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Worksheets

IGCSE Magnetism and Electricity

Total questions: 499

Worksheet time: 11hrs 16mins

Name
Class
Date
1.

Which statement about a magnet is correct?

a)

A magnet attracts a gold rod.

b)

A magnet does not attract a plastic rod.

c)

A magnet never repels another magnet.

d)

A magnet sometimes repels an unmagnetised nickel rod.

2.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod.

Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

a)

rod = iron; type of magnetic material = hard

b)

rod = iron; type of magnetic material = soft

c)

rod = steel; type of magnetic material = hard

d)

rod = steel; type of magnetic material = hard

3.

Two nickel bars are placed close to the N-pole of a bar magnet. The nickel bars become magnetised.

Which row states the pole induced at P, the pole induced at Q, and the type of magnetic force between P and Q?

a)

pole induced at P = N; pole induced at Q = S; force between

P and Q = attraction

b)

pole induced at P = N; pole induced at Q = S; force between

P and Q = repulsion

c)

pole induced at P = S; pole induced at Q = N; force between

P and Q = attraction

d)

pole induced at P = S; pole induced at Q = N; force between

P and Q = repusion

4.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod.

Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

a)

rod = iron; type of magnetic material = hard

b)

rod = iron; type of magnetic material = soft

c)

rod = steel; type of magnetic material = hard

d)

rod = steel; type of magnetic material = soft

5.

Which statement about magnetism is correct?

a)

An unmagnetised iron bar becomes magnetised when it is placed near a magnet.

b)

An unmagnetised steel bar can be magnetised by passing a current through it.

c)

The direction of magnetic field lines is from an S-pole to an N-pole.

d)

The N-poles of two magnets attract each other.

6.

In which pair are both materials magnetic?

a)

aluminium and copper

b)

copper and iron

c)

iron and steel

d)

steel and aluminium

7.

The diagram shows the magnetic field around two bar magnets.

Which diagram shows the poles of the magnets?

a)
b)
c)
d)
8.

The diagram shows apparatus that can be used to make a magnet.

Which metal and which power supply are used to make a permanent magnet?

a)

metal = iron; power supply = 6 V a.c.

b)

metal = iron; power supply = 6 V d.c.

c)

metal = steel; power supply = 6 V a.c.

d)

metal = steel; power supply = 6 V d.c.

9.

A wire perpendicular to the page carries an electric current in a direction out of the page. There are four compasses near the wire.

Which compass shows the direction of the magnetic field caused by the current?

a)

A

b)

B

c)

C

d)

D

10.

Which group contains only non-ferrous metals?

a)

aluminium, brass, iron

b)

brass, copper, lead

c)

copper, iron, steel

d)

copper, lead, steel

11.

An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron core is just above some small soft-iron nails.

The switch is now closed, left closed for a few seconds, and then opened.


What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened?

a)

as switch is closed - nails jump up; as switch is opened - nails fall down

b)

as switch is closed - nails jump up; as switch is opened - nails stay up

c)

as switch is closed - nails stay down; as switch is opened - nails jump up

d)

as switch is closed - nails stay down; as switch is opened - nails stay down

12.

Which action will demagnetise a magnetised piece of steel?

a)

Cool it in a freezer for several hours.

b)

Hit it repeatedly with a hammer.

c)

Put it in a coil carrying a direct current (d.c.).

d)

Put it near an unmagnetised piece of iron.

13.

A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments.

In experiment 1, the magnet is attracted to the coil.


Which row shows what happens in the other two experiments?

a)

experiment 2: magnet attracted; experiment 3: magnet attracted

b)

experiment 2: magnet attracted; experiment 3: magnet repelled

c)

experiment 2: magnet repelled; experiment 3: magnet attracted

d)

experiment 2: magnet repelled; experiment 3: magnet repelled

14.

Three cores of different metals, P, Q and R, are placed inside identical coils of wire.

At least one of the metals is non-ferrous. The cores are held above some iron nails.

The top three diagrams show what happens when there is a current in the coils.

The three diagrams in the second row below show what happens when the current is then switched off in each coil.


Which row identifies whether the core metals are ferrous or non-ferrous?

a)

ferrous = P; non-ferrous = Q and R

b)

ferrous = P and Q; non-ferrous = R

c)

ferrous = Q and R; non-ferrous = P

d)

ferrous = R; non-ferrous = P and Q

15.

Which procedure may be used to demagnetise a steel bar?

a)

cooling it in a freezer for several hours

b)

earthing it with a copper wire for several seconds

c)

removing it slowly from a coil carrying an alternating current (a.c.)

d)

rubbing it in one direction with a woolen cloth

16.

Which statement about a permanent bar magnet is correct?

a)

It is made from a soft magnetic material.

b)

It repels a non-magnetic material.

c)

Its field lines cross each other where the magnetic field is strong.

d)

Its N-pole repels the N-pole of another magnet.

17.

The diagram shows two magnets and two iron rods placed in a line.

Which magnetic poles are induced at the ends J and K of the iron rods?

a)

pole induced at end J = N; pole induced at end K = N

b)

pole induced at end J = N; pole induced at end K = S

c)

pole induced at end J = S; pole induced at end K = N

d)

pole induced at end J = S; pole induced at end K = S

18.

Two iron nails hang from a bar magnet.

Which diagram shows the magnetic poles induced in the nails?

a)

A

b)

B

c)

C

d)

D

19.

The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn.


The results are as follows.

End Q: attracts end R,

attracts end S,

attracts end T,

repels end U.


Which of the metal rods is a magnet?

a)

rod 1 only

b)

rod 1 and rod 2

c)

rod 1 and rod 3

d)

rod 3 only

20.

The diagram shows two bar magnets, stored with metal keepers across the ends. The keepers help to keep the magnets magnetised.

The material used for the keepers becomes strongly magnetised when placed in contact with the

magnets, but does not remain magnetised when taken away from the magnets.


What is a suitable metal to use for the magnets and what is a suitable metal to use for the keepers?

a)

metal for magnets = iron; metal for keepers = iron

b)

metal for magnets = iron; metal for keepers = steel

c)

metal for magnets = steel; metal for keepers = iron

d)

metal for magnets = steel; metal for keepers = steel

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.

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

24.

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

25.

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

26.

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

27.

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

28.

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.

29.

-

a)

A

b)

B

c)

C

d)

D

30.

-

a)

A

b)

B

c)

C

d)

D

31.

-

a)

A

b)

B

c)

C

d)

D

32.

-

a)

A

b)

B

c)

C

d)

D

33.

-

a)

A

b)

B

c)

C

d)

D

34.

-

a)

A

b)

B

c)

C

d)

D

35.

-

a)

A

b)

B

c)

C

d)

D

36.

-

a)

A

b)

B

c)

C

d)

D

37.

-

a)

A

b)

B

c)

C

d)

D

38.

-

a)

A

b)

B

c)

C

d)

D

39.

Some metals can be magnetic. Which of these can be magnetic?

a)

Steel

b)

Copper

c)

Aluminum

d)

Copper

40.
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
41.

Which of the following diagrams is INCORRECT?

a)

A

b)

B

c)

C

d)

D

42.

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.

43.

What is meant by the term magnetic field line?

a)

Line that shows direction of the magnetic force

b)

Line that shows direction a metal object will move.

c)

Line in between the magnetic poles

d)

Line that shows the flow of electric current.

44.

Which statement COULD NOT be used to describe a uniform magnetic field?

a)

Field lines point in the same direction.

b)

Parallel field lines

c)

Field lines get closer together.

d)

Field lines do not change direction.

45.

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.

46.

What does this image show?

a)

Parallel circuit

b)

Series circuit

c)

Magnet

d)

Electromagnet

47.
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
48.

What type of core is best for electromagnets?

a)

Steel

b)

Iron

c)

Plastic

d)

Copper

49.

Which side of the permanent magnet is the SOUTH POLE?

a)

Left side

b)

Right side

50.

Which direction is the CURRENT in the wire?

a)

In to the board.

b)

Out of the board.

51.

True or false. A current carrying wire CAN BE placed inside a magnetic field and experience no force.

a)

True

b)

False

52.

Which of the following will NOT make a d.c. motor spin faster?

a)

Make the magnets closer to the coil.

b)

More loops of wire on the coil.

c)

Higher voltage

d)

Switch around the magnets.

53.

The diagram shows a 12 V d.c. power supply connected across a coil with a metal core.


The core becomes a magnet when the current is switched on. It remains a magnet after the current is switched off.

From which metal is the core made?

a)

aluminium

b)

copper

c)

soft iron

d)

steel

54.

Which material is best for magnetic screening?

a)

copper

b)

iron

c)

lead

d)

plastic

55.

Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?

a)

copper, iron, a compass needle

b)

copper, iron, polythene

c)

iron, steel, a compass needle

d)

iron, steel, polythene

56.

Which properties make materials suitable for use as a core in an electromagnet?

a)

difficult to magnetise and easy to demagnetise

b)

difficult to magnetise and retains magnetic strength

c)

easy to magnetise and retains magnetic strength

d)

easy to magnetise and easy to demagnetise

57.

Which row describes the ease with which iron or steel can be magnetised and demagnetised?

a)

A

b)

B

c)

C

d)

D

58.

The diagrams show an iron nail in four different situations.

In which diagram will the nail become an induced magnet?

a)
b)
c)
d)
59.

A student tries to magnetise a short steel rod.

Which of these tests will show that he has been successful?

a)

both ends of a permanent magnet attract the rod

b)

one end of a permanent magnet repels the rod

c)

the rod picks up a small piece of paper

d)

when freely suspended, the rod points in any direction

60.

Four plotting compasses are placed near a bar magnet. You may ignore any effects of the Earth’s magnetic field.
In which position does the compass appear like this

↓\downarrow  


a)

A

b)

B

c)

C

d)

D

61.

The diagram shows the magnetic field around two bar magnets.

Which diagram shows the poles of the magnets?

a)
b)
c)
d)
62.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
63.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
64.
If you place the North pole of a magnet next to the South pole of another magnet, they will:
a)
Attract
b)
Repel
c)
Do nothing
d)
Shatter
65.
A paper clip is an example of a:
a)
magnetic material
b)
permanent magnet
c)
bar magnet
d)
insulator
66.
In un-magnetized materials the domains are __________ aligned.
a)
super
b)
slightly
c)
randomly
d)
always
67.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
68.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
69.
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
70.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod.

Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

a)

rod = iron; type of magnetic material = hard

b)

rod = iron; type of magnetic material = soft

c)

rod = steel; type of magnetic material = hard

d)

rod = steel; type of magnetic material = hard

71.

Two nickel bars are placed close to the N-pole of a bar magnet. The nickel bars become magnetised.

Which row states the pole induced at P, the pole induced at Q, and the type of magnetic force between P and Q?

a)

pole induced at P = N; pole induced at Q = S; force between

P and Q = attraction

b)

pole induced at P = N; pole induced at Q = S; force between

P and Q = repulsion

c)

pole induced at P = S; pole induced at Q = N; force between

P and Q = attraction

d)

pole induced at P = S; pole induced at Q = N; force between

P and Q = repusion

72.

In which pair are both materials magnetic?

a)

aluminium and copper

b)

copper and iron

c)

iron and steel

d)

steel and aluminium

73.

Which group contains only non-ferrous metals?

a)

aluminium, brass, iron

b)

brass, copper, lead

c)

copper, iron, steel

d)

copper, lead, steel

74.

Which action will demagnetise a magnetised piece of steel?

a)

Cool it in a freezer for several hours.

b)

Hit it repeatedly with a hammer.

c)

Put it in a coil carrying a direct current (d.c.).

d)

Put it near an unmagnetised piece of iron.

75.

The diagram shows two magnets and two iron rods placed in a line.

Which magnetic poles are induced at the ends J and K of the iron rods?

a)

pole induced at end J = N; pole induced at end K = N

b)

pole induced at end J = N; pole induced at end K = S

c)

pole induced at end J = S; pole induced at end K = N

d)

pole induced at end J = S; pole induced at end K = S

76.

The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn.


The results are as follows.

End Q: attracts end R,

attracts end S,

attracts end T,

repels end U.


Which of the metal rods is a magnet?

a)

rod 1 only

b)

rod 1 and rod 2

c)

rod 1 and rod 3

d)

rod 3 only

77.

1 A metal bar PQ hangs from a thin thread and always comes to rest with end P pointing north. Another bar XY of the same metal settles in no definite direction.

What happens if the two bars are brought near one another?

a)

End P and end Q both attract end X.

b)

End P attracts end X but repels end Y.

c)

End P neither attracts nor repels end X.

d)

End P repels end X but attracts end Y.

78.

The diagram shows a 12 V d.c. power supply connected across a coil with a metal core.


The core becomes a magnet when the current is switched on. It remains a magnet after the current is switched off.

From which metal is the core made?

a)

aluminium

b)

copper

c)

soft iron

d)

steel

79.

What always produces a permanent bar magnet?

a)

an iron bar in a coil carrying alternating current (a.c.)

b)

an iron bar in a coil carrying direct current (d.c.)

c)

a steel bar in a coil carrying alternating current (a.c.)

d)

a steel bar in a coil carrying direct current (d.c.)

80.

Which material is best for magnetic screening?

a)

copper

b)

iron

c)

lead

d)

plastic

81.

Which material is used to magnetically screen electrical equipment from unwanted magnetic fields?

a)

aluminium

b)

iron

c)

steel

d)

copper

82.

Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?

a)

copper, iron, a compass needle

b)

copper, iron, polythene

c)

iron, steel, a compass needle

d)

iron, steel, polythene

83.

Which properties make materials suitable for use as a core in an electromagnet?

a)

difficult to magnetise and easy to demagnetise

b)

difficult to magnetise and retains magnetic strength

c)

easy to magnetise and retains magnetic strength

d)

easy to magnetise and easy to demagnetise

84.

Which row describes the ease with which iron or steel can be magnetised and demagnetised?

a)

A

b)

B

c)

C

d)

D

85.

The diagram shows how a steel bar can be magnetised.


Which statement describes how the steel bar can be demagnetised?

a)

Reverse the d.c. supply and gradually decrease the current in the circuit.

b)

Reverse the d.c. supply and gradually increase the current in the circuit.

c)

Use an a.c. supply and gradually decrease the current in the circuit.

d)

Use an a.c. supply and gradually increase the current in the circuit.

86.

The diagram shows a model railway signal.


What does the end P do when the switch is closed?

a)

It goes down and stays down.

b)

It goes up and stays up.

c)

It goes down and then returns to its original position.

d)

It goes up and then returns to its original position.

87.

Which part of a video tape recording system does not rely on magnetic material for its operation?

a)

the drive motor

b)

the power lead

c)

the transformer

d)

the video tape

88.

The diagram shows a brass rod and an iron rod beside each other at the bottom of a rectangular coil.


What happens when a d.c. current passes through the coil?

a)

Only the brass rod is magnetised.

b)

Only the iron rod is magnetised.

c)

The two rods attract each other.

d)

The two rods repel each other.

89.

The diagrams show an iron nail in four different situations.

In which diagram will the nail become an induced magnet?

a)
b)
c)
d)
90.

A student tries to magnetise a short steel rod.

Which of these tests will show that he has been successful?

a)

both ends of a permanent magnet attract the rod

b)

one end of a permanent magnet repels the rod

c)

the rod picks up a small piece of paper

d)

when freely suspended, the rod points in any direction

91.

Four plotting compasses are placed near a bar magnet. You may ignore any effects of the Earth’s magnetic field.
In which position does the compass appear like this

 ↓\downarrow  


a)

A

b)

B

c)

C

d)

D

92.

What does the arrow on a magnetic field line show?

a)

the direction of a magnetic field

b)

the electrostatic attraction

c)

the presence of an electric current

d)

the strength of a magnetic field

93.

Which of these field patterns is correct?

a)

b)

c)

d)

94.

What do equal spaces between magnetic field lines show about the magnetic field?

a)

It has uniform strength

b)

It goes from a S-pole to a N-pole

c)

It must be caused by a current

d)

It must be caused by a bar magnet.

95.

Which pair of objects attract each other?

a)

b)

c)

d)

96.

Which magnet has the strongest magnetic field?

a)

b)

c)

d)

97.

The diagram shows the magnetic field around two bar magnets.

a)

b)

c)

d)

98.
.
a)
A
b)
B
c)
C
d)
D
99.
.
a)
A
b)
B
c)
C
d)
D
100.
.
a)
A
b)
B
c)
C
d)
D
101.
.
a)
A
b)
B
c)
C
d)
D
102.
.
a)
A
b)
B
c)
C
d)
D
103.
.
a)
A
b)
B
c)
C
d)
D
104.
.
a)
A
b)
B
c)
C
d)
D
105.
.
a)
A
b)
B
c)
C
d)
D
106.
.
a)
A
b)
B
c)
C
d)
D
107.
.
a)
A
b)
B
c)
C
d)
D
108.
.
a)
A
b)
B
c)
C
d)
D
109.
.
a)
A
b)
B
c)
C
d)
D
110.
.
a)
A
b)
B
c)
C
d)
D
111.
.
a)
A
b)
B
c)
C
d)
D
112.
.
a)
A
b)
B
c)
C
d)
D
113.
.
a)
A
b)
B
c)
C
d)
D
114.
.
a)
A
b)
B
c)
C
d)
D
115.
.
a)
A
b)
B
c)
C
d)
D
116.
.
a)
A
b)
B
c)
C
d)
D
117.
.
a)
A
b)
B
c)
C
d)
D
118.
.
a)
A
b)
B
c)
C
d)
D
119.
.
a)
A
b)
B
c)
C
d)
D
120.
.
a)
A
b)
B
c)
C
d)
D
121.
.
a)
A
b)
B
c)
C
d)
D
122.
.
a)
A
b)
B
c)
C
d)
D
123.
.
a)
A
b)
B
c)
C
d)
D
124.
.
a)
A
b)
B
c)
C
d)
D
125.
.
a)
A
b)
B
c)
C
d)
D
126.
.
a)
A
b)
B
c)
C
d)
D
127.
.
a)
A
b)
B
c)
C
d)
D
128.
.
a)
A
b)
B
c)
C
d)
D
129.
.
a)
A
b)
B
c)
C
d)
D
130.
.
a)
A
b)
B
c)
C
d)
D
131.
.
a)
A
b)
B
c)
C
d)
D
132.
.
a)
A
b)
B
c)
C
d)
D
133.
.
a)
A
b)
B
c)
C
d)
D
134.
.
a)
A
b)
B
c)
C
d)
D
135.
.
a)
A
b)
B
c)
C
d)
D
136.
.
a)
A
b)
B
c)
C
d)
D
137.
.
a)
A
b)
B
c)
C
d)
D
138.
.
a)
A
b)
B
c)
C
d)
D
139.
.
a)
A
b)
B
c)
C
d)
D
140.
.
a)
A
b)
B
c)
C
d)
D
141.
.
a)
A
b)
B
c)
C
d)
D
142.
.
a)
A
b)
B
c)
C
d)
D
143.
.
a)
A
b)
B
c)
C
d)
D
144.

The diagram shows two magnets and two iron rods placed in a line. Which magnetic poles are induced at the end J of the iron rod?

a)

North

b)

South

c)

Either

d)

Neither

145.

A magnet is placed on a balance. The balance reading changes when an iron bar or another magnet is held close to the first magnet. The arrangements are shown in the diagrams. What’s the possible reading of balance in Diagram 2?

a)

100g

b)

More than 100g

c)

Less than 100g

146.

Which action will demagnetise a magnetised piece of steel?

a)

Place magnet in a strong magnetic field produced by AC, pull magnet out slowly

b)

Place magnet in a strong magnetic field produced by AC,then switch off the circuit

c)

Hammer magnet in N-S direction

d)

Place metal in a strong magnetic field produced by DC

147.

Which action will magnetise a piece of steel?

a)

Place magnet in a strong magnetic field produced by AC, pull magnet out slowly

b)

Place magnet in a strong magnetic field produced by AC,then switch off the circuit

c)

Hammer magnet in E-W direction

d)

Place metal in a strong magnetic field produced by DC

148.

The diagram shows two magnets and two iron rods placed in a line. Which magnetic poles are induced at the end K end of the iron rod?

a)

North

b)

South

c)

Either

d)

Neither

149.
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
150.

Magnetic field direction is from ...

a)

North to south

b)

South to north

c)

South to south

d)

North to north

151.

Where is the force of a magnet the strongest?

a)

at the magnet's poles

b)

in the middle of the magnet

c)

far away from the magnet

152.

Which of the following is not a pole on a magnet?

a)

North (N)

b)

Positive (P)

c)

South (S)

153.

When all of the magnetic fields of magnetic domains align in the ______ direction, a material becomes magnetic.

a)

opposite

b)

same

154.

If two magnets have their North Poles facing each other then what will happen?

a)

They will attract.

b)

They will drift.

c)

They will explode.

d)

They will repel.

155.

What does the strength of a magnetic force depend on?

a)

how close an object is to the magnet

b)

the size of the magnet

c)

what the magnet is made of

d)

all of the above

156.

Magnetic field lines can cross each other.

a)

true

b)

false

157.

All magnets have _____.

a)

two north poles

b)

one north and one south pole

c)

two positive poles

d)

one top and one bottom pole

158.

Which metal is NOT magnetic?

a)

copper

b)

iron

c)

cobalt

d)

nickel

159.

Which of the following shows the magnetic field correctly around a bar magnet?

a)

Diagram A

b)

Diagram B

c)

Diagram C

d)

Diagram D

160.

As you bring two magnets closer together, the magnetic force between them ___.

a)

increases regardless of whether they are repelling or attracting.

b)

increases but only if they are attracting.

c)

increases but only if they are repelling.

d)

decreases regardless of whether they are repelling or attracting.

161.

Why are paper clips attracted to magnets?

a)

They contain aluminum.

b)

They contain iron.

c)

They contain tin.

d)

They contain silver.

162.

We know the substance in the image is magnetized because ___.

a)

All the domains are at right angles to each other.

b)

All the domains are aligned.

c)

All the arrows are drawn in red.

d)

All the domains are not aligned.

163.

The space in which the magnetic effects exists is called ___.

a)

the magnetic field

b)

the magnetic domain

c)

the magnetic material

164.

What happens if a magnet is cut in half or broken?

a)

one piece has a north pole only

b)

one piece has a south pole only

c)

the magnet becomes unmagnetized

d)

both pieces will have a north and a south pole

165.

How do magnetic field lines move?

a)

always from the south pole towards the

north pole

b)

always from the north pole towards the

south pole

c)

always from the pole to the middle

d)

depends of the type of magnet

166.

Magnetic field lines that are drawn closer to each other show ___.

a)

a decrease in polarity

b)

an increase polarity

c)

a smaller magnetic force

d)

a greater magnetic force

167.

Which answer describes the pictures correctly?

a)

Both drawings show attraction of magnetic forces.

b)

The left drawing shows repulsion and the right drawing shows attraction of magnetic forces.

c)

Both drawings show repulsion of magnetic forces.

d)

The left drawing shows attraction and the right drawing shows repulsion of magnetic forces.

168.

What is the source of a magnetic field?

a)

Moving electric charge

b)

Stationary Electric Charge

c)

There is no source.

169.

The circuit contains four ammeters, P, Q, R and S.

Which statement about the readings on the ammeters is correct?

a)

The reading on S is less than the reading on P.

b)

The reading on Q is greater than the reading on S.

c)

The reading on R is less than the reading on S.

d)

The reading on Q is greater than the reading on P.

170.

A student wishes to measure an e.m.f. and a potential difference.

Which meter(s) does she need?

a)

an ammeter only

b)

a voltmeter only

c)

a voltmeter and an ammeter

d)

a voltmeter and a newton meter

171.

The circuit shows a current I in a resistor of resistance R.

Which row gives possible values of I and of R ?

a)

A

b)

B

c)

C

d)

D

172.

Two rods, X and Y, look the same.

The N pole of a magnet is brought close, in turn, to P, Q, T and U. The results of these four actions are shown in the table.


Which of the rods is a permanent magnet, with a pole at each end?

a)

both of the rods

b)

neither of the rods

c)

rod X only

d)

rod Y only

173.

The current in a resistor is 0.50 A and the potential difference across the resistor is 4.6 V.


What is the resistance of the resistor?

a)

0.11 Ω

b)

2.3 Ω

c)

5.1 Ω

d)

9.2 Ω

174.

In the circuit all the lamps are lit.

Lamp 2 is removed.

What happens to each of the other lamps?

a)

A

b)

B

c)

C

d)

D

175.

A student believes that a certain steel bar is a magnet.


What shows that the bar is a magnet?

a)

The bar attracts a copper rod.

b)

The bar is attracted by one end of another magnet.

c)

The bar is attracted by both ends of another magnet.

d)

The bar is repelled by one end of another magnet.

176.

A bar magnet is brought near a metal rod.

The magnet is then turned around so that its poles have changed positions. The magnet is again

brought near to the metal rod.


In both cases the metal rod is attracted to the magnet.


What could the metal rod be?

a)

another bar magnet

b)

a piece of aluminium

c)

a piece of copper

d)

a piece of iron

177.

The circuit shown is used to determine the resistance of a lamp.


The ammeter reading is 2.0 A and the voltmeter reading is 6.0 V.


What is the resistance of the lamp?

a)

0.33 Ω

b)

3.0 Ω

c)

8.0 Ω

d)

12 Ω

178.

A 3 Ω.0 resistor and a 6.0 Ω resistor are connected to a power supply as shown.


What is the total resistance of the circuit?

a)

2.0 Ω

b)

3.0 Ω

c)

9.0 Ω

d)

18 Ω

179.

In the lighting circuit in a house, how are lamps usually connected, and what is one reason for this?

a)

A

b)

B

c)

C

d)

D

180.

The instructions for a household lamp state that the plug should be fitted with a 3 A fuse.


What could happen if, by mistake, a 13 A fuse is fitted?

a)

The fuse might melt too easily.

b)

The lamp might explode if a fault develops.

c)

The wires connecting the lamp to the plug might overheat if a fault developed.

d)

Too much voltage might be supplied to the lamp.

181.

A 20 V battery is connected in series with a 4.0 Ω resistor and a 6.0 Ω resistor.


The current in the circuit is 2.0 A.


What is the potential difference across the 6.0 Ω resistor?

a)

8.0 V

b)

10 V

c)

12 V

d)

20 V

182.

a)

X

b)

Y

c)

Z

d)

They all have the same reading

183.

a)

A

b)

B

c)

C

d)

D

184.

a)

A

b)

B

c)

C

d)

D

185.

a)

Less than 4 ohm

b)

50 ohm

c)

Between 60 ohm and 100 ohm

d)

100 ohm

186.

a)

Less than 3 ohm

b)

3.0 ohm

c)

4.5 ohm

d)

more than 6 ohm

187.

a)

4.0 V

b)

6.0 V

c)

8.0 V

d)

12.0 V

188.

Which circuit shows a voltmeter measuring the p.d. across a rasistor

a)
b)
c)
d)
189.

a)

A

b)

B

c)

C

d)

D

190.

a)

A

b)

B

c)

C

d)

D

191.

a)

A

b)

B

c)

C

d)

D

192.

An electromagnet is used to separate magnetic metals from non-magnetic metals.

Why is steel not suitable as the core of the electromagnet?

a)

It forms a permanent magnet

b)

It has a high density

c)

It has a high thermal capacity

d)

It is a good conductor of electricity

193.

How can a permanent magnet be demagnetised?

a)

Cool the magnet for a long time

b)

hit the magnet repeatedly with a hammer

c)

Leave the magnet in a coil which is connected to a batteray

d)

Shine bright light onto the magnet

194.
a)

A

b)

B

c)

C

d)

D

195.

Some resistors aare made using one type of wire. two different lenghts of wire are available. Each lenght is available in two different diameters.

Which wire has the highest resistance?

a)

the wire with the greater lenght and the larger diameter

b)

the wire with the greater lenght and the smaller diameter

c)

the wire with the smaller lenght and the larger diameter

d)

the wire with the smaller lenght and the smaller diameter

196.
a)

A

b)

B

c)

C

d)

D

197.

a)

A

b)

B

c)

C

d)

D

198.

a)

A

b)

B

c)

C

d)

D

199.

A resistor of resistance R is connected to a batteray of e.m.f. V.

There is a current in the resistor.

Power P is dissipated by the resistor, and in time t the energy transferred is E.

Which expression is correct ?

a)

E = I V t

b)

E = P I t

c)

P = V I R

d)

P = V / R

200.
a)

2.4 J

b)

14.4 J

c)

240 J

d)

1440 J

201.

The resistance of a wire depends on its length L and on its cross-sectional area A.

The resistance is?

a)

directly proportional to L and directly proportional to A

b)

directly proportional to L and inversely proportional to A

c)

inversely proportional to L and directly proportional to A

d)

inversely proportional to L and inversely proportional to A

202.
Which circuit symbol represents a component used to measure electric current?
a)
b)

c)

d)

203.
Four wires are made of the same metal. Which wire has the greatest resistance?
a)
a 100 cm long wire with a diameter of 3.0 mm
b)
a 100 cm long wire with a diameter of 6.0 mm
c)
a 10 cm long wire with a diameter of 3.0 mm
d)
a 10 cm long wire with a diameter of 6.0 mm
204.
What happens to the reading on the voltmeter?
a)

It keeps increasing.

b)

It quickly increases and stays at maximum.

c)

It quickly increases and then decreases.

d)

It stays on zero.

205.
A student uses four ammeters P, Q, R and S to measure the current in different parts of the circuit shown. Which two ammeters read the largest current?
a)

P and Q

b)

P and R

c)

R and Q

d)

R and S

206.
Which action will demagnetise a magnetised piece of steel?
a)
Cool it in a freezer for several hours.
b)
Hit it repeatedly with a hammer.
c)
Put it in a coil carrying a direct current (d.c.).
d)
Put it near an unmagnetised piece of iron.
207.
A student investigates electromagnetic induction. She moves the N pole of a magnet quickly towards a coil of wire. There is a reading on the galvanometer. What can she do to get a greater reading on the galvanometer?
a)

Hold the bar magnet stationary inside the coil.

b)

Move the bar magnet slowly away from the coil.

c)

Use a coil of wire with fewer turns on it.

d)

Use a stronger bar magnet.

208.
Which diagram shows the magnetic field around a straight, current-carrying wire?
a)
b)

c)

d)
209.
Which graph shows the voltage output of an a.c. generator with the peaks and zeros correctly labelled
a)
b)
c)

d)

210.
Several cells are connected in series, as shown. What is the combined electromotive force (e.m.f.) of the cells?
a)
the average of the e.m.f.s of the separate cells
b)
the e.m.f. of one of the cells
c)
the product of the e.m.f.s of the cells
d)
the sum of the e.m.f.s of the cells
211.
A student uses three small plotting compasses to investigate the magnetic field around a bar magnet. Which diagram shows the directions in which the compass needles point?
a)

b)

c)

d)

212.
A student is to determine the resistance of resistor R. She uses a circuit including a voltmeter and an ammeter. Which circuit should be used? How many turns of wire are in the secondary coil?
a)
A
b)
B
c)
C
d)
D
213.
A transformer is needed to convert a supply of 240V a.c. into 4800V a.c. Which pair of coils would be suitable for this transformer?
a)

Primary # of turns: 50 ; Secondary # of turns: 1000

b)

Primary # of turns: 240 ; Secondary # of turns: 48 000

c)

Primary # of turns: 480 ; Secondary # of turns: 24

d)

Primary # of turns: 2000 ; Secondary # of turns: 100

214.
What is the function of the split-ring commutator in an electric motor with a single rotating coil?
a)
to enable the motor to function with an a.c. source
b)
to reverse the current in the coil once every revolution
c)
to reverse the current in the coil whenever its plane becomes perpendicular to the magnetic field
d)
to reverse the current in the coil whenever its plane is parallel with the magnetic field
215.
In which unit is potential different measured?
a)
ampere
b)
Ohm
c)
Volt
d)
Watt
216.
In an electric circuit, 40C of electric charge pass a point in 5.0 s. What is the current in the circuit?
a)
0.13A
b)
8.0A
c)
45A
d)
200A
217.
There is a current of 5.0A in a resistor. The potential difference (p.d.) across the resistor is 24V. How much energy is transferred in the resistor in 1.0 minute?
a)
5.0 J
b)
120 J
c)
290 J
d)
7200 J
218.

The diagram shows a circuit containing a cell, a lamp and two ammeters. The current reading on the ammeter 2 is 0.20 A. What is the name for this type of circuit and what is the reading on ammeter 1?

a)

type of circuit: series; reading on ammeter 1: 0.20A

b)

type of circuit: series; reading on ammeter 1: greater than 0.20A

c)

type of circuit: parallel; reading on ammeter 1: 0.20A

d)

type of circuit: parallel; reading on ammeter 1: greater than 0.20A

219.
Two resistors, R1 and R2, are connected in series in a circuit, as shown. The current in the resistors is I0. Another resistor, R3, is then connected in parallel with R2, as shown. How do the currents I1 and I2 in the resistors R1 and R2 compare to current I0?
a)

current in R1: I1 = I0; current in R2: I2 < I0

b)

current in R1: I1 = I0; current in R2: I2 = I0

c)

current in R1: I1 > I0; current in R2: I2 = I0

d)

current in R1: I1 > I0; current in R2: I2 < I0

220.
Which metal is used for the core of a transformer?
a)
aluminium
b)
copper
c)
soft iron
d)
steel
221.
Four small compasses are placed around a solenoid. A current is now switched on in the solenoid. Which diagram shows possible new directions of the compass needles?
a)

b)

c)

d)

222.
What is the purpose of a generator?
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
223.
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
224.

How are fossil fuels used to generate electrical energy?

a)

Heat from burning fuel creates steam that spins a turbine.

b)

Heat from burning fuel spins magnets inside an electric motor.

c)

Heat from burning fuel causes an electric motor to produce a current.

d)

Heat from burning fuel creates steam that turns a transformer.

225.

A temporary magnet that only works when electricity is passed through wires surrounding an iron core is called:

a)

electromagnet

b)

galvanometer

c)

induction

d)

super conductor magnet

226.
What two forces are required for generators and electric motors to work? 
a)
magnetism and thermal 
b)
electricity and thermal 
c)
electricity and magnetism 
d)
magnetism and radiant 
227.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
228.

What is the transfer of energy in when you plug in a motor and it spins?

a)

chemical to mechanical

b)

electrical to mechanical

c)

mechanical to electrical

d)

physical to potential

229.

A device that protects a circuit by from having too much current is called a

a)

switch

b)

short

c)

fuse or breaker

d)

resistor

230.

A laptop is plugged into a 120 V outlet and uses 60 ohm's of resistance. How much current is running though it?

a)

120 Amps

b)

60 Amps

c)

2 Amps

d)

20 Amps

231.

A generator converts.....

a)

Mechanical Energy to Chemical Energy

b)

Mechanical Energy to Nuclear Energy

c)

Electrical Energy to Sound Energy

d)

Mechanical Energy to Electrical Energy

232.
a)

A

b)

B

c)

C

d)

D

233.

What is the reading of the ammeter

a)

0.32 A

b)

0.44 A

c)

1 A

d)

0.28 A

234.

What does the voltmeter read?

a)

2 V

b)

3 V

c)

10 V

d)

1 V

235.
What type of circuit is pictured?
a)
series
b)
Parallel
236.

in which circuit is the lamp brightest

a)

1

b)

2

c)

3

d)

All the same

237.

in which circuit is the lamp brightest

a)

1

b)

2

c)

3

d)

All the same

238.
How many volts are in a circuit with a battery that has a resistance of 10 Ohms and a current of 2 Amps? 
a)
.5 Volts
b)
5 Volts
c)
20 Volts
239.

What is the SI unit of electric current?

a)

B

b)

C

c)

D

d)

A

240.

What is the formula to calculate electric current?

a)

V = IR

b)

I = Q/t

c)

P = IV

d)

R = V/I

241.

What is the direction of the magnetic field around a straight current-carrying conductor?

a)

Square

b)

Spiral

c)

Circular

d)

Straight

242.

What is the SI unit of magnetic field strength?

a)

ampere (A)

b)

joule (J)

c)

tesla (T)

d)

watt (W)

243.

What is the relationship between the strength of the magnetic field and the distance from the current-carrying conductor?

a)

No relationship

b)

Inverse relationship

c)

Exponential relationship

d)

Direct relationship

244.

What is the SI unit of magnetic flux?

a)

weber

b)

joule

c)

ampere

d)

tesla

245.

What is the right-hand rule used for in the context of electromagnetism?

a)

To determine the speed of an electric current

b)

To calculate the resistance of a wire

c)

To measure the voltage of a circuit

d)

To determine the direction of the magnetic field around a current-carrying conductor.

246.

What is the relationship between the number of turns in a coil and the strength of the magnetic field produced?

a)

Inverse proportional

b)

Directly proportional

c)

Randomly proportional

d)

No relationship

247.

What is the function of a commutator in a DC motor?

a)

To control the temperature of the motor

b)

To regulate the voltage in the armature windings

c)

To increase the speed of the motor

d)

To reverse the direction of the current in the armature windings

248.

What is the principle behind the operation of an electric generator?

a)

Electromagnetic induction

b)

Solar radiation

c)

Chemical reaction

d)

Nuclear fission

249.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
250.
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
a)
A positive charge.
b)
A negative charge.
c)
A neutral charge
d)
No charge at all
251.
What happens when you touch a metal doorknob after rubbing your shoes on the carpet?
a)
The doorknob sends a burst of electric current into your body
b)
Millions of electrons go from your finger into the doorknob
c)
The doorknob sends millions of electrons into your finger
d)
our finger becomes negatively charged
252.
Static electricity is:
a)
electricity flowing in a wire
b)
the buildup of electric charges on an object
c)
when protons move between objects
253.
Rubbing a balloon on hair is an example of static charge build up created by....
a)
conduction
b)
friction
c)
induction
d)
hairduction
254.
One example of static electricity is...
a)
rain
b)
thunder
c)
lightning
255.
If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by
a)
friction.
b)
convection.
c)
induction.
d)
conduction.
256.
Charging by ____ occurs when electrons are transferred from one object to another by direct contact.
a)
reduction
b)
induction
c)
conduction
d)
friction
257.

What method of charging is shown in this picture?

a)

Contact

b)

Friction

c)

Grounding

d)

Electron Shifting

258.

Bending water with a charged balloon is an example of what type of charging (charging an object without touching)

a)

friction

b)

induction

c)

conduction

259.

Lightning occurs because ___.

a)

the negative charges at the bottom of clouds are attracted to the positive charges on the ground.

b)

the positive charges at the bottom of clouds are attracted to the negative charges on the ground.

c)

the positive and negative charges inside clouds are attracted to each other

d)

All of these reasons are correct.

260.
Lightning is _____.
a)
a buildup of neutrons
b)
harmless
c)
a high-voltage electric current
d)
a large discharge of static electricity
261.
A region around a charged particle that can exert a force on another charged particle is called an
a)
electric pulse.
b)
electric charge.
c)
electric force.
d)
electric field.
262.

The diagram shows a balloon hanging from an insulating thread. A student gives the balloon a positive charge. Which statement explains why the balloon becomes positively charged?

a)

the balloon gains electrons

b)

the balloon loses electrons

c)

the balloon gains protons

d)

the balloon loses protons

263.

A student rubs a plastic rod with a dry cloth, as shown in the diagram. The rod becomes negatively charged. The student moves the rod close to a suspended, charged rod. The two rods repel each other. Why?

a)

They have the same charge.

b)

They have opposite charges.

c)

They are both made of plastic.

d)

They are both insulators.

264.

A plastic ruler is given a positive charge. A sphere hangs from an insulating thread. A student holds the ruler near the sphere, as shown in the diagram. The ruler repels the sphere. State what charge, if any, the sphere carries.

a)

Negative charge.

b)

Neutral charge.

c)

Positive charge.

d)

No charge.

265.

Three balls P, Q and R are electrically charged. The balls are suspended by threads of insulating

material. The diagram shows the arrangement. Ball P is negatively charged. State the charge on ball Q.

a)

positively charged

b)

negatively charged

c)

neutrally charged

d)

no charge

266.

The electrical resistance of insulators is

a)

High

b)

Low

c)

Zero

d)

Infinitely high

267.

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

a)

440 W

b)

110 W

c)

55 W

d)

0.0023 W

268.
a)
b)
c)
d)
269.

In the circuits shown, all resistors are identical

Which circuit has the least resistance?

a)
b)
c)
d)
270.
a)

A

b)

B

c)

C

d)

D

271.

What would be the reading on the voltmeter?

a)

2 V

b)

6 V

c)

4 V

d)

8 V

272.

a)

A

b)

B

c)

C

d)

D

273.

A teacher writes a set of notes about two non-identical bulbs which are connected in parallel

He makes one mistake. Which of the statements below is incorrect?

a)

They have the same current flowing through them

b)

They have the same potential difference across them

c)

They can be switched on and off individually

d)

If one bulb blows, the other will continue to work

274.

What is component Z ?

(a)  

275.

What is component B

a)

Thermistor

b)

Resistor

c)

Light Dependent Resistor

d)

Relay

276.

How are resistance and length interrelated ?

a)

Directly Proportional

b)

Inversely Proportional

277.

How is resistance and cross-sectional area interrelated?

a)

Directly Proportional

b)

Inversely Proportional

278.

What does the voltmeter read?

a)

2 V

b)

3 V

c)

10 V

d)

1 V

279.

What is the reading of the ammeter

a)

0.32 A

b)

0.44 A

c)

1 A

d)

0.28 A

280.

What happens to the resistance of the LDR when it is dark

a)

Resistance decreasae

b)

Resistance increases

c)

Resistance is constant

d)

Resistance is unchanged

281.

What happens to a thermistor on a hot day

a)

Resistance increases

b)

Resistance decreases

c)

Resistance is constant

d)

Resistance is unchanged

282.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

283.

Which component matches this symbol?

a)

LDR

b)

LED

c)

Diode

d)

Bulb

284.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

285.

Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?

a)
b)
c)
d)
286.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

fuse

c)

resistor

d)

diode

287.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

LDR

288.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

cell

289.

Which of these answers gives the correct way of connecting each meter?

a)

A

b)

B

c)

C

d)

D

290.

What is the correct name for the unit for measuring resistance?

a)

amp

b)

volt

c)

coulomb

d)

ohm

291.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

292.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What is the current through the resistor?

a)

2 mA

b)

2 A

c)

16 mA

d)

16 A

293.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

294.

Which of these answers gives the correct change in resistance for each component?

a)

A

b)

B

c)

C

d)

D

295.

The safety device that limits the current flow in a plug is the

a)

fuse

b)

cable grip

c)

earth wire

d)

insulation

296.

Which of these is the correct formula for electrical power?

a)

P = IV

b)

V = IR

c)

V = PI

d)

P = V/I

297.

A 240 volt, 3 amp heater is left running for 5 minutes.


Which of these gives the total energy output?

a)

3.6 kJ

b)

216 kJ

c)

72 kJ

d)

0.9 kJ

298.

Which of the following is the correct unit for charge?

a)

coulomb

b)

capacitance

c)

current

d)

charge

299.

A 6 V light bulb is switched on for a short time. A 6 V battery transfers 2 C of charge to the bulb in this time. What energy has been transferred?

a)

0.33 J

b)

3 J

c)

6 J

d)

12 J

300.

Which of the following is the definition of a 'volt'?

a)

a joule per coulomb

b)

a watt per coulomb

c)

a joule per amp

d)

a watt per ohm

301.

A wire has a certain electrical resistance. The diameter and length of the wire may be changed. Which pair of changes must cause the resistance of the wire to increase?

a)

A

b)

B

c)

C

d)

D

302.

The table described four different resistance wires. They are all made from the same metal. Which wire has the smallest resistance?

a)

A

b)

B

c)

C

d)

D

303.

What is the unit of electromotive force?

a)

ampere

b)

newton

c)

ohm

d)

volt

304.

What is the unit of electrical power?

a)

ampere

b)

joule

c)

volt

d)

watt

305.

Four students are each given an identical resistor and asked to find its resistance. They each measure the potential difference across the resistor and the current in it. One student makes a mistake. Which row shows the results of the student that makes a mistake?

a)

A

b)

B

c)

C

d)

D

306.

The circuit shown contains a battery, a 6 ohms resistor and two meters X and Y. One meter records current and one meter records potential difference.

a)

A

b)

B

c)

C

d)

D

307.

Which quantities is a voltmeter used to measure?

a)

current and e.m.f. only

b)

current and p.d. only

c)

e.m.f. and p.d. only

d)

e.m.f., current and p.d

308.

What is the ammeter reading with the switch closed?

a)

A

b)

B

c)

C

d)

D

309.

What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

310.

The diagrams show four current-voltage graphs. Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?

a)

A

b)

B

c)

C

d)

D

311.

A resistor of resistance R is connected to a battery of e.m.f. V. There is a current I in the resistor. Power P is dissipated by the resistor, and in time t the energy transferred is E. Which expression is correct?

a)

A

b)

B

c)

C

d)

D

312.

In the circuit shown, the ammeter reads 2.0A and the voltmeter reads 12V. How much energy is transferred by the resistor in 10 seconds?

a)

A

b)

B

c)

C

d)

D

313.

The circuit shown contains three ammeters, X, Y and Z. Which ammeter has the largest reading?

a)

A

b)

B

c)

C

d)

D

314.

P and Q are the circuit symbols for two electrical components. Which components are represented by P and by Q?

a)

A

b)

B

c)

C

d)

D

315.

The diagram shows two resistors connected in a circuit. What could be the combined resistance of this arrangement of resistors?

a)

A

b)

B

c)

C

d)

D

316.

What are lamps in a house lighting circuit connected in parallel rather than in series?

a)

if one lamp stops working, the remaining lamps become brighter

b)

Less current is taken from the power supply

c)

The lamps can be turned off independently using switches

d)

When move lamps are added, their brightness decreases

317.

Four lamps are each labelled 240V. In which circuit do all four lamps have normal brightness?

a)

A

b)

B

c)

C

d)

D

318.

The diagram shows a potential divider connected to two voltmeters P and Q. The resistance of the variable resistor is decreased. Which row shows what happens to the reading on each voltmeter.

a)

A

b)

B

c)

C

d)

D

319.

What is the total resistance of this arrangement?

a)

A

b)

B

c)

C

d)

D

320.

The diagram shows a 10 ohms resistor and a 20 ohms resistor connected in a potential divider circuit. What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

321.

Which component is represented by this circuit symbol?

a)

bell

b)

fuse

c)

relay

d)

transformer

322.

A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots a graph of her results. Which circuit should she use?

a)

A

b)

B

c)

C

d)

D

323.

A circuit is connected for use as a potential divider. The resistance of resistor X is 10 ohms. When the resistance of the variable resistor Y is 20 ohms. What is the reading on the voltmeter?

a)

4V

b)

6V

c)

8V

d)

12V

324.

Which circuit shows the directions of the conventional current I and the flow of electrons?

a)

A

b)

B

c)

C

d)

D

325.

The resistance of a wire depends on its length l and on its cross-sectional area A.

The resistance is...

a)

directly proportional to l and directly proportional to A

b)

directly proportional to l and inversely proportional to A

c)

inversely proportional to l and directly proportional to A

d)

inversely proportional to l and inversely proportional to A

326.
Thicker wires have _______ resistance than thinner wires.
a)
more
b)
less
c)
the same
327.
As the resistance in a circuit increases, the electric current __________.
a)
increases
b)
decreases
c)
stays the same
328.
Electric current is measured in ______.
a)
Watts
b)
Volts
c)
Amperes
329.
Which formulas represents Ohm's law?
a)
V=IR
b)
R=IV
c)
I=RV
330.
What is the unit for resistance?
a)
Volts
b)
Amperes
c)
Ohms
331.
How many volts are in a circuit with a battery that has a resistance of 10 Ohms and a current of 2 Amps? 
a)
.5 Volts
b)
5 Volts
c)
20 Volts
332.
Electricity is the flow of _________.
a)
protons
b)
neutrons
c)
electrons
333.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
334.

What happens to an LDR in bright light

a)

Resistance remains constant

b)

Resistance increase

c)

Resistance decreases

d)

Resistance is unchanged

335.

10C of charge flows in a wire every 2 seconds. Calculate the current in the wire.

a)

5 Ohms

b)

5 Amps

c)

0.2 Volts

d)

0.2 Amps

336.

Use the graph to find the current and calculate the resistance of this conductor when the voltage is 4V? Ignore the mA and just use A.

a)

2

b)

4

c)

1

d)

0.5

337.

Which graph represents a diode?

a)

A

b)

B

c)

C

d)

D

338.

Which graph represents a Filament bulb?

a)

A

b)

B

c)

C

d)

D

339.

Which graph represents a fixed resistor OR an LDR?

a)

A

b)

B

c)

C

d)

D

340.

Longer wires have _______ resistance than shorter wires.

a)

more

b)

less

c)

the same

341.

What happens to a Thermistor in on a cold day

a)

Resistance remains constant

b)

Resistance increase

c)

Resistance decreases

d)

Resistance is unchanged

342.

If a cell provides 12 V to a circuit and 4 Coulombs of charge flows. How much energy is being provided by the cell?

a)

3 J

b)

0.25 J

c)

48 J

d)

16 J

343.

Calculate the voltage of the 4 Ohm resistor in the circuit and use this answer to find the voltage of the across the heater.

a)

4.8 V and 7.2 V

b)

3 V and 9 V

c)

6 V and 6 V

d)

3.2 V and 9.8 V

344.

A polythene rod is rubbed with a cloth. The rod and the cloth both become charged as electrons move between them. The rod becomes negatively charged. Which diagram shows how the rod becomes negatively charged, and the final charge on the cloth.

a)

A

b)

B

c)

C

d)

D

345.

Two balloons, X and Y, are suspended by insulating threads. They are each held near a negatively charged balloon. The balloons hang as shown.

a)

A

b)

B

c)

C

d)

D

346.

Two similar balloons hang side by side, on insulating threads, a short distance apart. They are both rubbed with the same dry cloth and become charged. Which diagram shows how the balloons hang after charging?

a)

A

b)

B

c)

C

d)

D

347.

A negatively charged rod is held to one side of a metal sphere. The other side of the sphere is earthed. Which diagram shows the distribution of charge on the metal sphere?

a)

A

b)

B

c)

C

d)

D

348.

Which statement is correct?

a)

When the earthing wire is disconnected first, the metal plate becomes positively charged

b)

When the earthing wire is disconnected first, the metal plate becomes negatively charged

c)

When the plastic rod is removed first, the metal plate becomes positively charged

d)

When the plastic rod is removed first, the metal plate becomes negatively charged

349.

A wire has a certain electrical resistance. The diameter and length of the wire may be changed. Which pair of changes must cause the resistance of the wire to increase?

a)

A

b)

B

c)

C

d)

D

350.

The table described four different resistance wires. They are all made from the same metal. Which wire has the smallest resistance?

a)

A

b)

B

c)

C

d)

D

351.

What is the unit of electromotive force?

a)

ampere

b)

newton

c)

ohm

d)

volt

352.

What is the unit of electrical power?

a)

ampere

b)

joule

c)

volt

d)

watt

353.

Four students are each given an identical resistor and asked to find its resistance. They each measure the potential difference across the resistor and the current in it. One student makes a mistake. Which row shows the results of the student that makes a mistake?

a)

A

b)

B

c)

C

d)

D

354.

The circuit shown contains a battery, a 6 ohms resistor and two meters X and Y. One meter records current and one meter records potential difference.

a)

A

b)

B

c)

C

d)

D

355.

Which quantities is a voltmeter used to measure?

a)

current and e.m.f. only

b)

current and p.d. only

c)

e.m.f. and p.d. only

d)

e.m.f., current and p.d

356.

What is the ammeter reading with the switch closed?

a)

A

b)

B

c)

C

d)

D

357.

Why are high voltages used for the transmission of electrical energy?

a)

fear of high voltages stops people from interfering with the cables

b)

heat loss in the cables is smaller than if low voltages are used

c)

High voltages increase the current in the cables

d)

High voltages produce large magnetic fields, so less insulation is needed

358.

What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

359.

An ammeter and a 18Ω resistor are connected in series with a battery. The reading on the ammeter is 0.50A. The resistance of the battery and the ammeter can be ignored. What is the electromotive force of the battery?

a)

A

b)

B

c)

C

d)

D

360.

The diagrams show four current-voltage graphs. Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?

a)

A

b)

B

c)

C

d)

D

361.

A resistor of resistance R is connected to a battery of e.m.f. V. There is a current I in the resistor. Power P is dissipated by the resistor, and in time t the energy transferred is E. Which expression is correct?

a)

A

b)

B

c)

C

d)

D

362.

In the circuit shown, the ammeter reads 2.0A and the voltmeter reads 12V. How much energy is transferred by the resistor in 10 seconds?

a)

A

b)

B

c)

C

d)

D

363.

The circuit shown contains three ammeters, X, Y and Z. Which ammeter has the largest reading?

a)

A

b)

B

c)

C

d)

D

364.

The diagram shows part of a circuit used to switch street lamps on and off automatically.

a)

A

b)

B

c)

C

d)

D

365.

P and Q are the circuit symbols for two electrical components. Which components are represented by P and by Q?

a)

A

b)

B

c)

C

d)

D

366.

The diagram shows two resistors connected in a circuit. What could be the combined resistance of this arrangement of resistors?

a)

A

b)

B

c)

C

d)

D

367.

What are lamps in a house lighting circuit connected in parallel rather than in series?

a)

if one lamp stops working, the remaining lamps become brighter

b)

Less current is taken from the power supply

c)

The lamps can be turned off independently using switches

d)

When move lamps are added, their brightness decreases

368.

Four lamps are each labelled 240V. In which circuit do all four lamps have normal brightness?

a)

A

b)

B

c)

C

d)

D

369.

The diagram shows a potential divider connected to two voltmeters P and Q. The resistance of the variable resistor is decreased. Which row shows what happens to the reading on each voltmeter.

a)

A

b)

B

c)

C

d)

D

370.

What is the total resistance of this arrangement?

a)

A

b)

B

c)

C

d)

D

371.

The diagram shows a 10 ohms resistor and a 20 ohms resistor connected in a potential divider circuit. What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

372.

Which component is represented by this circuit symbol?

a)

bell

b)

fuse

c)

relay

d)

transformer

373.

A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots a graph of her results. Which circuit should she use?

a)

A

b)

B

c)

C

d)

D

374.

A thermistor is used in a circuit to control a piece of equipment automatically. What might this circuit be used for?

a)

lighting an electric lamp as it becomes faster

b)

ringing an alarm bell if a locked door is opened

c)

switching on a water heater at a pre-determined time

d)

turning on an air conditioner when the temperature rises

375.

A student connects a variable potential divider circuit.

a)

A

b)

B

c)

C

d)

D

376.

A circuit is connected for use as a potential divider. The resistance of resistor X is 10 ohms. When the resistance of the variable resistor Y is 20 ohms. What is the reading on the voltmeter?

a)

4V

b)

6V

c)

8V

d)

12V

377.

The four circuits shown all include an a.c. power supply, two diodes and a lamp. In which is there a rectified current in the lamp?

a)

A

b)

B

c)

C

d)

D

378.

Which circuit shows the directions of the conventional current I and the flow of electrons?

a)

A

b)

B

c)

C

d)

D

379.

In the circuit shown, only one of the fuses has blown, but none of the lamps is lit. Which fuse has blown?

a)

A

b)

B

c)

C

d)

D

380.

An appliance is connected to a mains supply. Its circuit also contains a switch and a fuse. Which circuit shows the fuse in the correct position?

a)

A

b)

B

c)

C

d)

D

381.

An air conditioner and television are both connected to the same circuit.

a)

A

b)

B

c)

C

d)

D

382.

The resistance of a wire depends on its length l and on its cross-sectional area A.

The resistance is...

a)

directly proportional to l and directly proportional to A

b)

directly proportional to l and inversely proportional to A

c)

inversely proportional to l and directly proportional to A

d)

inversely proportional to l and inversely proportional to A

383.

What happens when the current in the circuit is 2A and what happens when the current is 18A?

a)

A

b)

B

c)

C

d)

D

384.
Which word means how hard it is for electrons to flow?
a)
Current
b)
Voltage
c)
Resistance
d)
Power
385.
The mathematical relationship between Voltage, Current, and Resistance:
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
386.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
Not enough info
387.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
Not enough info
388.
In a series circuit, which of the following is the same throughout the circuit?
a)
Resistance
b)
Voltage
c)
Current
d)
Power
389.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
390.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
391.
As the number of resistors increase, the total resistance ___________ and the total current ____________
a)
Decreases, decreases
b)
Decreases, increases
c)
Increases, increases
d)
Increases, decreases
392.
What resistance is needed to cause a 20A current flow with a 100V battery?
a)
0.2Ώ
b)
2000Ώ
c)
200Ώ
d)
5Ώ
393.
What voltage is needed to produce 2A of current through a 10Ω resistor?
a)
20V
b)
0.2V
c)
5V
d)
2V
394.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

395.

Which component matches this symbol?

a)

LDR

b)

LED

c)

Diode

d)

Bulb

396.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

397.

Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?

a)
b)
c)
d)
398.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

fuse

c)

resistor

d)

diode

399.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

LDR

400.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

cell

401.

Which of these answers gives the correct way of connecting each meter?

a)

A

b)

B

c)

C

d)

D

402.

What is the correct name for the unit for measuring resistance?

a)

amp

b)

volt

c)

coulomb

d)

ohm

403.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

404.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What is the current through the resistor?

a)

2 mA

b)

2 A

c)

16 mA

d)

16 A

405.

Which type of circuit is more suitable for the following 2 applications:

a)

A

b)

B

c)

C

d)

D

406.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

407.

Which of these answers gives the correct change in resistance for each component?

a)

A

b)

B

c)

C

d)

D

408.

The safety device that limits the current flow in a plug is the

a)

fuse

b)

cable grip

c)

earth wire

d)

insulation

409.

Where should the earth wire be connected inside a metal toaster?

a)

power supply

b)

heating element

c)

metal casing

d)

Earth wire not needed in a metal appliance

410.

This table describes electrical properties of parts of a mains plug. Which answer is correct?

a)

A

b)

B

c)

C

d)

D

411.

This hair dryer has a case made of plastic. It only needs 2 wires for safe use, and does not need an earth wire. Devices like this are called

a)

neutral devices

b)

safety checked

c)

current controlled

d)

double insulated

412.

When a current passes through a resistance wire it gets hot. Which of these appliances does NOT use this effect?

a)

Toaster

b)

Microwave

c)

Hairdryer

d)

Kettle

413.

Which of these is the correct formula for electrical power?

a)

P = IV

b)

V = IR

c)

V = PI

d)

P = V/I

414.

A 240 volt, 3 amp heater is left running for 5 minutes.


Which of these gives the total energy output?

a)

3.6 kJ

b)

216 kJ

c)

72 kJ

d)

0.9 kJ

415.

Which of the following is the correct unit for charge?

a)

coulomb

b)

capacitance

c)

current

d)

charge

416.

A 6 V light bulb is switched on for a short time. A 6 V battery transfers 2 C of charge to the bulb in this time. What energy has been transferred?

a)

0.33 J

b)

3 J

c)

6 J

d)

12 J

417.

Which of the following is the definition of a 'volt'?

a)

a joule per coulomb

b)

a watt per coulomb

c)

a joule per amp

d)

a watt per ohm

418.

The electrical resistance of insulators is

a)

High

b)

Low

c)

Zero

d)

Infinitely high

419.

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

a)

440 W

b)

110 W

c)

55 W

d)

0.0023 W

420.
a)
b)
c)
d)
421.

In the circuits shown, all resistors are identical

Which circuit has the least resistance?

a)
b)
c)
d)
422.
a)

A

b)

B

c)

C

d)

D

423.

What would be the reading on the voltmeter?

a)

2 V

b)

6 V

c)

4 V

d)

8 V

424.

a)

A

b)

B

c)

C

d)

D

425.

A teacher writes a set of notes about two non-identical bulbs which are connected in parallel

He makes one mistake. Which of the statements below is incorrect?

a)

They have the same current flowing through them

b)

They have the same potential difference across them

c)

They can be switched on and off individually

d)

If one bulb blows, the other will continue to work

426.

What is component Z ?

(a)  

427.

What is component B

a)

Thermistor

b)

Resistor

c)

Light Dependent Resistor

d)

Relay

428.

How are resistance and length interrelated ?

a)

Directly Proportional

b)

Inversely Proportional

429.

How is resistance and cross-sectional area interrelated?

a)

Directly Proportional

b)

Inversely Proportional

430.

What does the voltmeter read?

a)

2 V

b)

3 V

c)

10 V

d)

1 V

431.

What is the reading of the ammeter

a)

0.32 A

b)

0.44 A

c)

1 A

d)

0.28 A

432.

What happens to the resistance of the LDR when it is dark

a)

Resistance decreasae

b)

Resistance increases

c)

Resistance is constant

d)

Resistance is unchanged

433.

What happens to a thermistor on a hot day

a)

Resistance increases

b)

Resistance decreases

c)

Resistance is constant

d)

Resistance is unchanged

434.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

435.

Which component matches this symbol?

a)

LDR

b)

LED

c)

Diode

d)

Bulb

436.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

437.

Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?

a)
b)
c)
d)
438.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

fuse

c)

resistor

d)

diode

439.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

LDR

440.

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

a)

bulb

b)

resistor

c)

diode

d)

cell

441.

Which of these answers gives the correct way of connecting each meter?

a)

A

b)

B

c)

C

d)

D

442.

What is the correct name for the unit for measuring resistance?

a)

amp

b)

volt

c)

coulomb

d)

ohm

443.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What does p.d. stand for?

a)

potential difference

b)

potential divider

c)

power difference

d)

power divider

444.

A computer circuit board contains a 4 kΩ resistor and has a p.d. of 8 V across it.


What is the current through the resistor?

a)

2 mA

b)

2 A

c)

16 mA

d)

16 A

445.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

446.

Which of these answers gives the correct change in resistance for each component?

a)

A

b)

B

c)

C

d)

D

447.

The safety device that limits the current flow in a plug is the

a)

fuse

b)

cable grip

c)

earth wire

d)

insulation

448.

Which of these is the correct formula for electrical power?

a)

P = IV

b)

V = IR

c)

V = PI

d)

P = V/I

449.

A 240 volt, 3 amp heater is left running for 5 minutes.


Which of these gives the total energy output?

a)

3.6 kJ

b)

216 kJ

c)

72 kJ

d)

0.9 kJ

450.

Which of the following is the correct unit for charge?

a)

coulomb

b)

capacitance

c)

current

d)

charge

451.

A 6 V light bulb is switched on for a short time. A 6 V battery transfers 2 C of charge to the bulb in this time. What energy has been transferred?

a)

0.33 J

b)

3 J

c)

6 J

d)

12 J

452.

Which of the following is the definition of a 'volt'?

a)

a joule per coulomb

b)

a watt per coulomb

c)

a joule per amp

d)

a watt per ohm

453.

A wire has a certain electrical resistance. The diameter and length of the wire may be changed. Which pair of changes must cause the resistance of the wire to increase?

a)

A

b)

B

c)

C

d)

D

454.

The table described four different resistance wires. They are all made from the same metal. Which wire has the smallest resistance?

a)

A

b)

B

c)

C

d)

D

455.

What is the unit of electromotive force?

a)

ampere

b)

newton

c)

ohm

d)

volt

456.

What is the unit of electrical power?

a)

ampere

b)

joule

c)

volt

d)

watt

457.

Four students are each given an identical resistor and asked to find its resistance. They each measure the potential difference across the resistor and the current in it. One student makes a mistake. Which row shows the results of the student that makes a mistake?

a)

A

b)

B

c)

C

d)

D

458.

The circuit shown contains a battery, a 6 ohms resistor and two meters X and Y. One meter records current and one meter records potential difference.

a)

A

b)

B

c)

C

d)

D

459.

Which quantities is a voltmeter used to measure?

a)

current and e.m.f. only

b)

current and p.d. only

c)

e.m.f. and p.d. only

d)

e.m.f., current and p.d

460.

What is the ammeter reading with the switch closed?

a)

A

b)

B

c)

C

d)

D

461.

What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

462.

The diagrams show four current-voltage graphs. Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?

a)

A

b)

B

c)

C

d)

D

463.

A resistor of resistance R is connected to a battery of e.m.f. V. There is a current I in the resistor. Power P is dissipated by the resistor, and in time t the energy transferred is E. Which expression is correct?

a)

A

b)

B

c)

C

d)

D

464.

In the circuit shown, the ammeter reads 2.0A and the voltmeter reads 12V. How much energy is transferred by the resistor in 10 seconds?

a)

A

b)

B

c)

C

d)

D

465.

The circuit shown contains three ammeters, X, Y and Z. Which ammeter has the largest reading?

a)

A

b)

B

c)

C

d)

D

466.

P and Q are the circuit symbols for two electrical components. Which components are represented by P and by Q?

a)

A

b)

B

c)

C

d)

D

467.

The diagram shows two resistors connected in a circuit. What could be the combined resistance of this arrangement of resistors?

a)

A

b)

B

c)

C

d)

D

468.

What are lamps in a house lighting circuit connected in parallel rather than in series?

a)

if one lamp stops working, the remaining lamps become brighter

b)

Less current is taken from the power supply

c)

The lamps can be turned off independently using switches

d)

When move lamps are added, their brightness decreases

469.

Four lamps are each labelled 240V. In which circuit do all four lamps have normal brightness?

a)

A

b)

B

c)

C

d)

D

470.

The diagram shows a potential divider connected to two voltmeters P and Q. The resistance of the variable resistor is decreased. Which row shows what happens to the reading on each voltmeter.

a)

A

b)

B

c)

C

d)

D

471.

What is the total resistance of this arrangement?

a)

A

b)

B

c)

C

d)

D

472.

The diagram shows a 10 ohms resistor and a 20 ohms resistor connected in a potential divider circuit. What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

473.

Which component is represented by this circuit symbol?

a)

bell

b)

fuse

c)

relay

d)

transformer

474.

A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots a graph of her results. Which circuit should she use?

a)

A

b)

B

c)

C

d)

D

475.

A circuit is connected for use as a potential divider. The resistance of resistor X is 10 ohms. When the resistance of the variable resistor Y is 20 ohms. What is the reading on the voltmeter?

a)

4V

b)

6V

c)

8V

d)

12V

476.

Which circuit shows the directions of the conventional current I and the flow of electrons?

a)

A

b)

B

c)

C

d)

D

477.

The resistance of a wire depends on its length l and on its cross-sectional area A.

The resistance is...

a)

directly proportional to l and directly proportional to A

b)

directly proportional to l and inversely proportional to A

c)

inversely proportional to l and directly proportional to A

d)

inversely proportional to l and inversely proportional to A

478.

What happens to a thermistor on a hot day

a)

Resistance increases

b)

Resistance decreases

c)

Resistance is constant

d)

Resistance is unchanged

479.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

480.

Which component matches this symbol?

a)

LDR

b)

LED

c)

Diode

d)

Bulb

481.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

482.

Which of these 4 circuits can be used to measure how the current varies with a change in voltage across a bulb?

a)
b)
c)
d)
483.

To get a large current to flow in a wire, you can either

a)

increase the wire resistance or increase the supply voltage

b)

increase the wire resistance or decrease the supply voltage

c)

decrease the wire resistance or increase the supply voltage

d)

decrease the wire resistance or decrease the supply voltage

484.

In the circuit shown, only one of the fuses has blown, but none of the lamps is lit. Which fuse has blown?

a)

A

b)

B

c)

C

d)

D

485.

A strong electromagnet is used to attract pins.

What happens when the current in the coil is halved?

a)

No pins are attracted.

b)

Some pins are attracted, but not as many.

c)

The same number of pins is attracted.

d)

More pins are attracted.

486.

The diagram shows a transformer.

The input voltage is 240 V.


What is the output voltage?

a)

6 V

b)

12 V

c)

20 V

d)

40 V

487.

A magnet is suspended from a spring so that it can move freely inside a stationary coil. The coil is connected to a sensitive centre-zero galvanometer.

The magnet repeatedly moves slowly up and down.


What does the galvanometer show?

a)

a constantly changing reading

b)

a steady reading to the left

c)

a steady reading to the right

d)

a steady reading of zero

488.

A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An alternating voltage of 25.0 V is connected across the primary coil.


What is the voltage across the secondary coil?

a)

12.5 V

b)

50.0 V

c)

100 V

d)

200 V

489.

The diagram shows a flat, rectangular coil placed between the poles of a magnet.

There is a current in the coil that makes it turn in the direction shown in the diagram.


Which change would make the coil turn in the opposite direction?

a)

decreasing the current in the coil

b)

increasing the number of turns on the coil

c)

reversing both the direction of the current in the coil and the poles of the magnet

d)

reversing only the direction of the current in the coil

490.

Which diagram represents the voltage output of a simple a.c. generator?

a)

A

b)

B

c)

C

d)

D

491.

A step-up transformer is used before electricity is transmitted by overhead cables.


Which statement explains why the step-up transformer is used?

a)

It increases the current to increase the speed at which the electricity travels.

b)

It increases the current to reduce energy loss in the cables.

c)

It increases the voltage to increase the speed at which the electricity travels.

d)

It increases the voltage to reduce energy loss in the cables.

492.

A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet.

A force acts on the wire XY because of the magnetic field.

Each of the following actions is carried out separately.

● The current in the wire XY is reversed.

● The magnetic field is reversed.

● Both the current in the wire XY and the magnetic field are reversed at the same time.


How many of these actions cause the direction of the force on the wire XY to be reversed?

a)

0

b)

1

c)

2

d)

3

493.

A current-carrying coil in a magnetic field experiences a turning effect.

How can the turning effect be increased?

a)

Increase the number of turns on the coil.

b)

Reduce the size of the current.

c)

Reverse the direction of the magnetic field.

d)

Use thinner wire for the coil.

494.

A student investigates electromagnetic induction. She has a bar magnet and a coil of wire that is connected to a sensitive ammeter.

Which movement does not cause a reading on the ammeter?

a)

moving the coil to the right

b)

moving both the magnet and the coil to the left at the same speed

c)

moving both the magnet and the coil towards each other at the same speed

d)

moving the magnet to the left

495.

An electric current is passed through a coil of wire.

Which diagram shows the shape of the magnetic field produced in the middle of the coil?

a)
b)
c)
d)
496.

The diagram shows a simple step-down transformer used to decrease a voltage.

Which part is the primary coil?

a)

A

b)

B

c)

C

d)

D

497.

Which diagram represents the direction of the magnetic field around a straight wire carrying a current out of the page?

a)

A

b)

B

c)

C

d)

D

498.
What kind of magnet can be turned on and off?
a)
refrigerator magnet
b)
electromagnet
c)
magnetite
d)
iron
499.

The diagram shows a 12 V d.c. power supply connected across a coil with a metal core.


The core becomes a magnet when the current is switched on. It remains a magnet after the current is switched off.

From which metal is the core made?

a)

aluminium

b)

copper

c)

soft iron

d)

steel

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