Candidate Name:
IGCSE Sample Examination Paper
PHYSICS PAPER 3 Extended
1 hour 15 minutes
Answer questions on the Question Paper.
Answer all questions.
The questions in this sample were taken from Cambridge IGCSE Physics 0625 Paper 3
1 Q1 June 2006
2 Q3 June 2007
3 Q2 November 2005
4 Q4 June 2007
5 Q5 November 2007
6 Q6 June 2007
7 Q7 June 2005
8 Q8 November 2007
9 Q11 June 2005
10 Q10 November 2007
11 Q11 June 2006
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2
1 A bus travels from one bus stop to the next. The journey has three distinct parts. Stated in order
they are
uniform acceleration from rest for 8.0 s,
uniform speed for 12 s,
non-uniform deceleration for 5.0 s.
Fig. 1.1 shows only the deceleration of the bus.
Fig. 1.1
a On Fig. 1.1, complete the graph to show the first two parts of the journey. [3]
b Calculate the acceleration of the bus 4.0 s after leaving the first bus stop.
acceleration 5
[2]
c Use the graph to estimate the distance the bus travels between 20 s and 25 s.
estimated distance 5
[2]
d On leaving the second bus stop, the uniform acceleration of the bus is 1.2 m/s . The mass of the
bus and passengers is 4000 kg.
2
Calculate the accelerating force that acts on the bus.
force 5
[2]
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e The acceleration of the bus from the second bus stop is less than that from the first bus stop.
Suggest two reasons for this.
1
2
[2]
[Total 11]
2 A student wishes to work out how much power she uses to lift her body when climbing a flight
of stairs.
Her body mass is 60 kg and the vertical height of the stairs is 3.0 m. She takes 12 s to walk up the
stairs.
a Calculate
i
the work done in raising her body mass as she climbs the stairs,
work 5
[2]
ii the output power she develops when raising her body mass.
power 5
[2]
b At the top of the stairs she has gravitational potential energy.
Describe the energy transformations taking place as she walks back down the stairs and stops at
the bottom.
[2]
[Total: 6]
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4
3 Fig. 3.1 shows apparatus for investigating moments of forces.
Fig. 3.1
The uniform metre rule shown in Fig. 3.1 is in equilibrium.
a Write down two conditions for the metre rule to be in equilibrium.
condition 1 condition 2 [2]
b Show that the value of the reading on the spring balance is 8.0 N. [2]
c The weight of the uniform metre rule is 1.5 N.
Calculate the force exerted by the pivot on the metre rule.
magnitude of force 5
direction of force
[2]
[Total: 6]
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4 Fig. 4.1 shows a student’s attempt to estimate the specific latent heat of fusion of ice by adding ice at
0 8C to water at 20 8C. The water is stirred continuously as ice is slowly added until the temperature
of the water is 0 8C and all the added ice has melted.
Fig. 4.1
a Three mass readings are taken. A description of the first reading is given.
Write down descriptions of the other two.
reading 1 the mass of the beaker 1 stirrer 1 thermometer
reading 2
reading 3
[2]
b Write down word equations which the student could use to find
i
the heat lost by the water as it cools from 20 8C to 0 8C,
[1]
ii the heat gained by the melting ice.
[1]
c The student calculates that the water loses 12 800 J and that the mass of ice melted is 30 g.
Calculate a value for the specific latent heat of fusion of ice.
specific latent heat of fusion 5
[2]
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d Suggest two reasons why this value is only an approximate value.
Reason 1 Reason 2
[2]
[Total: 8]
5 Fig. 5.1 shows some apparatus which is to be used to compare the emission of infra-red radiation
from four differently painted surfaces.
Fig. 5.1
Near the centre of each side is an infra-red detector. The four detectors are identical.
A supply of very hot water is available.
a Describe how you would use this apparatus to compare the infra-red radiation from the
four surfaces.
[3]
b Suggest which surface will be the best emitter and which will be the worst emitter.
best emitter
worst emitter
[1]
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c The infra-red detectors are made from thermocouples soldered to blackened metal plates.
These are connected to galvanometers.
In the space below, draw a labelled diagram of a thermocouple. [2]
[Total: 6]
6 Fig. 6.1 shows a rectangular glass block ABCD.
Fig. 6.1
a The ray FE is partly reflected and partly refracted at E.
i
On Fig. 6.1, draw in the approximate path of the refracted ray, within and beyond the block.
Label the ray refracted ray. [1]
ii On Fig. 6.1, draw in the path of the reflected ray. Label the ray reflected ray. [1]
b A second ray, almost parallel to AE, strikes the block at E and is partly refracted at an angle of
refraction of 438.
i
State an approximate value for the angle of incidence at E.
[1]
ii State an approximate value for the critical angle for the light in the glass block.
[1]
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iii Calculate an approximate value for the refractive index of the glass of the block.
refractive index 5
[2]
c The speed of the light along ray FE is 3.0 3 108 m/s. Calculate the speed of the refracted light in
the glass block.
speed 5
[2]
[Total: 8]
7 Fig. 7.1 shows the parts of the electromagnetic spectrum.
Fig. 7.1
a Name one type of radiation that has
i
a higher frequency than ultra-violet,
[1]
ii a longer wavelength than visible light.
[1]
b Some g-rays emitted from a radioactive source have a speed in air of 3.0 3 108 m/s and a
wavelength of 1.0 3 10212 m.
Calculate the frequency of the g-rays.
frequency 5
[2]
c State the approximate speed of infra-red waves in air.
[1]
[Total: 5]
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8 Fig. 8.1 shows two electrical circuits.
Fig. 8.1
The batteries in circuit 1 and circuit 2 are identical.
a Put ticks in the table below to describe the connections of the two resistors P and Q.
series
parallel
circuit 1
circuit 2
[1]
b The resistors P and Q are used as small electrical heaters.
State two advantages of connecting them as shown in circuit 2.
advantage 1 advantage 2 [2]
c In circuit 1, the ammeter reads 1.2 A when the switch is closed.
Calculate the reading of the voltmeter in this circuit.
voltmeter reading 5
[2]
d The two switches in circuit 2 are closed. Calculate the combined resistance of the two resistors
in this circuit.
combined resistance 5
[2]
e When the switches are closed in circuit 2, ammeter 1 reads 5 A and ammeter 2 reads 2 A.
Calculate
i
the current in resistor P,
current 5
[1]
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ii the power supplied to resistor Q,
power 5
[1]
iii the energy transformed in resistor Q in 300 s.
energy 5 ................................................ [1]
[Total: 10]
9 Fig.9.1 shows a flexible wire hanging between two magnetic poles. The flexible wire is connected to
a 12 V d.c. supply that is switched off.
Fig. 9.1
a Explain why the wire moves when the supply is switched on.
[2]
b State the direction of the deflection of the wire.
[2]
c When the wire first moves, energy is changed from one form to another. State these two forms
of energy.
from
to
[1]
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d Fig.9.2 shows the flexible wire made into a rigid rectangular coil and mounted on an axle.
i
Fig. 9.2
Add to the diagram an arrangement that will allow current to be fed into the coil whilst
allowing the coil to turn continuously. Label the parts you have added. [1]
ii Briefly explain how your arrangement works.
[2]
[Total: 8]
10 Fig. 10.1 shows an AND gate with two inputs A and B and one output.
Fig. 10.1
a State the output when
i
A is high and B is low,
[1]
ii both A and B are low.
[1]
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12
b An electrical thermometer in a greenhouse gives a low output if the temperature is too low.
A humidity sensor in the same greenhouse gives a high output if the humidity in the greenhouse
is too high.
An alarm sounds when both the temperature is too low and the humidity is too high.
i
Complete the diagram below to show how a NOT gate and an AND gate may be used to
provide the required output to the alarm. [2]
ii On your diagram, use either ‘high’ or ‘low’ to indicate the level of the inputs and outputs of
both gates when the alarm sounds. [2]
[Total: 6]
11 Fig. 11.1 shows a beam of radiation that contains a-particles, b-particles and g-rays. The beam
enters a very strong magnetic field shown in symbol form by N and S poles.
Fig. 11.1
Complete the table below.
radiation
direction of
deflection, if any
charge carried by
radiation, if any
a-particles
b-particles
g-rays
[6]
[Total: 6]
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