Download S.6 Phy revision Quiz 1

STCC
S.6 Quiz
Optics, Sound and water waves
Total :50 marks
1. A light ray is entering an air bubble inside
water as shown on the right. Which path
best represents the emerging ray?
A Path 1
B Path 2
C Path 3
D Path 4
2. Which of the following effects result(s) from total internal reflection?
(1) Mirage
(2) Transmission of signals in optical fibre
(3) Sparkle of diamonds
A (1) only
B
(1) and (2) only
C (2) and (3) only
D
(1), (2) and (3)
3. Which of the following must be a property of a real image formed by a lens?
A It is erect.
B It is of the same size as the object.
C It can be captured on a screen.
D It is as far behind the lens as the object is in front.
4. An object O is initially placed 30 cm in front of a convex lens of focal length 25 cm as shown below.
Then the object is moved 10 cm closer to the lens. Which of the following statements best describes the
image?
A The image becomes infinitely large.
B The image changes from inverted to erect.
C The image changes from virtual to real.
D The image forms on the opposite side of the lens to the object.
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5. An object is placed in front of a concave lens and an image is formed.
The image must be ____________, ____________ and ____________.
6. Dispersion occurs when white light passes through a prism.
This is because
A different colours of light are reflected at different angles.
B different colours of light are absorbed in the prism by different amounts.
C different colours of light travel at different speeds in the prism.
D some colours of light do not obey Snell’s law.
7. Which of the following electromagnetic wave is/are used in medical imaging?
(1) Microwave
(2) X-rays
(3) Gamma rays
A (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
8. The refractive index of diamond is 2.42. What is the speed of light in diamond?
A 5.8  107 m s1
B 1.24  108 m s1
C 3  108 m s1
D 7.26  108 m s1
9. A light ray passes from medium X to medium Y. The angle of incidence is 32.1 and the angle of
refraction is 64.2. Which of the following is the critical angle for this interface?
A 36.2
B 45
C 57.9
D None of the above
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10. Which of the following electromagnetic waves is used to detect fake banknotes?
A Infra-red radiation
B Ultra-violet radiation
C X-ray
D Gamma ray
11. In the figure below, ABCD represents a rectangular glass block placed in the water of a ripple tank to
form a shallow region. A series of straight water waves travels towards AB.
Which of the following diagrams best shows the subsequent wave pattern?
A
B
C
D
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12. If a sound is placed underwater, which of the following correctly shows how the travelling direction of
the sound waves changes at the water surface?
A
B
C
D
13. Which of the following statements about sound is/are correct?
(1) Loudness is measured in decibels (dB).
(2) When the sound intensity level is zero, the amplitude of the sound wave is zero.
(3) Constant exposure to loud noise can cause loss of hearing.
A (1) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
14. The figure below shows the traces on a CRO of four notes produced by different musical instruments.
(Note: The settings of the CRO the same in each case.)
Which pair of traces represents notes of approximately the same pitch?
A (1) and (3)
B (1) and (4)
C (2) and (3)
D (2) and (4)
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15. In the following figure, a plane wave travels towards two narrow gaps and circular waves come out
from the gaps. P is 15 cm away from S1 and 20 cm away from S2, while Q is 14 cm away from S1 and 12 cm
away from S2.
If the wavelength of the wave is 2 cm, what kind of interference will occur at P and Q?
P
Q
A
B
C
Constructive
Constructive
Destructive
Constructive
Destructive
Constructive
D
Destructive
Destructive
16. (Learning target 2-4) Dippers, S1 and S2, produce circular wavefronts in a ripple tank. Which of the
following statements is/are correct?
Z
Y
S1
(1)
(2)
(3)
A
C
X
S2
Constructive interference occurs at X, Y and Z.
Amplitude of the wave at Y is always zero.
More nodal and antinodal lines can be observed when the frequency of the dippers increases.
(1) only
B (3) only
(2) and (3) only
D
(1), (2) and (3)
17. When water waves travel from a shallow region to a deep region, which of the following physical
quantities of the wave would increase?
(1) Frequency
(2) Wavelength
(3) Wave speed
A (1) and (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
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18. Ivan wants to produce a spectrum of white light using a 459045 prism. He directs a ray of white
light at side AB of the glass prism as shown below.
The refractive index of the prism is 1.5. Will total internal reflection occur at P? Explain briefly. (3marks)
19. An illuminated letter ‘F’ is placed in front of a lens as shown in Figure a. Figure b shows what the
observer sees.
Fig a
(a) Is the lens concave or convex?
Fig b
(1 mark)
(b) Draw a ray diagram in Figure c to show how the image of the letter ‘F’ is formed. (3 marks)
20. A longitudinal wave passes through a medium containing a series of particles. In the following figure,
the positions of these particles at a certain moment t are shown. The dotted lines are the equilibrium
positions of these particles.
(a) Fill in the blanks below to complete the descriptions.
(3 marks)
(i) Particle 5 is at the centre of ____________________.
(ii) The amplitude of the wave is ____________________.
(iii) The wavelength of the wave is ____________________.
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21. An object is placed d cm away from a lens of focal length 12 cm. An image is formed on the same side
as the object and is
d
cm away from the lens. Find d using the lens formula.
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(3 marks)
22.
Kenny uses a magnifying glass to study a plant.
(a) Is the magnifying glass a convex lens or concave lens?
(1 mark)
(b) He puts the magnifying glass 5 cm away from a flower. The image of the flower is erect and 3 times
its original size.
(i) How far is the image away from the lens?
(2 marks)
(ii) Use the lens formula to find the focal length of the lens.
(2 marks)
23. In the figure, two loudspeakers, A and B, are connected to the same signal generator which is set to give
sound waves with a wavelength of 0.4 m. Initially, only A is switched on.
If B is also switched on, what happens to the loudness of the sound heard at point P? Explain briefly. (3
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24. The figure shows an interference pattern.
X
S1
S2
If the wavelength of the waves is 2 cm, what is the path difference at X? Hence, determine the type of
interference at X.
(3 marks)
25. A continuous straight water wave is approaching a straight barrier at an angle as shown below.
(a) In the above figure, draw how the incident wavefronts are reflected by the barrier. (Draw the
reflected wavefronts and their direction of travel.)
(2 marks)
(b) The straight barrier is then replaced by two slits as shown below.
In the figure above, draw the pattern of the water waves after they pass through the slits. Draw the
nodal and antinodal lines as well.
(2 marks)
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