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Electrostatics Quiz | Electrostatics Objective Type Questions & Answers

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Questions
21 Charge on capacitor plates is directly proportional to
A current
B electric field intensity
C potential difference
D resistance

Answer: electric field intensity
22 If the distance between the two point charges become half then force between them becomes
A double
B half
C four times
D remains same

Answer: four times
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23 The force per unit charge is know as
A electric flux
B electric intensity
C electric potential
D all of above are same

Answer: electric intensity
24 Electric field due to positive charged plate is E = ?/2??. If oppositely charged plate of same amount is placed parallel to it, then resultant field contains amount of energy
A Q/?oA
B Q/e
C QV2
D Q2/C

Answer: Q2/C
25 If two charges are increased by two times then force
A Decreases 9 times
B Increases 9 times
C Increases 4 times
D Decreases 4 times

Answer: Increases 4 times
26 In equation Q=CV, C is constant of proportionality called capacitor's
A power
B capacitance
C heat
D electric intensity

Answer: capacitance
27 In equation Q=CV, C is constant of proportionality called capacitor's
A power
B capacitance
C heat
D electric intensity

Answer: power
28 Capacitance of a capacitor is 100μF and potential difference between plates is 50 volts then charge stored on each plate is
A 10 mC
B 5 mC
C 4 mC
D 15 mC

Answer: 5 mC
29 An electric field can deflect
A neutrons
B ?-rays
C both glass rod and silk acquire negative charge
D none

Answer: none
30 For what value of ? the electric flux has average value of those of extreme values ?
A 60?
B 45?
C 90?
D 0?

Answer: 60?
31 Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will
A decrease
B increase
C remain constant
D depends upon composition of dielectric

Answer: decrease
32 An electric charge at rest produces
A only a magnetic field
B only an electric field
C neither electric field nor magnetic field
D both electric and magnetic fields

Answer: only an electric field
33 3 capacitors with capacitances 5µF, 6µF and 7µF are arranged in parallel combination with a battery of 5V, as 1µF = 10-6F, voltage across each capacitor is
A 15V
B 5V
C 18V
D 20V

Answer: 5V
34 SI unit of electric potential is
A volts
B ohm
C coulomb
D newton

Answer: volts
35 Tick the only wrong statement.
A similar charges repel each other
B dissimilar charges attract each other
C repulsion is the sure test of electrification
D an electrically neutral body is repelled both positively and negatively charged bodies

Answer: an electrically neutral body is repelled both positively and negatively charged bodies
36 Photocopier and inject printer are dealt in
A Electrostatics
B Charges in motion
C Capacitors
D Electric fields

Answer: Electrostatics
37 If metallic conductor is charged negatively then its weight
A Remains same
B First increases then decreases
C Decreases then increases
D Increases for a while

Answer: Increases for a while
38 Coulomb is equal to charge of
A 8.25×1018
B 6.25×1018
C 7.25×1018
D 5.25×1018

Answer: 6.25×1018
39 Coulomb's law is only true for point charges whose sizes are
A medium
B very large
C very small
D none of the above

Answer: very small
40 In combination of capacitors in series, capacitors are connected
A parallel
B side by side
C up and down
D none of the above

Answer: side by side