Chapter 1 Practice Paper: General Properties of Waves — question paper (print)

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Secondary 4 · Physics (G2 / G3)

Chapter 1 Practice Paper

General Properties of Waves

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Write your name, class and register number in the spaces at the top of this page.
Answer all questions.
Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
Take the speed of sound in air as 340 m/s unless stated otherwise.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Wave motion, v = fλ, transverse and longitudinal waves, sound, echoes and ultrasound.

For Examiner’s Use
Section A	/ 10
Section B	/ 20
Total	/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

1
A wave carries
1. Amatter from source to observer
2. Benergy without transferring matter
3. Cparticles along its path
4. Donly information
( )
2
The time for one complete oscillation is called the
1. Afrequency
2. Bamplitude
3. Cwavelength
4. Dperiod
( )
3
Ripples of wavelength 0.80 m pass a fixed point 25 times each second. Their speed is
1. A0.032 m/s
2. B20 m/s
3. C31 m/s
4. D25.8 m/s
( )
4
Sound travels from a ringing bell to your ear as
1. Aa transverse wave of air molecules travelling outward
2. Ban electromagnetic wave
3. Ca chain of compressions and rarefactions of the air
4. Da stream of air blown from the bell
( )
5
A sonar pulse returns from the sea bed 0.40 s after emission. Taking the speed of sound in sea water as 1500 m/s, the depth is
1. A300 m
2. B375 m
3. C600 m
4. D750 m
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1
A long rope is tied to a wall. A student flicks the free end once and a single hump travels along the rope to the wall and back.
1. (a)
  State what travels along the rope and what does not.
  [2]
2. (b)
  Describe the motion of a point on the rope as the hump passes it.
  [2]
3. (c)
  The reflected hump returns upside down. State what this tells you about reflection at the fixed wall.
  [1]
2
A ripple tank produces straight waves. A student counts 12 wave crests passing a fixed point in 6.0 s, and the crests are 2.5 cm apart.
1. (a)
  Calculate the frequency of the waves.
  frequency =Hz[2]
2. (b)
  State the wavelength in metres.
  wavelength =m[1]
3. (c)
  Calculate the speed of the waves.
  speed =m/s[2]
4. (d)
  The water becomes shallower and the waves slow to 0.030 m/s. State what happens to the wavelength if the frequency is unchanged, and calculate the new value.
  [2]
3
A girl claps two wooden blocks together in front of a tall flat wall and listens for the echo. She hears a single clear echo 0.30 s after each clap. Take the speed of sound in air as 340 m/s.
1. (a)
  Explain why an echo is heard.
  [2]
2. (b)
  Calculate the distance from the girl to the wall.
  distance =m[3]
3. (c)
  She walks backwards until the echo merges with the original clap (shorter than about 0.10 s round trip). Calculate the new maximum distance for a distinct echo, and state the distance at which the echo first becomes distinct as she walks away again.
  [3]

— End of paper —