1. Two insulated metal spheres X and Y are initially in contact.
While a positively charged rod is
brought near X, the spheres are separated. After this, X has a negative charge. What is the charge
on Y?
A. Negative and smaller than that on X
B. Negative and the same size as that on X
C. Positive and smaller than that on X
D. Positive and the same size as that on X
2. A perspex rod is rubbed with a woollen cloth. How does the rod gain its charge?
A. The rod gains electrons
B. The rod gains protons
C. The rod loses electrons
D. The rod loses protons
3. Two uncharged metal spheres are suspended by cotton threads. A positively charged rod is
brought near one. Which diagram shows what happens?
A. Both spheres positive
B. One induced negative, the other positive
C. Both negative
D. No change
4. On a stormy day, a positively charged cloud is above a tree. An electrical charge is induced on
the tree. What is the induced charge and movement of particles?
A. Tree becomes negative, electrons move down
B. Tree becomes negative, electrons move up
C. Tree becomes positive, electrons move down
D. Tree becomes positive, electrons move up
5. A positively charged rod is brought near an insulated metal sphere. Which diagram best shows
the induced charge distribution on the sphere?
A, B, C or D (correct option is the one showing negative induced near rod and positive far side)
6. Which sequence of events correctly charges an isolated metal sphere by induction?
P: Sphere earthed
Q: Earth removed
R: Charged rod brought near
S: Charged rod removed
A. P Q R S
B. P R S Q
C. R P Q S
D. R S P Q
7. A negatively charged balloon is brought near a wall. Which statement explains what happens?
A. Balloon charges attract negative charges in wall
B. Balloon has no effect on wall charges
C. Balloon charges repel negative charges in wall
D. Balloon charges repel positive charges in wall
8. A charged plastic rod is held near a running tap. The stream of water bends towards the rod.
What explains this?
A. Water stream becomes charged oppositely by induction
B. Stream warms and bends
C. Flow of current causes bending
D. Magnetism pulls the stream
9. In rubbing a polythene rod with a cloth, the cloth becomes positively charged. What is the charge
on the polythene rod?
A. Positive, larger
B. Positive, equal
C. Negative, larger
D. Negative, equal
10. Which of these nonmetals can conduct electricity?
A. Carbon
B. Chalk
C. Plastic
D. Rubber
11. A positively charged rod is brought near an uncharged conducting sphere suspended by
insulator. On which side of the sphere is the induced negative charge?
A. Near side
B. Far side
C. Uniformly distributed
D. No induced charge
12. What happens when a charged object is earthed?
A. Gains more charge
B. Charge remains
C. Loses its excess charge to earth
D. Becomes magnetic
13. Electric field lines around a positively charged rod point:
A. Away from the rod
B. Toward the rod
C. Circling the rod
D. In straight lines regardless of charge
14. What is the SI unit of electric charge?
A. Ampere (A)
B. Coulomb (C)
C. Volt (V)
D. Ohm ()
15. A student rubs two balloons and hangs them side by side. They both repel. Which statement
best explains why the cotton threads are not vertical?
A. Balloons attract each other
B. Balloons repel each other
C. Balloons are neutral
D. Threads are twisted
Answers
1. D
2. C
3. B
4. B
5. Diagram with negative near rod and positive far
6. C
7. C
8. A
9. D
10. A
11. A
12. C
13. A
14. B
15. B
