# 中三 物理試卷 (F3 Physics Past Paper)

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F3 Physics Uniform Test

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## 中三物理試卷 PDF 下載

Instructions:
Test 2021 2022
S.3 Physics
Time Allowed: 30 minutes
Total Mark: 30
1. This paper consists of TWO sections (Sections A and B) and a bonus question. You must attempt ALL
questions in sections A and B. The bonus question is optional.
2. You should use an HB pencil to mark all your answers of Section A on the MC Answer Sheet. Wrong
marks must be completely erased with a clean rubber. You should mark only ONE answer for each
question. If you mark more than one answer, you will receive NO MARKS for that question.
3. Write your answers of Section B in the spaces provided. Unless otherwise specified, all working must
be clearly shown.
-------- ----
4. Unless otherwise specified, numerical answers should be either exact or correct to 3 significant
Bonus Question
S3 Physics Uniform Test (2021-22)
1. (a) straight
Multiple Choice (12 marks)
Incident ray
Reflected ray
Solutions and Marking Scheme
Let x m be the distance between Karen and the mirror,
x + x +0.2=2.4
Thus, the distance between Karen and the mirror is 1.1 m.
Erect/ Laterally inverted/ Same size as the object/ Image distance equals object distance/
(1, without unit - 0.5)
white light
(b) Dispersion.
4. (a) Towards the normal.
(b) The larger the refractive index, the larger the degree of bending.
(ii) Refraction of light.
violet light
Bonus question (3 marks)
(a) Let the speed of light travelling in Perspex be v₁, by
1.49 = ( 3 x 108 )/V₁
V₁ = 2.01 x 108
→ Speed of light travelling in Perspex is 2.01 x 108 ms ¹¹.
Let the speed of light travelling in glass be v2, by
1.6 = (3 x 10³ )/V2
V₁ 1.88 x 108
→Speed of light travelling in Perspex is 1.88 x 10³ ms ¹.
(b) Difference of speed of light travelling in Perspex and glass
= 2.01 x 108 - 1.88 x 108
= 0.13 x 10³ ms ¹.
Section A (12 marks): Multiple Choice Questions
1. Which of the following is/are example(s) for luminous objects?
(1) Shooting star
(2) Glowworm
(3) The Moon
A. (1) only
B. (2) only
C. (1) and (2) only
D. (1), (2) and (3)
In the diagram above, the window of a classroom forms an image of the classroom. Which of the
following is correct?
A. Light cannot pass through the window.
B. All the light is absorbed by the window
C. All the light is reflected by the window.
D. Some of the light is reflected by the window.
The incident ray and the final reflected ray are parallel to each other. Find the angle between the
two plane mirrors
D. Cannot be determined
A light ray is reflected by a plane mirror. The angle between the incident ray and the reflected ray
is 90°. If the angle of incidence is now decreases by 10°, what is the new angle of reflection?
Which of the following is NOT an application of reflection of light?
A. Formation of rainbow.
B. Periscope.
C. Kaleidoscope.
D. Daylighting.
Which of the following regarding regular and diffuse reflection is correct?
A. Under regular reflection, parallel incident rays will reflect into diverging rel
B. Regular reflection allows us to see clear image from all directions.
C. When we shine light on a rock, diffuse reflection will occur.
D. Roughness of the surface increases with the brightness of reflected
Different electromagnetic waves
A. have the same wavelength.
B. have the same speed in vacuum.
C. are refracted to the same extent by a prism.
D. are all visible by human eyes.
Which of the following coloured light has shorter wavelength than yellow light?
(1) Red light
(2) Green light
(3) Violet light
A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only
The figure below shows a light ray passing through air, and media X and Y.
Which of the following statements about the refractive indices of media X and Y is correct?
A. Medium X has a larger refractive index than medium Y.
B. Medium X has a smaller refractive index than medium Y.
C. Medium X has the same refractive index than medium Y.
D. Cannot be determined because there are three media (including air) in the above figure.
*** 10. A light ray is travelling from air into an unknown transparent material X.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Which of the following statements about the light ray at the boundary between air and material X
must be correct?
(1) The larger the refractive index of material X, the more the light ray bends at the boundary.
(2) Both refraction and reflection occur at the boundary.
(3) The light ray bends towards the normal.
** 11. A light ray emerges from a rectangular glass block after passing through it as shown below. Which of
the following rays is possibly the incident ray on the glass block?
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
12. Which of the following statements are correct when light travels from air to glass?
(1) Some of the light is reflected at the air-glass boundary.
(2) Some of the light enters the glass and changes its direction.
(3) The refracted ray appears dimmer than the incident ray.
emergent ray
End of Section A
Section B (18 marks): Conventional Questions.
*1. Fill in the blanks with one word.
A light ray is a very narrow light travelling in a (a)
2. As shown below, Karen is doing an eye test. She is seeing some symbols printed on the test chart in
the plane mirror.
plane mirror
diagram to show the direction of light rays.
(a) In the above diagram, draw and label TWO light rays to show how Karen sees the symbols
printed on the test chart in the plane mirror.
* (c) State one nature of the symbols that Karen sees in the mirror.
what Karen sees
line. We can draw a
The symbols that Karen sees in the mirror are shown below. In the box on the right, draw how
the symbols are printed on the test chart.
on the test chart
In the eye test, the symbols are 2.4m away as seen by Karen's eyes. Calculate the distance
between Karen and the mirror.
3. A ray of white light is travelling towards a prism as shown below.
4. A light ray is travelling from vacuum into a medium.
white light
Complete the above ray diagram to show how the white light is refracted inside the prism.
Indicate the red light ray and violet light ray clearly.
Name the phenomenon of (a) where white light is separated into a range of different colour of
To which direction does the light ray bend on entering this medium?
Describe how the refractive index of a medium affects the degree of bending.
5. In the experiment below, a light ray is travelling through a triangular prism PQR in air that is made of
Perspex. The light ray will leave the prism at side PR.
(Given that the refractive index of Perspex is 1.49.)
(a) (i) Complete the above ray diagram until the light ray emerges from the prism.
(ii) Name the phenomenon that occurs at the surface of the prism.
End of Section B -
*** (b) The experiment is repeated with a glass prism with the same dimensions as the above prism. In the
above diagram, sketch the new light rays and label them as 'G'. Assume that the ray will leave the
prism at side PR.
(Given that the refractive index of the glass is 1.6)
Bonus question (3 marks):
Given that the speed of light is 3 x 108 ms ¹¹.
*** (a) Calculate the speed of light travelling in Perspex and glass in Question 5.
** (b) Hence, calculate the difference of speed of light travelling in Perspex and glass in Question 5.
End of Bonus Question
End of Paper