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Electrical charge and its properties
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Electrical charge and its properties
1. A soap bubble is given a negative charge, then its radius
(a) Decreases
(b) Increases
(c) Remains unchanged
(d) Nothing can be predicted as information is
insufficient
2.In the absence of other conductors, the surface charge density
(a) Is proportional to the charge on the conductor and its surface area
(b) Inversely proportional to the charge and
directly proportional to the surface area
(c) Directly proportional to the charge and
inversely proportional to the surface area
(d) Inversely proportional to the charge and the
surface area
3. A body can be negatively charged by
(a) Giving excess of electrons to it
(b) Removing some electrons from it
(c) Giving some protons to it
(d) Removing some neutrons from it
4. The minimum charge on an object is
(a) 1 coulomb
(b) 1 stat
coulomb
(c) 1.6 X 10-19 coulomb
(d) 3.2
X 10-19 coulomb
5. An isolated solid metallic sphere is given +Q charge. The charge will be
distributed on the sphere
(a) Uniformly but only on surface
(b) Only on surface but non-uniformly
(c) Uniformly inside the volume
(d) Non-uniformly inside the volume
6. There are two metallic spheres of same radii but one is solid and the
other is hollow, then
(a) Solid sphere can be given more charge
(b) Hollow sphere can be given more charge
(c) They can be charged equally (maximum)
(d) None of the above
7. In general, metallic ropes are suspended on the carriers which take
inflammable material. The reason is
(a) There speed is controlled
(b) To keep the centre of gravity of the carrier
nearer to the earth
(c) To keep the body of the carrier in contact
with the earth
(d) Nothing should be placed under the carrier
8. When 1014 electrons are removed from a neutral metal sphere,
the charge on the sphere becomes
(a) 16µC
(b)
- 16µC
(c) 32µC
(d) -32µC
9.A conductor has 14.4 X10-19 coulombs positive charge. The
conductor has (Charge
on electron)= 1.6 X10-19 coulombs
(a) 9 electrons in excess
(b) 27 electrons in short
(c) 27 electrons in excess
(d) 9 electrons in short
10. Number of electrons in one coulomb of charge will be
(a) 5.46 X 1029
(b) 6.25
X 1018
(c) 1.6 X 1019
(d) 9
X 1011
11. A glass rod rubbed with silk is used to charge a gold leaf electroscope
and the leaves are observed to diverge. The electroscope thus charged is
exposed to X-rays for a short period.
Then
(a) The divergence of leaves will not be affected
(b) The leaves will diverge further
(c) The leaves will collapse
(d) The leaves will melt
12. One metallic sphere A is given positive charge whereas another identical
metallic sphere B of exactly same mass as of A is given equal amount of
negative charge. Then
(a) Mass of A and mass of B still remain equal
(b) Mass of A increases
(c) Mass of B decreases
(d) Mass of B increases
13. Charge on α-particle is
(a) 4.8 X 10-19 C
(b) 1.6 X 10-19 C
(c) 3.2 X 10-19 C
(d) 6.4 X 10-19 C
14. When a glass rod is rubbed
with silk, it
(a) Gains electrons from silk
(b) Gives electrons to silk
(c) Gains protons from silk
(d) Gives
protons to silk
15. A charge of Q coulomb is placed on a solid piece of
metal of irregular shape. The charge will distribute itself
(a) Uniformly
in the metal object
(b) Uniformly
on the surface of the object
(c) Such
that the potential energy of the system is minimised
(d) Such
that the total heat loss is minimised
16.Five balls numbered 1 to 5 are suspended using separate threads. Pairs
(1, 2), (2, 4) and (4, 1) show electrostatic
attraction, while pair (2, 3) and
(4, 5) show repulsion. Therefore ball 1 must be
(a) Positively charged
(b) Negatively charged
(c) Neutral
(d) Made of metal
17.Two identical conductors of
copper and aluminium are placed in an identical electric fields. The magnitude
of induced charge in the aluminium will be
(a) Zero
(b) Greater than in copper
(c) Equal to that in copper
(d) Less
than in copper
18.When a body is earth connected, electrons from the earth flow into the
body. This means the body is…..
(a) Unchanged
(b) Charged positively
(c) Charged
negatively
(d) An insulator
19. Four metal conductors
having different shapes
1. A sphere 2. Cylindrical
3. Pear 3. Lightning conductor
are mounted on insulating stands and charged. The one which is best
suited to retain the charges for a longer time is
(a) 1
(b) 2
(c) 3
(d) 4
