Physics – Year 10 – Track 2 – 2019 Page 1 of 12

DEPARTMENT FOR CURRICULUM,

LIFELONG LEARNING AND EMPLOYABILITY

Directorate for Learning and Assessment Programmes

Educational Assessment Unit

Annual Examinations for Secondary Schools 2019

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

2at

2

v = u + at v2 = u2 + 2as Momentum = mv

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 – 2019

SECTION A

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

Kelsey would like to do some research about

the properties of an LDR and sets up the circuit

shown in Figure 1.

What does LDR stand for?

_____________________________ [1]

Add an ammeter to Figure 1 to measure

the current passing through the circuit.

[1]

If the resistance of the LDR is 400 kΩ when the LDR is in a dark room and

the fixed resistor has a resistance of 4000 Ω, find:

The total resistance of the LDR and the fixed resistor.

_____________________________________________________ [2]

The current passing through the circuit.

________________________________________________________

_____________________________________________________ [2]

Kelsey opens the door of the room and the LDR is no longer in the dark. What

will happen to the current flowing in the circuit? Explain.

____________________________________________________________

__________________________________________________________ [2]

A hovercraft travels from Valletta to Pozzallo in Sicily. The hovercraft and

passengers have a total mass of 3.0 × 104 kg.

Calculate the value (size) of the upward force as it travels at constant height.

_____________________________________________________________ [2]

The graph in Figure 2 shows how the speed varies with time from when the

hovercraft leaves Valletta till when it arrives in Pozzallo.

Figure 2

0

5

10

15

20

25

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000

Velo

city in m

/s

Time in seconds

A graph of Velocity against Time

16 V

LDR fixed resistor

4000 Ω

Figure 1

Physics – Year 10 – Track 2 – 2019 Page 3 of 12

Use the graph in Figure 2 to:

calculate the acceleration of the hovercraft.

____________________________________________________________

_________________________________________________________ [2]

find the total distance moved.

____________________________________________________________

__________________________________________________________ [2]

work out the average speed of the hovercraft.

__________________________________________________________ [1]

draw the average speed on the graph in Figure 2. [1]

Figure 3 below shows two buoys which are floating 3 m apart.

Figure 3

Calculate:

the wavelength of the sea waves shown in Figure 3.

_____________________________________________________ [2]

the frequency of the waves given that ten complete waves pass in 20 s.

______________________________________________________[1]

the speed of the sea waves.

______________________________________________________ [2]

The sea waves approach a wall as

shown in Figure 4.

On Figure 4 draw the three

wavefronts and their direction after

the wall reflects them. [2]

After hitting the wall, the waves

have a smaller amplitude. Explain.

_______________________________

____________________________ [1]

3 m buoy

wall wavefronts

N

Figure 4

Page 4 of 12 Physics – Year 10 – Track 2 – 2019

The wavelengths of waves in the electromagnetic spectrum range from

approximately 10−13 m for gamma to 103 m for radio waves as shown in Figure 5.

Figure 5

Name the radiation in the regions A and B.

____________________________________________________________

__________________________________________________________ [2]

Name TWO properties common to all waves in the electromagnetic spectrum.

____________________________________________________________

__________________________________________________________ [2]

State one use of:

ultraviolet rays.

______________________________________________________ [1]

gamma rays.

______________________________________________________ [1]

infrared rays.

______________________________________________________ [1]

Visible light is divided into a spectrum of colours of different wavelengths.

Red, orange, violet and green are part of the visible spectrum. Red has the

longest wavelength and violet has the shortest wavelength of the visible

spectrum. Complete the table shown below with the appropriate colour

(orange or green) for each wavelength. [1]

Colour Approximate Wavelength (× 10−7 m)

violet 4.0

5.5

6.0

red 7.0

A B

m

Physics – Year 10 – Track 2 – 2019 Page 5 of 12

Andrew, of mass 65 kg, skates with a velocity of 5 m/s towards Alexandra who is

momentarily at rest, as shown in Figure 6. He joins Alexandra, of mass 55 kg.

After joining, Andrew and Alexandra move together for a short distance.

Figure 6

Calculate Andrew’s momentum before joining Alexandra.

____________________________________________________________

__________________________________________________________ [2]

What is the value of Alexandra’s momentum before Andrew joins her?

__________________________________________________________ [1]

Determine the value of their total momentum after joining.

__________________________________________________________ [1]

Find the common initial velocity as they start moving off together.

____________________________________________________________

__________________________________________________________ [2]

Later on, Andrew and Alexandra come to rest. They decide to face each other

and push each other apart. Andrew moves off with a speed of 3 m/s in one

direction whilst Alexandra moves off in the opposite direction. Does Alexandra

move off with a smaller speed, the same speed or a larger speed than

Andrew? Explain your reasoning.

____________________________________________________________

____________________________________________________________

__________________________________________________________ [2]

m = 55 kg

(at rest) m = 65 kg

v = 5 m/s

Page 6 of 12 Physics – Year 10 – Track 2 – 2019

SECTION B

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

This question is about light rays.

A mirror is fixed on a road so that a car P has a better field of view on oncoming cars as shown in Figure 7.

Figure 7

On Figure 7, draw a ray of light to show how the driver of car P can see

car Q. Label the incident ray and the reflected ray. Show clearly the

direction of travel of the light rays. [3]

Label the angle of incidence with a letter ‘x’. [1]

On the diagram show the position of the image and label it ‘I’. [1]

Underline the correct answer:

The object distance is (greater than, equal to, smaller than) the image

distance. [1]

Name one other property of an image formed in a plane mirror.

_____________________________________________________ [1]

car Q

mirror

car P

normal

Physics – Year 10 – Track 2 – 2019 Page 7 of 12

Figure 8 shows a light ray travelling through an optical fibre made of glass.

Figure 8

Fill in the blanks using some of the words below.

increases, less dense, critical, denser, reflected, decreases

As the ray of light travels from air to glass, its speed ________________ because

it enters an optically ________________ medium. The light ray is reflected

multiple times until it emerges from side A. This phenomenon occurs whenever

the angle of incidence is greater than the ________________ angle. [3]

What is the phenomenon described in Figure 8 called?

______________________________________________________ [1]

The ray diagram below shows the lens set up for a simple projector.

Complete the ray diagram by adding the missing rays. [3]

Use your ray diagram to find the magnification of the lens.

________________________________________________________

______________________________________________________ [1]

optical fibre

ray of light

air

A

I

Page 8 of 12 Physics – Year 10 – Track 2 – 2019

This question is about electricity.

Nathan and Kaya are in the family garage and find a box full of copper wires, a

16 V battery, some resistors, a rheostat, crocodile clips and a switch.

Nathan wants to investigate the voltage-current characteristics of one of the

resistors. They set up a circuit as shown in Figure 9.

Figure 9

They measure the current and voltage of resistor R. They then repeat the

experiment each time changing the resistance of the rheostat. The measurements

of voltage and current of resistor R are shown in the table below.

I (A) 0 0.1 0.2 0.3 0.4 0.5 0.6

V (V) 0 2.0 4.0 6.0 8.0 10.0 12.0

Plot a graph of Voltage on the y-axis against Current on the x-axis. [5]

Explain why Nathan and Kaya can conclude that resistor R is an ohmic

conductor.

________________________________________________________

_____________________________________________________ [1]

Using the graph or otherwise, calculate the resistance of R.

________________________________________________________

_____________________________________________________ [1]

R

16 V battery switch

rheostat

Physics – Year 10 – Track 2 – 2019 Page 9 of 12

Page 10 of 12 Physics – Year 10 – Track 2 – 2019

Kaya notices that the wires have different thicknesses. She thinks that the

thicker the wire, the more current will pass through it. They decide to test this

idea. They set up the circuit shown in Figure 10.

Figure 10

Apart from using wires of the same length, mention TWO precautions

needed to ensure accurate results.

________________________________________________________

______________________________________________________ [2]

Predict what happens to the current as the thickness increases.

________________________________________________________

______________________________________________________ [1]

Complete the table by writing down the numbers 1, 2, 3, 4 and 5 to

show the order of the steps they should follow to carry out the

experiment.

They connect a wire of known thickness across the crocodile clips.

They cut the wires so that these are of the same length.

They tabulate their results and plot a graph.

They repeat the procedure by using the other wires.

They switch on the circuit and record the current.

[5]

crocodile clips

battery fixed resistor

switch

Physics – Year 10 – Track 2 – 2019 Page 11 of 12

This question is about motion.

Cars are tested for safety in special laboratories using dummies instead of

persons to simulate accidents, as shown in Figure 11.

Figure 11

When the car hits the wall, the dummy continues to move forward.

Explain why, by referring to Newton’s laws of motion.

________________________________________________________

______________________________________________________ [2]

The seat belt stretches slightly during the crash. Explain in terms of

physics principles why this helps to prevent injury.

________________________________________________________

______________________________________________________ [2]

Mention one other safety feature in cars.

______________________________________________________ [1]

Please turn the page

wall

dummy

Page 12 of 12 Physics – Year 10 – Track 2 – 2019

A person driving a car at a uniform velocity of 20 m/s sees a cat 37 m away,

as shown in Figure 12.

Figure 12

Given that the person’s reaction time is 0.3 s, calculate the distance

which the car travels during this time interval.

_____________________________________________________ [1]

The distance calculated in question b i) is known as the ____________

distance. [1]

Name TWO factors which affect the distance measured in b i).

________________________________________________________

______________________________________________________ [2]

The driver takes a further 3 seconds to stop the car. Calculate the

deceleration of the car.

________________________________________________________

______________________________________________________ [2]

Calculate the distance travelled from the moment he starts braking till

the car stops.

________________________________________________________

______________________________________________________ [2]

Use your answer in b v) to explain whether the car will hit the cat or not.

________________________________________________________

______________________________________________________ [2]

37 m cat