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Science questions, unit 6
Nama / NameKelas / ClassTarikh / Date

Sound

35 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

8 marks
Choose the best answer for each question.
1

Question 1

What produces sound?
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A
Sound is produced when an object vibrates.
For the teacher: Remembering, low difficulty, standard 6.1.1
Textbook p. 112
2

Question 2

A boy in the school band blows a flute. What vibrates to produce the sound?
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B
When the flute is blown, the air inside it vibrates.
For the teacher: Understanding, low difficulty, standard 6.1.1
Textbook p. 112
3

Question 3

Which way of producing sound is used to play the cymbals?
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C
The two cymbal pieces are clapped together and vibrate.
For the teacher: Remembering, low difficulty, standard 6.1.1
Textbook p. 112
4

Question 4

Diagram 1 shows three children at different places around an ice cream seller. All of them can hear his bell. Why?
Three children at different positions around an ice cream seller whose bell sends out rings of sound
Diagram 1
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D
Sound spreads out in all directions from the bell, so people at different positions can hear it.
For the teacher: Understanding, low difficulty, standard 6.1.2
Textbook p. 114
5

Question 5

Fariz speaks in an empty room and hears his voice again. What happens to the sound?
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A
When sound hits a hard surface, it is reflected back. Fariz hears an echo.
For the teacher: Understanding, low difficulty, standard 6.1.3
Textbook p. 115
6

Question 6

Which technology uses reflected ultrasonic sound to detect objects in water?
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B
Sonar sends out ultrasonic sound and detects the sound that is reflected back by objects in water.
For the teacher: Remembering, low difficulty, standard 6.1.3
Textbook p. 117
7

Question 7

Traffic noise enters Aina's bedroom through the window. Which of these reduces the noise best?
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C
A thick curtain is a sound absorber. It reduces the vibration of sound. Hard, smooth surfaces reflect sound instead.
For the teacher: Applying, medium difficulty, standard 6.1.5
Textbook p. 120
8

Question 8

Loud noise can damage our hearing when it is more than
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D
Noise that exceeds 85 dB can damage our hearing. The unit dB is the decibel.
For the teacher: Remembering, low difficulty, standard 6.1.4
Textbook p. 119

Section B: structured questions

27 marks
Answer all questions. Circle the answer or write it in the space.
9

Question 9

Fariz's school band has a guitar, a xylophone and a flute.
[1 mark] (a)How is sound produced from the guitar strings?
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Plucking
Strings are plucked or bowed.
[1 mark] (b)How is sound produced from the xylophone?
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Knocking
[1 mark] (c)What vibrates when the flute is blown?
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 6.1.1
Textbook p. 112
10

Question 10

Hana ties a thread to a metal hanger and winds the ends around her fingers. She puts her fingers near her ears. Her friend taps the hanger with a pencil.
[1 mark] (a)What does Hana hear when the hanger is tapped?
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Tick each point you got.
[1 mark] (b)What causes the sound?
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Tick each point you got.
[1 mark] (c)Her friend holds the hanger still with a hand. What happens to the sound?
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It stops
When the hanger stops vibrating, there is no sound.
For the teacher: Understanding, low difficulty, standard 6.1.1
Textbook p. 113
11

Question 11

Siva and his family visit Niah Cave. As soon as they arrive, Siva shouts and hears his voice again a moment later.
[1 mark] (a)Name this phenomenon.
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Tick each point you got.
[2 marks] (b)Explain how it happens.
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Tick each point you got.
[1 mark] (c)Would Siva hear an echo if he shouted into a thick pile of cushions?
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No
Soft things absorb sound. They do not reflect it well.
For the teacher: Applying, medium difficulty, standard 6.1.3
Textbook p. 122
12

Question 12

Diagram 2 shows a school bell. Ravi says, "Pupils on the upper floor cannot hear the bell because sound only travels downwards."
School building seen from above with the bell sending sound rings to pupils on the ground and upper floors
Diagram 2
[1 mark] (a)Is Ravi correct?
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No
[2 marks] (b)Give a reason for your answer.
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Tick each point you got.
For the teacher: Evaluating, medium difficulty, standard 6.1.2
Textbook p. 114
13

Question 13

Diagram 3 shows a road worker using a drill beside a busy road.
A road worker using a loud drill beside a street with cars, people and pigeons
Diagram 3
[1 mark] (a)State one harmful effect of the loud noise on the road worker.
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Any 1 points
Tick each point you got.
[1 mark] (b)What is the unit used to measure the loudness of sound?
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Tick each point you got.
[1 mark] (c)Which item would protect the road worker's ears?
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Ear protectors
[1 mark] (d)The ambulance siren is also loud. Why is it useful?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 6.1.4
Textbook p. 118
14

Question 14

Mei Lan loves music. But tonight she cannot do her homework because her neighbour is playing loud music.
[1 mark] (a)What is the effect of the loud music on Mei Lan?
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Sound causes disturbance
[2 marks] (b)Suggest two ways to reduce the noise in her room.
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Any 2 points
Tick each point you got.
For the teacher: Applying, low difficulty, standard 6.1.4
Textbook p. 122
15

Question 15

Bats fly at night and catch insects without seeing them well. Think about how a bat uses ultrasound.
[1 mark] (a)Can humans hear ultrasound?
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No
[2 marks] (b)Explain how the bat finds its prey.
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Tick each point you got.
[1 mark] (c)Name one machine that doctors use which works in a similar way.
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Tick each point you got.
For the teacher: Analysing, high difficulty, standard 6.1.3
Textbook p. 117
16

Question 16

A new clinic is built beside a busy road. The doctor wants the patients' rooms to be quiet.
[1 mark] (a)What do we call loud or unwanted sound?
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Sound pollution
[2 marks] (b)Suggest two things the clinic can do to reduce the noise from the road.
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Any 2 points
Tick each point you got.
For the teacher: Applying, medium difficulty, standard 6.1.5
Textbook p. 120