year 10 physics time: 2 hours...physics – year 10 – track 2 – 2017 page 3 of 12 2. steve is...
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Physics – Year 10 – Track 2 – 2017 Page 1 of 12
DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION
Department of Curriculum Management
Educational Assessment Unit
Annual Examinations 2017
YEAR 10 PHYSICS TIME: 2 hours
Name: ________________________________ Class: _________________
INFORMATION FOR CANDIDATES
• Where necessary take acceleration due to gravity ‘g’ to be 10 m/s2.
• The use of a calculator is allowed.
• The number of marks for each question is given in brackets at the end of each question.
• You may find these equations useful.
Force F = m a W = m g
Motion Average Speed =
total distance
total time s =
(u + v) t
2 s = ut +
1
2at2
v = u + at v2 = u2 + 2as Momentum = m v
Electricity
Q = I t V = I R E = Q V
R ∝ 𝐿/𝐴 E = I V t
RTOTAL = R1 + R2 + R3 1
RTOTAL=
1
R1+
1
R2
Waves
η =real depth
apparent depth η =
speed of light in air
speed of light in medium
v = f λ
f =1
T
magnification =hi
ho=
image height
object height
Others Area of triangle =1
2bh Area of Trapezium =
1
2(a + b)h
INSTRUCTIONS TO CANDIDATES
• Use blue or black ink. Pencil should be used for
diagrams only.
• Read each question carefully and make sure that
you know what you have to do before starting your
answer.
• Answer ALL questions.
• All working must be shown.
For Examiner’s Use Only
Question Max Mark
1 8
2 8
3 8
4 8
5 8
6 15
7 15
8 15
Written 85
Practical 15
Total 100
This document consists of 12 printed pages.
Track 2
Page 2 of 12 Physics – Year 10 – Track 2 – 2017
SECTION A
Each question carries 8 marks. This section carries 40 marks of the total marks for this paper.
1. Orcas and dolphins can hear and produce very high frequency
sounds. They use such sounds in their navigational system to
orient and capture prey. Orcas produce a wide variety of clicks,
whistles and pulsed calls. These vary in frequency from 1 kHz
to 25 kHz.
a) 25 kHz sounds are inaudible. What are these high frequency sounds called?
___________________________________________________________________________[1]
b) In the space provided, draw a sound wave and mark one wavelength.
[2]
c) A dolphin sends a sound signal and receives an echo from a shoal of fish in 1.5 seconds. If
the speed of sound in seawater is 1550 m/s, calculate the distance travelled by these waves.
_____________________________________________________________________________
___________________________________________________________________________[2]
d) Calculate the distance from the dolphin to the shoal of fish.
_____________________________________________________________________________
___________________________________________________________________________[1]
e) The wavelength of the sound waves is 0.07 m, calculate the frequency of the sounds emitted
by these dolphins.
_____________________________________________________________________________
___________________________________________________________________________[2]
Figure 1
Physics – Year 10 – Track 2 – 2017 Page 3 of 12
2. Steve is playing a football match. A glass window of a nearby building reflects sunlight into his
eyes.
Figure 2
a) On the diagram of Figure 2, draw rays of light to show how light rays from the sun get
reflected by the glass window into his eyes. [2]
b) Light is part of the electromagnetic spectrum. Name the part of the electromagnetic spectrum
which is responsible for:
i) skin tanning __________________________________________________________ [1]
ii) use in TV remote control_________________________________________________[1]
iii) treatment of cancer patients ______________________________________________ [1]
iv) cooking food __________________________________________________________[1]
c) Name TWO common properties of electromagnetic waves.
_____________________________________________________________________________
___________________________________________________________________________[2]
3. A charged polythene strip is held close to a suspended strip
labelled A.
a) What is the type of charge on the polythene strip?
_____________________________________________ [1]
b) Strip A moves away when the polythene strip B is
brought close to it. Give a reason.
_____________________________________________________________________________
___________________________________________________________________________[2]
polythene
A
B
string
Page 4 of 12 Physics – Year 10 – Track 2 – 2017
c) Use ideas about movement of charge to explain how a polythene strip acquires a charge when
rubbed with a cloth.
_____________________________________________________________________________
___________________________________________________________________________[1]
d) A certain type of rechargeable battery is capable of delivering a current of 0.2 A for 4000 s,
before it needs to be recharged. Calculate:
i) the total charge the battery can deliver before it needs to be recharged;
________________________________________________________________________[2]
ii) the maximum time it could be used without being recharged, if the current through it were
0.5 A.
________________________________________________________________________[2]
4. A number of students have
designed and built an electric-
powered go-Kart. Figure 3 shows
how the velocity of the go-kart
changes during a 40 second test
race.
a) Along which part of the graph
is the go-Kart’s acceleration
greatest?
________________________ [1]
b) What is the value of the
maximum velocity of the
go-Kart?
________________________ [1]
c) Use the graph or otherwise, to calculate the acceleration of the go-kart between
Points K and L.
_____________________________________________________________________________
_____________________________________________________________________________
___________________________________________________________________________[2]
J
K
L
M
Figure 3
Physics – Year 10 – Track 2 – 2017 Page 5 of 12
d) Use the graph or otherwise, to calculate the distance covered by the go-Kart during its
deceleration.
_____________________________________________________________________________
___________________________________________________________________________[2]
e) Calculate the total distance covered by the go-Kart if the average speed is 6.5 m/s.
_____________________________________________________________________________
___________________________________________________________________________[2]
5. A camera was used to take photographs of a toy yacht. The camera contains
a converging lens.
a) Complete the ray diagram to show how the converging lens produces
an image of the object O.
[2]
b) If each square represents 5 cm, the height of the image is ____________ cm. [1]
c) State TWO properties of the image formed.
___________________________________________________________________________[2]
d) Determine the magnification of the lens.
_____________________________________________________________________________
___________________________________________________________________________[2]
e) State ONE property of the image that would be produced if the object is placed between the
lens and the principal focus.
___________________________________________________________________________[1]
F F
O
Figure 4
Page 6 of 12 Physics – Year 10 – Track 2 – 2017
SECTION B
Each question carries 15 marks. This section carries 45 marks of the total marks for this paper.
6. Angelo and Doreen set up a single
water wave by pushing the water
once with a piece of wood. They
want to investigate how its velocity
depends on the depth of water.
a) Name the apparatus required to:
i) measure the distance AB
covered by the single
wave:_______________________________________ [1]
ii) find the time taken for the wave to travel distance AB: _________________________[1]
b) By referring to the diagram:
i) find the distance covered by the water wave as it travels along AB________________ [1]
ii) calculate the depth of 𝑑 of the water in the tank ______________________________ [1]
c) It takes 1.6 seconds for the water wave to travel from A to B. Calculate the velocity of the
water wave.
___________________________________________________________________________[2]
d) Tick ONE correct precaution that is needed to ensure that the readings obtained are
reliable.
the tank must be a plastic one
the water in the tank must be boiled before the experiment
the tank containing water must be placed on a flat levelled surface
the flat piece of wood used to set up a single wave in the tank must be very thin
[1]
1 m
2 m A B
piece of wood plastic tank
water
0.75 m
𝑑
Figure 5
Physics – Year 10 – Track 2 – 2017 Page 7 of 12
e) Doreen suggests that the deeper the water level the greater is the water wave velocity. She
investigates this statement by measuring the velocity while varying the depth.
Depth / m 0.0 0.05 0.10 0.15 0.20 0.25 0.30
Velocity / m/s 0.0 0.70 0.90 1.00 1.10 1.10 1.10
i) Plot a graph of Velocity in m/s on the y-axis against Depth of water in m on the x-axis.
Draw the best curve through the points. [5]
ii) Use your graph to find the approximate velocity of the water wave when the depth of the
water in the tank is 0.45 m. _____ m/s [1]
f) Doreen now placed a barrier in front of the waves. Complete the diagram in Figure 6 to show
how the water waves behave when passing through this barrier.
Figure 6
[2]
Page 8 of 12 Physics – Year 10 – Track 2 – 2017
Physics – Year 10 – Track 2 – 2017 Page 9 of 12
7.
a) Two resistors R1 and R2 are connected in parallel
as shown in the circuit diagram of Figure 7.
i) Mark on the diagram the positive (+) and the
negative terminal (-) of the battery. [2]
ii) The voltage across R1 is ___________ V. [1]
iii) The voltage across R2 is ___________ V. [1]
b) Calculate the:
i) total resistance of the circuit in ohms (Ω);
__________________________________________________________________________
________________________________________________________________________ [2]
ii) the total current in amperes, (A), flowing through the circuit;
__________________________________________________________________________
________________________________________________________________________ [2]
iii) the total charge in coulombs, (C), flowing through the circuit given that the circuit is turned
on for 60 seconds.
__________________________________________________________________________
________________________________________________________________________ [2]
Figure 7
R2 = 6
R1 = 3
12 V
Page 10 of 12 Physics – Year 10 – Track 2 – 2017
c) Steve and Lucy investigate how the resistance of a resistor and a thermistor changes with
temperature. They presented their data in the form of a graph, as shown in Figure 8.
Figure 8
i) The table below shows the symbols of three electronic components.
State which of the symbols below represents a thermistor. _______________ [1]
ii) Use the graph to underline the correct word within brackets in the following statements:
The resistance of the thermistor (increases / decreases) as its temperature increases.
The resistance of the resistor (increases / decreases) as its temperature increases.
[2]
iii) Use the graph to find the:
temperature at which both the thermistor and the resistor have the same resistance,
________°C [1]
resistance of the thermistor and the resistor at this temperature. _____ Ω [1]
K L M
Physics – Year 10 – Track 2 – 2017 Page 11 of 12
8. Sean is travelling on his bicycle along a level
road when he brakes and stops suddenly to
avoid a dog which crosses his path. Sean finds
himself thrown forwards from his bike.
a) Arrows X and Y represent two forces
acting on Sean while travelling on his
bicycle. Name the two forces X and Y.
Force X is the ___________________ [1]
Force Y is the ___________________ [1]
b) Tick ONE correct statement.
Sean is thrown forwards because he is carrying a load on his back.
Sean is thrown forwards because when he brakes, the bicycle comes to a stop while
he continues to travel forwards due to his inertia.
Sean is thrown forwards because when he brakes, he comes to a stop while the bicycle
continues to travel forwards due to its inertia.
[1]
c) Use some of the words in the grid below to complete the statement about Newton’s first law
of motion.
moving big force external rest internal constant
An object at _______________ remains at rest, while a _____________ object continues to
move at _______________ velocity unless an _________________ resultant
_______________ acts on it. [5]
X
Y
Figure 9
Page 12 of 12 Physics – Year 10 – Track 2 – 2017
d) Sean is cycling at 5 m/s. The bicycle has a mass of 10 kg and his mass is 60 kg. Calculate:
i) the total mass in kg of Sean and his bicycle;
________________________________________________________________________ [1]
ii) the total initial momentum of Sean and his bicycle.
__________________________________________________________________________
________________________________________________________________________ [2]
e) Assuming that Sean’s bicycle stops as soon as Sean applies the brakes, find:
i) the total final momentum _____________ kg m/s; [1]
ii) Sean’s momentum while being thrown forwards from his bicycle ____________ kg m/s;
[1]
iii) the velocity with which Sean is thrown forwards.
__________________________________________________________________________
________________________________________________________________________ [2]