electrostatics MCQs – Page 7

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

electrostatics Mcqs

121. Dielectric strength _________ with increasing thickness
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A. none of the above

B. decreases

C. remains unaltered

D. increases

122. A gang condenser is a____________?
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A. variable capacitor

B. polarised capacitor

C. none of the above

D. ceramic capacitor

123. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?
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A. 1600 uC

B. 1200 uC

C. 900 uC

D. 800 uC

124. select the correct statement?
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A. the electric lines of force have no physical existence

B. all the above statements are true

C. they expand laterally and contract longitudinally

D. they do not cross each other and group together in dielectric

125. capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?
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A. 9 volts

B. 4 volts

C. 2 volts

D. 1 vol

126. The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?
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A. CIR

B. RIC

C. RC

D. 1/RC

127. The electric charge of 100 C is 13cm apart from another charge 16.9C electric force between them is_____________?
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A. 9x106N

B. 900N

C. 9x105N

D. 9x107N

128. In a non-uniform electric field a polar molecule will experience____________?
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A. Net torque

B. Net force

C. both series and parallel combinations

D. zero

129. A 25eV electron has a speed of______________?
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A. 4 x 106m/sec

B. 5 x 106m/sec

C. 3 x 106m/sec

D. 2 x 106m/sec

130. The capacitor preferred for high frequency circuits is_____________?
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A. none of the above

B. mica capacitor

C. air capacitor

D. electrolytic capacitor

131. Dielectric strength of a medium is usually expressed in____________?
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A. N/mm

B. C/m2

C. kV/mm

D. J/mm

132. Which of the following statements is incorrect ?
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A. A capacitor can store charge because it has a dielectric between two conductors

B. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

C. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

D. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .

133. The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?
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A. electrons

B. neutrons

C. protons

D. electric field

134. Electric intensity at infinite distance from the point charge is_____________?
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A. zero

B. positive

C. negative

D. infinite

135. The number of electrons in one coulomb charge is equal to_______________?
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A. 1.6 x 10-27

B. 1.6 x 1019

C. 6.2 x 1018

D. 6.2 x 1021

136. Paper condenser is___________?
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A. a variable condenser

B. always polarised

C. usually of fixed value

D. electrolytic condenser

137. Dielectric strength of medium____________?
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A. increases with rise in temperature

B. increases with moisture content

C. is same for all insulating materials

D. none of the above

138. is that property of a capacitor which delays any change of voltage across it ?
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A. None of the above

B. Capacitance

C. Inductance

D. Potential gradient

139. The unit of capacitance is__________?
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A. farad

B. ohm

C. farad/m

D. henry

140. A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
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A. 4 x 103 C

B. 2.5 x 10-8 C

C. 10-5 C

D. 103 C

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