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Worksheets

Module review: E&M

Total questions: 78

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
What subject is attracted to a magnet?
a)
Silver
b)
Water
c)
Metal
d)
Iron
2.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
3.
A north pole and a south pole will attract.
a)
True
b)
False
4.
True or False: All metals stick to magnets.
a)
True
b)
False
5.
True or False:
Most rocks are magnetic.
a)
True
b)
False
6.
True or False:
A magnet wrapped in cloth will attract paper clips.
a)
True
b)
False
7.
What do magnets stick to?
a)
copper
b)
wood
c)
iron
d)
plastic
8.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
9.
When two magnets attract, they ______________
a)
push apart
b)
change color
c)
get colder
d)
pull together
10.
When two magnets repel, they ________________
a)
change color
b)
pull together
c)
push apart
d)
get colder
11.
The force of magnetism is stronger when magnets are ________________
a)
cold
b)
round
c)
closer together
d)
farther apart
12.

Objects that are attracted to each other are called

a)

Nonmagnetic objects

b)

Metal

c)

Magnetic Objects

d)

Electric Objects

13.

If you put a magnet with two of the same poles near each other, they...

a)

attract (move closer)

b)

repel (move away)

14.

If you put a magnet with two different poles together, they...

a)

repel (move away)

b)

attract (move closer)

15.

Magnets can pull on things without touching them.

a)

True

b)

False

16.

When iron touches a magnet, it becomes a magnet too.

a)

True

b)

False

17.

Mrs. Davis rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

a)

The balloons will repel each other.

b)

The balloons will attract each other.

c)

The balloons will become positively (+) charged.

d)

The balloons will pop.

18.
If an object has the same number of positive and negative charges, its electrical charge is...
a)
positive
b)
negative
c)
neutral or no charge
d)
opposite
19.
The girl's hair and the comb are attracting  one another.  The hair and the comb have
a)
opposite charges
b)
like charges
20.

If two charges repel each other, the two charges must be

a)

Positive and neutral

b)

Positive and negative

c)

positive and neutral

d)

negative and negative

21.
If an object has more positive than negative charges, its electrical charge is...
a)
positive
b)
negative
c)
neutral or no charge
d)
opposite
22.
Static means...
a)
not moving
b)
moving slowly
c)
moving quicky
23.

Will the balloons ATTRACT or REPEL each other?

a)
b)
24.
Charging by Friction results in two objects with the same charge.
a)
True
b)
False
25.

A material that does NOT let electricity pass through it is called ...

a)

An electrical conductor

b)

An electrical insulator

c)

An electrical source

d)

An electric appliance

26.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

27.
An incomplete circuit is shown.
To complete the circuit, a wire should be placed from —
a)
Point D to Point C
b)
Point B to Point C
c)
Point A to Point D
d)
Point B to Point D
28.
Which of the following can work as an energy source?
a)
Battery
b)
Light bulb
c)
Wire
d)
All of them
29.
Which bulbs will light?
a)
1 and 2
b)
2 and 3
c)
3 and 4
d)
4 and 2
30.
Choose the correct sentence.
a)
This circuit will work because it is an open circuit.
b)
This circuit will work because it is a closed circuit.
c)
This circuit will NOT work because it is an open circuit.
d)
This circuit will NOT work because it is a closed circuit.
31.

Why is electrical wiring usually covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

32.
Which of these materials is a good insulator?
a)
Plastic and metal
b)
Metal and rubber
c)
Plastic and rubber
33.
What is the function of the light bulb in a circuit?
a)
It increases the strength of the electricity.
b)
It changes electricity to light energy.
c)
It provides electricity to the battery.
d)
It opens and closes the circuit.
34.

The circuit on the left is not complete (the light is off) because:

a)

the switch is closed

b)

the switch is open

c)

the battery is missing

d)

the battery is in backwards

35.

What type of circuit is shown in the picture?

a)

Series Circuit

b)

Broken Circuit

c)

Parallel Circuit

d)

Open Circuit

36.

This steel paperclip would allow electricity to flow through it because:

a)

it is a conductor

b)

it is an insulator

c)

it is friendly

d)

it breaks the circuit

37.

This rubber ducky would block the flow of electricity, because:

a)

it is a conductor

b)

it is an insulator

c)

it is yellow

d)

it completes the circuit

38.
What kind of circuit is this?
a)
series
b)
parallel
39.
The circuit that has only one path for electricity to travel around.
a)
parallel circuit
b)
series circuit
c)
no circuit
40.

The act of going around. A system that connects electrical devices so they will operate is?

a)

skeleton

b)

volt

c)

circuit

d)

filament

41.
A unit used to measure the electric potential of a battery is called...
a)
current
b)
electricity
c)
volt
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.

Resistance is a measure of...

a)

the number of terminals

b)

how hard it is for electrons to move through the battery

c)

how hard it is for electrons to move through the circuit

d)

how many volts are in the battery

44.

A type of magnet that has temporary magnetic effect when electric current flows through it.


This refer to

a)

Electric

b)

Electronic

c)

Electrostatic

d)

Electromagnet

45.

Magnetic field near to the wire is stronger.

a)

True

b)

False

46.

When more current flows in solenoid, strength of magnetic field ...

a)

Decrease

b)

Increase

47.
What is an electromagnet?
a)
a temporary magnet made from current carrying wire around a magnetic metal core.
b)
a permanent magnet with a north and south pole
48.
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
49.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
50.
While electric current is flowing through a wire, what surrounds the wire?
a)
a magnetic field
b)
a glowing light
c)
neutrons
d)
protons
51.
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
52.
  You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
53.

Using a _________ __________in the core will make a stronger electromagnet.

(a)  

54.

A current flowing through a wire produces a _______ ______.

(a)  

55.

The magnetic field around an electromagnet is similar to that around a _____ _____

a)

Bar magnet

b)

Horseshoe magnet

c)

Ring Magnet

d)

Button magnet

56.

The iron core remains magnetised when you turn the current off.

a)

True

b)

False

57.

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

58.
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
59.

Magnetic field in the middle of two coils is

a)

Stronger

b)

Weaker

60.

Thumb shows the direction of

a)

Magnetic field

b)

Current

61.

Direction of current in the wire is

a)

Upwards

b)

Downwards

62.

Thumb shows the direction of

a)

Magnetic field

b)

Current

63.

When _______________ travels through a

conductor, a magnetic field is created

a)

current

b)

a magnetic field

c)

neutrons

64.

Electric currents produce _____________

a)

electron clouds

b)

magnetic fields

c)

sound waves

65.

In magnets and electromagnets, similar poles attract

a)

true

b)

false

66.

In magnets and electromagnets, dissimilar (opposite) poles attract

a)

true

b)

false

67.

The object inside a radio that makes a speaker work is called a(n) ______________________

a)

electromagnet

b)

permanent magnet

c)

electron cloud

68.

In a battery, electrons collect at the __________________ end of the battery.

a)

positive

b)

middle

c)

negative

69.

Electrons which collect at the negative end of the battery, can flow to the positive end through a ___________________

a)

wire

b)

electron cloud

c)

magnet

70.

When the strength of the magnetic field changes, the ________________________between the coil and the permanent magnet changes.

a)

attractive force

b)

polarity

c)

wire

71.

A magnet is defined as

a)

the force between two opposite poles

b)

any material that has a magnetic field

c)

the electron cloud surrounding an object

72.

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

73.

Which of the following principles explains how an electric motor works?

a)

Magnetic force

b)

Magnetism

c)

Electrolysis

d)

Electromagnetism

74.

What would happen to the coiled wire in an electric motor model if there are repulsion and attraction of the magnetic poles?

a)

The coil fluctuates and converts electrical energy into chemical energy.

b)

The coil stops and changes mechanical (kinetic) energy into electrical energy.

c)

The coil rotates and changes electrical energy into mechanical (kinetic) energy.

d)

The coil remains unstable.

75.

Why might a current-carrying wire be placed between a magnetic field?

a)

To increase the current from the interaction of magnetic fields

b)

To increase the voltage from the interaction of magnetic fields

c)

To produce a force from the interaction of magnetic fields

76.

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

a)

180

b)

45

c)

90

d)

270

77.

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

a)

Gravity

b)

Magnetic flux density/size of magnetic field

c)

Size of the current

d)

Length of the conductor

78.

Give two ways you can reverse the direction of a basic dc motor?

a)

Reverse the current

b)

Keep the current the same

c)

Reverse the magnetic field

d)

Keep the magnetic field the same

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