Cambridge IGCSE - Physics

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Cambridge IGCSETM
ACE YOUR

PHYSICS

Workbook

Chia Soon Chai

Contents Penerbitan Pelangi Sdn Bhd. All Rights Reserved iii
iv
Preface v
Assessment Overview
List of Important Formulae 1
9
Chapter 1 Measurements and Units 21
Chapter 2 Forces and Motion 32
Chapter 3 Forces and Pressure 42
Chapter 4 Forces and Energy 52
Chapter 5 Thermal Effects 62
Chapter 6 Waves and Sounds 73
Chapter 7 Waves and Light 84
Chapter 8 Electricity 95
Chapter 9 Electromagnetism 104
Chapter 10 Atoms and Radioactivity
Chapter 11 The Earth in Space 110

Answers CoCnotennttesntsvii

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ii AAcTeoYpoicuarl IAGpCprSoEach to Mathematics

1 Measurements and Units

Part 1: Multiple-choice Questions
Answer all questions. For each question, there are four possible answers. Choose the best and correct answer.

1. Which of the following SI units is correct 4. Which instrument is most suitable for
for its quantity? measuring the thickness of a coin?
A measuring tape
B metre rule
C spring balance
D micrometer screw gauge

5. A student wants to measure the water
volume using a measuring cylinder.

mL

50 50

40

30 40

20

10
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A time minute
B temperature Celsius
C length centimetre
D mass kilogram

2. The dimensions of a box are shown in the
following figure.

What is the water volume?
A 43 ml C 45 ml
What is the area of box? B 44 ml D 46 ml
A 3.60 cm2
B 5.60 cm2 6. A student wishes to take a reading from a
C 20.16 cm2 measuring cylinder. From which position
D 30.16 cm2 should he take the reading?

3. A student wants to measure the volume of AD
the solid shown in the following figure. B

7 cm

5 cm C
12 cm 7. Students can measure the volume of water

Which measuring device is most suitable using a measuring cylinder. Which
for this purpose? measuring technique would improve the
A manometer accuracy of the measurement?
B ruler A taking the reading from the bottom of
C vernier callipers
D micrometer screw gauge the water meniscus

Chapter 1 Measurements and Units 1

B taking the reading from the top of the B has magnitude has magnitude
water meniscus only and direction
has magnitude
C taking the reading from the top of the C has magnitude
measuring cylinder and direction only
has magnitude
D using the largest possible measuring D has magnitude and direction
cylinder and direction

8. A teacher uses a stopwatch to record the 1 2. The density of substance Z is 1.00 ×
time a runner takes to complete a lap. The 103 kg/m3. In which liquid will substance
following figure shows the stopwatch at the Z sink?
end of the first lap and the second lap.

liquid density / kg/m3

AA 9.90 × 102
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0 : 55 : 01 1 : 49 : 06 BB 1.01 × 103

CC 1.50 × 103

1st lap 2nd lap DD 2.00 × 103

How long did the runner take to complete Clone March 2012
the second lap of the race?
A 54.05 seconds 13. A 10 cm3 metal block has a density of
B 55.01 seconds 2000 kg/m3. What is the mass of the metal
C 109.06 seconds block?
D 149.06 seconds A 0.02 g C 2.00 g
B 0.20 g D 20.00 g

9. The following figure shows the time taken 1 4. The following table shows the measurements
by a runner to complete three laps in a of three objects.
competition.

min s 1/100 s min s 1/100 s object mass / g volume / cm3
0 : 00 : 07 2 : 15 : 19 A 90 64
B 35 27
C 150 50

Start End Which objects will float in a liquid with a
density of 2 g/cm3?
What is the average time for one lap? A objects A and B
A 0.07 seconds C 45.04 seconds B objects A and C
B 15.19 seconds D 135.19 seconds C objects B and C
D objects A, B and C
10. Which of the following quantities is not a
vector quantity? 15. In a simple pendulum experiment, a
A velocity C mass student obtained the period P when using a
B displacement D acceleration bob of mass m and a pendulum of length L.
What will be the new period if the student
11. Which of the following pairs is correct? uses double the mass of the bob and the

scalar quantity vector quantity same pendulum length L?
A 0.5P C 2.0P
A has magnitude has direction B 1.0P D 4.0P
only only

2 CAcaemYboruidr gPehIyGsiCcsSETM

Part 2: Structured Questions
Answer all questions.
1. (a) Define vector and scalar quantities.

[2]

(b) Circle the vector quantities in the following list.

Speed Velocity Displacement Force Energy Power
[3]
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[Total: 5]

2. A student is given 100 sheets of paper. He wants to measure the thickness of a single sheet of
paper.

(a) Suggest the most suitable instrument for this purpose.

[1]

(b) Describe how the student measures the thickness of a single sheet of paper.

[3]
[Total: 4]
3. A scientist needs to find the density of irregular solids A, B and C. He is given a measuring
cylinder and a spring balance.
(a) Describe how the experiment is carried out.

[5]
Chapter 1 Measurements and Units 3

(b) The experiment results are shown in Table 3.1. Complete the table.

Table 3.1

mass / g solid A solid B solid C
volume / cm3 103 190 80
density / g/cm3 23 19
2.45

[3]

(c) The density of glass is 4200 kg/m3. Which of the solids in Table 3.1 is glass?

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[Total: 9]

4. (a) Define the term density.

[1]
(b) A sample of ethanol has a volume of 220 cm3. By taking the density of ethanol as

790 kg/m3, calculate the mass of the sample of ethanol.

Mass: [3]
(c) State and explain why a solid floats in ethanol but not in water. [2]
[Total: 6]

5. A student is given a metal block as shown in Fig. 5.1.

7 cm

5 cm

12 cm

Fig. 5.1
(a) Calculate the volume of the block.

Volume: [2]

4 CAcaemYboruidr gPehIyGsiCcsSETM

(b) The metal block has a mass of 3.15 kg. Calculate the density of the metal block.

Density: [2]

(c) Table 5.1 lists the densities of some common metals.

metal aluminium Table 5.1 copper lead
density / g/cm3 2.7 8.9 11.3
iron
7.5
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Using the information in Table 5.1, what do you think the metal block is made from?

[1]
[Total: 5]

6. A student carried out a simple pendulum experiment. He was given bobs with different masses,
a stand and a clamp, a stopwatch and a piece of string.

BC
A

Fig. 6.1

(a) Define amplitude.

[1]
(b) Describe how the experiment was carried out. You may draw a diagram to illustrate this.

Chapter 1 Measurements and Units 5

(c) What will happen when [4]
(i) the mass of the bob is doubled?
(ii) the length of the string is doubled? [3]
(iii) the amplitude is halved? [Total: 8]

Clone March 2020

7. Fig. 7.1 shows a stack of coins.

120 cm

Fig. 7.1
(a) Calculate the average thickness of one coin.
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Average thickness: cm [2]
(b) Fig. 7.2 shows the coins, a measuring cylinder and a beaker of water.

Coins Measuring Water
cylinder
6 CAcaemYboruidr gPehIyGsiCcsSETM
Fig. 7.2

Describe how the student can measure the volume of one coin using the apparatus given.

[4]

(c) Using the following information:
Mass of 6 coins = 80 g
Volume of 6 coins = 50 cm3
Calculate the density of one coin.
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Density: [3]
[Total: 9]

Clone March 2021

8. Fig. 8.1 shows the results obtained by a student when finding the volume of an irregular-shaped
stone A.

cm3 cm3
100 100
90 90
80 80
70 70
60 60
50 50
40 40
30 30
20 20

Stone

10 10

Fig. 8.1
(a) Calculate the volume of stone A.

Volume: cm3 [2]

Chapter 1 Measurements and Units 7

(b) Another stone, B, has a volume of 14.8 cm3 and a mass of 88.5 g. Calculate the density of
stone B.

Density: unit [3]

(c) A stone with a mass of 16.8 g have a weight of 0.168 N.
State two differences between mass and weight.

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[Total: 7]

8 CAcaemYboruidr gPehIyGsiCcsSETM

2 Forces and Motion

Part 1: Multiple-choice Questions
Answer all questions. For each question, there are four possible answers. Choose the best and correct answer.

Clone March 2010 What is the total distance travelled by the
student?
1. Which distance-time graph shows an object A 184 m
moving at its greatest speed? B 185 m
A C 194 m
D 195 m
Time
3. The following figure shows a speed-time
B graph.

Speed, m/s

25
Distance

Reserved

Distance

All Rights

Time Bhd. 5 11 18 Time, s

PenerbitDiastanncePelangiDistSandcenC What is the average speed of the object?
A 17 m/s C 30 m/s
Time B 25 m/s D 300 m/s

D 4. The following graph shows an object falling
from a height.
Time
Speed, m/s
2. The following figure shows the motion of
a student walking to school. A

Speed, m/s Time, s
20
10 Which of the following describes the
motion in part A?
5 16 20 Time, s A no speed
B no acceleration
C increasing speed
D increasing acceleration

Chapter 2 Forces and Motion 9

5. The weight of sample A on the moon is What is the velocity after collision?
90 N. What is the mass of sample A on (Assume both toy cars stick together after
Earth? collision.)
(Assume the gravitational strength of the A 2.5 m/s C 5.0 m/s
moon is 1/6 times the gravitational strength B −2.5 m/s D −5.0 m/s
of the Earth.)
A 9 kg C 54 kg 1 0. What is the principle of the conservation
B 15 kg D 540 kg of momentum?
A the total momentum before the
6. Which of the following are correct about collision = the total momentum after
mass and weight? the collision
B the total momentum equals to zero
mass weight C the momentum before the collision –
A force measured in the momentum after the collision
D the momentum before the collision +
newtons the momentum after the collision
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B measured in measured in kg
newtons
1 1. The following cases are in equilibrium
C measured in kg force except
A anticlockwise moment = clockwise
D measured in measured in kg moment
newtons B normal force = weight
C resultant force = 0
7. The time taken for an object to fall from a D an object moving on a curved path
height of ℎ m from the Earth's surface is with constant speed
t s. If the gravitational acceleration on an
unknown planet is 2 m/s2, what is the time 1 2. In the following diagrams, which
taken for the object to fall from the same combination of forces gives the largest
height on the unknown planet? acceleration?
A same as t s A 500 N
B less than t s
C longer than t s 300 N
D none of the above
B 500 N
8. A toy car of mass 2 kg accelerates from rest
to a velocity of 10 m/s in the same direction. 50 N

What is the impulse provided to cause this C 300 N
acceleration?
A 2 kg m/s 500 N
B 5 kg m/s
C 10 kg m/s D 300 N
D 20 kg m/s
50 N
9. Two toy cars A and B both have a mass of
2 kg. Toy car A moves with a velocity of 13. Which of the following is the impulsive
5 m/s to the right while toy car B moves force formula?
with a velocity of 10 m/s to the left. A change of velocity × time
B change of velocity × mass
AB
C change of velocity × time
mass
change of velocity × mass
D time

10 CAcaemYboruidr gPehIyGsiCcsSETM

1 4. The relationship between the load F and 15. An experiment is carried out to measure
the extension of a spring x is given by the the extension of a spring for different loads.
equation: The results are shown in the following
F = kx table.

where k is the spring constant. What is the load / N 0 1.0 2.0 3.0 4.0
unit of k?
A kg/m length / cm 12.8 13.2 14.1 14.5
B kg/m2
C N/m extension / cm 0 0.4 0.8 1.3 1.7
D N/m2
Which is the value of the missing figure
from the table?
A 13.4 cm C 13.6 cm
B 13.5 cm D 14.0 cm
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Part 2: Structured Questions
Answer all questions.
1. Fig. 1.1 shows a velocity-time graph of the motion of a cyclist as she travels from one stage to

the next in a race.

Velocity, m/s

10 B C

A D Time, s
10 50 80

Fig. 1.1

(a) Describe the motion of the cyclist, in terms of acceleration

(i) from A to B.

(ii) from B to C.

(iii) from C to D.

[3]

(b) Calculate the acceleration from A to B.

acceleration: [2]

Chapter 2 Forces and Motion 11

(c) Calculate the deceleration from C to D.

deceleration: [2]
(d) Calculate the average speed of the cyclist.

average speed: [2]
[Total: 9]
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2. Sarah travels by car from her home to the grocery store. The motion throughout the whole
journey is as follows.

• uniform acceleration of 5 m/s2 for 5 seconds from rest
• constant speed for 8 seconds
• uniform acceleration of 3 m/s2 for 3 seconds
• uniform deceleration for 10 seconds

(a) Sketch the speed-time graph of the car.

(b) Calculate the distance between Sarah’s home and the grocery store. [4]
[3]
distance: [2]

(c) Calculate the average speed.

average speed:

12 CAcaemYboruidr gPehIyGsiCcsSETM

(d) On the return journey, Sarah drives around a roundabout. Explain the force acting on the
car as she drives at a constant speed.

[2]
[Total: 11]
3. (a) Fig. 3.1 shows the result of a motion recorded on a ticker tape. The machine makes a dot
on the tape every 0.02 s.

1 cm
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Fig. 3.1 [1]
(i) From Fig. 3.1, what can you conclude about the motion?

(ii) Calculate the average speed.

average speed: [2]
(b) The student increases the mass of the load and the result is shown in Fig. 3.2.

1 cm

Fig. 3.2
From Fig. 3.2:
(i) Calculate the average speed between the first and second dot.

average speed: [2]

Chapter 2 Forces and Motion 13

(ii) Calculate the average speed between the fourth and fifth dot.

average speed: [2]

(iii) Calculate the acceleration.

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4. Fig. 4.1 shows a moving truck. The mass of the truck is 1500 kg. [Total: 9]

Force from
engine 2200 N

Frictional force
1200 N

Fig. 4.1
(a) Explain the term balanced force.

(b) On Fig. 4.1, mark the two missing forces. [1]
(c) Calculate the acceleration of the truck. [1]

acceleration: [2]
(d) Calculate the time required for the truck to speed up from 60 m/s to 80 m/s.

time: [2]
[Total: 6]

14 CAcaemYboruidr gPehIyGsiCcsSETM

5. An object M is hung using a wire with two tension forces as shown in Fig. 5.1.

60 N 45°45° 60 N

M

Fig. 5.1
(a) Using a scale diagram, find the resultant force. State the scale you used.

scale:Penerbitan Pelangi Sdn Bhd. All Rights Reserved[4]
magnitude of resultant force:

direction of resultant force:
(b) State the weight of the object M.

[1]
[Total: 5]

6. A parachutist jumps from a height and reaches his first constant speed after 5 s. He maintains
this constant speed for 2 s before he opens the parachute. He lands safely after 10 s.

(a) Sketch the velocity-time graph of the parachutist.

[3]
Chapter 2 Forces and Motion 15

(b) State what the constant speed is called and explain it.

[2]

(c) A heavier parachutist jumps from the same height. Sketch his first 5 s of motion on the
same graph. [2]

(d) Explain the difference in terms of forces.
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[2]
[Total: 9]

7. A student is investigating the relationship between the length of a spring and the load.
Table 7.1 shows the results of the experiment.

Table 7.1

weight / N 0 2 4 6 8 10
length / cm 12.0 12.6
extension / cm
0 0.6 1.2 1.8 2.4 3.0

(a) Complete the table. [2]

(b) Plot the graph of the extension of the spring against the load.

[3]

16 CAcaemYboruidr gPehIyGsiCcsSETM

(c) State and explain whether this spring obeys Hooke’s law. [2]
(d) Using the graph, calculate the spring constant.

Penerbitan Pelangi Sdn Bhd. All Rights Reserved [2]
spring constant:
(e) Describe how the graph might be shaped if the student added several more loads.

[2]
[Total: 11]

8. A student swings a bob with a constant speed as in Fig. 8.1.

P

Fig. 8.1
(a) Explain the terms scalar quantity and vector quantity.

(b) On Fig. 8.1, mark [2]
(i) the direction of the force acting on the bob when it is swinging. [2]
(ii) the direction the bob would travel if the string breaks at point P.

Chapter 2 Forces and Motion 17

(c) State what will happen to the force if [3]
(i) the length of the string is increased. [Total: 7]
(ii) the mass of the bob is increased.
(iii) the speed is increased. [1]

Clone May / June 2020

9. Fig. 9.1 shows the extension-load graph of a spring.

Extension / cm

10
5
00 2 4 6 8 10 Load / N

Fig. 9.1
(a) State the range of the loads for which the spring obeys Hooke’s law.

(b) By using the graph, determine the spring constant of the spring.
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spring constant: [2]

(c) A second identical spring is connected in series as shown in Fig. 9.2. A load of 6.0 N is
suspended at the bottom. The arrangement is in equilibrium.

Load

Fig. 9.2

18 CAcaemYboruidr gPehIyGsiCcsSETM

(i) State the type of energy stored in the spring. [1]
(ii) Determine the extension of the springs in the arrangement in Fig. 9.2.

extension: [1]
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(iii) The load is increased to 8.0 N. Calculate the distance moved by the load when the
load is changed from 6 N to 8 N.

distance moved: [2]
[Total: 7]

Clone Oct / Nov 2020

10. (a) A student wants to investigate the motion of a trolley travelling down a ramp. Fig. 10.1
shows the experiment set-up.

Tape

Trolley

Ramp
P

Fig. 10.1
The trolley is attached with a ticker-tape machine which makes a dot on the tape every
0.02 s. Fig. 10.2 shows a section of the tape.

Fig. 10.2
(i) By referring to the tape, name the type of motion of the trolley and explain.

[2]
Chapter 2 Forces and Motion 19

(ii) When the trolley reaches point P, the ramp is tilted so that the angle between it and
the table is greater. Describe and explain the change in the motion of the trolley.

[1]
(b) Another trolley was released from the top of the ramp. Fig. 10.3 shows the speed-time

graph for this trolley.

Speed, m/s

1.5

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0.5

0 Time, s
0 1.0 2.0 3.0

Fig. 10.3
Calculate the distance travelled by the trolley.

distance: [2]
(c) Fig. 10.4 shows the set-up of a terminal velocity experiment.

Metal ball

X Liquid
Tube

Fig. 10.4
The ball is released from rest and reaches terminal velocity at point X. Explain the motion
of the ball along the path. Use ideas of force and acceleration in your answer.

[3]
[Total: 8]

20 CAcaemYboruidr gPehIyGsiCcsSETM

Answers

1 Measurements and Units total time taken = 135.19 – 0.07 (zero error)
= 135.12 seconds
135.12 second
Part 1: Multiple-choice Questions average time = 3
1. D
= 45.04 seconds
Table of SI units
1 0. C
quantity SI unit unit symbol Mass is a scalar quantity.
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time second K 1 1. B
m A scalar quantity is a quantity which has magnitude only.
temperature kelvin kg
A vector quantity is a quantity which has both direction
length metre and magnitude.

mass kilogram 1 2. A
The object will sink in the liquid with a lower density
2. C
area = length × width than the object’s density.
= (6.1 – 0.5) cm × (12.5 – 8.9) cm
= 20.16 cm2 1 3. D
2000 kg/m3 = 2 g/cm3
3. B density = mass/volume
A manometer is used for measuring pressure. mass = density × volume
The sensitivity of a ruler is 0.1 cm. = 2 g/cm3 × 10 cm3
The sensitivity of a vernier callipers is 0.01 cm. = 20.00 g
The sensitivity of a mircometer screw gauge is 0.01 mm.
The dimension is in cm, so the most suitable instrument 1 4. A mass
volume
to measure it is a ruler. density =

4. D density A = 90 g
The sensitivity of a measuring tape and metre rule is 64 cm3

0.1 cm. = 1.4062 g/cm3
A spring balance is used to measure force. 35 g
The sensitivity of a mircometer screw gauge is 0.01 mm. density B = 27 cm3

5. A = 1.2963 g/cm3
When using a measuring cylinder, the reading must be 150 g
density C = 50 cm3
taken from the bottom of the meniscus.

6. B = 3 g/cm3
Firstly, when using a measuring cylinder, the reading If the object’s density is less than the liquid, it will float.
If the object’s density is more than the liquid, it will sink.
must be taken from the bottom of the meniscus.
Secondly, it must be read perpendicularly at eye level to 1 5. B
avoid a parallax error. The period is affected only by the length of the

7. A pendulum.
When using a measuring cylinder, the reading must be
Part 2: Structured Questions
taken from the bottom of the meniscus. If the largest
measuring cylinder is used, the sensitivity would be too 1. (a) A vector quantity is a quantity with direction
low to get an accurate result. and magnitude. [1]

8. A A scalar quantity is a quantity with magnitude
The calculation is only for the time taken for the second only. [1]
(b) Velocity, displacement, force [3]
lap. To perform the calculation, the time must be in the Speed, energy and power are scalar quantities.
same unit. 2. (a) Mircometer screw gauge [1]
1:49:06 = 109.06 seconds The sensitivity of a mircrometer screw gauge is up
55:01 = 55.01 seconds to 0.01 mm.
109.06 – 55.01 = 54.05 seconds

9. C (b) Measure the total thickness of 100 sheets of
2:15:19 = 135.19 seconds paper. [1]

110 Cambridge IGCSETM
Ace Your Physics

11 The Earth in Space Part 2: Structured Questions

1. (a) Any 4:
a formation of a large cloud of dust and gas,
Part 1: Multiple-choice Questions called a nebula [1]

1. A the nebula slowly collapses inwards, rotating
A comet orbits the Sun in an elliptical orbit. Our galaxy, faster due to gravity [1]
the gravitational potential energy is converted
the Milky Way, includes the Sun. Artificial satellites and to thermal energy [1]
the Moon orbit the Earth.

2. A 2πr a protostar becomes the Sun [1]
total time
orbital speed = the Sun’s gravitational pull pulls the planets into
orbits around it [1]
2π × 3.8 × 105 (b) Mercury [1]
= 27.3 × 24 (c) Neptune [1]

= 3644.09 km/h 2. (a) Any 4:

3. C
Penerbitan Pelangi Sdn Bhd. All Rights Reserved2πr a formation of a large cloud of dust and gas,
total time called a nebula [1]
orbital speed = the nebula slowly collapses inwards, rotating

= 2π × (3500 + 100) faster due to gravity [1]
3.25
= 6959.8 km/h the gravitational potential energy is converted
to thermal energy [1]
4. C the temperature and pressure is high enough to
According to Edwin Hubble, the universe is expanding. trigger nuclear fusion [1]
a protostar becomes a star [1]
When an object is moving away from the Earth, its (b) Any 4:
wavelength is shifted towards the red end of the visible the star runs out of hydrogen [1]
spectrum. This is due to the Doppler effect. Redshift the inward force due to gravity is larger than
can be used to calculate the speed at which a galaxy is the outward force due to pressure [1]
moving away from the Earth.

5. C it will form a supernova [1]

6. C at the centre of the gigantic explosion, a neutron
The Sun will become a red giant, then a white dwarf. star will form [1]
7. D for the explosions of massive stars, the core
Sun – Mercury – Venus – Earth – Mars – Asteroids – cannot resist the pull of gravity and collapses,
and a black hole is formed [1]
Jupiter – Saturn – Uranus – Neptune

8. D 3. (a) Mercury, Venus, Earth, Mars [2]
A black hole is formed when a massive star explodes in a [1 mark for two correct answers]
(b) Jupiter, Saturn, Uranus, Neptune [2]
supernova and the core of the star cannot resist the pull [1 mark for two correct answers]
of gravity and collapses inwards upon itself. Nothing can (c) inner planets are small, rocky and dense
escape from a black hole, not even light.

9. D planets, while the outer planets are large balls
the Milky Way galaxy > the Solar System > nebula > Sun of gas [1]

10. A inner planets are closer to Sun, outer planets

11. D are further away from the Sun [1]
4. (a) the spectral lines from distant galaxies move
12. A closer to the red end of the light spectrum [1]
According to the Big Bang Theory, space itself only (b) this due to the Doppler effect [1]
the redshift in the light from distant galaxies
started to expand after the Big Bang.

1 3. D show that they are moving away from the Earth

1 4. D and the universe is expanding [1]
4.5 × 9.5 × 1012 km (c) age of the universe = 1
= 4.275 × 1013 km H0
= 4.275 × 1016 m 2.3 1
× 10−18
1 5. B 1 = [1]
H0
age of the universe = = 4.35 × 1017 seconds [1]

= 1 = 1.38 × 1010 years [1]
× 10−18 5. (a) centripetal force [1]
2.3 2πr
= 4.35 × 1017 seconds total time
= 1.38 × 1010 years (b) orbital speed =

Answers 135

= 2π × (6400 + 1454) [3] (b) the spectral lines from distant galaxies move
1.6667 closer to the red end of the light spectrum [1]
this is due to the Doppler effect [1]
= 2.96 × 104 km/h [1] 8. (a) Moon [1]
correct radius [1]
correct hour [1] (b) Any 2:
communication satellites – transmitting radio
6. (a) nuclear fusion [1] or TV signals [2]
(b) 411H → 42He + 2+10e + energy
correct components [1] navigation satellites – GPS system [2]
monitoring satellites – weather forecast [2]
correct helium 42He [1] astronomical satellites – for observing distant
correct equation [1] stars and galaxies [2]
(c) total distance = 6.5 × 9.5 × 1012 km
= 6.175 × 1013 km [1] 2πr
distance (c) orbital speed = time
time
speed = time = orbit2aπl srpeed

Penerbitan Pelangi Sdn Bhd. All Rights Reservedtime =distance = 2π × (6400 + 1100) [2]
speed 1650
6.175 × 1013 km
= 3× 108 m/s [1] = 28.56 hours [1]

= 2.06 × 108 seconds [1] =1 day 4.56 hours [1]

= 57 175 hours 55 minutes [1]
7. (a) The Big Bang Theory—light from distant
galaxies is redshifted as the galaxies move
further away from Earth. [1]
CMBR—a type of electromagnetic radiation
which is a remnant from the formation of
the universe which has expanded into the
microwave region of the electromagnetic
spectrum as the universe expanded [1]

136 Cambridge IGCSETM
Ace Your Physics

Cambridge IGCSETM DA1304

ACE YOUR Cambridge IGCSETM ACE YOUR PHYSICS

PHYSICS

Workbook

Cambridge IGCSETM Ace Your Physics is designed to aid students build
the skills required to succeed in the IGCSE Physics Examination. By working
through the questions in the book, students are well equipped with valuable
techniques in answering the examination questions.

This workbook is written distinctively based on the Cambridge IGCSE Physics
2020–2022 and 2023–2025 syllabuses for (0625) course. The scope, sequence
and level of the workbook has been constructed to match the Cambridge IGCSE
Year 10 and Year 11 syllabuses.

A wealth of questions in the book sets a benchmark to prepare students for the
examination-based questions at Extended Level, which include both multiple-
choice and structured questions. In addition, this workbook provides detailed
explanation to all the questions in its answer key. Upon completing the ample
questions in this book, students are on their path in developing the fundamental
scientific skills for progression to Cambridge International AS and A Level,
further education, or science-related professions.

About the Author
Chia Soon Chai was a graduate with Bachelor’s in Electrical and Electronic Engineering from Universiti

Putra Malaysia. During his university years, he worked as a tutor and laboratory assistant guiding
undergraduates to complete their tutorials and experimental assignments. He is pursuing his PhD in
Electrical Power Engineering currently.

He has been teaching IGCSE Physics, Mathematics and Additional Mathematics for over 7 years. He also
conducted intensive Physics classes to support students who were striving hard and needed assistance
before examination. For now, he is guiding students in IGCSE and International Advanced Level for
Physics.
Penerbitan Pelangi Sdn Bhd. All Rights Reserved

www.dickenspublishing.co.uk DA1304
ISBN: 978-1-78187-262-8
Suite G7-G8, Davina House, 137-149 Goswell Road,
London, EC1V 7ET, United Kingdom.
E-mail: [email protected]