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EE-II-UNIT 2- REVISION

Total questions: 50

Worksheet time: 37mins

Name
Class
Date
1.

Flowing of electrons in a circuit is known as _________

a)

Magnetism

b)

Electricity

c)

Voltage

2.

What is the principle of an electromagnet?

a)

Magnetic field is produced by an electric current

b)

Magnetic field is produced by magnetism

c)

Magnetic field is produced by relactance

3.

Electromagnetism is an interaction between _______ &______

a)

Electricity & Magnetism

b)

voltage & current

c)

magnet & voltage

4.

Who discovered the electromagnetic induction ?

a)

Michael faraday

b)

John Ambrouse Fleming

c)

Maxwell

5.

Example for self inductance device

a)

Resistor

b)

Capacitor

c)

Choke

6.

Mark the equipments which are work on the principle of Electromagnetic Induction?

a)

Motor

b)

Generator

c)

Current clamp meter

d)

Transformer

e)

Resistor

7.

The phenomenon due to which there is an induced current in one coil due to the current in a neighbouring coil is _____

a)

Electromagnetism

b)

Susceptance

c)

Mutual Inductance

8.

If the current in one coil becomes steady, the current in neighbouring coil is _______

a)

Infinity

b)

Zero

c)

Double

d)

One

9.

What is the SI unit of mutual inductance?

a)

Ohm

b)

Henry

c)

Volt

10.

Which among the folowing, is the current expression for mutual inductance ?

a)

M=(N2 Φ2)/I2

b)

M=(N2 Φ2)/I1

c)

M=(N1Φ2)/I2

d)

M=(N1 Φ1)/I1

11.

This picture best illustrates the construction of a(n)

a)

magnet

b)

electromagnet

c)

series circuit

d)

parallel circuit

12.
How do you make an electromagnet stronger?
a)
Add a motor and/or lightbulbs
b)
Add more light bulbs and/or wire coils
c)
add more wire coils and/or a switch
d)
add more wire coils and/or batteries
13.
A compass needle responds to a magnetic field, because the compass needle is a
a)
A. generator.
b)
B. motor.   
c)
C. magnet.
d)
D. transformer.
14.

What is magnetic force?

a)

A force exerted by electrically charged particles

b)

A force exerted by magnets that can be felt by objects near a magnet

c)

A force exerted by magnets that makes an object become electrically charged

d)

A force exerted by a magnet only when it physically touches an object

15.

Which of the following is not a good conductor?

a)

Copper

b)

Silver

c)

Aluminium

d)

Plastic

16.

Particles with opposite charges ____________ and particles with same (or like) charges ____________.

a)

attract, repel

b)

repel, repel

c)

attract, attract

d)

repel, attract

17.

The picture above is an example of what?

a)

Magnetic field

b)

Electric field

c)

Repulsion

d)

Attraction

18.

What would happen with the magnets in the picture above?

a)

They would repel

b)

Nothing

c)

They would attract

d)

They would repel and then attract

19.
The ability of some materials to attract certain metals is called
a)
Electricity
b)
Magnetism
c)
Electromagnetism
d)
Atoms
20.

If the north pole of a magnet is brought close to the south pole of another magnet, what will happen?

a)

They will atrract each other

b)

They will repel each other

c)

They will demagnitize

d)

The south pole will turn around so the north pole is facing the other magnet.

21.

Which sides of the magnet repel each other?

a)

A) North and North Pole

b)

B) South and South Pole

c)

C) The North and South Pole

d)

D) A and B

e)

E) A, B,C

22.

Which answer describes a magnet best.

a)

A material that has two north poles

b)

A material that has a two south poles

c)

A material that has a north and a south pole

d)

An electron

23.

Which sides of the magnet attract each other?

a)

A) North and North Pole

b)

B) South and South Pole

c)

C) The North and South Pole

d)

D) A and B

e)

E) A, B,C

24.
What kind of magnet can be turned on and off? (Man-made magnet)
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
25.
Choose the best option to complete this gap:
A magnetic field is the ________ around a magnet in which the magnetic force acts.
a)
pole
b)
electron
c)
area
d)
iron
26.
A material in which electrons are not able to move easily 
a)
Circuit 
b)
Insulator 
c)
Resistance 
d)
Conductor
27.
An example of an insulator is:
a)
iron
b)
silver
c)
copper wire
d)
rubber
28.

The relationship between electricity and magnetism is called

a)

solenoid

b)

transformer

c)

electromagnetism

d)

electromagnet

29.
___ Law says that the Induced current is proportional to the change of magnetic flux 
a)
Lenz'
b)
Faraday's
c)
Ampere's
30.
___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux
a)
Lenz'
b)
Faraday's
c)
Ampere's
31.
In 1831 who discovered electromagnetic induction?
a)
Thomas Edison
b)
Nikola Tesla
c)
Michael Faraday
32.

What happens to the galvanometer if the copper rod is moved upwards?

a)

No change

b)

Deflect to the right

c)

Deflect to the left

d)

Deflect to the right and left

33.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear 
b)
The magnet would explode 
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
34.
The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?
a)
Flip the magnet around so the North pole is facing out
b)
Move the magnet back and forth
c)
Take the magnet out
d)
Add more coils around the paper cylinder
35.

Which action will increase the deflection of the galvanometer pointer?

a)

The magnetic pole is reversed

b)

The number of turns of coils is increased

c)

The coil is made from insulated wire

d)

The magnet is slowly pushed into the coil

36.
How could the experimenter increase the amount of electricity being induced by this experiment?
a)
Increase the number of coils
b)
Decrease the number of coils
c)
Flip the magnet around
d)
Nothing, the amount of electricity cannot be increased
37.
What benefit is gained by the addition of the iron core in an electromagnet?
a)
It makes a strong magnet weaker
b)
It makes a weak magnet stronger
c)
There is no benefit at all
d)
It lets currents interact with each other
38.

As the north pole of the magnet is moved into the coil, the magnetic flux is _________.

a)

increasing

b)

decreasing

c)

remains constant

d)

depends on the speed of the magnet

39.
A device that converts mechanical energy into electrical energy
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. mechanical  generator
40.

What happen to the Galvanometer?

a)

Deflected to the right

b)

Deflected to the left

c)

Nothing happen

41.

What is the Pole at X

a)

North

b)

South

42.

What happen to the Galvanometer?

a)

Deflected to the right

b)

Deflected to the left

c)

Nothing happen

43.

Click all the factors affecting electromagnetic induction

a)

Strength of magnet

b)

The area of the coil

c)

The speed of movement

d)

Number of turns of coil

e)

The position of poles

44.

Based on the picture in red box,

Why the Galvanometer pointer is at the middle?

a)

Current flow through wire

b)

There is change in magnetic flux

c)

No change in magnetic flux

45.
Voltage can be induced in a wire by
a)
a. moving the wire near a magnet.
b)
b. moving a magnet near the wire.
c)
c. changing the current in a nearby wire.
d)
d. all of these
46.
Electromagnetic induction is change in ___________________. 
a)
surface area
b)
magnetic poles
c)
magnetic flux
47.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 
a)
quadruples
b)
doubles
c)
is the same
d)
halves
48.
A magnet can move in a coil of wire to produce electricity in which system?
a)
Generator
b)
Motor
c)
Magnet
d)
Transformer
49.
___ Law says that the Induced current is proportional to the change of magnetic flux 
a)
Lenz'
b)
Faraday's
c)
Ampere's
50.

Can you produce current in a wire with a magnet that is sitting still?

a)

Yes; having a magnet near a wire is enough to excite the electrons

b)

No; the magnetic field has to be changing to excite the electrons

c)

No; magnets cannot create electricity

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