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# Selina solutions for Concise Physics Class 7 ICSE chapter 6 - Sound [Latest edition]

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## Chapter 6: Sound

### Selina solutions for Concise Physics Class 7 ICSE Chapter 6 Sound Objective Questions

Objective Questions | Q 1.1

Write true or false for a given statement.

Sound can travel in a vacuum.

• True

• False

Objective Questions | Q 1.2

Write true or false for a given statement.

A sound is a form of energy.

• True

• False

Objective Questions | Q 1.3

Write true or false for a given statement.

Sound can only be produced by vibrating bodies.

• True

• False

Objective Questions | Q 1.4

Write true or false for a given statement.

Larger is the amplitude, feeble is the sound.

• True

• False

Objective Questions | Q 1.5

Write true or false for a given statement.

The frequency is measured in hertz.

• True

• False

Objective Questions | Q 1.6

Write true or false for a given statement.

Loudness depends on frequency.

• True

• False

Objective Questions | Q 1.7

Write true or false for a given statement.

Waveforms of two different stringed instruments can be the same.

• True

• False

Objective Questions | Q 1.8

Write true or false for a given statement.

Female voice is shriller than the male voice.

• True

• False

Objective Questions | Q 1.9

Write true or false for a given statement.

A ticking clock sound is heard late when heard through a metal.

• True

• False

Objective Questions | Q 2.1

Fill in the blank.

Sound is produced when a body ______.

Objective Questions | Q 2.2

Fill in the blank.

The number of times a body vibrates in one second is called its ______.

Objective Questions | Q 2.3

Fill in the blank.

The pitch of a sound depends on its ________.

Objective Questions | Q 2.4

Fill in the blank.

Sound can travel in a ______

Objective Questions | Q 2.5

Fill in the blank.

We can hear sounds of frequency in the range of _______

Objective Questions | Q 2.6

Fill in the blank.

Sound requires a ________ for propagation.

Objective Questions | Q 2.7

Fill in the blank.

Sound travels faster in ________ than in liquids.

Objective Questions | Q 2.8

Fill in the blank.

The sound heard after reflection is _______

Objective Questions | Q 2.9

Fill in the blank.

________ produces a sensation in ears.

Objective Questions | Q 3
 Column A Column B (a) Vibrations cause (1) absorb sound (b) A shriller sound is (2) second (c) Unit of frequency (3) sound (d) Unit of time period (4) of high pitch (e) Curtains (5) hertz
Objective Questions | Q 4.1

Select the correct alternative :

We can distinguish a shrill sound from a flat sound by its

• amplitude

• loudness

• pitch

• none of the above.

Objective Questions | Q 4.2

Select the correct alternative :

We can hear sound of frequency

• 10 Hz

• 500 Hz

• 100,000 Hz

• 50,000 Hz

Objective Questions | Q 4.3

Select the correct alternative :

Sound cannot travel in

• gases

• liquids

• solids

• vacuum

Objective Questions | Q 4.4

Select the correct alternative:

The minimum distance required between the source and the reflector so as to hear the echo in air is

• 10 m

• 17 m

• 34 m

• 50 m

Objective Questions | Q 4.5

Select the correct alternative :

Wavelength is measured in

• kg

• second

• litre

• meter

Objective Questions | Q 4.6

Select the correct alternative :

The speed of sound in water is

• 332 m

• 1500 m

• 5000 m s

• 1000 m s

Objective Questions | Q 4.7

Select the correct alternative :

Sound travels the fastest in

• liquids

• solids

• gases

• vacuum

### Selina solutions for Concise Physics Class 7 ICSE Chapter 6 Sound Short/Long Answer Questions

Short/Long Answer Questions | Q 1

What do you mean by a vibratory motion ?

Short/Long Answer Questions | Q 2

What is sound ?

Short/Long Answer Questions | Q 3

How is sound produced ?

Short/Long Answer Questions | Q 4

Describe an experiment to show that each source of sound is a vibrating body.

Short/Long Answer Questions | Q 5

Name two sources of sound.

Short/Long Answer Questions | Q 6

How do we produce sound ?

Short/Long Answer Questions | Q 7

The bees do not have voice-boxes. How do they produce sound ?

Short/Long Answer Questions | Q 8

Can sound travel through a vacuum ? Describe an experiment to explain your answer.

Short/Long Answer Questions | Q 9

Describe an experiment to show that sound can travel in water.

Short/Long Answer Questions | Q 10

Describe an experiment to show that sound can travel in a solid.

Short/Long Answer Questions | Q 11

Can two person hear each other on moon’s surface ? Give reason to support your answer.

Short/Long Answer Questions | Q 12

What is a longitudinal wave ?

Short/Long Answer Questions | Q 13.1

Define Amplitude ?

Short/Long Answer Questions | Q 13.2

Define time period ?

Short/Long Answer Questions | Q 13.3

Define Frequency?

Short/Long Answer Questions | Q 14

Write the audible range of frequency for the normal human ear.

Short/Long Answer Questions | Q 15

What are ultrasonics? Can you hear the ultrasonic sound?

Short/Long Answer Questions | Q 16

What are infrasonics? Can you hear them?

Short/Long Answer Questions | Q 17

How does a bat make use of ultrasonics waves to find its way?

Short/Long Answer Questions | Q 18

Name the two characteristics of sound which differentiate two sounds from each other.

Short/Long Answer Questions | Q 19

On what factor does the loudness of a sound depend ?

Short/Long Answer Questions | Q 20

How does the loudness of sound produced depend on the vibrating area of the body ?

Short/Long Answer Questions | Q 21

The outer case of the bell in a temple is made big. Give a reason.

Short/Long Answer Questions | Q 22

State the factors on which the pitch of a sound depends.

Short/Long Answer Questions | Q 23

Differentiate between a high pitch sound and a low pitch sound.

Short/Long Answer Questions | Q 24

How does a man’s voice differ from a woman’s voice ?

Short/Long Answer Questions | Q 25

Name the characteristic which differentiates two sounds of the same pitch and same loudness.

Short/Long Answer Questions | Q 26

You recognize your friend by hearing his voice on a telephone. Explain.

Short/Long Answer Questions | Q 27

A musician recognizes the musical instrument by hearing the sound produced by it, even without seeing the instrument. Which characteristic of sound makes this possible ?

Short/Long Answer Questions | Q 28

Describe an experiment to show the production of sound having low and high pitch.

Short/Long Answer Questions | Q 29

How does a musician playing on a flute change the pitch of sound produced by it ?

Short/Long Answer Questions | Q 30

Why are musical instruments provided with more than one string ?

Short/Long Answer Questions | Q 31

How can the pitch of sound produced in a piano be changed ?

Short/Long Answer Questions | Q 32

Explain why you can predict the arrival of a train by placing your ear on the rails without seeing it.

Short/Long Answer Questions | Q 33.1

Write the approximate speed of sound in air.

Short/Long Answer Questions | Q 33.2

Write the approximate speed of sound in water .

Short/Long Answer Questions | Q 33.3

Write the approximate speed of sound in steel.

Short/Long Answer Questions | Q 34

During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why ?

Short/Long Answer Questions | Q 35

Describe an experiment to estimate the speed of sound in air.

Short/Long Answer Questions | Q 36

Can sound travel through solids and liquids ? In which of these two does it travel faster ?

Short/Long Answer Questions | Q 37

What do you mean by reflection of sound ?

Short/Long Answer Questions | Q 38

State one use of reflection of sound.

Short/Long Answer Questions | Q 39

What is echo ?

Short/Long Answer Questions | Q 40

What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.

Short/Long Answer Questions | Q 41

List four substances which are good absorbers of sound.

Short/Long Answer Questions | Q 42

List the measures that you will take when designing a sound-proof room.

### Selina solutions for Concise Physics Class 7 ICSE Chapter 6 Sound Numericals

Numericals | Q 1

A boy fires a gun and another boy at a distance of 1020 m hears the sound of firing the gun 3 s after seeing its smoke. Find the speed of sound.

Numericals | Q 2

A boy on a hill A fires a gun. The other boy on hill B hears the sound after 4 s. If the speed of sound is 330 m s-1, find the distance between the two hills.

## Selina solutions for Concise Physics Class 7 ICSE chapter 6 - Sound

Selina solutions for Concise Physics Class 7 ICSE chapter 6 (Sound) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Physics Class 7 ICSE chapter 6 Sound are Sources of Sound, Sound as a Longitudinal Wave, Characteristics of a Sound Wave: Amplitude (Relate Amplitude with Loudness), Characteristics of a Sound Wave - Frequency, Sound Needs a Medium to Propagate, Reflection and Absorption of Sound, Relative Speed of Sound in Different Mediums, Concept of Sound.

Using Selina Class 7 solutions Sound exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

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