electrostatics MCQs – Page 9

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

electrostatics Mcqs
161. If mica sheet is placed between the plates of a capacitor the capacity_______________?
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A. decreases then increases

B. decreases

C. increases

D. increases then decreases

162. Which of the following capacitors is marked for polarity ?
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A. Mica

B. Air

C. Paper

D. Electrolytic
163. An electric field can deflect_______________?
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A. Neutrons

B. X-rays

C. Both glass rod and silk acquire a negative charge

D. None
164. If three 15 uF capacitors are connected in series, the net capacitance is
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A. 50 uF

B. 5 uF

C. 30 uF

D. 45 uF

165. If the distance between the two point charges become half then force between them becomes______________?
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A. remains same

B. half

C. four times

D. double

166. The value of dielectric constant for vacuum is taken as____________?
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A. 4

B. 1

C. zero

D. 10

167. In a cable capacitor, voltage gradient is maximum at the surface of the______________?
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A. sheath

B. insulator

C. conduction

D. earth

168. The capacitance between two plates increases with____________?
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A. shorter plate area and shorter distance between them

B. shorter plate area and higher applied voltage

C. larger plate area and shorter distance between plates

D. larger plate area, longer distance between plates and higher,applied voltage

169. The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface. The above statement is associated with_______?
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A. Faradays law

B. Gausss law

C. Kirchhoff s law

D. Lenzs law

170. The minimum charge on any object cannot be less than_______________?
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A. no definite value exist

B. 1.6 x 10-19C

C. 9.1 x 109C

D. 3.2 x 10-19C

171. Dielectric constant for mica is nearly_____________?
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A. 200

B. 100

C. 1 to 2

D. 3 to 8
172. If metallic conductor is charged negatively then its weight______________?
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A. Increases for a while

B. First increases then decreases

C. Remains same

D. Decreases then increases

173. The minimum value of potential gradient in a cable occurs in____________?
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A. conductor

B. uniformly all over

C. outer sheath

D. insulation
174. For closer tolerances which of the following capacitors is usually preferred ?
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A. Ceramic disc capacitor

B. Mica capacitor

C. None of the above

D. Paper capacitor

175. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is_____________?
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A. 0.6 F

B. 0.8 F

C. 0.12 F

D. 0.024 F
176. Dielectric strength of mica is___________?
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A. 10 to 20 kV/mm

B. 30 to 50 kV/mm

C. 50 to 200 kV/mm

D. 300 to 500 kV/mm

177. The value of the capacitance depends upon the________________?
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A. thickness of the capacitor plates

B. geometry of the capacitor

C. dinsity of the capacitor plates

D. voltage applied

178. Electric intensity being a vector quantity always points_______________?
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A. opposite to the direction of force experienced by a unit positive charge

B. along the direction of force experienced by a unit positive charge

C. perpendicular to the direction of force experienced by a uit positive charge

D. any of above

179. If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
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A. satisfactory

B. charged

C. lossy

D. short-circuited
180. Which of the following capacitors can be used for temperature compensation ?
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A. Paper capacitor

B. Air capacitor

C. None of the above

D. Ceramic capacitor