This document contains a quiz on concepts in electrostatics: 1. The dimension of charge is Coulombs (C). 2. When a glass rod is rubbed with fur, the glass rod becomes negatively charged and the fur positively charged due to electrons transferring from the glass to the fur. 3. When a glass rod is rubbed with fur, the glass rod gains an excess of electrons which are transferred from the fur.

1. DPP 1 – 12TH
Class [Electrostatics]
1. Dimension of charge is
a) CL-1
b) C c) M0
L0
C d) AT
2. When Glass rod and ebonite rod are rubbed with a
fur then which of the following is true
a) Glass rod gets negatively charged while ebonite rod
gets positively charged
b) Glass rod remains neutral while fur becomes
negatively charged
c) Glass rod and ebonite rods regets each other
d) Glass rod gets positively charged and ebonite rod
gets negatively charged
3. When Glass rod is rubbed with fur
a) Glass rod gains excess of electrons
b) Fur gains excess of electrons
c) Glass rod gains excess of protons
d) Glass rod becomes deficient of electrons
4. 1 coulomb charge equals
a) 3x109
esub) 3x109
stat c c) both A&B d)
None
5. When charges are on motion then there is
a) Electric effect b) Magnetic
effect
c)Both electric & magnetic effect d) Electro
magnetic effect
e) C & D

2. 6. Two electrons are projected parallel to each other in
the same direction. They will
a) Attract each other
b) Repel each other
c) 1stly repel then attract
d) Nothing can be said
7. If a body is charged by rubbing it, its weight
a) Remains precisely constant
b) Increase slightly
c) Decrease slightly
d) may increase slightly or may decrease slightly
8. If e=-1.Cx10-19
c is the charge on the electron the
which charge value is possible
a) 2/3e b) 5/2e c) 1.7e
d)-10e
9. How many electorns are there in one coulomb of
electricity
a) 6.24x1017
electrons b) 6.24x1019
electrons
c) 6.24x1018
electrons d) 7x109
electrons
10. When 1014
electorns are removed form a neutral
metal sphere, the charge on the sphere becomes
a) 16 uc b) -16 uc c) 52 uc d) -32
uc
11. A conductor has 14.4 x 10-19
c positive charge. The
conductor has
a) 9 electrons in excess b) 27 electrons in
short
c) 27 electrons in excess d) 9 electrons in short

3. 12. Which of the following is correct
a) The total charge of the Universe is constant
b) The total positive charge of the Universe is constant
c) The total negative charge of the Universe is
constant
d) The total number of charged particles in the
Universe is constant
13. Choose the correct statement :-
a) If two bodies attract then both are charges and have
opposite charges respectively
b) If two bodies repel each other then both are of
similar charges
c) A body can be charged only be friction.
d) Attraction is the sure test for charging.
14. Which of the following does not changes with
speed.
a) Mass b) Mass density c) charge density
d) charge
15. When a negatively charged rod is brought near the
cap of a gold leaf electroscope whose case is earthed ,
then
a) leaves well have induced positive charge
b) Positive charge is induced on one leaf and negative
on the other
c) No charge is induced on the leaves
d) The leaf has an induced negative charge.
16. If ‘k’ is the dielectric constant of the Material of
the uncharged body, The maximum value of induced
charge (q) while inducing charge is Q

4. a) qmax = Q/k b) qmax = (Q/k-1)
c) qmax = 1/k-1 d) qmax = -Q [ 1-1/k]
17. Coulomb force between two charges is attracted
then
a) 9192>0 b) 9192<0 c) 9192=0 d)
None
18. What is the minimum electrical force between two
charged particles 1m apart in free space ?
a) 2.304x10-28
N b) 2.304x10-27
N
c) 1.9x10-28
N d) 1.9x10-26
N
19. The two charges +2uc and -3uc. The ratio of
forces acting on them will be
a) 2:3 b) 1:1 c) 3:2 d) 4:9
20. Nucleus 92U238
emits -particles (2He4
). -
particles has atomic number 2 and mass No.4 . At any
instant - particles is at distant of 9x10-15m from the
centre of nucleus of Uranium. What is the force on -
particles at this instant?
92U238
2He4
+ 90Th234
a) 212 N b) 312 N c) 412 N d) 512 N
21. A sphere of lead of mass 10 g has not charge -
2.5x10-9
c. Find the number of excess electrons on the
sphere
a) 5x10-12
b) 5.36x10-13
c) 1.56x1010
d)
2x108

5. 22. In above example if atomic mass of the lead is 207
g/moq. How many excess electrons are per lead atom ?
a) 6.0x1022
b) 5.036x10-13
c) 4x10-12
d)
None
23. Three Similar charges are placed at the corner of
an equilateral triangle. A charge ‘q’ at the centre will
experience force
a) less than 1 N b) between ON & IN
c) ON d) Nothing can be said
24. Distance between two charges are increased twice.
Force will
a) Increase twice
b) Decrease twice
c) Decrease four times
d) Decrease 1/4 times