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St. Joseph’s Anglo-Chinese School

First Term Examination 2008/2009 Form 4 Physics Paper 2

Time allowed: 1 hour

There are 27 questions in Section A and 18 questions in Section B.

Answer all questions.

Section A

1. The following figure shows a traveling wave.

Which particle has the same amplitude as P?

A Q

B R

C S

D Q, R and S

2. Which of the following statements about a transverse wave is/are correct?

(1) It consists of troughs and crests.

(2) All particles within one wavelength have the same frequency.

(3) All particles within one wavelength vibrate in phase.

A (1) only

B (2) only

C (1) and (2) only

D (2) and (3) only

3. The frequency of a wave is 3 Hz. How many waves can be produced in 2 s?

A 0.67

B 1.5

C 3

D 6

4. A travelling longitudinal wave is generated along a slinky spring at a frequency of

5 Hz. The figure below shows the wave at a certain time instant.

What is the speed of the wave?

A 1.25 m s−1

B 2.5 m s−1

C 5 m s−1

D 10 m s−1

S •

Q

R

•

• •

P

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5. The speed of a wave is affected by

A the properties of the medium through which the wave travels.

B the wavelength of the wave.

C the frequency of the wave.

D both the amplitude and frequency of the wave.

6. When a series of water waves travels from one medium to another, which of the

following wave properties will change?

(1) Frequency

(2) Speed

(3) Wavelength

A (1) only

B (2) only

C (2) and (3) only

D (1), (2) and (3)

7. Which of the following electromagnetic waves is most damaging to human tissues?

A X-ray

B Ultra-violet

C gamma ray

D microwaves

8. In a ripple tank, when water waves pass through a narrow gap in a barrier, what

happens to its frequency and wavelength?

Frequency Wavelength

A. increases increases

B. increases decreases

C. decreases remains unchanged

D. remains unchanged remains unchanged

9. A typical microwave oven produces a microwave of frequency 10 GHz. What is

its wavelength?

(It is given that 1 G Hz = 109 Hz and the speed of light in air = 3 × 10

8 ms

-1.)

A. 3.3 × 10−1 m

B. 3.0 × 10−2 m

C. 3.0 × 10−8 m

D. 3.3 × 10−10

m

10. Some letters are viewed by a lens. The image of the letters is shown in the

following figure.

Which of the following statements is/are correct?

(1) The letters are located within one focal length from the lens.

(2) The image is virtual.

(3) The lens is a convex lens.

A (1) only

B (3) only

C (1) and (2) only

D (1), (2) and (3)

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11. Which of the following statements about electromagnetic waves is/are correct?

(1) The speeds of electromagnetic waves are equal to the speed of light.

(2) All kinds of electromagnetic wave can travel in a vacuum.

(3) Electromagnetic waves are transverse waves.

A (1) only

B (2) only

C (1) and (3) only

D (1), (2) and (3)

12. Arrange the following electromagnetic waves in ascending order of frequency.

I Infra-red II Ultra-violet

III Visible light IV Radio waves

A Infra-red, Visible light, Ultra-violet, Radio waves

B Ultra-violet, Infra-red, Visible light, Radio waves

C Radio waves, Infra-red, Visible light, Ultra-violet

D Infra-red, Visible light, Radio waves, Ultra-violet

13. The spreading of a wave into a region behind an obstacle is known as

A interference.

B diffraction.

C diffusion.

D dispersion.

14. In the figure below, what is the angle of reflection on mirror M2?

M2

M1 30 100°

A 40°

B 45°

C 50°

D 55°

15. Which of the following statements about wave is incorrect?

A A water wave transfers energy.

B A water wave cannot change its direction of propagation after it is produced.

C A water wave travels at a constant speed when the depth of the water remains

unchanged.

D A water wave is an example of transverse wave.

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16. In the figure, a series of plane water waves travels towards a barrier.

Which of the following shows the correct reflected wave?

A

B

C

D

17. Which of the following is a luminous object?

(1) Candle flame.

(2) The sun.

(3) The moon.

A (1) and (2) only

B (2) and (3) only

C (1) and (3) only

D (1), (2) and (3)

18. As shown in the figure below, a letter 'P' is placed in front of a plane mirror.

Which of the following correctly shows the image of the letter 'P' formed by the

plane mirror?

A

B

C

D

19. Which of the following statements about sound waves is correct?

A. The travel of sound waves is not affected by the medium through which it

travels.

B. Sound waves travel faster in air than in liquid.

C. Sound waves travel faster in solid than in air.

D. Sound waves cannot travel through a solid.

50°

50°

140°

°

130° 40°

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20. A ray of light passes through an air-glass boundary as shown below.

If the refractive index of glass is 1.5, find r.

A 23 o

B 28 o

C 33 o

D 37 o

21.

When parallel rays of light are incident on an irregular surface as shown in the

figure, which phenomenon of light occurs?

A Refraction

B Diffraction

C Regular reflection

D Diffuse reflection

22. A boy sees lightning at the sky and he hears the sound 3 s later. If the speed of

sound in the air is 340 m s−1, how far away is he from the thunderstorm?

A 510 m

B 1020 m

C 2040 m

D 2550 m

23. Which of the following about audible frequency range is correct?

(1) Audible frequency range is the same for all persons.

(2) Audible frequency range decreases with age.

(3) Audible frequency range is from about 20 Hz to 20 000 Hz.

A (1) only

B (3) only

C (1) and (3) only

D (2) and (3) only

24. What is its apparent position of the goldfish to the observer in the following figure?

r

54o

glass

air

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25. Which of the following MUST be a property of a virtual image?

A It is magnified.

B It is of the same size as the object.

C It cannot be picked up by a screen.

D It is as far behind the mirror/lens as the object is in front.

Directions: Each question below (Question 26 – 27) consists of two statements. Decide

whether each of the two statements is true or false. If both are true, then

decide whether or not the second statement is a correct explanation of the

first statement. Then select option A, B, C, or D according to the following

table:

1st statement 2nd statement

A True True The 2nd statement is a correct

explanation of the 1st statement

B True True The 2nd statement is not a correct

explanation of the 1st statement.

C True False

D False True

1st statement 2nd statement

26. At a point of constructive

interference of two waves, a

crest is always formed.

At a point of constructive

interference of two waves,

the amplitude of vibration

increases.

1st statement 2nd statement

27. In a longitudinal wave,

particles vibrate along the

direction of travel of the

wave.

Longitudinal waves travel

slower than transverse waves.

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Section B

(For Questions 28 and 29) The displacement-distance graphs of the particles along a

traveling wave at time t = 0 and t = 0.2 s are shown below.

28. Which of the following statements about the wave are correct?

(1) Its amplitude is 6 cm.

(2) Its wavelength is 4 cm.

(3) Its frequency is 3.75 Hz.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2), and (3)

29. What is the speed of the wave?

A -1s m 2.0

B -1s m 3.0

C -1s m 4.0

D -1s m 8.0

30. Which of the following nature of light can be demonstrated by Young’s double-

slit experiment?

(1) Light is a wave.

(2) Light is a particle.

(3) Light is a transverse wave.

A (1) only

B (2) only

C (1) and (3) only

D (1), (2) and (3) only

2 cm

2 cm

Distance

Displacement at t = 0.2 s

0

2 cm

2 cm

Distance

Displacement at t = 0

0

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Question 31 – 32

Two parallel rays from a distant object are refracted through a spherical lens as shown.

31. Which of the following statements are correct?

(1) The image is erect.

(2) The image is virtual.

(3) The lens is concave.

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)

32. The focal length of the lens is

A 10 cm

B 13 cm

C 26 cm

D 40 cm

33. Two dippers, S1 and S2, are connected to the same vibrator and produce identical

waves in a ripple tank. It is known that the wavelength of the waves is 2 cm.

What is the path difference of Y? Hence, determine the type of interference at Y.

Path difference Type of interference

A 3 cm Constructive

B 3 cm Destructive

C 6 cm Constructive

D 6 cm Destructive

34. Which of the following is/are longitudinal waves?

(1) Ultrasonics transmitted through air.

(2) Infrared transmitted through water.

(3) Gamma rays transmitted through outer space.

A. (1) only

B. (3) only

C. (1) and (2) only

D. (2) and (3) only

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35. The coherent light sources emit light of

(1) the same frequency.

(2) the same amplitude.

(3) a constant phase difference.

A. (1) only

B. (2) only

C. (1) and (3) only

D. (1), (2) and (3)

36. Which of the following statements concerning visible light and microwaves is/are

correct?

(1) Visible light is electromagnetic wave while microwaves are not.

(2) Visible light and microwaves travel with the same speed in air.

(3) Visible light can be diffracted while microwaves cannot.

A (1) only

B (2) only

C (2) and (3) only

D (1), (2) and (3)

37. According to the figure, which of the following about the image is correct?

Magnification Image nature

A 0.5 real

B 0.5 virtual

C 2 real

D 2 virtual

38. Which of the following is / are example(s) of total internal reflection?

(1) fish-eye view

(2) bending of chopstick in water

(3) optical fibre

A (1) only

B (3) only

C (1) and (2) only

D (1) and (3) only

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39. The following diagrams shows a light ray hitting a semicircular glass block in

different ways. C is the center of the semicircular block. Which diagram(s) is/are

correct? (Take critical angle of glass = 42o.)

(1)

(2)

(3)

A (2) only

B (1) and (2) only

C (1) and (3) only

D (1), (2) and (3)

40. A light ray passes through a triangular prism as shown in the following figure.

What is angle θ? (Take refractive index of glass = 1.5.)

A 51°

B 53°

C 61°

D 65°

41. Two sound waves A and B are shown on the CRO screen. Which of the following

statements is/are correct?

(1) A is quieter than B.

(2) A has a higher pitch than B.

(3) A has a better quality than B.

A (1) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)

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medium 1

medium 2

medium 3 parallel

boundaries

42. Which of the following about noise is INCORRECT?

A Noises above 140 dB causes permanent damage to the ear.

B Noises at 130 dB can produce ear pain.

C 0 dB means no sound.

D Sound intensity level meters can be used to measure sound intensity levels.

43. A ray of light travels from medium 1 to medium 2 and is totally reflected at the

boundary between media 2 and 3 as shown. Which of the following statements

is/are correct?

(1) Medium 2 has the largest refractive index.

(2) The ray will be totally reflected again at the boundary between medium 1

and 2.

(3). Medium 3 has a larger refractive index than medium 1.

A. (1) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2) and (3)

44. Dippers, S1 and S2, produce circular wavefronts in a ripple tank. Which of the

following is/are correct?

(1) Constructive interference occurs at X and Z.

(2) Amplitude of Y is always zero.

(3) More nodal and antinodal lines can be observed when the frequency of the

dippers increases.

A (1) only

B (3) only

C (2) and (3) only

D (1), (2) and (3)

Directions: Each question below (Question 45) consists of two statements. Decide

whether each of the two statements is true or false. If both are true, then decide whether

or not the second statement is a correct explanation of the first statement. Then select

option A, B, C, or D according to the following table:

1st statement 2nd statement

A True True The 2nd statement is a correct

explanation of the 1st statement

B True True The 2nd statement is not a correct

explanation of the 1st statement.

C True False

D False True

1st statement 2nd statement

45 Visible light is a wave.

Visible light can travel

through a vacuum.

--- End of Paper ---

X

S1 S2

Y

Z

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Answers

1.D 6.C 11.D 16.C 21.D 26.D 31.D 36.B 41.A

2.C 7.C 12.C 17.A 22.B 27.C 32.B 37.B 42.C

3.D 8.D 13.B 18.C 23.D 28.B 33.C 38.D 43.A

4.B 9.B 14.A 19.C 24.B 29.B 34.A 39.C 44.D

5.A 10.D 15.B 20.A 25.C 30.A 35.C 40.C 45.B

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