electrostatics Mcqs
157. An electrolytic capacitor can be used for_____________?
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A. D.C. only

B. AC. only

C. both D.C. as well as A.C.

158. For a good 0.05 uF capacitor ohmmeter reading should___________?
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A. show high resistance momentarily and then a very low resistance

B. show low resistance momentarily and back off to a very high resistance

C. not move at all

D. go quickly to 50 ohm approximately and remain there

159. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
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A. be in unstable equilibrium

B. move out of the field of influence of the two charges

C. remain in stable equilibrium

D. not be in equilibrium

160. A field line and an equipotential surface are____________?
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A. always at 90

B. none of the above

C. always parallel

D. inclined at any angle 0

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

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
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

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

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

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

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
181. The value of E within the field due to a point charge can be found with the help of___________?
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A. Kirchhoff s laws

B. Coulombs laws

C. Faradays laws

D. none of the above

182. The electric lines of force are____________?
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A. depends upon case

B. physically existing every where

C. physically existing near the charges

D. imaginary
183. In a capacitor, the electric charge is stored in_________?
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A. dielectric

B. dielectric as well as metal plates

C. metal plates

D. none of the above