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Year 11 Physics Elec mag rev.

Total questions: 196

Worksheet time: 2hrs 20mins

Name
Class
Date
1.

What is the process called when a magnet moves into a coil of wire?

a)

Electromagnetic deduction

b)

Mr Davies effect

c)

Electromagnetic induction

d)

Magnetic friction

2.

How would you increase the induced voltage in this circuit? (Could be more than one answer)

a)

Move the magnet faster

b)

Move the magnet slower through the coil

c)

Turn the magnet to the opposite direction

d)

More turns to the coil

e)

Stronger Magnet

3.

Choose what the forefinger represents in Flemings left hand law.

a)

Field (South to North)

b)

Force

c)

Field (North to South)

4.

What do field line patterns show?

a)

The direction of the magnetic field

b)

The direction and shape of the magnetic field

c)

The shape of the magnetic field

d)

None of the above

5.

What advantage does an electromagnet have over a magnet?

a)

Stronger

b)

You can turn it off and on

c)

It attracts chocolate

6.

What causes the motor effect?

a)

A current carrying wire exerting a force on an electromagnet

b)

A current carrying wire exerting a force on a temporary magnet

c)

A current carrying wire exerting a force on a permanent magnet

7.

What do speakers contain?

a)

Magnet

b)

Magnet and electromagnet

c)

Electromagnet

8.

What is the process called when a magnet moves into a coil of wire?

a)

Electromagnetic deduction

b)

Mr Fleming's effect

c)

Electromagnetic induction

d)

Magnetic friction

9.

How would you increase the induced voltage in this circuit? (Could be more than one answer)

a)

Move the magnet faster

b)

Move the magnet slower through the coil

c)

Turn the magnet to the opposite direction

d)

More turns to the coil

e)

Stronger Magnet

10.

Choose what the forefinger represents in Flemings left hand law.

a)

Field (South to North)

b)

Force

c)

Field (North to South)

11.

What do field line patterns show?

a)

The direction of the magnetic field

b)

The direction and shape of the magnetic field

c)

The shape of the magnetic field

d)

None of the above

12.

What advantage does an electromagnet have over a magnet?

a)

Stronger

b)

You can turn it off and on

c)

It attracts chocolate

13.

What produces this shape field?

a)

Bar magnet

b)

Straight wire

c)

Flat coil

d)

Solenoid

14.

This is the shape of the field around a..

a)

bar magnet

b)

straight wire

c)

flat circular coil

d)

solenoid

15.

What is required to make an electromagnet

a)

power supply

b)

coil of insulated wire

c)

magnetic core

d)

switch

16.

The field shape around an electromagnet is the same shape as around a..

a)

bar magnet

b)

horseshoe magnet

c)

straight wire

17.

How can you change the direction of the field in a solenoid?

a)

Change the number of coils

b)

Change the size of the current

c)

Change the direction of the current

d)

Use a soft iron core

18.

The field lines inside an electromagnet

a)

are weakest

b)

go from south to north

c)

are spread out

d)

go from north to south

19.

What does not affect the power of an electromagnet?

a)

Number of coils

b)

size of the current

c)

having a soft iron core

d)

how close together the coils are

20.

When you bring iron near an electromagnet it

a)

becomes magnetised

b)

becomes a magnet

c)

repels other iron

d)

is still magnetised after the current is switched off

21.

If place unmagnetised steel near an electromagnet with a soft iron core it will..

a)

be repelled

b)

not be attracted

c)

remain attached after the current is switched off

d)

fall off when the current is switched off

22.

When you increase the current in a solenoid the field lines inside the solenoid...

a)

change direction

b)

are no longer uniform

c)

get further apart

d)

get closer together

23.

Electrons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

24.

A current is produced when _______________ flow in a circuit.

a)

protons

b)

neutrons

c)

electrons

d)

nucleons

25.

What happens when an electric current flows through a wire?

a)

The wire begins to spin.

b)

Nothing happens.

c)

A field of gravity is created around the wire.

d)

A magnetic field is created around the wire.

26.

Electric current is measured in ____________.

a)

Newtons (N)

b)

Amperes (A)

c)

Hertz (Hz)

27.

The south ends of two magnets will _________ each other.

a)

repel

b)

attract

28.

________________ are the attractive and repulsive forces between two poles.

a)

Magnetic forces

b)

Electric forces

c)

Magnetic charges

d)

Electric charges

29.

What does this image show?

a)

Parallel circuit

b)

Series circuit

c)

Magnet

d)

Electromagnet

30.

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

a)

magnetism

b)

magnetic current

c)

magnetic field

d)

electric current

31.

How do you increase the strength of an electromagnet?

a)

Add a motor and/or light bulbs

b)

Add more light bulbs and wire coils

c)

Add more wire coils

d)

Increase the voltage

32.

A _______________ is a current-carrying coil of wire with many loops.

a)

magnet

b)

electromagnet

c)

solenoid

d)

compass

33.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

a)

decrease

b)

increase

c)

not affect

34.
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
35.

What would happen with the magnets in the picture above?

a)

They would repel

b)

Nothing

c)

They would attract

d)

They would repel and then attract

36.

What is induced when a wire is carrying a current?

a)

Electricity

b)

Electrons

c)

A Magnetic Field

d)

A Voltage

37.

Using the right-hand curl, how would you draw the magnetic field around this wire? The direction of current is drawn for you.

38.

What can increase the strength of the magnetic field at a single point near a current carrying wire?

a)

Increasing the length of the wire.

b)

Increasing the width (diameter) of the wire.

c)

Increasing the current (moving electrons) through the wire.

d)

Changing the material of the wire.

39.

V = I ×R V\ =\ I\ \times R\   [Voltage = Current X Resistance]

If the resistance of a wire is constant (it mostly is), what will happen to the current if the voltage increases?

a)

Current increases.

b)

Current decreases.

c)

Current stays the same.

d)

Current flows in the opposite direction.

40.

What is this coil of current-carrying wire called?

a)

Oculoid

b)

Spiraloid

c)

Colloid

d)

Solenoid

41.

How does a solenoid increase the magnetic field around the wire?

a)

Allows a higher voltage.

b)

Allows a higher current.

c)

Brings field around the wire closer together.

d)

Decreases resistance in the wire.

42.

What do magnetic fields do to other magnetic fields?

a)

Attract or Repel

b)

Attract

c)

Repel

d)

Nothing

43.

For magnetic fields to pull or push objects away, there must be...

a)

friction.

b)

resistance.

c)

current.

d)

a force.

44.

What would happen to this current carrying wire in the middle of an external magnetic field?

a)

It would experience a force.

b)

It would heat up.

c)

It would break.

d)

Nothing.

45.

A motor works by putting a coil of wire in a magnetic field. The loop of wire rotates inside the field when it is carrying a current. What might happen if the wires were held in place?

a)

The wire will twist and get tangled.

b)

Nothing.

46.

What is the purpose of a split-ring commutator?

a)

Decreases heat in the wire.

b)

Increases the voltage into the wire.

c)

Current flows through commutator without going through the wire.

d)

Current flows through wire and rotates without getting tangled.

47.

Which of the following is not a subatomic particle that makes up an atom?

a)

neutron

b)

proton

c)

nucleon

d)

electron

48.

Protons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

49.

Electrons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

50.

A charged atom is called a(n) __________.

a)

proton

b)

neutron

c)

electron

d)

ion

51.

A current is produced when _______________ flow in a circuit.

a)

protons

b)

neutrons

c)

electrons

d)

nucleons

52.

What happens when an electric current flows through a wire?

a)

The wire begins to spin.

b)

Nothing happens.

c)

A field of gravity is created around the wire.

d)

A magnetic field is created around the wire.

53.

Electric current is measured in ____________.

a)

Newtons (N)

b)

Amperes (A)

c)

Hertz (Hz)

54.

The south ends of two magnets will _________ each other.

a)

repel

b)

attract

55.

________________ are the attractive and repulsive forces between two poles.

a)

Magnetic forces

b)

Electric forces

c)

Magnetic charges

d)

Electric charges

56.

What does this image show?

a)

Parallel circuit

b)

Series circuit

c)

Magnet

d)

Electromagnet

57.

Opposite charges do what?

a)

Attract

b)

Repel

58.

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

a)

magnetism

b)

magnetic current

c)

magnetic field

d)

electric current

59.

How do you increase the strength of an electromagnet?

a)

Add a motor and/or light bulbs

b)

Add more light bulbs and wire coils

c)

Add more wire coils

d)

Increase the voltage

60.

What is/are the difference(s) between a magnet and an electromagnet?

a)

An electromagnet can be turned on/off.

b)

A magnet can be turned off.

c)

An electromagnet is stronger.

61.

A _______________ is a current-carrying coil of wire with many loops.

a)

magnet

b)

electromagnet

c)

solenoid

d)

compass

62.

How can a magnet be used to produce an electric current?

a)

Hold a magnet next to a piece of wire.

b)

Wrap wire around a magnet.

c)

Spin the magnet around inside a coil of wire.

63.

A _____________ transforms mechanical energy into electrical energy.

a)

generator

b)

electromagnet

c)

circuit

d)

magnetic field

64.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

a)

decrease

b)

increase

c)

not affect

65.

What three minerals are attracted to a magnet?

a)

Gold, copper, cobalt

b)

Cobalt, aluminum, silver

c)

Iron, copper, aluminum

d)

Iron, nickel, cobalt

66.

An atom becomes _______ when it gains electrons.

a)

Positive

b)

Neutral

c)

Negative

d)

Invisible

67.
An electric current can produce a magnetic field.
a)
True 
b)
False
68.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits
69.
Magnets have two poles. What are they?
a)
North and South
b)
East and West
c)
Top and Bottom
70.
Magnetism is a force that __________.
a)
freezes matter
b)
pushes or pulls
c)
expands and contracts
71.
Choose the one that correctly describes magnetism.
a)
Like poles of a magnet attract, while opposite poles repel.
b)
Like poles of a magnet expand, while opposite poles contract
c)
Like poles of a magnet repel, while opposite poles attract.
d)
Like poles of a magnet contract, while opposite poles expand.
72.
Which of the following conducts electricity?
a)
aluminum foil
b)
wood
c)
rubber band
73.
What is the name for the type of electricity that happens when you drag your feet on the carpet and shock your friend?
a)
current electricity
b)
magnetic electricity
c)
static electricity
74.
Which are all examples of electromagnets found in your house?
a)
shower, toothbrush, front door
b)
washing machine, blender, vacuum cleaner
c)
window shades, beach towel, bicycle
75.
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
76.

An electric current produces what?

a)

magnetic field

b)

magnet

c)

solenoid

d)

insulator

77.
What kind of magnet can be turned on and off? (Man-made magnet)
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
78.
If you wrap more coils around an electromagnet, it will become...(think about the Webquest.)
a)
brighter
b)
stronger
c)
weaker
d)
invisible
79.
What is the flow of electricity?
a)
electric motor
b)
Electric current
c)
Electric eel
d)
electric circuit
80.
What is inside a toy car that turns the wheels?
a)
generator
b)
electric motor
c)
electromagnet
81.
A device that converts kinetic energy into electrical energy
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. electricity
82.

How do you change the strength of a magnetic field?

a)

Add more current through the wire or add more loops

b)

Add more loops or make the coils closer together

c)

Add more current through the iron core or through the wire

d)

Add more current or spin it very fast

83.
A coil of wire with an electric current in it is called a(n)
a)
A. transformer.
b)
B. electric generator.
c)
C. electric motor.
d)
D. solenoid.
84.
Which of the following are two kinds of magnets?
a)
A. atoms, domains
b)
B. magnetic fields, magnetic poles
c)
C. ferromagnets, electromagnets
d)
D. magnesia magnets, magnetite magnets
85.
A motor uses an electromagnet 
a)
to change electrical energy to mechanical energy.
b)
to change mechanical energy to electrical energy.
c)
to change chemical energy to electrical energy. 
d)
to turn electrical energy into light.
86.

Can you separate a magnet?

a)

Yes, but are the same the two parts are going to have north and south

b)

No

87.
As electrons move, they make
a)
A. electromagnetism.
b)
B. auroras.
c)
C. ferromagnetism.
d)
D. magnetic fields.
88.
Which of the following are two kinds of magnets?
a)
A. atoms, domains
b)
B. magnetic fields, magnetic poles
c)
C. ferromagnets, electromagnets
d)
D. magnesia magnets, magnetite magnets
89.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
90.
If you wrap more coils around an electromagnet, it will become 
a)
brighter
b)
stronger
c)
weaker
d)
invisible
91.

This picture best illustrates the construction of a(n)

a)

magnet

b)

electromagnet

c)

series circuit

d)

parallel circuit

92.
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
93.
What is true about electricity and magnetic fields?
a)
Electricity is needed to create any magnet.
b)
Electricity always creates a magnetic field.
c)
Electricity is stronger than a magnetic field.
d)
Electricity prevents magnetic fields from occurring.
94.
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.
95.

What is magnetic force?

a)

A force exerted by electrically charged particles

b)

A force exerted by magnets that can be felt by objects near a magnet

c)

A force exerted by magnets that makes an object become electrically charged

d)

A force exerted by a magnet only when it physically touches an object

96.

The picture above is an example of what?

a)

Magnetic field

b)

Electric field

c)

Repulsion

d)

Attraction

97.

What would happen with the magnets in the picture above?

a)

They would repel

b)

Nothing

c)

They would attract

d)

They would repel and then attract

98.
The ability of some materials to attract certain metals is called
a)
Electricity
b)
Magnetism
c)
Electromagnetism
d)
Atoms
99.

If the north pole of a magnet is brought close to the south pole of another magnet, what will happen?

a)

They will atrract each other

b)

They will repel each other

c)

They will demagnitize

d)

The south pole will turn around so the north pole is facing the other magnet.

100.

What does this image show?

a)

Parallel circuit

b)

Series circuit

c)

Magnet

d)

Electromagnet

101.

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

a)

magnetism

b)

magnetic current

c)

magnetic field

d)

electric current

102.

A _______________ is a current-carrying coil of wire with many loops.

a)

magnet

b)

electromagnet

c)

solenoid

d)

compass

103.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

a)

decrease

b)

increase

c)

not affect

104.

What happens to the strength of a magnetic field as you move away from the magnet?

a)

The strength of the magnetic field increases.

b)

The strength of the magnetic field doesn't change.

c)

The strength of the magnetic field is doubled.

d)

The strength of the magnetic field decreases.

105.

What conclusion can you draw from this graph?

a)

As current increases, magnetic strength decreases.

b)

As current increases, magnetic strength increases.

c)

As current decreases, magnetic strength increases.

d)

There is no relationship between current and magnetic strength.

106.

As the strength of a magnetic field increases, the ability to attract metal objects ____________.

a)

increases

b)

decreases

c)

stays the same

107.
The process of creating a current in a circuit by changing a magnetic field
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. magnet
108.
What is created when a magnet moves through a coil of wire?
a)
A. an electromagnet
b)
B. a ferromagnet
c)
C. a solenoid
d)
D. an electric current
109.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
110.
If you wrap more coils around an electromagnet, it will become 
a)
brighter
b)
stronger
c)
weaker
d)
invisible
111.
What is the flow of electricity?
a)
electric motor
b)
Electric current
c)
Electric eel
d)
electric circuit
112.

The strongest parts of the magnet are ...

a)

fronts

b)

backs

c)

poles

d)

middle

113.

A magnet will pick up an object that is made of...

a)

plastic

b)

iron or steel

c)

glass

d)

copper

114.

The area around a magnet is called the .....

a)

attraction zone

b)

work area

c)

magnetic field

d)

hot zone

115.
True or False: All metals stick to magnets.
a)
True
b)
False
116.

Why does the compass needle move at different locations?

a)

Because the needle is attracted to the magnetic field produced by the magnet

b)

Because north is up

c)

Because it is being attracted to the Magnetic North Pole

d)

Because north is down

117.

Every magnet has a:

a)

East and West pole

b)

North and South pole

c)

East and South pole

d)

North and West pole

e)

Chicago and Saint pole

118.
What is true about electricity and magnetic fields?
a)
Electricity is needed to create any magnet.
b)
Electricity always creates a magnetic field.
c)
Electricity is stronger than a magnetic field.
d)
Electricity prevents magnetic fields from occurring.
119.
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
120.
Electric current flowing through a wire produces
a)
static electricity
b)
an open circuit
c)
a permanent magnet
d)
a magnetic field
121.

When running a current through a wire, what do the blue lines represent?

a)

The wire spinning

b)

A magnetic field that was created

c)

Electrons leaving

d)

Electricity

122.
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
123.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

a)

decrease

b)

increase

c)

not affect

124.

What type of core is best for electromagnets?

a)

Steel

b)

Iron

c)

Plastic

d)

Copper

125.

As the strength of a magnetic field increases, the ability to attract metal objects ____________.

a)

increases

b)

decreases

c)

stays the same

126.

Electrons have a ____________ charge.

a)

negative

b)

neutral

c)

positive

127.

Which of the following is NOT a (ferro)magnetic metal?

a)

Copper

b)

Nickel

c)

Cobalt

d)

Iron

128.

What name is given to those parts of a magnet where the magnetic effect is most concentrated?

a)

Terminals

b)

Alloys

c)

Poles

d)

Attractors

129.

Which of the following is NOT found in the Periodic Table of the Elements?

a)

Selenium

b)

Steel

c)

Titanium

d)

Tin

130.

From the following list of forces, which is the odd-one-out?

a)

Weight

b)

Magnetism

c)

Electrostatics

d)

Friction

131.

The south-pole of a powerful bar magnet is brought close to a brass ring. Which of the following best describes what will happen?

a)

Nothing

b)

Attraction

c)

Levitation

d)

Repulsion

132.

The south-pole of a powerful bar magnet is brought to within 1 cm of a steel paperclip. Which of the following best describes what will happen?

a)

Nothing

b)

Attraction

c)

Repulsion

d)

Contraction

133.

Which of the following correctly describes the direction of a magnetic field?

a)

Strong to Weak

b)

North to South

c)

South to North

d)

Weak to Strong

134.

Which of the following could be repelled by the NORTH pole of a bar magnet.

a)

A pencil

b)

A steel paperclip

c)

A gold coin

d)

A magnet

135.

Which of the following arrangement of poles will produce a force of REPULSION?

a)

North - North

b)

North - South

c)

South - North

d)

South - South

136.

A steel paperclip (which is itself not a magnet) is attracted to the South pole of a bar magnet. This paperclip then exerts an attractive force on a second paperclip. What is this an example of?

a)

Electromagnetism

b)

Induced magnetism

c)

Permanent magnetism

d)

Ultra-magnetism

137.

Which of the following terms is used to describe the type of magnetism that is not easily removed?

a)

Induced magnetism

b)

Fixed magnetism

c)

Permanent magnetism

d)

Electromagnetism

138.

Which of the following best describes the magnetic field that surrounds a current-carrying wire?

a)

A double-helix

b)

Figure-of-eight

c)

A solenoid

d)

A circle with the wire at its centre

139.

What name is given to a coil of copper wire?

a)

Transformer

b)

Electromagnet

c)

Solenoid

d)

Monopole

140.

Which of the following has NO EFFECT on the strength of an electromagnet?

a)

The number of turns (loops) on the solenoid.

b)

The current that is flowing through the solenoid.

c)

The type of metal core placed through the solenoid.

d)

The government.

141.

In Fleming's Left-Hand Rule, what does the index finger indicate?

a)

The direction of the force on the wire.

b)

The direction of the current that flows through the wire.

c)

The direction of the magnetic field.

d)

The direction of the voltage that makes the current flow.

142.

What is the definition of electric charge?

a)

A physical property causing objects or atoms to attract or repel each other without touching.

b)

A physical property causing objects or atoms to be solid, liquid, or gas.

c)

A physical property causing objects or atoms to multiply and divide.

d)

A physical property causing objects or atoms to move magnetically.

143.

Which of the following can move from one atom to another?

a)

Protons.

b)

Neutrons.

c)

Electrons.

d)

Nucleus.

144.

Electricity is...

a)

the movement of the sun.

b)

the movement of electrons.

c)

the movement of the moon.

d)

the movement of air.

145.

A type of static electricity that occurs in storms is...

a)

clouds.

b)

rain.

c)

thunder.

d)

lightning.

146.

Electricity can be changed into other forms of energy, including...

a)

light, heat, sound, and motion.

b)

cooling, running, freezing, and motion.

c)

heat, air, tires, and fans.

d)

up, down, left, and right.

147.

The flow of electricity is a/an...

a)

battery.

b)

resistor.

c)

current.

d)

insulator.

148.

A complete pathway for the flow of electricity is called a...

a)

circuit.

b)

series.

c)

parallel.

d)

current.

149.

When a circuit is ____________ it is incomplete, and charges cannot flow through.

a)

open

b)

closed

c)

series

d)

parallel

150.

In a series circuit, if one bulb goes out...

a)

the circuit will still work.

b)

the circuit becomes parallel.

c)

the circuit will not work.

d)

the circuit will reverse the flow.

151.

Materials that will not allow electric current to flow are called...

a)

conductors.

b)

insulators.

c)

components.

d)

electromagnets.

152.

When running a current through a wire, what do the blue lines represent?

a)

The wire spinning.

b)

A magnetic field.

c)

Electrons leaving.

d)

Electricity.

153.

The ability of some materials to attract certain metals is called...

a)

Electricity.

b)

Magnetism.

c)

Electromagnetism.

d)

Atoms.

154.

How do you magnetize an iron nail?

a)

Rub one end of a magnet, in the same direction, to align the domains.

b)

Rub one end of a magnet, in the opposite directions, to unwind the domains.

c)

Iron is always a permanent magnet.

d)

Expose the iron to extreme temperatures.

155.

What would happen with the magnets in the picture above?

a)

They would repel.

b)

They would attract and then repel.

c)

They would attract.

d)

They would repel and then attract.

156.

Every magnet has a/an...

a)

east and west pole.

b)

north and south pole.

c)

east and south pole.

d)

west and north pole.

157.

What is the difference between a permanent magnet and an electromagnet?

a)

An electromagnet can't be turned on and off.

b)

A permanent magnet can be turned on and off.

c)

An electromagnet can be turned on and off.

d)

A permanent magnet is stronger than an electromagnet.

158.

Earth acts like a giant magnet because its center is made up mostly of...

a)

granite.

b)

gold.

c)

iron.

d)

limestone.

159.
Where is Earth's magnetic field strongest?
a)

Along the outside lines.

b)

Along the inside lines on either side.

c)

Where the lines are close together at the poles.

d)

In the space outside of the lines.

160.
Why does a compass always point north?
a)

The needle is a magnet, and it aligns with the Earth's magnetic field.

b)

Earth is a magnet, and it attracts all metal objects towards the north.

c)

Earth's south pole does not have a magnetic pull.

d)

All magnets have a north and south pole.

161.

The interaction between electricity and magnetism is...

a)

A. magnetic force.

b)

B. electromagnetism.

c)

C. electric force.

d)

D. magnetic poles.

162.

When drawing magnetic field lines, they should have…

a)

arrows pointing south to north

b)

arrows pointing in both directions

c)

no arrows

d)

arrows pointing north to south

163.

An unmagnetised iron nail is passed through a coil of wire attached to a sensitive ammeter.

What happens?

a)

The nail is attracted

b)

The nail is repelled

c)

A current is induced

d)

No current is induced

164.

A magnetic field is acting away from you and a conductor moves upwards through this field.

If you use Fleming's right hand rule, what can you conclude?

a)

No current will be induced

b)

A current will be induced upwards

c)

A current will be induced to the left

d)

A current will be induced away from you

165.

A current passes through this solenoid from the left to right end. How should the magnetic field arrows be drawn?

a)

The magnetic field arrows should be drawn inward at both ends

b)

The magnetic field arrows should be drawn outward at both ends

c)

The magnetic field arrows should be drawn into the left end and out of the right end

d)

The magnetic field arrows should be drawn into the right end and out of the left end

166.

The region around a magnet where the effect of the magnet can be felt is called the…

a)

magnetic pole

b)

magnetic field

c)

magnetic force

d)

magnetic line

167.

An iron nail that isn't initially magnetic is brought close to a magnet and becomes magnetised.

What is the nail now called?

a)

A constant magnet

b)

A permanent magnet

c)

A temporary magnet

d)

An induced magnet

168.

Which piece of equipment would you NOT need to use in order to show how a current is induced?

a)

A magnet

b)

A battery

c)

A wire

d)

An ammeter

169.

Which of the following describes what a relay switch can be used for?

a)

To attract a hammer to hit a bell

b)

To attract the switch terminals of a circuit to turn on something needing a larger current

c)

To attract an iron bolt to pull it back

d)

To attract an iron bar to activate an electronic counter

170.

When you move towards a magnet, the magnetic field becomes…

a)

stronger

b)

more spread out

c)

weaker

d)

parallel

171.

A magnet is moved past a straight wire and a current is induced.

Which of the following would increase the induced current?

a)

Turning the magnet round

b)

Moving the magnet past in the opposite direction

c)

Making the wire into a coil

d)

Moving the magnet more slowly

172.

Which of the following would NOT make an electromagnet stronger?

a)

Having the wire coils turn in both directions

b)

Wrapping more turns of wire round the core

c)

Using a soft iron core instead of air

d)

Increasing the current through the wire

173.

A magnet is passed through a coil of wire at a steady speed.

It is then passed back through the same coil of wire at the same speed but in the opposite direction.

Which of the following is true?

a)

The current is now stronger, but in the same direction

b)

The current is the same strength and in the same direction

c)

The current is the same strength but in the opposite direction

d)

The current is now stronger and in the opposite direction

174.

The magnetic field around a solenoid is the same shape as the magnetic field…

a)

between two north poles

b)

between two south poles

c)

between two opposite poles

d)

surrounding a bar magnet

175.

A coil of wire is connected to a sensitive voltmeter.

A magnet is pushed into the coil then left there.

What does the voltmeter needle do?

a)

The needle does not respond

b)

The needle flicks to the right then stays in that position

c)

The needle flicks right then left

d)

The needle flicks right then returns to zero when the magnet stops moving

176.

Look at this solenoid. How would a permanent magnet stood underneath the solenoid be affected?

a)

A permanent magnet stood under this solenoid with the south pole upwards would be attracted

b)

A permanent magnet stood under this solenoid with the south pole upwards would be repelled

c)

A permanent magnet stood under this solenoid with the north pole upwards would be repelled

d)

A permanent magnet stood under this solenoid with the north pole upwards would be unaffected

177.

How could you investigate the strength of an electromagnet?

a)

See how many plastic beads it can hold

b)

See how many steel paper clips it can hold

c)

See how many copper nails it can hold

d)

See how many brass tacks it can hold

178.

What does this image show?

a)

This image shows two opposite poles repelling

b)

This image shows two opposite poles attracting

c)

This image shows two like poles repelling

d)

This image shows two like poles attracting

179.

How are the two poles on a bar magnet named?

a)

North and north

b)

South and south

c)

North and south

d)

East and west

180.

When a current passes through a straight length of wire, the magnetic field created is…

a)

alongside the wire in the direction of the current

b)

alongside the wire but in the opposite direction to the current

c)

circular, along the length of the wire

d)

radiating outwards from the wire in all directions

181.

A magnet is dropped through a coil of wire.

Which of these suggestions will NOT affect the strength of current that is induced?

a)

Drop the magnet through with the other pole pointing downwards

b)

Drop a stronger magnet through the coil

c)

Use a coil with more turns of wire

d)

Lower the magnet through on a string instead of dropping it

182.

Which of these devices does NOT use a solenoid?

a)

A door bell

b)

A relay switch

c)

An electric door lock

d)

An electric fan

183.

An iron bar is made to be magnetic all the time.

What is the iron bar called?

a)

A constant magnet

b)

A permanent magnet

c)

A temporary magnet

d)

An induced magnet

184.

Which of the following is NOT an advantage of an electromagnet?

a)

Can be turned on and off easily

b)

Can be made stronger or weaker easily

c)

Poles can be reversed easily

d)

Doesn't need a power supply

185.

Electromagnetic induction causes a current to flow when…

a)

currents cut through a field

b)

a field experiences a force

c)

a conductor cuts through magnetic field lines

d)

a conductor aligns with magnetic field lines

186.

The function of a transformer is to ...

a)

raise and lower the apparent power levels

b)

transfer DC voltage from the primary winding to the secondary winding

c)

increase or decrease A.C voltage or A.C current levels

d)

transform mechanical energy into electrical energy

187.

A step up transformer has its primary winding to secondary winding ratio

a)

Greater than 1

b)

Equal to 1

c)

Less than 1

d)

Unknown

188.

Primary winding of a transformer is determined by ...

a)

which winding is nearer to the load

b)

which winding is connected to the source

c)

which winding has more turns

d)

which side has the highest voltage

189.

Choose the correct statement:

a)

The ratio of the secondary voltage to the primary voltage is equal to the ratio of the primary turn to the secondary turn

b)

The ratio of the primary current to the secondary current is equal to the ratio of the primary voltage to the secondary voltage

c)

The ratio of the primary apparent power to the secondary apparent power is equal to the ration of the primary voltage to the secondary voltage

d)

The ratio of the secondary current to the primary current is equal to the ratio of the primary turn to the secondary turn

190.

Mutual induction means: (Choose the correct statement)

a)

A conductor (wire) placed in a varying magnetic field will have a current induced in it

b)

A conductor produces varying magnetic field

c)

Two conductors must be connected together to produce current

d)

Two conductors cannot used magnetic field to produce current

191.

choose all step down transformers

a)

TV adapter

b)

Mobile charger

c)

Transformer outside the homes

d)

Transformers outside power generating stations

192.

Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary?

a)

30 V

b)

0.333 V

c)

2 V

d)

120V

193.
Ratio of voltages is equal to ratio of
a)
iron sheets in core
b)
coil
c)
number of turns in coil
d)
all of above
194.
Will a transformer work with direct current (d.c.) or alternating current (a.c.)?
a)
a.c. only
b)
d.c. only
c)
Both a.c. and d.c.
195.
This picture is an example of a ___________
a)
Step- Up Transformer
b)
Step- Down Transformer
c)
Motor
d)
Generator
196.

A 12Ω resistor is connected across the secondary winding of an ideal transformer whose secondary voltage is 120V. Determine the primary voltage if the supply current is 4A.

4 lines

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9th - 12th Grade