Download Track 2 - Curriculum

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION
Department of Curriculum Management
Educational Assessment Unit
Track 2
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 = mg
(
)
Motion
Electricity
P = IV
E =IVt
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.
This document consists of 10 printed pages.
Physics – Form 4 Secondary – Track 2 – 2014
For Examiner’s Use Only
Question
Max
Mark
1
2
3
4
5
6
7
8
Written
Practical
8
8
8
8
8
15
15
15
85
15
Total
100
Page 1 of 10
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]

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?
Page 2 of 10

Wavelength:
________________________________

Frequency:
________________________________
[2]
Physics – Form 4 Secondary – Track 2 – 2014
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.
___________________________________________________
Figure 3
_____________________________________________________________________[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]
b) The man exerts a force of 100 N on the wall. State the size
of the other force.
_____________________________________________ [1]
Figure 4
c) According to Newton’s __________ law these forces are equal and opposite.
Physics – Form 4 Secondary – Track 2 – 2014
[1]
Page 3 of 10
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.
8.0 N
Newton meter
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)
[2]
ii) As the block is pulled along, the reading on the newton meter changes to 8.6 N.
Calculate the

resultant force;
__________________________________________________________________ [1]

acceleration of the block resulting from this force.
__________________________________________________________________ [1]
4. Wilhelm Röntgen was a German scientist. In 1895,
he was investigating a glowing gas and made an
unexpected observation. He discovered that rays
coming from the end of the glass tube penetrated
wood, a thick book and metal sheets. He called
them X-rays.
a) The diagram shows an airport X-ray scanner.
Figure 6
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.
__________________________________________________________________________
________________________________________________________________________[2]
c) State one medical use of X-rays.
________________________________________________________________________[1]
Page 4 of 10
Physics – Form 4 Secondary – Track 2 – 2014
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
12 V
temperature of boiling water.
a) Name the component labelled C shown in the diagram.
_______________________________________ [1]
40 Ω
100 Ω
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]
Beaker
C
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.
__________________________________________________________________________
__________________________________________________________________________
________________________________________________________________________[1]
Physics – Form 4 Secondary – Track 2 – 2014
Page 5 of 10
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.
Initial velocity (u)
Final velocity (v = 0 m/s)
Before Collision
After Collision
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. The mass of the crash test dummy is 90 kg. Calculate the
i) momentum of the dummy just before impact;
_____________________________________________________________________[2]
ii) momentum of the dummy just after impact;
_____________________________________________________________________[1]
iii) deceleration of the dummy during impact;
_______________________________________________________________________
_____________________________________________________________________[2]
iv) average force on the dummy during impact.
_______________________________________________________________________
_____________________________________________________________________[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 6 of 10
Physics – Form 4 Secondary – Track 2 – 2014
Physics – Form 4 Secondary – Track 2 – 2014
Page 7 of 10
7. a) A new hovercraft may be used to transport people between Mgarr, Gozo and Valletta.
Velocity m/s
B
16
C
A
0
0
D
240
720
Time /s
1200
Figure 8
i) Between B and C the hovercraft is moving with a _______________________velocity. [1]
ii) Between A and B the hovercraft is
___________________________.
[1]
iii) The maximum speed reached by hovercraft is ________________ m/s.
[1]
iv) Calculate the acceleration of the hovercraft.
__________________________________________________________________________
________________________________________________________________________[2]
v) Calculate the distance travelled during the first 240 s of the journey.
__________________________________________________________________________
__________________________________________________________________________
________________________________________________________________________[2]
vi) If the total distance is 13440 m calculate the average speed for the whole journey.
__________________________________________________________________________
________________________________________________________________________[2]
Page 8 of 10
Physics – Form 4 Secondary – Track 2 – 2014
b) A 75 kg rock, initially at rest, falls from the top of a
cliff into the sea. (Air resistance may be ignored). The
cliff
rock
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?
sea
____________________________________
____________________________________[2]
Figure 9
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.
Polythene
strip
cloth
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.
iv) This happens because the strips have (the same, opposite) charge.
Physics – Form 4 Secondary – Track 2 – 2014
[1]
[1]
Page 9 of 10
b) A student wants to investigate the circuit shown in Figure 11.
ammeter
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]
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
Page 10 of 10
Physics – Form 4 Secondary – Track 2 – 2014