Physics – Form 4 Secondary – Track 2 – 2014 Page 1 of 11

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION

Department for Curriculum Management

Educational Assessment Unit

Annual Examinations for Secondary Schools 2014

FORM 4 PHYSICS TIME: 1 hr 30 min

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 W = m g

Motion

( )

Electricity

P = I V E = I V t

Waves

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 writing

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 10 printed pages.

Track 2

Page 2 of 11 Physics – Form 4 Secondary – Track 2 – 2014

SECTION A

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

1. This question is about wave properties.

a) Figure 1 shows the cross-section of a water wave.

Figure 1

i) Which letter represents the amplitude of the wave?

____________________________[1]

ii) Which letter represents the wavelength of the wave?

___________________________[1]

b) The diagram in Figure 2 represents waves being produced in a ripple tank.

Figure 2

i) How many waves are there between A and B? _________________waves [1]

ii) The distance between AB is 40 cm. Calculate the wavelength of these waves.

_______________________________________________________________________

_____________________________________________________________________ [1]

iii) It takes 0.25 s to produce two waves. Calculate

the periodic time;

_____________________________________________________________________ [1]

the frequency.

_____________________________________________________________________ [1]

iv) Some of the water in the ripple tank is removed to make the water shallower. What

effect, if any, would this have on the wavelength and the frequency of the waves?

Physics – Form 4 Secondary – Track 2 – 2014 Page 3 of 11

Figure 3

Wavelength: ________________________________

Frequency: _______________________________ [2]

2.

a) For each of the following diagrams

i) name the phenomenon shown and,

ii) complete the rays.

mirror

Phenomenon:___________________________ Phenomenon:___________________________

[4]

b) A “bug viewer” has a plastic chamber with a magnifying lens in the

lid as shown in Figure 3. It is used to get a magnified view of small

insects placed on the base of the chamber.

i) What type of lens should be used?

_________________________________________________ [1]

ii) An ant is 1 cm long. The image produced by the lens is 2 cm

long. Calculate the magnification of the lens.

___________________________________________________

_____________________________________________________________________ [1]

iii) Name TWO properties of the image observed.

_______________________________________________________________________

_____________________________________________________________________ [2]

3. The diagram in Figure 4 shows a man pushing against a wall.

a) Draw the two contact forces acting between his hands and

the wall. [2]

Page 4 of 11 Physics – Form 4 Secondary – Track 2 – 2014

Figure 6

b) The man exerts a force of 100 N on the wall. State the size of the other force.

_____________________________________________ [1]

c) According to Newton’s __________ law these forces are equal and opposite. [1]

d) Figure 5 shows a block of mass 3 kg being pulled along at constant speed. The reading on

the newton meter is 8.0 N. The force F opposing the motion is shown by the arrow.

Figure 5

i) The force F is the force of friction and it is (less than 8.0 N, equal to 8.0 N, greater than

8.0 N ) [1]

ii) As the block is pulled along, the reading on the newton meter changes to 8.6 N.

Calculate

the resultant force;

__________________________________________________________________ [1]

the acceleration of the block resulting from this force.

__________________________________________________________________ [2]

4. Wilhelm Röntgen was a German scientist. In

November 1895 he was investigating a glowing gas

when he made an unexpected observation. He

discovered that rays were coming from the end of

the glass tube and these penetrated wood, a thick

book and metal sheets. He called them X-rays.

a) The diagram shows an airport X-ray scanner.

Calculate the wavelength of the X-ray beam if it has a frequency of 7×1017

Hz and a speed

of 3×108 m/s.

__________________________________________________________________________

________________________________________________________________________ [2]

b) Visible light, X-rays, Infra-red radiation and Radio waves form part of the

electromagnetic spectrum. Name TWO properties that all electromagnetic waves have in

common.

8.0 N Newton meter

Figure 4

Physics – Form 4 Secondary – Track 2 – 2014 Page 5 of 11

__________________________________________________________________________

________________________________________________________________________ [2]

c) State one medical use of X-rays.

________________________________________________________________________ [1]

d) Each object in the table below emits one main type of electromagnetic wave. Complete the

table by writing in the name of the type of wave.

Object Main type of electromagnetic wave

airport scanner X - rays

television remote control

light bulb

radio transmitter

[3]

5. The diagram shows a circuit that may be used to

measure the temperature of boiling water.

a) Name the component labelled C shown in the

diagram.

_______________________________________ [1]

b) The voltmeter reads a voltage of 4 V when the water

is boiling. Calculate the current flowing through the

circuit at this time.

__________________________________________

_______________________________________ [2]

c) Calculate the total resistance of the circuit.

__________________________________________

__________________________________________

_______________________________________ [2]

d) If the current flowing through component C is 0.02 A, calculate its resistance.

__________________________________________________________________________

________________________________________________________________________ [2]

e) Explain what would happen to the current read by ammeter A if the water is left to cool

down.

C

12 V

40 Ω 100 Ω

Beaker

Page 6 of 11 Physics – Form 4 Secondary – Track 2 – 2014

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [1]

SECTION B

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

paper.

6. Figure 7 below shows a car with a crash test dummy before and after a collision test. During

several test collisions the following data of the change in momentum experienced by the dummy

for different initial velocities was collected. The mass of the crash test dummy is 90 kg.

Figure 7

Change in momentum (kg m/s) 0 450 900 1350 1800 2250

Velocity (m/s) 0 5 10 15 20 25

a) Plot a graph of change in momentum in kg m/s on the y-axis against velocity in m/s on

the x-axis. [5]

b) During one collision the impact time to reduce the dummy’s speed from 30 m/s to 0 m/s is

1.5 s. Calculate

i) the momentum of the dummy just before impact;

_____________________________________________________________________ [2]

ii) the momentum of the dummy just after impact;

_____________________________________________________________________ [1]

iii) the deceleration of the dummy during impact;

_______________________________________________________________________

_____________________________________________________________________ [2]

iv) the average force on the dummy during impact.

_______________________________________________________________________

Initial velocity (u) Final velocity (v = 0 m/s)

Before Collision After Collision

Physics – Form 4 Secondary – Track 2 – 2014 Page 7 of 11

_____________________________________________________________________ [2]

c) As the time of collision increases the force acting on the dummy

____________________[1]

d) Name TWO features of the car that help to reduce injury during a collision.

__________________________________________________________________________

________________________________________________________________________ [2]

Page 8 of 11 Physics – Form 4 Secondary – Track 2 – 2014

Physics – Form 4 Secondary – Track 2 – 2014 Page 9 of 11

7. A new hovercraft may be used to transport people between Mgarr

Gozo and Valletta.

Figure 8

a) Between B and C the hovercraft is moving with a _______________________velocity. [1]

b) Between A and B the hovercraft is ___________________________. [1]

c) The maximum speed reached by hovercraft is ________________ m/s. [1]

d) Calculate the acceleration of the hovercraft.

__________________________________________________________________________

________________________________________________________________________ [2]

e) Calculate the distance travelled during the first 240 s of the journey.

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [2]

f) If the total distance is 13440 m calculate the average speed for the whole journey.

__________________________________________________________________________

________________________________________________________________________ [2]

g) A 75 kg rock, initially at rest, falls from the top of

a cliff into the sea. (Air resistance may be ignored).

The rock takes 3 s to hit the water surface.

i) Name the downward force acting on the rock.

____________________________________ [1]

ii) What is the initial velocity of the rock?

______________________________________

____________________________________ [2]

0 240 720 1200

D

C B

A 0

16

Velocity m/s

Time /s

cliff rock

sea

Figure 9

Page 10 of 11 Physics – Form 4 Secondary – Track 2 – 2014

iii) Calculate the final velocity with which it hits the water.

_______________________________________________________________________

_____________________________________________________________________ [2]

iv) Underline the correct answer: The acceleration of a 100 kg rock is (greater than, smaller

than, equal to) that of the 75 kg rock. Air resistance is negligible. [1]

8. A polythene strip is rubbed with a piece of cloth as shown in Figure 10.

Figure 10

a) Underline the correct answer in each case.

i) During rubbing, electrons are transferred (to, from) the polythene strip. [1]

ii) This will make the polythene (negatively, positively) charged and leaves the cloth

(negatively, positively) charged. [1]

iii) Another charged polythene strip is placed next to the polythene strip. They will

(attract, repel) each other. [1]

iv) This happens because the strips have (the same, opposite) charge. [1]

b) A student wants to investigate the circuit shown in Figure 11.

Figure 11

i) In the space provided, draw the circuit shown in Figure 11 using correct circuit symbols.

[3]

ii) What does an ammeter measure?

_____________________________________________________________________ [1]

iii) Name the instrument needed to measure the voltage across the 10 Ω resistor.

_____________________________________________________________________ [1]

Polythene

strip

cloth

0 Ω

5 Ω

ammeter

Physics – Form 4 Secondary – Track 2 – 2014 Page 11 of 11

iv) Using the correct symbol, add this instrument to your circuit diagram. [1]

v) Calculate the total resistance of the circuit.

_______________________________________________________________________

_____________________________________________________________________[2]

vi) Calculate the current through the circuit if the battery voltage is 12 V.

_______________________________________________________________________

_____________________________________________________________________[2]

vii) Underline: The two resistors are now connected in parallel. The new total resistance

(increases, decreases, remains the same). [1]

END OF PAPER