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Worksheets

IGCSE Mag, Elec, & Electromag

Total questions: 137

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

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

2.

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

3.

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

4.

What is the unit of electromotive force?

a)

ampere

b)

newton

c)

ohm

d)

volt

5.

What is the unit of electrical power?

a)

ampere

b)

joule

c)

volt

d)

watt

6.

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

7.

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

a)

A

b)

B

c)

C

d)

D

8.

A student connects a variable potential divider circuit.

a)

A

b)

B

c)

C

d)

D

9.

What are the logic states at output X and at output Y?

a)

A

b)

B

c)

C

d)

D

10.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

11.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

12.

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)
13.
a)

A

b)

B

c)

C

d)

D

14.

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

15.

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

16.

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

17.

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

a)

A

b)

B

c)

C

d)

D

18.

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

19.

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

20.

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

21.

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

22.

Which of these is not a magnetic material?

a)

aluminium

b)

steel

c)

nickel

d)

iron

23.

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

24.

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

a)

Horseshoe magnet

b)

electric cable

c)

glass rod

d)

compass

25.

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

26.

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

27.

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

28.

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

29.

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

30.

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

a)

A

b)

B

c)

C

d)

D

31.

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


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

a)

upwards

b)

downwards

c)

rotate clockwise

d)

rotate anticlockwise

32.

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

a)

loudspeaker

b)

motor

c)

lightbulb

d)

electric fan

33.

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

a)

Increase the current

b)

Use stronger magnets

c)

Use a coil with many turns

d)

Make the wire thicker

34.

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

a)

Induction

b)

Reduction

c)

Generation

d)

Production

35.

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


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

a)

A

b)

B

c)

C

d)

D

36.

Which of these methods will not generate a voltage?

a)

Rotate a coil in a magnetic field

b)

Rotate a magnet inside a coil

c)

Move a magnet past a wire

d)

Move a wire past a coil

37.

What does 'induction' mean?

a)

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

b)

The production of a force on a conductor due to friction

c)

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

d)

The production of a voltage in a conductor due to friction

38.

The image shows an aluminium rod placed between 2 magnets.


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

a)

Replace the north pole with another south pole

b)

Change the aluminium rod for a copper rod

c)

Move the rod upwards or downwards

d)

Heat the rod

39.

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


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

a)

Drop the south pole through first

b)

Add more turns to the coil

c)

Move the magnet slowly through the coil

d)

Use a stronger magnet

40.

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


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

a)

Drop the south pole through first

b)

Add more turns to the coil

c)

Move the magnet slowly through the coil

d)

Use a stronger magnet

41.

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


What is the name given to this device?

a)

A loudspeaker

b)

A dynamo

c)

A generator

d)

A microphone

42.

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.

43.

The electrical resistance of insulators is

a)

High

b)

Low

c)

Zero

d)

Infinitely high

44.

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

45.
a)
b)
c)
d)
46.

In the circuits shown, all resistors are identical

Which circuit has the least resistance?

a)
b)
c)
d)
47.
a)

A

b)

B

c)

C

d)

D

48.

What would be the reading on the voltmeter?

a)

2 V

b)

6 V

c)

4 V

d)

8 V

49.

a)

A

b)

B

c)

C

d)

D

50.

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

51.

What is component Z ?

(a)  

52.

What is component B

a)

Thermistor

b)

Resistor

c)

Light Dependent Resistor

d)

Relay

53.

How are resistance and length interrelated ?

a)

Directly Proportional

b)

Inversely Proportional

54.

How is resistance and cross-sectional area interrelated?

a)

Directly Proportional

b)

Inversely Proportional

55.

What does the voltmeter read?

a)

2 V

b)

3 V

c)

10 V

d)

1 V

56.

What is the reading of the ammeter

a)

0.32 A

b)

0.44 A

c)

1 A

d)

0.28 A

57.

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

58.

What happens to a thermistor on a hot day

a)

Resistance increases

b)

Resistance decreases

c)

Resistance is constant

d)

Resistance is unchanged

59.

Which component matches this symbol?

a)

LDR

b)

Fuse

c)

Cell

d)

Variable resistor

60.

Which component matches this symbol?

a)

LDR

b)

LED

c)

Diode

d)

Bulb

61.

Which component matches this symbol?

a)

fuse

b)

LDR

c)

thermistor

d)

LED

62.

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)
63.

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

64.

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

65.

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

66.

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

a)

A

b)

B

c)

C

d)

D

67.

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

a)

amp

b)

volt

c)

coulomb

d)

ohm

68.

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

69.

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

70.

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

71.

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

a)

A

b)

B

c)

C

d)

D

72.

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

a)

fuse

b)

cable grip

c)

earth wire

d)

insulation

73.

Which of these is the correct formula for electrical power?

a)

P = IV

b)

V = IR

c)

V = PI

d)

P = V/I

74.

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

75.

Which of the following is the correct unit for charge?

a)

coulomb

b)

capacitance

c)

current

d)

charge

76.

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

77.

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

78.

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

79.

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

80.

What is the unit of electromotive force?

a)

ampere

b)

newton

c)

ohm

d)

volt

81.

What is the unit of electrical power?

a)

ampere

b)

joule

c)

volt

d)

watt

82.

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

83.

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

84.

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

85.

What is the ammeter reading with the switch closed?

a)

A

b)

B

c)

C

d)

D

86.

What is the reading on the voltmeter?

a)

A

b)

B

c)

C

d)

D

87.

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

88.

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

89.

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

90.

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

a)

A

b)

B

c)

C

d)

D

91.

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

92.

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

93.

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

94.

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

a)

A

b)

B

c)

C

d)

D

95.

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

96.

What is the total resistance of this arrangement?

a)

A

b)

B

c)

C

d)

D

97.

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

98.

Which component is represented by this circuit symbol?

a)

bell

b)

fuse

c)

relay

d)

transformer

99.

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

100.

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

101.

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

a)

A

b)

B

c)

C

d)

D

102.

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

103.

What device is shown in the picture?

a)

Generator

b)

Motor

c)

Transformer

d)

Circuit

104.
What is the transfer of electricity in a motor?
a)
chemical to mechanical 
b)
electrical to mechanical
c)
mechanical to electrical 
d)
physical to potential 
105.

What do you need to turn an iron nail into an electromagnet?

a)

Battery and string

b)

Battery, pencil and wire

c)

Battery and wire

d)

Peanut butter, lampshade, hand sanitizer

106.

Why did this simple electric motor work?

a)

The current from the battery induces a magnetic field in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

b)

The electromagnet on top of the battery pulls on the magnetic copper wire

c)

The magnet induces a current in the copper loop which makes it rotate.

d)

The magnetic field from the battery induces an electric current in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

107.

Electromagnetic induction occurs in a coil when there is a change in

a)

electric field in the coil

b)

magnetic field in the coil

c)

voltage in the coil

108.
This picture shows a turbine generator used to produce electricity at a geothermal power plant.
Electricity is produced by using steam to _____________.
a)
heat the turbine generators
b)
spin the turbine generators 
c)
reduce friction in the turbine generators
d)
reduce emissions from the turbine generators
109.

How are electromagnets different from permanent magnets?

a)

magnets can be turned on/off

b)

you can turn an electromagnet on/off

c)

magnets are more powerful

d)

magnets have a North and South pole

110.

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

111.

A device that transforms electrical energy to mechanical energy is a

a)

generator

b)

motor

c)

transformer

d)

magnet

112.

A device that transforms mechanical energy to electrical energy is a

a)

generator

b)

motor

c)

transformer

d)

magnet

113.

Unlike an electromagnet, a permanent magnet

a)

does not need electricity to work.

b)

cannot lift heavy objects and release them.

c)

can easily increase or decrease its magnetic field.

d)

can shut down its magnetic field with the flip of a switch.

114.
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
115.
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.
116.

In an electric generator, the energy transformation begins as ----

a)

electrical and becomes chemical

b)

mechanical and becomes electrical

c)

electrical and becomes mechanical

d)

mechanical and becomes chemical

117.
The water turbine drives the generator which converts  ................
a)
The mechanical energy to electrical energy
b)
The electrical energy to electrical energy
c)
None
118.
While electric current is flowing through a wire, what surrounds the wire?
a)
a magnetic field
b)
a glowing light
c)
neutrons
d)
protons
119.
What would increase the strength of an electromagnet?
a)

Increasing the amount of current flowing through the wire.

b)

Inserting a wooden core inside the coil

c)

Changing the direction of the current

d)

Decreasing the number of coils of wire

120.

What must the student do in the picture, in order to induce electricity and move the the galvonometer

a)

nothing

b)

move the magnet

c)

add more loops of wire

d)

unplug the galvnonmeter

121.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
122.

What can you do to make electromagnets stronger?

a)

Increase number of coils of wire.

b)

Increase number of batteries used.

c)

Both A and B.

d)

Neither A nor B.

123.

In an electrical generator, the energy transformation begins as ___________ and becomes ____________.

a)

mechanical; electrical

b)

electrical; mechanical

c)

electrical; chemical

d)

mechanical; chemical

124.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
125.
What is the transfer of electricity in a generator?
a)
Mechanical to Electrical 
b)
Physical to Potential 
c)
Electrical to Mechanical
d)
Yogurt to Light
126.

What would happen if you broke a bar magnet into 8 pieces?

a)

You would have 8 half magnets

b)

You would have 4 complete magnets

c)

You would have 8 complete magnets

d)

They wouldn't be magnets anymore

127.

A transformer actually transforms

a)

voltage

b)

magnetic field lines

c)

generators into motors

128.

A device that transforms electric energy to mechanical or kinetic energy is a

a)

generator

b)

motor

c)

transformer

d)

magnet

129.

A device that transforms electrical energy to mechanical energy is a

a)

generator

b)

motor

c)

transformer

d)

magnet

130.

How are electromagnets different from permanent magnets?

a)

magnets can be turned on/off

b)

you can turn an electromagnet on/off

c)

magnets are more powerful

d)

magnets have a North and South pole

131.
Based on this picture, which side will have a higher voltage?
a)
Secondary
b)
Primary
c)
Both sides have the same voltage
d)
Cannot be determined
132.
What is the device seen here?
a)
generator
b)
electric motor
c)
electromagnet
d)
magnet
133.

What device is shown in the picture?

a)

Generator

b)

Motor

c)

Transformer

d)

Circuit

134.

Why did this simple electric motor work?

a)

The current from the battery induces a magnetic field in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

b)

The electromagnet on top of the battery pulls on the magnetic copper wire

c)

The magnet induces a current in the copper loop which makes it rotate.

d)

The magnetic field from the battery induces an electric current in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet

135.
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
136.
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
137.

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.

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