electrostatics MCQs – Page 3

Practise focused electrostatics questions with marked answers for exam preparation and subject revision.

electrostatics Mcqs

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

51. Equipotential planes are_______________?
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A. parallel to one another

B. intersecting

C. circular

D. non parallel to one another

52. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will__________?
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A. remains unchanged

B. become zero

C. increase

D. decrease

53. Value of ?r for various dielectrics is always________________?
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A. Less than unity

B. Larger than unit

C. Equal to the unit

D. No hard and fast rule

54. Which of the following statements is correct ___________?
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A. Mica capacitors are available in capacitance value of 1 to 10 pF

B. Ceramic capacitors must be connected in the correct polarity

C. Air capacitors have a black band to indicate the outside foil

D. Electrolytic capacitor must be connected in the correct polarity

55. A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________?
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A. zero

B. 9000 volts

C. 90 volts

D. 900 volts

56. Electric flux due to a point charge +q is______________?
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A. 1/4II?0. q/r2

B. 1/4II? q/r

C. 4II?0

D. q/?0

57. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________?
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A. 2 joules

B. 8 joules

C. 4 joules

D. 6 joules

58. To prevent the generation of static charges on rubber or flat leather__________?
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A. oil compound dressing is done

B. conductive dressing is done

C. surface is moistened

D. talcum powder is sprayed on the surface

59. Which of the following materials has the highest value of dielectric constant___________?
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A. Vacuum

B. Oil

C. Glass

D. Ceramics

60. Which of the following capacitors preferred for high frequency circuits ?
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A. Mica capacitor

B. Air capacitor

C. none of the above

D. Electrolytic capacitor

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