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Free download in PDF Electrostatics Multiple Choice Questions(MCQs) and Answers. These short objective type questions with answers are very important for competitive exams like IIT, JEE, NEET, AIIMS, JIPMER etc.
(1)
To relieve discomfort of allergy sufferers in homes, we use
[A]
vacuum cleaner
[B]
electrostatic air cleaner
[C]
wind cleaner
[D]
none of the above
Answer: electrostatic air cleaner
(2)
Value of k in coulomb's law depends upon
[A]
magnitude of charges
[B]
distance between charges
[C]
both A and B
[D]
medium between two charges
Answer: medium between two charges
(3)
1 pico farad (1pF) is equal to
[A]
1×10-9F
[B]
1×10-12F
[C]
1×10-6F
[D]
1×10-10F
(4)
Coulomb is equal to charge of
[A]
8.25×1018
[B]
6.25×1018
[C]
7.25×1018
[D]
5.25×1018
(5)
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become
[A]
1/4th of its original value
[B]
1/8th of its original value
[C]
4 times of its original value
[D]
8 times of its original value
Answer: 4 times of its original value
(6)
Selenium becomes a conductor in light so it behaves like
[A]
Semiconductor
[B]
Photodiode
[C]
Light emitting diode
[D]
Capacitor
(7)
If an electrons is allowed to move along the field in a non uniform electric field then it will follow
[A]
Spiral path
[B]
Straight line
[C]
Curved path
[D]
Circular path
(8)
If F is force acting on test charge qo, electric field intensity E would be given by
[A]
E = F - qo
[B]
E = F/qo
[C]
E = F + qo
[D]
E = qo/F
(9)
Property of material due to which it attracts or repels other objects is
[A]
friction
[B]
velocity
[C]
current
[D]
charge
(10)
If medium between two charges is air, then value of constant k in SI units will be
[A]
5 × 109 Nm²C-2
[B]
7 × 109 Nm²C-2
[C]
8 × 109 Nm²C-2
[D]
9 × 109 Nm²C-2
(11)
Charge on capacitor plates is directly proportional to
[A]
current
[B]
electric field intensity
[C]
potential difference
[D]
resistance
Answer: potential difference
(12)
A capacitor holds 0.03 C of charge when fully charged by a 6V battery. To hold 2C of charge, voltage required would be
[A]
150V
[B]
100V
[C]
300V
[D]
400V
(13)
When we rub a glass rod with a silk cloth then
[A]
glass rod acquires negative charge while silk acquires positive charge
[B]
glass rod acquires positive charge while silk acquires negative charges
[C]
both glass rod and silk acquire negative charge
[D]
both glass rod and silk acquire positive charge
Answer: glass rod acquires positive charge while silk acquires negative charges
(14)
Electric charge of 100 ?C is 13cm apart from another charge 16.9?C electric force between them is
[A]
9x107N
[B]
900N
[C]
9x105N
[D]
9x106N
(15)
Work done in moving a point charge from one point to another point of equipotential surface is
[A]
?W = 1?V
[B]
?W = F?r
[C]
zero
[D]
W = 1/4????V
(16)
If mica sheet is placed between the plates of a capacitor the capacity
[A]
increases
[B]
decreases
[C]
increases then decreases
[D]
decreases then increases
(17)
Thunderclouds are charged by friction between
[A]
clouds and air
[B]
layers of clouds
[C]
water molecules and air
[D]
layers of air
Answer: water molecules and air
(18)
The minimum charge on any object cannot be less than
[A]
1.6 x 10-19C
[B]
3.2 x 10-19C
[C]
9.1 x 109C
[D]
no definite value exist
(19)
To distinguish between insulators and conductors, we can use
[A]
electroscope
[B]
telescope
[C]
endoscope
[D]
fiberscope
(20)
1 pico farad (1pF) is equal to
[A]
1×10-9F
[B]
1×10-12F
[C]
1×10-6F
[D]
1×10-10F
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