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Unit 12: Magnetism Review

Total questions: 60

Worksheet time: 4hrs 42mins

Name
Class
Date
1.

Arrows are close together on a force field when the force is

a)

stronger

b)

weaker

c)

opposite

2.

A compass needle shows us the magnetic field of

a)

the sun

b)

Earth

c)

the moon

d)

a magnet that is near by

3.

Earth has a magnetic field that is similar to a bar magnet's magnetic field.

a)

true

b)

false

4.

Earth's magnetic South Pole is near Earth's geographic North Pole

a)

true

b)

false

5.

Electronic devices create magnetic fields because they

a)

are magnets

b)

are compasses

c)

have moving particles with electric charge

6.

How can you test to see if there is a current running through a wire?

a)

listen carefully to see if you hear a buzzing sound

b)

place several compasses around the wire

c)

place several batteries around the wire

7.

The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

a)

making the wire shorter

b)

making the wire longer

c)

making the wire into loops

8.

An electromagnet is a magnet that

a)

its strength can be varied and turned on and off

b)

always has a magnetic field around it

c)

has very little strength

9.

Refrigerator magnets and bar magnets are what type of magnet?

a)

electromagnet

b)

electronic

c)

permanent

10.

What THREE ways are electromagnets different from permanent magnets?

a)

they can be turned off and on

b)

they can increase in strength by increasing the current in the wire

c)

they are smaller in size

d)

they can change which is the north and south pole

11.

Permanent Magnets and Electromagnets are similar in which TWO ways?

a)

it can be turned off and on

b)

they both have a north and south pole

c)

they are surrounded by a magnetic field

12.

A force that can act at a distance is called

a)

non contact force

b)

friction

c)

balanced

13.
What effect will the south pole of one magnet have on the south pole of another magnet?
a)
Repulsive
b)
Attractive
c)
Combative
d)
No effect
14.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
15.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
16.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
17.
In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.
a)
wire, iron, electric
b)
electric, wire, iron
c)
iron, electric, wire
d)
excited, hair, apple
18.
What is most likely to happen when the switch is closed?
a)
A magnetic field should be produced
b)
The nail will rust
c)
The battery will explode
d)
The wire will catch on fire
19.
What are the ends of a magnet called?
a)
East and west poles
b)
Left and Right ends
c)
North and South ends
d)
North and South poles
20.
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.
21.

Sophia made an electromagnet but it was very weak. How can she make it stronger?

a)

take away the battery

b)

wrap the wire loosely

c)

use less copper wire

d)

coiled more copper wire

22.

What component becomes a temporary magnet when electricity is flowing through the circuit?

a)

iron nail

b)

copper wire

c)

battery

d)

switch

23.
What is the name of a magnet that stays magnetic only while it touches a permanent magnet, or one that is magnetic for a very short time
a)
Temporary magnet
b)
Permanant magnet
c)
Electromagnet
d)
Magnet
24.
what is the earths magnetic field useful for 
a)
deflecting the solar wind, charged particles that come from the Sun.
b)
wind
c)
sun
d)
light
25.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
26.
How is Earth's magnetic field similar to that of a magnet?
a)
It is hundreds of miles long
b)
It has north and south poles
c)
It is made in Earth's core
d)
It is shaped like a horseshoe
27.
What is our best evidence that Earth has a magnetic field?
a)
All things fall toward Earth's center
b)
A compass needle lines up with it
c)
Winds blow from east to west
d)
Earth's oceans all have currents
28.
Earth's magnetic field and a bar magnet attract particles to the same locations. Where are they?
a)
The middle
b)
All around the outside
c)
The north and south poles
d)
First to the middle, then to the ends
29.
Why does a compass needle point north?
a)
The compass is a bar magnet
b)
Because north is up
c)
Because it's magic
d)
It lines up with the Earth's magnetic field
30.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
31.
Spinning electrons themselves are small magnets.
a)
true
b)
false
32.
This substance is
a)
magnetizecd
b)
unmagnetized
c)
positively charged
d)
negatively charged
33.
You know this substance is magnetized because
a)
all the domains have right angles
b)
the arrows are drawn in red
c)
the domains are aligned
d)
the domains are random
34.
Where are the magnetic force the strongest in this picture?
a)
Location 1
b)
Location 2
c)
Location 3
d)
Location 4
35.

Why does a compass needle point north?

a)

Because it is being attracted to the Geographic North Pole

b)

Because north is up

c)

Because it is being attracted to the Geographic South Pole

d)

Because north is down

36.

Can magnets interact without touching?

a)

Yes

b)

No

37.

What will the magnets in the picture do?

a)

Attract

b)

Repel

c)

Neither attract nor repel

d)

Both attract and repel

38.

What will the magnets in the picture do?

a)

Attract each other

b)

Repel each other

c)

Both attract and repel

d)

Neither attract nor repel

39.

Magnetic fields are strongest _______.

a)

at both poles

b)

at the north pole

c)

at the south pole

d)

between the poles

40.

Opposite charges _____ and like charges ____.

a)

attract, repel

b)

repel, attract

41.

When the atoms of a substance align their magnetic fields with each other, they are called ____.

a)

ferromagnetic

b)

anti-ferromagnetic

c)

a compass

d)

a lodestone

42.

What is the traditional color for North on a compass?

a)

red

b)

white

c)

blue

d)

black

43.
__________ is the angle between geographic north and the north to which a compass needle points.
a)
declination
b)
magnetic force
44.

The area of magnetic force around a magnet is known as its _____________.

a)

magnetic field

b)

magnetic declination

c)

magnetic fan lines

d)

magnetic tan lines

45.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

46.

What is the shape of a magnetic field around the Earth?

a)
b)
c)
d)
47.

Select the diagram with the weakest magnetic field

a)
b)
c)
48.
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
49.
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
50.
What two forces are required for generators and electric motors to work? 
a)
magnetism and thermal 
b)
electricity and thermal 
c)
electricity and magnetism 
d)
magnetism and radiant 
51.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
52.

In a _______ a spinning turbine moves magnets which generates an electric current.

a)

Motor

b)

Generator

53.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
54.
What energy do you put IN to a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
55.
What type of energy comes OUT of a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
56.
In an electric motor, the energy transformation begins as  ----
a)
electrical and becomes chemical
b)
mechanical and becomes electrical
c)
electrical and becomes mechanical
d)
mechanical and becomes chemical
57.

In an electric generator, the energy transformation begins as ----

a)

electrical and becomes chemical

b)

mechanical and becomes electrical

c)

electrical and becomes mechanical

d)

mechanical and becomes chemical

58.
Current that does NOT reverse direction is called ____. 
a)
magnetic current
b)
direct current
c)
circuit current
d)
alternating current
59.
Current that reverses direction in a regular pattern is called ____. 
a)
direct current 
b)
circuit current
c)
magnetic current
d)
alternating current 
60.

Magnets are made of tiny sections of magnetic fields that are aligned to produce a larger magnetic field. These are called _____.

a)

magnetic domains

b)

magnetic fields

c)

magnetic sections

d)

electromagnets

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