electrostatics MCQs – Page 8

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

electrostatics Mcqs
141. Selenium becomes a conductor in light so it behaves like____________?
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A. Semiconductor

B. Photodiode

C. Light emitting diode

D. Capacitor

142. One volt is the same as___________?
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A. one coulomb/joule

B. one joule/coulomb

C. one coulomb

D. one joule

143. In a capacitive circuit___________?
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A. a steady value of applied voltage causes discharge

B. an increase in applied voltage makes a capacitor charge

C. decrease in applied voltage makes a capacitor charge

D. none of the above

144. The unit of dielectric strength is given by___________?
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A. V/m

B. m/V2

C. V2/m

D. m/V

145. A capacitance of 100 fiF is connected in series with a resistance of 8000 2. The time constant of the circuit is______________?
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A. 0.8 s

B. 0.2 s

C. 0.4 s

D. 0.6 s

146. capacitors are used in transistor circuits?
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A. Ceramic

B. Air

C. Paper

D. Electrolytic

147. A capacitor is a perfect insulator for______________?
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A. direct current

B. alternating current

C. both for the direct and alternating current

D. none of above

148. 1 volt/meter is same as___________?
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A. 1 newton/meter

B. 1 meter/coulomb

C. 1 joule/coulomb

D. 1 newton meter

149. A capacitance is a circuit component that opposes the change in circuit__________?
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A. Current

B. impedance

C. None of the above

D. Voltage
150. Which of the following capacitors will have the least variation ____________?
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A. Silver plated mica capacitor

B. None of the above

C. Ceramic capacitor

D. Paper capacitor

151. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value
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A. 37, initial

B. 62, initial

C. 37, final

D. 62, final
152. A paper capacitor is usually available in the form of_____________?
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A. disc

B. meshed plates

C. tubes

D. rolled foil
153. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?
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A. CV

B. CV2

C. C2V

D. CV2

154. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?
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A. 10 times greater than before

B. 5 times greater than before

C. 5 times smaller than before

D. 25 times larger than before
155. The capacity of capacitor bank used in power factor correction is expressed in terms of____________?
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A. volts

B. kVAR

C. kVA

D. kW

156. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be______________?
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A. 1200 N/C

B. 400 N/C

C. 600 N/C

D. 800 N/C
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