electrostatics Mcqs
1. A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?
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A. 1000J

B. 200J

C. 100 eV

D. 100J
2. Which one of the following can be taken as the measure of electric intensity ?
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A. VF/A

B. F/A

C. q/VA

D. V/A
3. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
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A. 200 joules

B. 150 joules

C. 250 joules

D. 50 joules

4. The lines of force due to charged particles are_________?
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A. sometimes curved

B. always curved

C. always straight

D. none of the above

5. The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be____________?
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A. 36 x 108 N

B. 36 x 107 N

C. 36 x 10fa

D. 36 x 109 N
6. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________?
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A. 100 nF

B. 10 F

C. 10 uF

D. 1000 uF

7. A condenser suitable for D.C. only is________?
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A. poled aluminium electrolytic condenser

B. metallic plate variable gang condenser

C. oil impregrated paper condenser

D. metallic paper capacitor

8. If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
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A. 50 uF

B. 40 uF

C. 20 uF

D. 30 uE
9. Which of the following statements is incorrect _________________?
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A. A wire cable has distributed capacitance between the conductors

B. The stored energy in a capacitor increases with applied voltage

C. The leakage resistance of ceramic capacitors is generally high

D. The stored energy in a capacitor decreases with reduction in value of capacitance
10. The electric field at a point situated at a distance d from straight charged conductor is____________?
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A. inversely proportional to d

B. proportional to d

C. none of the above

D. inversely proportional to d

11. The relative permittivity has the following units__________?
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A. Wb/m

B. F/m

C. no units

D. m/F

12. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance _______?
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A. Ceramic capacitor

B. Mica capacitor

C. Both will have identical value of capacitance

D. It depends on applied voltage

13. Which of the following expression is correct for electric field strength___________?
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A. E = D/E

B. E= nD2

C. E = jtD

D. E = D2/t

14. Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?
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A. milli-coulomb

B. coulomb

C. pico-coulomb

D. micro-coulomb
15. The relative permittivity of free space is given by__________?
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A. 10

B. 1000

C. 100

D. 1
16. ____________field is associated with the capacitor?
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A. Electric

B. Magnetic

C. Both (A) and (B)

D. None of the above

17. 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_______________?
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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

18. The total deficiency or excess of electrons in a body is known as____________?
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A. voltage

B. potential gradient

C. charge

D. current

19. Paper capacitors usually have a tolerance of___________?
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A. 5%

B. 20%

C. 15%

D. 10%
20. Permittivity is expressed in_____________?
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A. Weber/meter

B. Farad/sq-m

C. Farad/meter

D. Weber/sq-m

21. If a charged rod is brought closer to a gas filled balloon then______________?
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A. Balloon bursts

B. Balloon squeezes

C. Radius decreases

D. Radius increase
22. Equivalent capacitance is greater than individual capacitances in_____________?
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A. series combination

B. parallel combination

C. both series and parallel combinations

D. none of above

23. The bridge used for the measurement of the value of the capacitance is____________?
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A. Wiens bridge

B. Hays bridge

C. Schering bridge

D. Wheatstone bridge

24. The presence of an uncharged conductor near a charged one increases the__________?
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A. all of the above

B. charge of the charged conductor

C. potential of the charged conductor

D. capacity of the charged conductor
25. capacitors are used for audio frequency and radio frequency coupling and tuning ?
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A. Air

B. Plastic film

C. Ceramic

D. Mica
26. Which of the following capacitor is preferred in case of single phase motor ?
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A. Mica capacitor

B. Ceramic capacitor

C. Electrolytic capacitor

D. Paper capacitor

27. Mica capacitors are characterized by all of the following except___________?
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A. accurate value

B. stable operation

C. low losses

D. low leakage reactance
28. For making a capacitor, it is better to select a dielectric having___________?
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A. permittivity slightly more than that of air

B. low permittivity

C. permittivity same as that of air

D. high permittivity
29. In a charged capacitor the energy resides in________________?
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A. magnetic hield

B. nuclear field

C. gravitational field

D. electric field
30. The power dissipated in a pure capacitor is______________?
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A. zero

B. proportional to applied voltage

C. proportional to value of capacitance

D. both (B) and (C) above

31. A capacitor consists of two____________?
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A. conductors separated by an insulator

B. silver-coated insulators

C. insulators separated by a dielectric

D. ceramic plates and one mica disc

32. Dielectric strength of a material depends on_____________?
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A. thickness

B. temperature

C. moisture content

D. all of the above

E. none of the above

33. In the case of a lossy capacitor, its series equivalent resistance value will be_______________?
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A. very small

B. small

C. large

D. zero

34. 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____________?
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A. open circuited

B. leaky

C. short-circuited

D. alright

35. Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ?
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A. Ceramic capacitor

B. Mica capacitor

C. Paper capacitor

D. Aluminium foil capacitor

36. 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____________?
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A. charge on the capacitor decreases

B. charge on the capacitor increases

C. voltage across the plates decreases

D. Voltage across the plates increases

37. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?
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A. It will get punctured or cracked

B. It will melt

C. It will become magnetic

D. Its molecular structure will get changed

38. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as____________?
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A. chemical effect

B. magnetic effect

C. pholoelectric effect

D. induction
39. The absolute permittivity of free space is given by_____________?
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A. 8.854 x KT11 F/m

B. 8.854 x 1(T9 F/m)

C. 8.854 x 10?12 F/m

D. 8.854 x 1(T10 F/m)
40. A dielectric material must be____________?
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A. good conductor

B. semi conductor

C. resistor

D. insulator
41. Which capacitor will be physically smaller for the same ratings ___________?
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A. Ceramic capacitor

B. Paper capacitor

C. Both will be of equal size

D. None of the above

42. Photocopier and inject printer are dealt in________________?
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A. Electrostatics

B. Capacitors

C. Charges in motion

D. Electric fields

43. Electric intensity at any point in an electric field is equal to the at that point?
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A. electric flux

B. potential gradient

C. none of the above

D. magnetic flux density

44. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
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A. Paper capacitor

B. Electrolytic capacitor

C. Any-of the above

D. Ceramic capacitor

45. capacitors are mainly used for radio frequency tuning?
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A. Electrolytic

B. Paper

C. Air

D. Mica

46. select the only wrong statement?
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A. similar charges repel each other

B. dissimilar charges attract each other

C. repulsion is the sure test of electrification

D. an electrically neutral body is repelled both positively and negatively charged bodies
47. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
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A. 50 pF

B. 150 pF

C. 200 pF

D. 100 pF
48. When the dielectric is homogeneous,the potential gradient is_____________?
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A. uniform

B. zero

C. any of the above

D. non-uniform

49. The units of volume charge density are___________?
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A. Coulomb/meter

B. Coulomb/meter

C. Coulomb/meter

D. Coulomb/meter
50. When we rub a glass rod with a silk cloth then________________?
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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