GOZO COLLEGE
Track 2
Half Yearly Examinations for Secondary Schools 2016
_________________________________________________________________________
FORM 4
PHYSICS
TIME: 1h 30min
______________________________________________________________
Name: __________________
Class: _________
Answer all questions.
All working must be shown. The use of a calculator is allowed.
Where necessary take acceleration due to gravity g = 10m/s 2.
Forces
W = mg
Motion
Optics
v = u + at
s = ut + ½ a t 2
s = (u+v) t
2
Average speed = Total distance
Total time
n
= speed of light (air)
speed of light (medium)
v2 = u2 + 2as
n = real depth
apparent depth
m = hi/ho
Others
Area of triangle = ½ b h
Waves
Number
Maximum
mark
Actual
mark
m = v/u
Area of trapezium = ½ (a + b)h
f = 1
T
v = f λ
1
2
3
4
5
6
7
8
Total
8
8
8
8
8
15
15
15
85
Total Theory
Total Practical
Final Mark
85
15
100
Actual Mark
Maximum Mark
Physics – Form 4 Secondary – Track 2 – 2016
Page 1 of 8
SECTION A
Each question carries 8 marks. This section carries 40 marks of the total marks for this paper.
1. A slinky spring is stretched on a table. A wave travels from end A to end B.
a) Draw on the diagram how point X will move when a transverse wave passes along the spring.[1]
b) Give one example of a transverse wave and one example of a longitudinal wave.
Transverse: ______________________: Longitudinal: ____________________________
[2]
c) If distance between A and B is 1.5 m and it takes 2 seconds for the wave to travel, calculate the
speed of wave.
__________________________________________________________________________
__________________________________________________________________________
[2]
d) Determine the frequency of this wave if there are 12 waves between A and B.
__________________________________________________________________________
[1]
e) Calculate the wavelength of this wave.
__________________________________________________________________________
__________________________________________________________________________
[2]
2. Astronauts on the Moon wear special suits designed to prevent dangerous radiation from reaching
their bodies.
a) Name two radiations present on the Moon that can harm the astronauts.
___________________________________________________
b) State the speed in a vacuum of these electromagnetic waves.
[2]
___________________________________________________
[1]
c) Can sound waves be present on the moon? Explain.
___________________________________________________
___________________________________________________
Page 2 of 8
[2]
Physics – Form 4 Secondary – Track 2 – 2016
d) Which types of waves can astronauts use to communicate with someone on earth?
_____________________________________________________________________
e)
[1]
If the signal sent from the Moon takes 1.28 s to reach the Earth and the velocity of the signal is
300 000 000 m/s calculate the distance between the moon and the earth.
_______________________________________________________________________
____________________________________________________________________
[2]
3. A ray of light is incident on a glass block passes through the glass and is reflected by the mirror at
the opposite side.
a) Draw on the diagram above the path followed by a ray of light as it enters the glass block and is
reflected by the mirror.
[3]
b) What is the relationship between the angle of incidence and the angle of reflection on the plane
mirror?
____________________________________________________________________
[1]
c) What happens to the speed of light as it enters the glass block? Explain.
_____________________________________________________________________
[2]
d) Calculate the speed of light in the glass block if refractive index of glass is 1.5 and speed of light
in air is 300 000 000 m/s.
_______________________________________________________________________
______________________________________________________________________
Physics – Form 4 Secondary – Track 2 – 2016
[2]
Page 3 of 8
4. The following distance time graph shows Amy’s walk around the countryside.
A
10
Distance - Km
5
0
1
2
3
4
Time - hours
a) After how many hours does Amy stop for a break during her walk?
__________________________________________________________________________ [1]
b) What is the total distance walked by Amy?
__________________________________________________________________________ [1]
c) How long did Amy take to arrive to point A? Give answer in seconds.
__________________________________________________________________________ [2]
d) Calculate the average speed of Amy’s walk.
__________________________________________________________________________
__________________________________________________________________________ [2]
e) Amy walks faster before or after the break? Explain your answer.
__________________________________________________________________________
__________________________________________________________________________ [2]
Page 4 of 8
Physics – Form 4 Secondary – Track 2 – 2016
5. The diagram below shows water waves in a ripple tank moving from deep to shallow water.
a)
a) Label the incident ray on the diagram and mark the wavelength of these waves.
[2]
b) Complete the diagram to show the water waves in the shallow water.
[2]
c) What name is given to this change of direction of the water waves? ___________________ [1]
d) Complete the following sentences by underlining the correct word or phrase in the brackets.[3]
(i) When the wave passes into shallow water the wavelength
(Increases / decreases / stays the same).
(ii) When the wave passes into shallow water the speed of the wave
(Increases / decreases / stays the same).
(iii)When the wave passes into shallow water the frequency of the wave
(Increases / decreases / stays the same).
Physics – Form 4 Secondary – Track 2 – 2016
Page 5 of 8
SECTION B
Each question carries 15 marks.
6. Sonar is widely used for mapping the sea bed and for
tracking undersea objects. Sonar is high frequency sound
known as ultrasound.
a) Can sonar sounds be heard by human beings?
________________________________
[2]
distance
- m
0
15
30
45
60
75
time
-
0
0.01
0.02
0.03
0.04
0.05
s
b) The distance travelled by sonar was measured for different time intervals.
i. Plot a graph of distance on the y-axis against Time on the x –axis.
[5]
ii. From the graph or otherwise find velocity of sound in water.
_____________________________________________________________________
[2]
c) A fishing boat, using sonar, sends out an ultrasound pulse into the water.
i. Two echoes are received back, one later than the other. Explain why.
_______________________________________________________________________
[2]
ii. If the signal takes 0.0075 s to reach the bottom, how long will it take to reach the boat?
_______________________________________________________________________
[1]
iii. Find the depth of the sea.
_______________________________________________________________________
[2]
iv. Hence, calculate the total distance travelled by the signal.
_______________________________________________________________________
Page 6 of 8
[1]
Physics – Form 4 Secondary – Track 2 – 2016
7. (a)A child steps out in the
path of a car in a busy
street. The graph shows
how the speed of the car
changes from the moment
the driver sees the child
until the car stopped.
i.
What is the driver's
reaction time in
seconds?
__________________________
ii.
[1]
Name two factors affecting the driver reaction time?
_______________________________________________________________________ [2]
iii.
Calculate the braking time taken by the car to stop?
_______________________________________________________________________ [1]
iv.
Calculate the deceleration of the car while the brakes are being applied.
_______________________________________________________________________
_______________________________________________________________________ [2]
v.
Calculate the total distance travelled by the car from the moment the driver saw the child.
_______________________________________________________________________
_______________________________________________________________________ [2]
(b) An apple on a tree fell down to the ground below.
i.
What would be the acceleration of the apple?
_____________________________ [1]
ii.
State the initial velocity of the apple .
_____________________________[1]
iii.
Calculate the final velocity with which it hits the ground if it takes 0.9s to hit the ground.
_______________________________________________________________________ [2]
iv.
Calculate the height of the apple above the ground?
_______________________________________________________________________
Physics – Form 4 Secondary – Track 2 – 2016
[3]
Page 7 of 8
8. Jeremy was investigating the
acceleration of free fall using a
falling card and a data logger.
a) Label the apparatus in
the adjacent diagram .[3]
b) An important piece of
apparatus is missing in
the above setup. What is
it?
________________[1]
c) Describe briefly how
Jeremy should carry out this experiment by writing the following steps in order.
[4]
Read time taken
Repeat experiment using different distances
Measure distance between light gates
Drop card.
4
Record results in a table
d) Name one precaution that needs to be taken
_______________________________________________________________________[2]
e)
What two measurements must Jeremy take to find the acceleration of freefall?
_____________________________________________________________________
[2]
f) How can Jeremy present his results?
_____________________________________________________________________
[1]
d) In one experiment when the card was dropped from a height of 0.8 m the time recorded by the
data logger was found to be 0.39 s. Calculate the value for the acceleration due to gravity
obtained by Jeremy. (Use s = ½ g t2)
_______________________________________________________________________
_______________________________________________________________________[2]
Page 8 of 8
Physics – Form 4 Secondary – Track 2 – 2016