HKCEE 1999 - 2003
PHYSICS - MC Questions
Waves
(1999-CE-PHY II - 20)
20. A cork in the water vibrates up and down 4 times in 2 s when a wave passes
through it. The distance between two successive crests of the wave is 10 cm.
Find the speed of the water wave.
A.
B.
C.
D.
E.
0.05 m s-1
0.1 m s-1
0.2 m s-1
0.4 m s-1
0.8 m s-1
(1999-CE-PHY II - 21)
21.
The above diagram shows a transverse wave traveling along a string. At the
instant shown, particle P is moving upwards. Which of the following
statements is incorrect ?
A.
B.
C.
D.
E.
The wave is traveling towards the left.
Particles P and Q vibrate with the same amplitude.
Particles P and Q vibrate with the same frequency.
Particle Q is moving downwards at this instant.
Particle R is at rest at this instant.
1
(1999-CE-PHY II - 22)
22.
A series of straight water waves travels towards the right in a ripple tank as
shown above. In order to obtain the waves as shown in the right hand side,
what kinds of phenomenon have the straight waves undergone ?
A.
B.
C.
D.
E.
reflection only
refraction only
diffraction only
refraction and diffraction only
diffraction and interference only
(1999-CE-PHY II - 23)
23 A plane water wave travels from a deep region to a shallow region of water.
If the wavelength, frequency and speed of the wave in the deep region are
λ1, f1 and v1 respectively, while the corresponding values in the shallow
region areλ2 , f2 and v2 respectively. Which of the following relations is/are
correct ?
(1) λ1 >λ2
(2) v1 > v2
(3) f1 > f2
A.
B.
C.
D.
E.
(1) only
(3) only
(1) and (2) only
(2) and (3) only
(1), (2) and (3)
2
(1999-CE-PHY II - 24)
24. Which of the following equipment emit(s) waves which are electromagnetic
in nature ?
(1)
(2)
(3)
a television remote control
a microwave oven
an ultrasonic scanner for examining fetuses (babies not yet born)
A.
B.
C.
D.
E.
(1) only
(3) only
(1) and (2) only
(2) and (3) only
(1), (2) and (3)
(1999-CE-PHY II - 25)
25. Which of the following statements about light and sound is/are correct ?
(1)
(2)
(3)
Both light and sound are transverse waves.
Both light and sound travel faster in air than in water.
Both light and sound can undergo refraction when traveling from one
medium to another.
A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only
E. (1), (2) and (3)
(2000-CE-PHY II - 24)
24. Which of the following statements correctly describe(s) the meaning of the
frequency of a wave ?
(1) the time taken for the wave to make one complete vibration
(2) the distance travelled by the wave in one second
(3) the number of waves produced in one second
A. (1) only
B. (3) only
C. (1) and (2) only
3
D. (2) and (3) only
E. (1), (2) and (3)
(2000-CE-PHY II - 25)
25. Scientists have discovered that ozone molecules in the earth’s atmosphere
are being destroyed. Which of the following electromagnetic waves is
mainly responsible for causing hazard to human health as a result of the
damaging of the ozone layer?
A.
B.
C.
D.
E.
gamma radiation
visible light
infra-red
microwaves
ultra-violet
(2000-CE-PHY II - 26)
26. A water wave of frequency 30 Hz travels in a deep region of water. When
the wave enters a shallow region, its wavelength is reduced to one-third of
its original value. Find the frequency of the water wave in the shallow
region.
A.
B.
C.
D.
E.
10 Hz
30 Hz
60 Hz
90 Hz
It cannot be determined since the speed of the water wave is not
given.
(2000-CE-PHY II - 27)
27.
A straight pulse PQ travels towards a V-shaped barrier in ripple tank as
shown above. Which of the following diagrams best shows the reflected
4
pulse(s) ?
A.
B.
C.
D.
E.
(2000-CE-PHY II - 28)
28.
A microphone and a CRO are used to detect the sound emitted by two
tuning forks X and Y in turn. The figure above shows the traces obtained,
with the setting of the CRO unchanged. Find the ratio of the frequency of
the sounds emitted by X to that of Y.
A.
B.
C.
D.
E.
1:2
2:1
2:3
4:5
5:4
5
(2001-CE-PHY II - 22)
22. Which of the following is not a transverse wave ?
A.
B.
C.
D.
E.
radio waves
visible light
ultra-violet
X-rays
ultrasonic waves
(2001-CE-PHY II - 23)
23.
Five corks are moving up and down on the surface of a pond as a water
wave passes through them. At time t = 0, the positions of the corks are
shown above. The figure below shows the displacement-time graph of
one of the five corks. Which cork has the motion represented by the
graph ?
(Note : Displacement is positive when the cork is above the still water
surface.)
A.
B.
C.
D.
E.
P
Q
R
S
T
(2001-CE-PHY II - 24)
6
24. A sonar on a ship is used to find the depth of the sea. An ultrasonic wave
pulse is sent downwards from the ship towards the sea bed. The pulse travels
with a speed of 1500 m s-1 in sea water. If the reflected pulse is received
after 0.16 s, find the depth of the sea.
A.
B.
C.
D.
E.
120 m
240 m
480 m
4688 m
9375 m
(2001-CE-PHY II - 25)
25.
In the above diagram, XY represents a boundary between a deep region and a
shallow region of water in a ripple tank. A serried of straight water waves in
the deep region travels towards XY. Which of the following diagrams best
shows the wave pattern in the shallow region ?
7
(2001-CE-PHY II - 26)
26.
Water waves
of wavelength λ
are
diffracted as they pass through a gap of width d as shown above. Which of
the following changes would produce the most significant diffraction
effect ?
λ
A.
B.
C.
D.
E.
remains unchanged
remains unchanged
halved
halved
halved
8
d
halved
doubled
halved
remains unchanged
doubled
(2002-CE-PHY II - 24)
24. In a ripple tank experiment, a series of water waves travels towards a barrier.
Which of the following quantities would remain unchanged after the waves
are reflected by the barrier?
(1)
wavelength
(2)
frequency
(3)
speed
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
(2002-CE-PHY II - 25)
25. A wave source generates waves of frequency 50 Hz. How long does it take for
the waves to travel 100 m?
A. 0.5 s
B. 2 s
C. 5000 s
D. It cannot be determined as insufficient information is given.
(2002-CE-PHY II - 26)
26.
9
Which of the following phenomena would be observed when the water waves
pass through the opening in the above set-up?
A. reflection
B. refraction
C. diffraction
D. interference
(2002-CE-PHY II - 27)
27. Which of the following is/are the reason(s) for not over-using ultra-violet
lamps to produce a suntan effect?
(1) Ultra-violet radiation is highly penetrating and will damage body tissue.
(2) Ultra-violet radiation has a strong heating effect and will damage body
tissue.
(3) Over exposure to ultra-violet radiation may cause skin cancer.
A. (2) only
B. (3) only
C. (1) and (2) only
D. (1) and (3) only
(2002-CE-PHY II - 28)
28.
10
The figure above shows the image of a fetus (a baby not yet born) taken by a
scanner. Which of the following waves should be used in the scanning
process?
A. infra-red
B. microwaves
C. ultrasonics
D. X-rays
(2002-CE-PHY II - 29)
29.
The above figures show the CRO displays of two musical notes X and Y. The
settings of the CRO for displaying the two notes are identical. Which of the
following statements are correct?
(1)
Notes X and Y are of different qualities.
(2)
Notes X is of a higher pitch than note Y.
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(3)
Notes X is louder than note Y.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3)
D. (1), (2) and (3)
12
(2003-CE-PHY II - 25)
25 Which of the following statements about the transverse wave are correct?
(1) Its wavelength is 20 cm.
(2) Its frequency is 6 Hz.
(3) Its amplitude is 6 cm.
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
(2003-CE-PHY II - 26)
26 Which of the following diagram shows the shape of the string at a quarter of
a period later?
13
(2003-CE-PHY II - 27)
27
Plane water waves travel towards an L-shaped barrier in a ripple tank as
shown above. Which of the following diagram best shows the reflected wave
pattern?
14
28 (2003-CE-PHY II - 28)
Plane water waves travel from a deep region to a shallow region of water
through a narrow gap as shown above. Which of the following properties of
the waves remains unchanged?
A.
B.
C.
D.
Direction of travel
Speed
Wavelength
Frequency
29 (2003-CE-PHY II - 29)
15
A ringing electric bell is placed inside a glass jar as shown above. As air is
pumped out of the jar, the sound will die away. Which of the following can
explain this phenomenon?
A.
B.
C.
D.
The hammer of the bell cannot vibrate in a vacuum.
Sound waves are internally reflected by the glass surface.
Sound waves cannot travel in a vacuum.
The frequency of sound waves in a vacuum exceeds the audible
frequency range.
30 (2003-CE-PHY II - 30)
The photograph shows a digital video camera recorder. The recorder has a
nightshot function for capturing images in the dark. Which of the following
electromagnetic waves is employed by the recorder in capturing images in
the dark?
A.
B.
C.
D.
Radio waves
Infra-red
Ultra-violet
X-rays
16