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S3 Dec Exam 2015

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Shun Lee Catholic Secondary School
First Examination (2015-2016)
Question-Answer Book
Level : Secondary 3
Name : ___________________ S 3 ____ ( )
Subject : Science (Physics)
Score
Time allowed : 30 minutes
Full mark : 30 marks
/ 30
Instructions – Please read carefully before the examination starts.
1.
When told to open this paper, you should check that all the questions are there. Look
for the words ‘END OF PAPER’ after the last question.
2.
After the announcement of the start of the examination, you should first write your
name, class and class number in the space provided on this page. All information
should be included. Otherwise, mark(s) will be deducted.
3.
This paper must be answered in English.
4.
This paper consists of TWO sections, Section A and Section B. Section A (Multiple
Choice Questions) carries 10 marks and Section B (Short Questions) carries 20 marks.
5.
Answer ALL questions in each section. Write your answers in the spaces provided in
this Question-Answer Book.
Page 1 of 9
Section A
1.
Multiple Choice Questions (1 mark each)
The nearest star Proxima Centauri is 4.3 light years from us. Given the speed of light is 3  108
ms-1, find the distance of Proxima Centauri from the Earth in metres (m).
A.
B.
C.
D.
1.44  1011 m
9.46  1015 m
4.07  1016 m <ANS>
1.33  1019 m
ANS: _______
2.
The wavelength of visible light, from red light to violet light, ranges from
A. 400 nm to 700 nm. <ANS>
B. 700 nm to 1400 nm.
C. 100 nm to 400 nm.
D. 1000 nm to 1400 nm.
ANS: _______
3.
Susan and Peter stand in front of a big mirror at different distances as shown. How far away is
the image of Peter from Susan?
2m
4m
A.
B.
C.
D.
2m
4m
6m <ANS>
8m
ANS: _______
Page 2 of 9
4.
Susan sees the image of a wall picture behind her through the mirror. The image is formed 12m
away from her as shown. If the height of the picture is 5m, estimate is the MINIMUM length of
the mirror so that she can see the whole image of the picture?
12 m
5m
Mirror
4m
A.
B.
C.
D.
Image of picture
behind Susan
0.42 m
1.67 m <ANS>
2.5 m
5m
ANS: _______
5.
Which of the following may form a clear image?
(1) Diffuse reflection
(2) Refraction by a tank of water
(3) Refraction by convex lens
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only <ANS>
ANS: _______
6.
Which of the following descriptions about the refraction of light when light travels from glass to
air is INCORRECT?
A. Light travels faster in glass. <ANS>
B. The light ray bends away from normal.
C. The refracted angle may equal 90.
D. Total internal reflection may occur when incident angle is large enough.
ANS: _______
Page 3 of 9
7.
AIR
Refer to the figure on the right, calculate the
refractive index of the glass block.
A.
B.
C.
D.
40
0.653
0.742
1.35
1.53 <ANS>
60
GLASS
ANS: _______
8.
Calculate the critical angle of diamond (i.e. diamond-air interface). Given that the refractive
index of diamond is 2.42.
A.
23.7
B.
24.4 <ANS>
C.
65.6
D.
22.5
ANS: _______
9.
Which of the following is/are advantage(s) of using MIRRORS to construct a periscope instead of
using PRISMS?
(1) the image is brighter
(2) the image is sharper
(3) the periscope is lighter
(4) the periscope is cheaper
A.
(1) and (2) only
B.
(3) and (4) only <ANS>
C.
(1) and (3) only
D.
(2) and (4) only
ANS: _______
Page 4 of 9
10. Which of the followings are applications of total internal reflection ?
(1) optical fibre
(2) mirage
(3) rainbow
A. (1) and (2) only
B. (2) and (3) only
C. (1) and (3) only
D. (1), (2) and (3) <ANS>
ANS: _______
Short Questions:
11.
Draw the image of the following objects formed by a plane mirror. (2 marks)
(a)
(b)
Page 5 of 9
12.
To anyone on the ground, a swimming pool looks shallower than it really is. Complete the
following ray diagram to explain. Hint: You should label the image of the bottom of the pool
in your diagram. (2 marks)
A pool of water
13.
A stick looks bent due to light refraction when partly immersed in water as shown.
Complete a ray diagram below to explain why it happens. (3 marks)
A stick partly immersed in water
Page 6 of 9
14.
A semi-circular glass block and a semi-circular water tank are placed side by side as shown
below. What are the angles of incidence and angle of refraction ? (2 marks)
Angle in water: ________________
Angle in glass: _________________
Semi-circular
water tank
Semi-circular
glass block
15.
Refer to the last question. Calculate the refractive index of the glass block. Given refractive
index of water water = 1.33.
(2 marks)
Page 7 of 9
16.
Refer to the Question 14 again. If the incident angle further increases, what would happen
to the brightness of refracted ray? What about the brightness of reflected ray? (2 marks)
17.
A periscope is constructed using mirrors as shown. Draw the two marked light rays from the
object to the observer eye. (1 mark)
Object
Fig. 17
18.
Fig.18
In Fig.18, draw two prisms to form a periscope. (1 mark)
Page 8 of 9
19.
A real image is formed by a convex lens of focal length 4 cm. The object is placed 10 cm
from the lens. Complete the ray diagram below and locate and label the image. (3 marks)
20.
For the image formed in Q19 above, what is the nature and magnification of the image?
(2 marks)
-
END -
GOOD LUCK !
Page 9 of 9
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