year 10 physics time: 2 hours...physics – year 10 – track 2 – 2017 page 3 of 12 2. steve is...

Physics – Year 10 – Track 2 – 2017 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

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

http://en.wikipedia.org/wiki/Dolphins


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


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


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


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


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]


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


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


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


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]

year 10 physics time: 2 hours...physics – year 10 – track 2 – 2017 page 3 of 12 2. steve is...

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