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Unit 5: Electric/Magnetic Forces

Total questions: 63

Worksheet time: 55mins

Name
Class
Date
1.
Magnetism is....
a)
The part of the magnet where the force is the strongest
b)
A force created by magnets that pulls some metals
c)
To Pull towards
d)
An object able to pull some metals towards itself
2.
Poles are ....
a)
The part of the magnet where the force is the strongest
b)
A force created by magnets that pulls some metals
c)
To Pull towards
d)
An object able to pull some metals towards itself
3.
Do these magnets attract or repel? 
a)
Attract
b)
Repel
4.
Do these magnets attract or repel?
a)
Attrack
b)
Repel
5.
How is a permanent magnet DIFFERENT from a temporary magnet?
a)
A permanent magnet attracts materials made of iron.
b)
A permanent magnet has poles.
c)
A permanent magnet has a magnetic field.
d)
A permanent magnet keeps its magnetism for a long time.
6.
True or False: All metals stick to magnets.
a)
True
b)
False
7.
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
8.
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
9.
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
10.
This large crane magnet functions only when the electrical current is ON.  The crane magnet is an example of what type of magnet?
a)
NIB Magnet
b)
Ceramic Magnet
c)
Electromagnet
d)
funnel magnet
11.
Iron, Nickel and cobalt are all __________________ materials
a)
Shiny
b)
poles
c)
magnetic
d)
cold
12.
Which of the following is true of 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.
13.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
14.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
15.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
16.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
17.

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

a)

The magnetic field

b)

The electrostatic field

c)

The piezoelectric effect

d)

The chemical reaction of the magnet and the filings

18.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
19.
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
20.
What is the metal center of an electromagnet called?
a)
The current
b)
the wire
c)
the coil
d)
the core
21.
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
22.
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.
23.

Which of the following is NOT needed for an electromagnet?

a)

Wire

b)

Iron core (like a bolt)

c)

Switch

d)

Power source

24.

Using more coils increases the strength of the electromagnet.

a)

true

b)

false

25.
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
26.
What is one difference between electromagnets and bar magnets?
a)
Bar magnets can be turned off but electromagnets cannot
b)
Electromagnets need electricity but bar magnets do not
c)
Bar magnets have a magnetic field but electromagnets do not
d)
Bar magnets are bigger than electromagnets
27.
Electromagnets can be found in...
a)
Doorbell
b)
Computer drive
c)
Electric train
d)
All of them 
28.
What are the advantages of using electromagnets?
a)
They can be turn on and off
b)
Their strength can be controlled
c)
Their polarity can be reversed
d)
All of them 
29.
What does a motor do?
a)
Moves up and down
b)
Rotates without Electricity 
c)
It does
d)
Uses Electricity to rotate
30.
If the end of an unknown magnet sticks to a magnet pole labeled "North" the unknown end must be...
a)
North
b)
South
c)
East 
d)
West
31.
A Magnet can be used to create electricity
a)
True
b)
False
32.
Electricity can be used to create a magnet
a)
True
b)
False
33.
Electricity & Magnetism are interconnected
a)
True
b)
False
34.
You can make an electromagnet stronger by...
a)
increasing the current through the wire
b)
make the iron core bigger
c)
increase the number of loops around the core
d)
All of these
35.
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
36.

Which drawing is correct?

a)

1

b)

2

c)

3

d)

4

37.
a)

one N and one S

b)

both N

c)

both S

d)

each piece still has a N and S

38.

What is the function of a switch in an electric circuit?

a)

To allow electrons to flow or stop flowing through the circuit

b)

To allow protons to flow through the circuit

c)

To allow atoms to flow through the circuit

d)

To produce electricity

39.
Which is an advantage of a parallel circuit over a series circuit?
a)
If one bulb goes out, the other stays lit.
b)
The bulbs get dimmer as you add more.
c)
If one bulb goes out, all go out.
d)
It is prettier.
40.
Will this configuration of a complete circuit light a bulb?
a)
yes
b)
no
41.
Will this configuration of a complete circuit and light a bulb?
a)
yes
b)
no
42.
This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -
a)
the switch gives energy to the battery
b)
the buzzer is made of special plastic
c)
the wires are cooled by the surrounding air
d)
electricity can flow in a complete path
43.
When all parts of the circuit are connected it is a ______ circuit. 
a)
open
b)
closed
44.
The flow of electrical energy starts at the  ___ side of the d-cell.
a)
negative
b)
positve
c)
complete circuit
d)
bulb
45.
Which subatomic particle has a negative charge?
a)
Proton
b)
Neutron
c)
Electron
46.
This is the symbol for a _____?
a)
Lamp
b)
Water wheel
c)
Loudspeaker
d)
Motor
47.
This is the symbol for a ...
a)
Wire
b)
Battery
c)
Buzzer
d)
Fuse
48.

what is this symbol for?

a)

light bulb

b)

single cell battery

c)

double cell battery

d)

resistor

49.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
50.
Which of the two circuits would have the brightest bulbs? 
a)
A
b)
B
51.
What kind of circuit is this?
a)
series
b)
parallel
52.
Which of the following answer choices correctly describes the image? 
a)
Series circuit - Bulbs are lit
b)
Series circuit - Bulbs are off
c)
Parallel circuit - Bulbs are lit
d)
Parallel circuit - Bulbs are off
53.
a)
Bulbs are in parallel - Circuit X is brighter than Circuit Y
b)
Bulbs are in parallel - Circuit Y is brighter than Circuit X
c)
Bulbs are in series - Circuit X is brighter than Circuit Y
d)
Bulbs are in series - Circuit Y is brighter than Circuit X
54.

This circuit does not work because…

a)

the bulbs are not connected properly

b)

two battery cells are not powerful enough

c)

there is a break in the circuit

d)

the battery cells are facing each other (- to -)

55.
a)
all bulbs are lit equally
b)
the two top bulbs are brighter
c)
the single lower bulb is brighter
d)
the single bulb does not light and the other two are dim
56.
A class prepared some electrical circuits using battery, connecting wires, and three light bulbs.  Which of these circuits can make the three bulbs light?
a)
A
b)
B
c)
C
d)
D
57.

Which switch, when opened, will make the light go out?

a)

Q

b)

R

c)

S

d)

T

58.

This type of magnet can be turned on and off.

a)

horseshoe magnet

b)

electromagnet

c)

fridge magnet

d)

any magnet

59.

How do you increase the strength of an electromagnet?

a)

add more magnets

b)

larger core

c)

increase the number of coils around the core

d)

salt water

60.

True or false: All magnets are electromagnets.

a)

True

b)

Fasle

61.

True or False: When energy is flowing through a wire a magnetic field is created.

a)

True

b)

False

62.

Like regular magnets, electromagnets have a...

a)

north and south pole

b)

a charge

c)

power

d)

consistent magnetic field

63.

How can the strength of an electromagnet be increased? (mark all that apply)

a)

increase the current flowing through the coil

b)

increase the number of coils

c)

add an amplifier to it

d)

put iron core inside the coil

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