electrostatics Mcqs
101. at a point is equal to the negative potential gradient at that point?
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A. Electric flux

B. Magnetic flux density

C. Magnetic flux

D. Electric intensity
102. Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?
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A. positively and negatively charged

B. negatively charged

C. electrically neutral

D. positively charged

104. If two charges are increased by two times then force_____________?
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A. Increases 4 times

B. Increases 9 times

C. Decreases 9 times

D. Decreases 4 times

106. Which of the following statement is true __________?
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A. The current in the dicharging capacitor grows exponentially

B. The current in the discharging capacitor grows linearly

C. The current in the discharging capacitor decays exponentially

D. The current in the discharging capacitor decreases constantly

108. A unit tube of flux is known as tube___________?
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A. Newton

B. Faraday

C. Michale

D. None of the above

111. An electric charge at rest produces_______________?
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A. only a magnetic field

B. only an electric field

C. neither electric field nor magnetic field

D. both electric and magnetic fields

114. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
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A. all in series

B. two in series and third in parallel across this combination

C. all in parallel

D. two in parallel and third in series with this combination
115. The force per unit charge is know as__________________?
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A. electric intensity

B. electric flux

C. electric potential

D. all of above are same

116. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
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A. 1/4th of its original value

B. 4 times of its original value

C. 1/8th of its original value

D. 8 times of its original value

120. Which of the following statements is correct ?
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A. Ceramic capacitors must be connected in correct polarity

B. Electrolytic capacitors must be connected in correct polarity

C. Air capapitors have a black band to indicate the outside foil

D. Mica capacitors are available in capacitance values of 5 to 20 uF

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

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

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

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 .

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

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

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

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