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Free download in PDF Electrostatics Objective Type Questions & Answers for competitive exams.These short objective type questions with answers are very important for competitive exams like IIT, JEE, NEET, AIIMS, JIPMER etc.
(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
(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
(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
(27)
In equation Q=CV, C is constant of proportionality called capacitor's
[A]
power
[B]
capacitance
[C]
heat
[D]
electric intensity
(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
(29)
An electric field can deflect
[A]
neutrons
[B]
?-rays
[C]
both glass rod and silk acquire negative charge
[D]
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?
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
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
34
SI unit of electric potential is
[A]
volts
[B]
ohm
[C]
coulomb
[D]
newton
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
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
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
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
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