Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 9 - Sound [Latest edition]

Chapter 9: Sound

Exercise (A) Objective QuestionsExercise (B) Subjective QuestionsExercise Practice Problems 1Exercise Practice Problems 2Exercise Practice Problems 3Exercise Practice Problems 4Exercise Practice Problems 5Exercise Practice Problems 6Exercise Practice Problems 7
Exercise (A) Objective Questions

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise (A) Objective Questions

Exercise (A) Objective Questions | Q 1

Select the correct option:

In case of longitudinal waves, the particles of the medium vibrate:

• in the direction of wave propagation

• opposite to the direction of wave propagation

• at right angles to the direction of wave propagation

• none of the above

Exercise (A) Objective Questions | Q 2

Select the correct option:

A longitudinal wave consists of:

• crest and trough in the medium

• compression and rarefaction in the medium

• both crest and trough in the medium and compression and rarefaction in the medium

• neither crest and trough in the medium and compression and rarefaction in the medium

Exercise (A) Objective Questions | Q 3

Select the correct option:

The longitudinal waves can propagate only in

• solids

• liquids

• gases

• all of these

Exercise (A) Objective Questions | Q 4

Select the correct option:

A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called:

• rarefaction

• crest

• trough

• compression

Exercise (A) Objective Questions | Q 5

Select the correct option:

A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :

• rarefaction

• trough

• compression

• crest

Exercise (A) Objective Questions | Q 6

Select the correct option:

In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:

• pressure

• mass

• density

• volume

Exercise (A) Objective Questions | Q 7

Select the correct option:

The wavelength is the linear distance between the:

• two consecutive compressions

• two consecutive rarefactions

• one compression and one rarefaction

• both two consecutive compressions and rarefactions

Exercise (A) Objective Questions | Q 8

Select the correct option:

The number of oscillations passing through a point in unit time is called:

• vibration

• frequency

• wavelength

• amplitude

Exercise (A) Objective Questions | Q 9

Select the correct option:

The SI unit of frequency is

• hertz

• gauss

• decibel

• none of these

Exercise (A) Objective Questions | Q 10

Select the correct option:

If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :

• 25

• 50

• 100

• none of these

Exercise (A) Objective Questions | Q 11

Select the correct option:

Which of the following is an elastic wave?

• light wave

• ratio wave

• sound wave

• microwave

Exercise (B) Subjective Questions

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise (B) Subjective Questions

Exercise (B) Subjective Questions | Q 1.1

What do you understand by the term sound energy?

Exercise (B) Subjective Questions | Q 1.2

State three conditions necessary for hearing sound.

Exercise (B) Subjective Questions | Q 2

Describe briefly an experiment to prove that vibrating bodies produce sound.

Exercise (B) Subjective Questions | Q 3.1

What do you understand by the term infrasonic vibrations?

Exercise (B) Subjective Questions | Q 3.2

What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.

Exercise (B) Subjective Questions | Q 4.1

What do you understand by the term ultrasonic vibrations?

Exercise (B) Subjective Questions | Q 4.2

Name three animals which can hear ultrasonic vibrations.

Exercise (B) Subjective Questions | Q 5

How do bats locate their prey during a flight?

Exercise (B) Subjective Questions | Q 6

What is Galton’s whistle? To what use is it put?

Exercise (B) Subjective Questions | Q 7

State four practical uses of ultrasonic vibrations.

Exercise (B) Subjective Questions | Q 8

Describe an experiment to prove that a material medium is necessary for the propagation of sound.

Exercise (B) Subjective Questions | Q 9

Why do astronauts talk to each other through radio telephone in space?

Exercise (B) Subjective Questions | Q 10.1

Define the term wavelength.

Exercise (B) Subjective Questions | Q 10.2

Define the term amplitude.

Exercise (B) Subjective Questions | Q 10.3

Define the term frequency.

Exercise (B) Subjective Questions | Q 11

State four differences between the sound wave and the light wave.

Exercise (B) Subjective Questions | Q 12

What is meant by the term wave motion?

Exercise (B) Subjective Questions | Q 13

State the relation between the wavelength and the frequency.

Exercise (B) Subjective Questions | Q 14

What kinds of waves are produced in solids, liquids, and gases?

Exercise (B) Subjective Questions | Q 15

The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.

(i) Who would hear the sound first: boatman or diver?

(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?

Exercise (B) Subjective Questions | Q 16

What is approximate value of the speed of sound in iron as compared to that in air? Illustrate your answer with a simple experiment.

Exercise (B) Subjective Questions | Q 17
How do bats avoid obstacles in their way, when in flight?
Exercise (B) Subjective Questions | Q 18

A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork. What does the motion of the cork tell about the disturbance?

Exercise (B) Subjective Questions | Q 19

Draw a displacement-time graph for water wave.

Exercise Practice Problems 1

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 1

Exercise Practice Problems 1 | Q 1

200 waves pass through a point in one second. Calculate the time period of wave.

Exercise Practice Problems 1 | Q 2

A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.

Exercise Practice Problems 2

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 2

Exercise Practice Problems 2 | Q 1

The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.

Exercise Practice Problems 2 | Q 2

An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.

Exercise Practice Problems 3

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 3

Exercise Practice Problems 3 | Q 1

Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:

1. frequency
2. time period.
Exercise Practice Problems 3 | Q 2

The wavelength of the vibrations produced on the surface of water is 2 cm. If the wave velocity is 16 ms-1, calculate:

1. no. of waves produced in one second
2. time required to produce one wave.
Exercise Practice Problems 4

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 4

Exercise Practice Problems 4 | Q 1.1

A continuous progressive transverse wave of frequency 8 Hz moves across the surface of a ripple tank

With reference to the frequency, describe the movement of water on the surface

Exercise Practice Problems 4 | Q 1.2

A continuous progressive transverse wave of frequency 8 Hz moves across the surface of a ripple tank

If the wavelength of the transverse wave is 32 mm, calculate the speed with which wave travels across the surface of the water.

Exercise Practice Problems 4 | Q 2

A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:

1. frequency of node produced.
2. speed of sound, if wavelength is 1.05 m.
3. what will be the effect when the speed of cog wheel is doubled?
Exercise Practice Problems 5

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 5

Exercise Practice Problems 5 | Q 1

A sound wave of wavelength 1/3 m has a frequency 996 Hz. Keeping the medium same, if frequency changes to 1328 Hz. Calculate

1. velcoity of sound
2. new wavelength.
Exercise Practice Problems 5 | Q 2

Two tuning forks A and B of frequencies 256 Hz and 192 Hz respectively are vibrated in air. If the wavelength of A is 1.25 m, calculate the wavelength produced by B.

Exercise Practice Problems 6

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 6

Exercise Practice Problems 6 | Q 1.1

The distance between one crest and one trough of a sea wave is 4.5 m. If the waves are produced at the rate of 240/min, calculate the time period.

Exercise Practice Problems 6 | Q 1.2

The distance between one crest and one trough of a sea wave is 4.5 m. If the waves are produced at the rate of 240/min, calculate the wave velocity.

Exercise Practice Problems 6 | Q 2

The distance between three consecutive crests of wave is 60 cm. If the waves are produced at the rate of 180/ min, calculate:

1. wavelength
2. time period
3. wave velocity.
Exercise Practice Problems 7

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 9 Sound Exercise Practice Problems 7

Exercise Practice Problems 7 | Q 1

The diagram given below shows a displacement distance graph of a wave. If the velocity of wave is 160 ms-1, calculate:

1. wavelength
2. frequency
3. amplitude.

Exercise Practice Problems 7 | Q 2

From diagram given below calculate:

1. velocity of P and Q
2. frequency of P, when frequency of Q is 512 Hz.

Assume that both wave are traveling in same medium.

Chapter 9: Sound

Exercise (A) Objective QuestionsExercise (B) Subjective QuestionsExercise Practice Problems 1Exercise Practice Problems 2Exercise Practice Problems 3Exercise Practice Problems 4Exercise Practice Problems 5Exercise Practice Problems 6Exercise Practice Problems 7

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 9 - Sound

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 9 (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 Class 9 A New Approach to ICSE Physics Part 1 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 A New Approach to ICSE Physics Part 1 chapter 9 Sound are Production of Sound, Propagation of Sound, Sound Need a Medium to Travel, Characteristics of a Sound Wave, Representation of a Wave, Relationship Between the Wavelength, Wave Velocity and Frequency, Factors Affecting Speed of Sound in Gas, Factors Not Affecting Speed of Sound in a Gas, Experimental Determination of Speed of Sound in Air, Properties of Sounds, Audibility and Range, Speed of Sound in Different Media, Speed of Sound (Velocity of Sound), Sound, Ultrasonic Sound Or Ultrasound, Difference Between the Sound and Light Waves.

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