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Magnets

Total questions: 31

Worksheet time: 20mins

Name
Class
Date
1.

Look at the picture carefully.

Which screws will be attracted?

a)

iron and steel screws

b)

iron and aluminum screws

c)

steel and aluminum screws

d)

all screws

2.

What would happen when two north poles of magnets are placed together?

a)

The force will pull them together (attract).

b)

The force will push them away from each other (repel).

c)

The strength of the magnet is doubled.

3.

What would happen when the opposite poles of magnets are placed together?

a)

The force will pull them together (attract).

b)

The force will push them away from each other (repel).

c)

The strength of the magnet is doubled.

4.

True or False: All metals are attracted to magnet.

a)

True

b)

False

5.

Where is the force of attraction the strongest on a magnet?

a)

above the magnet

b)

below the magnet

c)

at the poles

d)

in the middle

6.

What do the lines around this magnet represent?

a)

North Pole

b)

South Pole

c)

Magnetic Declination

d)

Magnetic Field

7.

If you cut a magnet in half, what happens to the poles?

a)

One half gets the North Pole, the other half gets the South Pole.

b)

Both halves get only a South Pole.

c)

Both halves get only a North Pole.

d)

Both halves get a North pole and a South Pole.

8.

What is responsible for the Magnetic Field around Earth?

a)

The Sun

b)

The Earth's core

c)

The Earth's crust

d)

The Earth's mantle

9.

Which of these materials would be attracted to a magnet?

a)

copper

b)

aluminum

c)

cobalt

d)

iron

10.

Magnetism is a _________ force

a)

non-contact

b)

contact

c)

chemical

d)

biological

11.

Unlike (opposite) poles _____, like (same) poles _____

a)

repel, attract

b)

connect, repel

c)

attract, repel

d)

repel, connect

12.

Which object would a magnet attract?

a)

a glass bottle

b)

a piece of paper

c)

a steel paper clip

d)

a rubber eraser

13.

A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.

a)

calculator

b)

ruler

c)

compass

d)

map

14.
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).
15.
The needle of a compass always points _________________________.
a)
at the equator
b)
North
c)
South
d)
What's a compass?
16.
Which of the following is true about a bar magnet?
a)
Its magnetic field is strongest near its center.
b)
It is surrounded by a magnetic field.
c)
The north pole is stronger than the south pole.
d)
The south pole is stronger than the north pole.
17.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
18.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
19.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
20.
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.
21.
The strength of a magnet can be changed by
a)
adding less loops to the coil.
b)
adding more loops to the coil.
22.

In order to magnetize an object for electromagnetism, it needs to have iron or steel (ex. a rod or nail).

a)

True

b)

False

23.

Electromagnets can be turned on and off.

a)

True

b)

False

24.

Electromagnets need a power source.

a)

True

b)

False

25.

What are the components of the electromagnets?

a)

battery, wire and bulb

b)

battery , copper wire and paper clips

c)

battery, copper wire and iron nail

d)

battery, wire and aluminum

26.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
27.
What would increase the strength of an electromagnet?
a)
Increasing the amount of current flowing through the wire.
b)
Inserting a wooden core inside the coil
c)
Changing the direction of the current
d)
Decreasing the number of coils of wire
28.
  You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
29.

Most cores are made of _______.

a)

Iron

b)

Copper

c)

Aluminum

d)

Wood

30.

which one is the strongest eletromagnet?

a)

50 turns on the coil, low current,

copper core

b)

100 turns on the coil,

high current,

iron core

c)

50 turns on the coil, low current,

iron core

d)

100 turns on the coil,

low current,

iron core

31.
The strength of the magnetic field of a electromagnet can be increased by
a)
Decreasing the number of coils.
b)
Increasing the number of coils
c)
Decreasing the current
d)
Increasing the resistance

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