Physics – Form 5 Secondary – Track 3 – 2017 Page 1 of 14
DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION
Department of Curriculum Management
Educational Assessment Unit
Annual Examinations for Secondary Schools 2017
FORM 5 PHYSICS TIME: 2 hours
Name: _____________________________________ Class: _______________
Answer ALL questions in the spaces provided on the Examination Paper.
All working must be shown. The use of a calculator is allowed.
Where necessary take the acceleration due to gravity 𝐠 = 𝟏𝟎 𝐦/𝐬𝟐.
Marks Grid: For the Examiners’ use ONLY
Question 1 2 3 4 5 6 7 8 9 10 11 12 Th. Prac Total Final Mark
Mark 10 10 10 10 10 10 10 20 20 20 20 20 170 30 200 100
Score
Density m = ρ V
Pressure P = ρ g h F = P A
Moments Moment = F × perpendicular distance
Energy PE = m g h KE =
1
2mv2 Work Done = F s
Work Done = Energy Converted E = P t
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
P = I V R ∝ 𝐿/𝐴 E = I V t
RT = R1 + R2 + R3 1
RT=
1
R1+
1
R2
Electromagnetism N1
N2=
V1
V2
Heat ΔQ = m c Δθ
Waves
η =real depth
apparent depth η =
the speed of light in air
the speed of light in medium
v = f λ
f =1
T
m =hi
ho=
image distance
object distance
Radioactivity A = Z + N
Track 3
Page 2 of 14 Physics – Form 5 Secondary – Track 3 – 2017
Section A: This section has 7 questions. Each question carries 10 marks (70 marks).
1. A student hangs an iron block to a stand and clamp
as shown in Figure 1.
a) Name the apparatus X that is used to measure
the weight of the iron block.
____________________________________ [1]
b) Draw and label the forces acting on the iron bar
in Figure 1 (a). [2]
c) The student lowers the iron block in a measuring
cylinder as in Figure 1 (b). The liquid in the
measuring cylinder rises from 50 cm3 to
203 cm3.
i) Calculate the volume of the iron block.
____________________________________________________________________________ [2]
ii) Calculate the mass of the iron block in grams and hence determine the density of the iron block.
_______________________________________________________________________________
____________________________________________________________________________ [3]
iii) The student replaces the liquid in the measuring cylinder with one that has a higher density. Will
this affect the density of the iron block? Explain your answer.
_______________________________________________________________________________
____________________________________________________________________________ [2]
2. Nicole uses a computer simulation to
determine the weight of steel blocks with
different masses on the moon. She presents the
data as shown in the graph of Figure 2.
a) Weight is a vector quantity. Define a vector
quantity.
_____________________________________
__________________________________ [2]
b) Nicole reads off the weight of the 3 kg mass
wrongly. Use the graph to find the correct
value of the weight of the 3 kg mass.
__________________________________ [1]
12 N X
(a) (b)
Figure 1
Figure 2
Physics – Form 5 Secondary – Track 3 – 2017 Page 3 of 14
c) Determine the acceleration due to the gravity on the moon by finding the gradient of the graph.
__________________________________________________________________________________
_______________________________________________________________________________ [3]
d) What is the relationship between the weight 𝑊 and the mass 𝑚? Give a reason for your answer.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
e) Nicole repeats the same simulation using the Earth’s gravitational acceleration. On the same graph
of Figure 2, sketch the new line graph that she obtains. [2]
3. Plutonium-242 (Pu-242) is a silvery radioactive solid. The symbol for plutonium-242 nucleus is Pu94242 .
a)
i) Underline: When radioactive decay occurs, a nucleus which is (unstable, stable, unchanging)
decays to a more stable nucleus by emitting radiation. [1]
ii) The proton number Z of Pu-242 is _____________. [1]
iii) Calculate the neutron number N of Pu-242. _____________. [1]
b) Table 1 shows the properties of the three types of radiation. Complete the table, by filling in the
type of radiation.
Nature Electromagnetic wave Particle Particle
Nucleon Number A none 0 4
Proton Number Z none -1 2
Type of Radiation
[3]
c) The activity of a sample of Iodine-131 drops from 8000 counts per minute to 500 count per minute
in 32 days. Calculate the half-life of the sample of iodine.
__________________________________________________________________________________
_______________________________________________________________________________ [4]
4. Two metal conducting spheres L and M are on insulating stands. L and M
are positively charged.
a) What is the difference between conducting and insulating materials?
___________________________________________________________
___________________________________________________________
___________________________________________________________
_________________________________________________________ [2]
(a)
(b)
L M
L M
Figure 3
Page 4 of 14 Physics – Form 5 Secondary – Track 3 – 2017
b) The charge on sphere L is 0.0042 C while that on sphere M is 0.0035 C. The spheres are placed in
contact with each other. What is the net final charge on both spheres?
_______________________________________________________________________________ [3]
c) The spheres are earthed by touching them (see Figure 3 b). The net charge found in part (b) flows
between the spheres and earth in 0.01 s. Calculate the current flow.
__________________________________________________________________________________
_______________________________________________________________________________ [3]
d) Explain, in terms of the movement of electrons, what happens to the charge on the spheres when
they are earthed.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
5. Johnny is splitting wooden logs for the stove. He uses the setup
shown in Figure 4. The total mass of the blade and the rod is 3 kg.
a) The contact area between the blade and the log is 0.0002 m2.
Calculate the pressure exerted by the rod and blade on the log.
______________________________________________________
___________________________________________________ [3]
b) Johnny adds a sliding mass to the rod. He releases the mass and
it hits the blade, exerting an extra force of 80 N. Calculate the
maximum pressure exerted by the system.
______________________________________________________
______________________________________________________
_______________________________________________________________________________ [4]
c) Without changing the blade, state TWO ways how Johnny can increase the pressure exerted on the
log.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
d) After several uses, the blade becomes blunt (less sharp). How will this affect the pressure exerted
by the blade?
__________________________________________________________________________________
_______________________________________________________________________________ [1]
Figure 4
Physics – Form 5 Secondary – Track 3 – 2017 Page 5 of 14
6. Figure 5 shows a bar magnet being pulled out of the solenoid.
Figure 5
a)
i) Underline: In electromagnetic induction, (Faraday’s, Lenz’s, Snell’s) law states that when the
rate of cutting of magnetic flux increases, the induced current flowing through the solenoid
increases. [1]
ii) The magnet is pulled away from the solenoid. State the magnetic pole that is induced at end C
of the solenoid.
____________________________________________________________________________ [1]
iii) In which direction will the needle on the galvanometer deflect as the magnet is pulled away
from the solenoid?
____________________________________________________________________________ [1]
b) Part AB of the graph in Figure 6 shows how the
current changes as the magnet is moved inside the
solenoid.
i) Which section of the graph shows that the magnet
stopped moving inside the solenoid? Explain.
___________________________________________
___________________________________________
________________________________________ [3]
ii) State what is observed on the galvanometer during
section CD of the graph. Explain.
____________________________________________________________________________ [2]
iii) The same procedure is repeated using a weaker magnet. On the same graph, sketch a curve that
represents the induced current by this weaker magnet. [2]
C D
NS
D A B C
Figure 6
Page 6 of 14 Physics – Form 5 Secondary – Track 3 – 2017
7. An asteroid is orbiting the Sun as
shown in Figure 7.
a) In which of the positions, A, B, C
or D is the effect of the Sun’s
gravity on this asteroid greatest?
Explain.
____________________________
_________________________ [2]
b) The table below gives information about three of the planets in our solar system.
Planet Average distance from sun
(millions of km)
Time for one orbit
(Earth years)
Average surface temperature
(°𝐂)
Venus 105 0.62 400
Mars 225 1.88 -55
Neptune 4515 165 -200
i) Use information in the above table to help you explain how the surface temperature of these
planets varies with distance from the Sun.
_______________________________________________________________________________
____________________________________________________________________________ [2]
ii) Calculate how many days there are in ONE year on Mars.
_______________________________________________________________________________
____________________________________________________________________________ [2]
iii) Calculate the time taken for light rays from the Sun to reach planet Neptune if the speed of light
is 300 000 000 m/s.
_______________________________________________________________________________
____________________________________________________________________________ [2]
iv) Name ONE benefit of space exploration.
_______________________________________________________________________________
____________________________________________________________________________ [1]
v) Name ONE unanswered question about the universe.
_______________________________________________________________________________
____________________________________________________________________________ [1]
Figure 7
Physics – Form 5 Secondary – Track 3 – 2017 Page 7 of 14
Section B. This section has 5 questions. Each question carries 20 marks (100 marks).
8. This question is about light and its properties.
a) Light is an electromagnetic wave. Name TWO properties common to all electromagnetic waves.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
b) An archer fish is able to prey on insects by
shooting a jet of water from its mouth.
i) On Figure 8, draw an arrow to indicate the
direction of the ray of light that enables the
fish to see the insect. [1]
ii) Mark with an ‘x’ the position where the
fish sees the image of the insect. [1]
iii) Name the phenomenon which causes the light to bend as it changes medium.
____________________________________________________________________________ [1]
iv) If the critical angle for water is exceeded, the fish is not able to see the insect at all. Explain.
_______________________________________________________________________________
____________________________________________________________________________ [1]
c) Britney investigates the relationship between the object distance and image distance of a convex
lens as shown in Figure 9. She tabulates her results.
Figure 9
i) Describe briefly how she carries out the experiment.
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
____________________________________________________________________________ [3]
ii) Plot a graph of image distance (cm) on the y-axis against object distance (cm) on the x-axis.
Draw the best fit curve through your points. [5]
Object distance (cm) 15.0 20.0 25.0 30.0 35.0 40.0
Image distance (cm) 30.0 20.0 16.7 15.0 14.0 13.3
object distance
image distance lens
screen
illuminated object
water
air
Figure 8
Page 8 of 14 Physics – Form 5 Secondary – Track 3 – 2017
Physics – Form 5 Secondary – Track 3 – 2017 Page 9 of 14
d) A convex lens has a focal length of 2 cm. An object of height 1.6 cm is placed 3 cm away from the
centre of the lens.
i) Draw a ray diagram to scale to show how the image forms. [3]
ii) State ONE characteristic of the image formed.
____________________________________________________________________________ [1]
iii) Calculate the magnification of the lens.
____________________________________________________________________________ [2]
9. This question is about electromagnetism and its applications.
a) Draw the magnetic field pattern for each of the following diagrams.
(i) (ii)
lens
cardboard
copper
wire solenoid
[2] [3]
Page 10 of 14 Physics – Form 5 Secondary – Track 3 – 2017
b) Mark is supplied with three identical rods made of different metals: aluminium, steel and iron. He
wants to construct an electromagnet. Explain why neither aluminium nor steel can be used.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
c) When the switch is closed, the copper rod shown in Figure 10 starts rolling.
i) State why the copper rod starts to roll.
____________________________________________________________________________ [2]
ii) On Figure 10, draw an arrow to show the direction in which the copper rod rolls. [1]
iii) Name the rule used to find the direction in which the rod rolls.
____________________________________________________________________________ [1]
iv) State ONE way through which the copper rod can be made to roll faster.
____________________________________________________________________________ [1]
v) Name a suitable application for the effect observed in Figure 10.
____________________________________________________________________________ [1]
d) A device called a solenoid valve is represented in Figure 11. The iron rod, plunger and plug are
connected together and can move vertically upwards or downwards.
i) Explain why water can flow when the switch is
closed.
________________________________________
________________________________________
________________________________________
________________________________________
________________________________________
_____________________________________ [4]
switch
copper rod
aluminium rod
battery
powerful magnet
-
coil
iron rod
spring (fixed)
water in
switch
plug
hole
+
water out
d.c. supply
plunger
Figure 10
Figure 11
Physics – Form 5 Secondary – Track 3 – 2017 Page 11 of 14
ii) Explain the function of the spring while the circuit is switched off.
_______________________________________________________________________________
____________________________________________________________________________ [1]
iii) The current flowing through the coil is reversed. Does the device work? Explain.
____________________________________________________________________________ [2]
10. This question is about energy and motion.
a) Paul wants to join the army. His agility skills are tested by climbing a flight of steps in the shortest
time possible. His mass is 60 kg and he climbs 10 steps in 2.5 seconds. Each step is 15 cm high.
i) Calculate the total height of the steps in metres.
____________________________________________________________________________ [2]
ii) Calculate the gravitational potential energy gained when he reaches the tenth step.
____________________________________________________________________________ [2]
iii) Calculate his power.
____________________________________________________________________________ [2]
iv) Paul climbs another staircase which has 13 steps. Does his power change? Explain.
____________________________________________________________________________ [2]
b) Another test consists of firing a bullet towards a wooden block from a short
distance. Using a gun of mass 3 kg, Paul fires a bullet of mass 0.02 kg with a
speed of 300 m/s.
i) What is the total momentum before the gun is fired? Explain.
____________________________________________________________________________ [2]
ii) Calculate the recoil velocity of the gun after firing. (Ignore the mass of Paul.)
_______________________________________________________________________________
_______________________________________________________________________________
____________________________________________________________________________ [2]
iii) The bullet hits and becomes embedded in the wooden block of mass 2.8 kg. Calculate the
common velocity with which they continue to move.
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
____________________________________________________________________________ [3]
Page 12 of 14 Physics – Form 5 Secondary – Track 3 – 2017
iv) Name and state the principle used in part b (ii) and part b (iii).
_______________________________________________________________________________
_______________________________________________________________________________
____________________________________________________________________________ [3]
c) During his training Paul wears a helmet that is padded with foam on its inside. Explain in terms of
Physics principles why this helps to prevent injury.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
11. This question is about methods of heat transfer.
Miss Mifsud shows her students the apparatus in Figure 12. It consists of a heat resistant plastic board held
vertically by means of two stands. An electric heater is fixed at the centre and three temperature sensors
A, B and C are installed at the same distance from the heater. The heater is switched on and the temperature
of each sensor is measured at two minute intervals for ten minutes.
Figure 12
a) The results are plotted as shown. Label correctly each graph obtained for sensors A, B and C.
[3]
b) The room temperature = _____________ °C [1]
c) Name the method of heat transfer through which heat reaches all the sensors.
_______________________________________________________________________________ [1]
d) The heat cannot be transferred to the sensors by conduction. Why?
_______________________________________________________________________________ [2]
e) Explain the results she obtains.
__________________________________________________________________________________
__________________________________________________________________________________
_______________________________________________________________________________ [3]
A
B
C
heater
stands 0
5
10
15
20
25
30
35
40
45
50
0 2 4 6 8 10 12
time /(minutes)
board
Temperature
(°C)
Physics – Form 5 Secondary – Track 3 – 2017 Page 13 of 14
f) On Figure 12, mark with a ‘D’, a sensor which when placed at the same distance from the heater
registers the same temperature change as ‘A’. [2]
g) Before starting the experiment, Miss Mifsud noticed that one of the sensors was shiny, while the
other two were black. She replaced the shiny one with a black one. Explain why she did so.
__________________________________________________________________________________
_______________________________________________________________________________ [3]
h) Name TWO ways through which the results can be obtained in a shorter time.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
i) How would the results of this experiment change if it is carried out in a vacuum? Explain.
__________________________________________________________________________________
_______________________________________________________________________________ [3]
12. This question is about electricity.
a) Complete the following table.
Component Symbol Function
Diode
LDR Its resistance varies according to light intensity.
[5]
b) A student is provided with a metal
wire, a d.c. supply, a switch,
connecting wire, an instrument to
measure current and one to measure
voltage.
i) In the space provided draw the
circuit required to find its
resistance at room temperature.
Label all components. [3]
ii) Explain briefly how the result is obtained.
_______________________________________________________________________________
_______________________________________________________________________________
____________________________________________________________________________ [3]
Page 14 of 14 Physics – Form 5 Secondary – Track 3 – 2017
c) A sandwich toaster has a power rating of 800 W and is used daily for 20 minutes.
i) Given that 1 kWh costs 18 c, calculate the total cost of using the toaster for 2 weeks.
_______________________________________________________________________________
____________________________________________________________________________ [2]
ii) Calculate the current flowing through the toaster if its voltage is 230 V.
____________________________________________________________________________ [1]
iii) Suggest a suitable fuse rating for the toaster.
____________________________________________________________________________ [1]
d) A current of 0.8 A flows through the 3 Ω resistor in
Figure 13.
i) Calculate the potential difference across the 3 Ω
resistor.
_____________________________________________
__________________________________________ [1]
ii) Calculate the current flowing through the 2 Ω resistor.
_______________________________________________________________________________
____________________________________________________________________________ [2]
iii) Calculate the resistance of resistor R.
_______________________________________________________________________________
____________________________________________________________________________ [2]
Y
6 V
R
3
2
Figure 13
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