YEAR 10 PHYSICS TIME: 2hours

[Pages:10]DEPARTMENT FOR CURRICULUM, RESEARCH, INNOVATION AND LIFELONG LEARNING Directorate for Learning and Assessment Programmes Educational Assessment Unit

Annual Examinations for Secondary Schools 2018

YEAR 10

PHYSICS

Track 2

TIME: 2hours

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=ma

W = mg

Motion

Average

Speed

=

total distance total time

v = u + at

(u + v) t s= 2 v2 = u2 + 2as

s

=

ut

+

1 2

at2

Momentum = m v

Q = It

V = IR

E = QV

Electricity Waves Others

R /

RTOTAL = R1 + R2 + R3

real depth = apparent depth v = f

1 f=T

1 Area of triangle = 2 bh

E =IVt

1

11

RTOTAL = R1 + R2

speed of light in air = speed of light in medium

magnification

=

hi ho

=

image object

height height

1 Area of Trapezium = 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

This document consists of 10 printed pages.

Total

100

Physics ? Year 10 ? Track 2 ? 2018

Page 1 of 10

SECTION A Each question carries 8 marks. This section carries 40 marks of the total marks for this paper.

1. A vibrating tuning fork is placed close to a microphone as shown in Figure 1.

microphone tuning fork

oscilloscope

a) Are sound waves transverse or longitudinal?

Figure 1

_______________________________________________________________________ [1]

b) Explain, in terms of movement of air particles, how sound reaches the microphone. _______________________________________________________________________ [1]

c) The speed of sound in air is 340 m/s. Given that the wavelength of the waves is 170 cm, calculate the frequency of the sound produced. __________________________________________________________________________ _______________________________________________________________________ [2]

d) Calculate the periodic time of the sound waves. _______________________________________________________________________ [1]

e) Explain why the sound produced can be heard by humans. __________________________________________________________________________ _______________________________________________________________________ [1]

f) The waveform produced by the vibrating tuning fork is shown in Figure 2.

Figure 2

Figure 3

Figure 4

i) On Figure 3, draw the waveform produced by the same tuning fork vibrating

with half the amplitude of the tuning fork in Figure 2.

[1]

ii) On Figure 4, draw the waveform produced by a different tuning fork vibrating

at half the frequency but with the same amplitude as in Figure 2.

[1]

Page 2 of 10

Physics ? Year 10 ? Track 2 ? 2018

2. Shania builds a model of a balloon propelled cart as shown in Figure 5. She attaches a balloon to the cart and inflates it. The cart and the balloon are initially at rest. The balloon is released and the cart moves rapidly to the right with a speed of 1.4 m/s. The total mass of the cart and the balloon is 200 g.

balloon

air rushing out

movement cart

Figure 5

a) What is the total momentum before the balloon is released? __________________________________________________________________________ [2]

b) What is the total momentum after the balloon is released? Explain. _____________________________________________________________________________ __________________________________________________________________________ [2]

c) Calculate the momentum of the cart as it travels at 1.4 m/s. _____________________________________________________________________________ __________________________________________________________________________ [1]

d) Given that the air flows out of the balloon with a speed of 24 m/s, calculate the initial mass of air present inside the balloon. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ __________________________________________________________________________ [2]

e) Newton's 3rd law can be used to explain how this model works. State this law. _____________________________________________________________________________ __________________________________________________________________________ [1]

Physics ? Year 10 ? Track 2 ? 2018

Page 3 of 10

3. The circuit in Figure 6 consists of a cell, three identical filament lamps A, B and C and four switches S1, S2, S3 and S4.

S1 A

S2 B

S4

C

S3 Figure 6

a) State which switches need to be closed so that: i) only A and C light up;

____________________________________________________________________ [1] ii) only A and B light up;

____________________________________________________________________ [1] iii) all the three filament lamps light up.

____________________________________________________________________ [1]

b) Kelly connects a constantan wire XY in the circuit shown in Figure 7. When she closes the switch, she notices that current flows through the circuit.

constantan wire

A ammeter

X

Y

Figure 7

State what will be observed on the ammeter if: i) she replaces wire XY with a solid plastic cable;

____________________________________________________________________ [1] ii) she replaces wire XY with the same type of wire having double the length;

____________________________________________________________________ [1] iii) she connects an identical constantan wire in parallel with wire XY.

____________________________________________________________________ [1] c) Kelly tests whether the constantan wire in Figure 7 is an ohmic conductor. Name

TWO other components she requires to carry out this experiment.

_______________________________________________________________________ [2]

Page 4 of 10

Physics ? Year 10 ? Track 2 ? 2018

4. A parallel beam of light is incident on two different lenses as shown in Figure 8.

A

B

Figure 8

a) Fill in: Lens A is called a _____________________ lens, while lens B is called a

_____________________ lens.

[2]

b) Draw the path taken by the beam of light as it travels through each lens. [2]

c) One of the lenses in Figure 8 is used to find its approximate focal length using a distant object as shown in Figure 9. Which of the two lenses can be used for this experiment? _______________________________________________________________________ [1]

distant object

lens

image

Figure 9

d) Explain briefly how this experiment is carried out. State clearly which distance is approximately equal to the focal length of the lens. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ _______________________________________________________________________ [2]

e) The image in Figure 9 is inverted. State ONE other property of the image formed. _______________________________________________________________________ [1]

Physics ? Year 10 ? Track 2 ? 2018

Page 5 of 10

5. Pam walks from her home to the supermarket and it takes her 16 minutes to arrive. Her journey is shown in the distance-time graph in Figure 10.

Distance (m)

1000

900

C

800

700

600

500

A

B

400

300

200

100

0

0

2

4

6

8

10

12

14

16

18

Time (minutes)

Figure 10

a) How far is the supermarket from her home? _____________________________ [1]

b) Calculate the average speed (in m/s) during the first 6 minutes.

_________________________________________________________________________

______________________________________________________________________ [3] c) State the type of motion present along AB.

______________________________________________________________________ [1] d) Along which section of the graph is she walking fastest? Explain.

_________________________________________________________________________

______________________________________________________________________ [2]

e) On another day, Pam runs the same distance at constant speed in 8 minutes.

Draw the resulting graph on Figure 10.

[1]

Page 6 of 10

Physics ? Year 10 ? Track 2 ? 2018

SECTION B Each question carries 15 marks. This section carries 45 marks of the total marks for this paper.

6. a) A current of 3 A flows through a filament lamp for 300 seconds. i) Calculate the total charge.

___________________________________________________________________ [2]

ii) Calculate the energy used if the voltage across the lamp is 6 V.

____________________________________________________________________ [2]

b) A circuit is set up as shown in Figure 11. 6 V

A X

R R

1.8 V

V

Figure 11

Underline the correct answer.

i) Ammeters should always be connected in (parallel, series) and voltmeters

must be connected in (parallel, series).

[2]

ii) Component `X' and resistor R are connected in (parallel, series) thus they

have the same (current, voltage) but the (current, voltage) is divided. [3]

iii) Name the component marked `X': ___________________________________ [1] iv) Given that the total voltage of the circuit is 6 V and the voltmeter across `X'

reads 1.8 V, what is the reading on voltmeter V?

___________________________________________________________________ [1]

v) Hence, calculate the current I flowing through the circuit given that R has a resistance of 50 . ___________________________________________________________________ [2]

vi) Calculate the resistance of component `X'. ___________________________________________________________________ [2]

Physics ? Year 10 ? Track 2 ? 2018

Page 7 of 10

7. a) A bird observes a fish swimming at a certain depth as shown in Figure 12.

X Y

Figure 12

i) On Figure 12 label:

the normal;

the incident ray;

the angle of refraction, r.

[3]

ii) Draw the direction of travel of the light rays.

[1]

iii) Label with an `I' the position of the image of the fish.

[1]

iv) Fill in: X is known as the ________________ ________________ and

Y is known as the ________________ ________________.

[2]

b) The table below shows how the apparent depth changes with the real depth.

Apparent depth (m) 0.5 1.0 1.5 2.0 2.5 3.0 3.5

Real depth (m)

0.7 1.4 2.1 2.8 3.5 4.2 4.9

i) Plot a graph of real depth (m) on the y-axis against apparent depth (m) on

the x-axis.

[6]

ii) Use any two points from the table to find the refractive index of the water.

______________________________________________________________________

___________________________________________________________________ [2]

Page 8 of 10

Physics ? Year 10 ? Track 2 ? 2018

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