge on aluminum rod is |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | dual |
| Answer» B. positive | |