electrostatics MCQs – Page 4

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

electrostatics Mcqs

A. V/A

B. J/V

C. V/m

D. A/m

62. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?
0

A. 0.56 x 1015 m/s2

B. 1.6 x 1015 m/s2

C. 1.76 x 1015 m/s2

D. 1.5 x 1015 m/s2

63. The units of capacitance are____________?
0

A. henry/Wb

B. volts/coulomb

C. coulombs/volt

D. ohms

64. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is___________?
0

A. 0.6 F

B. 0.12 F

C. 0.8 F

D. 0.024 F

65. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will______________?
0

A. become zero

B. decrease

C. increase

D. remain uncharged

66. If free space between the plates of a capacitor is replaced by a dielectric_____________?
0

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

67. The property of a capacitor to store electricity is called its____________?
0

A. none of the above

B. energy

C. charge

D. capacitance

68. For which of the following parameter variation, the capacitance of the capacitor remains unaffected ____________?
0

A. Thickness of the plates

B. Nature of dielectric

C. Area of the plates

D. Distance between plates

69. Which of the following is not a vector ___________?
0

A. Electric potential

B. Linear momentum

C. Electric field

D. Angular momentum

70. Electric displacement is a__________quantity
0

A. scalar

B. vector

C. both of the above

D. none of the above

71. The sparking between two electrical contacts can be reduced by inserting a___________?
0

A. none of the above

B. resistance in line

C. capacitor in series with each contact

D. capacitor in parallel with contacts

72. The capacitance of a capacitor is not affected by____________?
0

A. thickness of plates

B. all of the above

C. distance between plates

D. area of plates

73. 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
0

A. 73

B. 37

C. 42

D. 63

74. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?
0

A. varying voltage produces the charging and dicharging currents

B. of high peak value

C. charging current can flow

D. discharge current can flow

75. The dissipation factor of a good dielectric is of the order of____________?
0

A. 0.2

B. 0.0002

C. 0.002

D. 0.02

76. 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____________?
0

A. 92 x 105 V/m

B. 82 x 105 V/m

C. 72 x 105 V/m

D. 62 x 105 V/m

77. A region around a stationary electric charge has__________?
0

A. an electric field

B. a magnetic field

C. both A. and (6)

D. none of the above

78. The dielectric constant (relative permittivity) of glass is given by___________?
0

A. 5 to 100

B. 0.1 to 0.4

C. 2.0 to 4.0

D. 0.5 to 1.0

79. A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?
0

A. positive

B. zero

C. negative

D. data is insufficient

80. An uncharged conductor is placed near a charged conductor, then_____________?
0

A. the uncharged conductor is attracted first and then charged by induction

B. it remains as such

C. the uncharged conductor gets charged by induction and then attracted towards the charging body

D. the uncharged conductor gets charged by conduction

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