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magnetism General

Total questions: 112

Worksheet time: 4hrs 48mins

Name
Class
Date
1.

A magnetic field is ...

a)

A field created by a magnet

b)

A force field created by a magnet

c)

An invisible force field created by a magnet

d)

A force created by a magnet

2.

Magnetic field lines are closer together when ...

a)

Magnets are closer together

b)

The magnetic field is stronger

c)

The magnetic field is weaker

d)

Magnets repel each other

3.

A bar magnet has the strongest field ...

a)

Everywhere around the magnet is the same field strength

b)

The centre of the bar magnet makes the stronger field

c)

The poles make the strongest field

d)

The North pole only makes the strongest field

4.

Magnetic field lines coming and going

a)

Move away from North and towards South

b)

Move away from South and towards North

c)

Move away from both the North and the South

d)

Move towards both the North and the South

5.

Magnetic materials are ...

a)

Iron, Steel, Copper and Aluminium

b)

Iron, Steel, Gold and Silver

c)

Iron, Steel, Lead and Platinum

d)

Iron, Steel, Nickel and Cobalt

6.

Magnetic field lines ...

a)

Cross (intersect) each other often

b)

Cross (intersect) only at the poles

c)

Never cross (intersect) at the poles

d)

Never (cross) intersect each other

7.

To make an electromagnet stronger we need to ...

a)

Decrease voltage or number of coils or size of core

b)

Increase voltage or number of coils or size of core

c)

Increase voltage but decrease number of coils and size of core

d)

Increase number of coils but decrease number of coils and size of core

8.

Fleming's left hand rule states that ...

a)

Thumb= Current, First finger= Field and Second finger=Force

b)

Thumb= Field, First finger= Force and Second finger=Current

c)

Thumb= Force, First finger= Field and Second finger=Current

d)

Thumb= Current, First finger= Force and Second finger=Current

9.

Equations that links force, magnetic flux density, current and length is ...

a)

F = B x I x L

b)

F = B x I / L

c)

F = B / I x L

d)

F = B x L / I

10.

The motor effect is when ...

a)

A current acts on a wire

b)

A field acts on a wire

c)

A force acts on a wire

d)

A resistance acts on a wire

11.

Unit for magnetic flux density (B) is ...

a)

Newton (N)

b)

kilogram/metre3 (kg/m3)

c)

Tesla (T)

d)

Amperes (A)

12.

How will the North pole of a magnet and a iron nail react?

a)

Nothing happens

b)

Iron nail is pushed away

c)

Iron nail is rotated

d)

Iron nail is pulled towards

13.

How will the South pole of a magnet and an iron nail react?

a)

Iron nail pushed away

b)

Iron nail pulled towards

c)

Iron nail rotated

d)

Nothing happens

14.

If we increase the potential difference in an electromagnet, the magnetic field will ...

a)

Decrease

b)

Nothing happens

c)

Be zero

d)

Increase

15.

If we decrease the number of coils in an electromagnet, the magnetic field will ...

a)

Decrease

b)

Increase

c)

Become zero

d)

Nothing happens

16.

If we take out the core from an electromagnet, the magnetic field will...

a)

Become zero

b)

Nothing happens

c)

Increase

d)

Decrease

17.

A straight wire that it's coiled will ...

a)

Take less space = concentrated stronger field

b)

Take less space = weaker field

c)

Take more space = concentrated stronger field

d)

Take more space = weaker field

18.

If you approach two North poles together ...

a)

Their field lines will attract

b)

Their field lines will cancel out

c)

Their field lines will repel

d)

There will be no field lines

19.

Earth's magnetic field is created by ...

a)

Earth's gravity

b)

Earth's atmosphere

c)

Molten iron motion inside the core

d)

Earth's rotation

20.

The magnetic field around a wire is ...

a)

Circular

b)

Squared

c)

Triangular

d)

Parallel

21.

Which of these is not a magnetic material?

a)

aluminium

b)

steel

c)

nickel

d)

iron

22.

Which of the above diagrams shows the magnetic field lines around the north pole of a magnet?

a)

A

b)

B

c)

C

d)

D

23.

Which one of these could not have a magnetic field around it?

a)

Horseshoe magnet

b)

electric cable

c)

glass rod

d)

compass

24.

When magnets and metal bars are close together they experience forces.


Which row gives the correct description of the effect between these materials?

a)

A

b)

B

c)

C

d)

D

25.

A magnetic compass points North. This shows that...

a)

the Earth is tilted on its axis

b)

the Earth is spinning

c)

the Earth has a magnetic field

d)

the Earth has gravity

26.

A magnetic field line shows the direction of force acting on

a)

a magnetic north pole

b)

a magnetic south pole

c)

a bar magnet

d)

a current carrying wire

27.

A uniform magnetic field can be produced between 2 permanent magnets. Which of the following arrangements of magnets will produce the field shown?

a)

A

b)

B

c)

C

d)

D

28.

Some magnets are easily magnetised when placed in a magnetic field, and then quickly lose their magnetism once the field is removed. These materials are used in electromagnets, and are called...

a)

soft magnetic materials

b)

hard magnetic materials

c)

temporary magnets

d)

partial magnets

29.

Fleming's Left Hand Rule can be used to predict the direction of the force on a wire carrying a current, when placed in a magnetic field. Which of the above correctly identifies the fingers/thumb?

a)

A

b)

B

c)

C

d)

D

30.

The diagram shows a coil of wire with a current flowing through it in the direction shown by the arrows. The coil is between 2 magnets as shown.


Using Fleming's Left hand Rule, which way will the coil move?

a)

upwards

b)

downwards

c)

rotate clockwise

d)

rotate anticlockwise

31.

Which of these appliances does not use the effect of force on a current in a magnetic field?

a)

loudspeaker

b)

motor

c)

lightbulb

d)

electric fan

32.

The force on a wire can be made stronger in several ways. Which one of these will not work?

a)

Increase the current

b)

Use stronger magnets

c)

Use a coil with many turns

d)

Make the wire thicker

33.

If you push a metal bar quickly between 2 magnets it produces a voltage in the bar. What is this effect called?

a)

Induction

b)

Reduction

c)

Generation

d)

Production

34.

In an a.c. generator a coil is turning in between two magnets to produce a voltage to heat a resistor.


Which of the above describes the changes to the voltage produced by making the magnets stronger, and rotating the coil faster?

a)

A

b)

B

c)

C

d)

D

35.

Which of these methods will not generate a voltage?

a)

Rotate a coil in a magnetic field

b)

Rotate a magnet inside a coil

c)

Move a magnet past a wire

d)

Move a wire past a coil

36.

What does 'induction' mean?

a)

The production of a force on a conductor due to a magnetic field

b)

The production of a force on a conductor due to friction

c)

The production of a voltage in a conductor due to a magnetic field

d)

The production of a voltage in a conductor due to friction

37.

The image shows an aluminium rod placed between 2 magnets.


How can a voltage be induced in this rod between the ends labelled A and B?

a)

Replace the north pole with another south pole

b)

Change the aluminium rod for a copper rod

c)

Move the rod upwards or downwards

d)

Heat the rod

38.

A magnet is dropped through a coil connected to a millivoltmeter as shown. The voltmeter needle moves to the right showing a positive reading.


Which of these will make the voltmeter reading smaller but still positive?

a)

Drop the south pole through first

b)

Add more turns to the coil

c)

Move the magnet slowly through the coil

d)

Use a stronger magnet

39.

A magnet is dropped through a coil connected to a millivoltmeter as shown. The voltmeter needle moves to the right showing a positive reading.


Which of these will make the voltmeter move to the left?

a)

Drop the south pole through first

b)

Add more turns to the coil

c)

Move the magnet slowly through the coil

d)

Use a stronger magnet

40.

A device that uses sound waves to move a coil can induce a small voltage signal in an external circuit that represents the sound. It is converting the energy in sound waves into electrical energy.


What is the name given to this device?

a)

A loudspeaker

b)

A dynamo

c)

A generator

d)

A microphone

41.

The national grid uses step-up transformers to produce very high voltages in long cables that link towns and cities. Why is this?

a)

People are less likely to steal the electrical energy because it is dangerously high voltage.

b)

The transformers step up the power delivered by the same ratio as the step up in voltage.

c)

Houses and offices need this very high voltage to operate

d)

Less current is needed, and therefore there is less power loss in the cables.

42.
A balloon is rubbed all over with wool.  The balloon will now attract wool because the balloon and wool
a)
are magnets
b)
have opposite charges
c)
have like charges
d)
have neutral charges
43.
In a static discharge, which particles move from one object to another?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
44.
Which of the following could be used as the core of a simple electromagnet?
a)
drinking straw
b)
iron nail 
c)
a soda bottle
d)
an ink pen
45.
A piece of nickel will be attracted to
a)
only the north pole of an electromagnet
b)
only the south pole of an electromagnet
c)
either pole of an electromagnet
d)
the iron core of an electromagnet
46.
What is voltage?
a)
a measure of electric current
b)
a kind of static elecricity
c)
a kind of current electricity
d)
a measure of potential energy difference
47.
Which of these in an insulator?
a)
a copper wire
b)
a silver spoon
c)
a plastic coating on a wire
d)
an aluminum coating on a wire
48.
What is the purpose of a switch in an electric circuit?
a)
to allow the circuit to be opened or closed
b)
to change the direction of the current
c)
to provide a push for the current
d)
to increase the electric power to the load
49.
What is the purpose of an electric motor?
a)
to convert electrical energy to mechanical energy
b)
to convert chemical energy to electrical energy
c)
to convert mechanical energy to electrical energy
d)
to convert mechanical energy to heat energy
50.
Electric current flowing through a wire produces
a)
static electricity
b)
an open circuit
c)
a permanent magnet
d)
a magnetic field
51.
What is the purpose of an iron core in an electromagnet?
a)
to hold the loops of wire in place
b)
to make the magnetic force stronger
c)
to change the direction of the electric current
d)
to change the direction of the magnetic force
52.
Each time a lightbulb is added to a series circuit, the other bulbs in the circuit 
a)
get brighter
b)
get dimmer
c)
stay the same brightness
d)
release more heat
53.
A group of lights are connected in a parallel circuit.  One of the lights is removed.  The rest of the lights will
a)
get brighter
b)
get dimmer
c)
go out
d)
not change
54.
A scientist observed that the needle of a compass moved when it was placed near a wire carrying an electric current.  What did this observation show?
a)
Opposite charges attract.
b)
Electric current generates a magnetic field.
c)
Magnetized wires generate electricity.
d)
Like charges repel.
55.
Two lightbulbs are connected to an energy source by two loops.  What is this setup an example of?
a)
a parallel circuit
b)
a static discharge
c)
a series circuit
d)
an electromagnet
56.
A student is investigating how changing the size of the core of an electromagnet affects its strength.  Which of these is most likely the dependent variable in the student's investigation?
a)
the number of wire coils wrapped around the core
b)
the number of paper clips picked up by the electromagnet
c)
the voltage of the battery used in the circuit
d)
the size of the piece of iron used as the core
57.
A magnet will pick up a nail, but not a penny because the nail
a)
has rust on it.
b)
is lighter than the penny.
c)
has a sharp point.
d)
contains iron.
58.
Which is NOT a use of magnets?
a)
Generating electricity
b)
Holding cabinet doors closed
c)
Sorting paper from plastic
d)
Storing information on computer hard drives.
59.
The magnet's shown will
a)
not move
b)
attract
c)
repel
d)
all of the above
60.
The magnet's shown will
a)
not move
b)
attract
c)
repel
d)
all of the above
61.
Magnets attract things made of
a)
copper
b)
iron
c)
wood
d)
plastic
62.
All magnets have 2
a)
fields
b)
colors
c)
poles
d)
all of the above
63.
The two poles on a magnet are
a)
north and east
b)
north and west
c)
south and north
d)
south and west
64.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
65.

The Earth has a magnetic field.

a)

True

b)

False

66.
Earth acts like a giant magnet because its center is made up MOSTLY of
a)
granite
b)
limestone
c)
iron
d)
nickel
67.
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
68.
The force of magnetism is stronger when magnets are ________________
a)
cold
b)
round
c)
closer together
d)
farther apart
69.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
70.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
71.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
72.
Iron and steel can become _____.
a)
magnetized
b)
transformed into plastics
c)
lined up to the poles
d)
part of the equator
73.
A simple electromagnet can be made with which of the following?
a)
an electric current
b)
a turbine and nail
c)
a nail, a wire, and a battery
d)
a compass and a battery
74.
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
75.
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
76.

What device takes in mechanical energy and produces electricity?

a)

motor

b)

generator

c)

electromagnet

d)

battery

77.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
78.
Magnets have a north and a south ___________
a)
shape
b)
color
c)
pole
d)
region
79.
What do magnets stick to?
a)
copper
b)
wood
c)
iron
d)
plastic
80.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
81.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
82.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
83.
What is responsible for the Magnetic Field around Earth?
a)
The Earth's crust
b)
The Earth's molton iron core
c)
The Earth's mantel
d)
The Sun
84.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
85.

What causes magnetism?

a)

the sun

b)

moving neutrons

c)

moving charges

d)

friction

86.
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
87.
A north pole and a south pole will attract.
a)
True
b)
False
88.
A paper clip is an example of a:
a)
magnetic material
b)
permanent magnet
c)
bar magnet
d)
insulator
89.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
90.
Two south poles will...
a)
attract
b)
repel 
91.
Magnets that are arranged like this will _______. 
a)
move away from each other (repel)
b)
move towards each other (attract)
92.
Magnets will stick to refrigerator doors because the doors are 
a)
Painted with plastic.
b)
Made of metal.
c)
Easy to open. 
d)
Heavy.
93.
Which of these is attracted to a magnet?
a)
iron nail
b)
copper penny
c)
piece of paper
d)
notebook
94.

What happens in an electromagnet?

a)

Mechanical energy produces an electric field

b)

Mechanical energy transforms into electrical energy

c)

Electrical energy produces a magnetic field

d)

Electrical energy transforms into mechanical energy

95.

What causes magnetism?

a)

the sun

b)

moving neutrons

c)

moving charges

d)

friction

96.

Which of the following is NOT naturally magnetic?

a)

iron

b)

copper

c)

nickel

d)

cobalt

97.

Which drawing is correct?

a)

1

b)

2

c)

3

d)

4

98.

Where is the magnetic field strongest around a bar magnet?

a)

in the middle

b)

at the poles

c)

same everywhere

d)

where the field lines are far apart

99.

How can a wire become magnetic?

a)

point it north

b)

add a resistor

c)

heat it up

d)

run a current through it

100.

Which direction do the arrows point when representing the magnetic field around a magnet?

a)

into N

b)

out of S

c)

into S

d)

out of N

101.

What is this?

a)

electromagnet

b)

permanent magnet

c)

motor

d)

generator

102.

What does the direction of the pointing fingers mean in this picture?

a)

the direction of the voltage

b)

the rotation of the wire

c)

the direction of the magnetic field

d)

the direction of the current

103.

How could you make a stronger electromagnet?

a)

more coils of wire

b)

add an iron core

c)

more current in the wire

d)

all three

104.
a)

one N and one S

b)

both N

c)

both S

d)

each piece still has a N and S

105.

What experiences a magnetic force in a magnetic field?

a)

a charge

b)

a moving object

c)

a moving charged object

106.

What experiences a magnetic force in a magnetic field?

a)

a wire

b)

a length of wire

c)

a electrical current in wire

107.

Is this material a magnet or just magnetic?

a)

just magnetic

b)

a magnet

c)

both

d)

neither

108.

What device takes in mechanical energy and produces electricity?

a)

motor

b)

generator

c)

electromagnet

d)

battery

109.

What are the microscopic regions of atoms with a commonly aligned magnetic field called?

a)

micromagnets

b)

amps

c)

magnetic zones

d)

magnetic domains

110.

What type of energy goes into a motor?

a)

thermal

b)

radiant

c)

mechanical

d)

electrical

111.

F = BIL If the current and magnetic field are doubled, the magnetic force on the wire

a)

halves

b)

remains the same

c)

doubles

d)

quadruples

112.

F = qvB If the speed and charge double, what happens to the magnetic force?

a)

halves

b)

remains the same

c)

doubles

d)

quadruples

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