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Case Study Questions for Class 8 Science Chapter 13 Sound

Last modified on: 10 months ago
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Here we are providing case study questions for CBSE Class 8 Science Chapter 13 Sound.

Case Study Questions

Question 1:

Sound plays an important role in our life. It is a form of energy which makes us hear . Vibrating objects produce sound. Vibration is the to and fro or back and forth movement of an object. Sound needs a medium to travel. Hence, it cannot travel in a vacuum.

Human beings have a voice box or larynx which is present in their throat on the upper side of the windpipe. The larynx has two vocal cords which have a narrow slit between them so that air can pass through it. As the lungs throw the air out of the windpipe, it passes through the slit and hence allows the production of sound as the vocal cords start vibrating. Since sound travels in the form of waves, it is important to study about characteristics of waves. The three main properties of waves are Amplitude, frequency, and time period.

The magnitude of disturbance in the medium on either side of the mean value is called as Amplitude(A). Larger the amplitude, louder the sound. The number of oscillations/vibrations per second is called frequency. which is expressed in Hertz (Hz). Time taken for one complete oscillation/vibration is the time period.

i) Which part of the human throat is responsible for the voice produced by a human?

ii) The form of energy which enable us to hear:

iii) The rapid to and fro or up and down movement of an object from its mean position:

iv) The maximum displacement of a vibrating object from its mean position:

iii) Vibration

iv) Amplitude

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Cbse class 8 - physics - sound - case study based question #class8science #sound #physics #eduvictors.

CBSE Class 8 - Physics - Sound - Case Study Based Question

Q1. Read the following and answer the questions given below:

Sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Hence, the sound is a wave. Sound is produced by vibrating objects. Vibration can be described as to and fro motion of an objects. Sound cannot be produced without any vibrations. Sound always requires a medium to travel from the source of its production to the receiver end. Speed of the sound is maximum in solids and minimum in gases.

(i) The audible frequency range of a human ear is:

(a) The range of audible frequency of human ear is 20 to 200 Hz

(b) The range of audible frequency of human ear is 2 Hz to 20 Hz

(c)The range of audible frequency of human ear is 200 to 2000Hz.

(d) The range of audible frequency of human ear is 20 to 20,000Hz

(ii) Ria used a device to measure the loudness of a machine. She recorded her observation as given below. Which of the following represents the correct measurement of loudness?

(iii) Arrange the speed of sounds in solids, liquids and gases in an ascending order:

(a) Gas < Liquid < Solid

(b) Liquid > Gas > Solid

(d) Solid > Liquid > Gas

(iv) The number of vibrations made by a vibrating body in one second is:

(a) frequency

1. (d) The range of audible frequency of human ear is 20 to 20,000Hz

2. (c) 80 dB

3. (a) Gas < Liquid < Solid

4. (a) frequency

Ch 13 - Sound (Q & A) Ch 13 - Sound (MCQs) Ch 13 - Sound (Worksheet) Ch 13 - Sound (Question Bank) Ch 13 - Sound (Worksheet)

CBSE All In One NCERT Based Science Class 8 2022-23 Edition

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Sound Class 8 Case Study Questions Science Chapter 10

Last Updated on April 23, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 8 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science chapter 10 Sound.

Table of Contents

Case Study Questions on Sound

Question 1:

Read the given passage below and answer the question:

Raghav kept a mini sound player in each of two similar containers. He then tightly covered both the containers with stretched plastic sheets. He placed some tiny rubber beads on the surface of the sheets. The picture shows what Raghav noticed when he turned on the sound player.

(i) Which of these questions can be answered using the result of Raghav’s activity? (a) Does sound travel as waves? (b) Does sound produce vibration? (c) Does sound travel through a vacuum? (d) Does sound travel faster in solids than in gases?

Difficulty Level: Easy

Ans. Option (b) is correct. Explanation: The question “Does sound produce vibration?” can be answered using the result of Raghav’s activity because the rubber beads started jumping due to vibrations produced when the sound player is turned on.

(ii) Would the result of Raghav’s activity change if fewer beads had been used? Explain your answer.

Ans. No, the result would remain the same. This is because the vibration would still make the beads jump no matter what the number of beads present.

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Crop production and management class 8 case study questions science chapter 1, topics from which case study questions may be asked.

Understand how sound is produced?
Understand vibration as a cause of the sound.
Learn different types of sound.
Learn about the medium of sound propagation.
Understand the terms Frequency, Amplitude and Time period of vibration.
Learn about audible and inaudible sounds.
To understand noise pollution and its ill effects.

Sound is anything that we hear. It is a form of energy. Vibrations in any object produces sound. This chapter deals with the concept of sound.

Frequently Asked Questions (FAQs) on Sound Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 8 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of sound, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 8 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience.

Q5: How can students effectively prepare for case study questions on sound for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on sound class 8 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of concepts of sound.

Q7: Define the terms Infrasonic and Ultrasonic sounds. Can we hear them?

A7: Sound with frequency less than 20 Hz frequency is called infrasonic sound and with frequency more than 20 kHz is called ultrasonic sound. These types of sounds are inaudible to humans.

Q8: Which part of the human ear vibrates to hear the sounds?

A8: A stretched membrane in the outer ear called ear drum vibrates when sound waves fall on it and enable one to hear the sound.

Q9: What is amplitude? How it affects loudness of sound?

A9: Amplitude is the maximum displacement of a vibrating object from its mean or central position. Loudness of sound depends upon its amplitude. Loudness of sound is proportional to the square of the amplitude. When the amplitude of vibration is large the sound produced is loud. When the amplitude is small, the sound produced is feeble.

Q10: What are the harmful effects of noise pollution on our health?

A10: Noise pollution can be quite dangerous for our health. Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution. A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing

Friction Class 8 Case Study Questions Science Chapter 9

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Sound CBSE Class 8 Science Revision Notes Chapter 13

What is sound.

A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Hence, the sound is a wave.

Vibration can be described as a back and forth motion of an object.

Depending upon the vibrations, a sound is produced. Sound cannot be produced without any vibration.

Figure 1 Production of Sound through Vibrations

Figure 2 Different instruments produce different sounds

How do humans produce sound?

Human beings have a voice box or larynx which is present in their throat on the upper side of the windpipe.

The larynx has two vocal cords which have a narrow slit between them so that air can pass through it.

As the lungs throw the air out of the windpipe, it passes through the slit and hence allows the production of sound as the vocal cords start vibrating.

The vocal cord muscles also play a role in the production of sound.

Their thickness and tightness describe the quality or type of the voice a person has.

The vocal cords in males are of length 20 mm and females have 15mm long vocal cords. Children, on the other hand, have very short length vocal cords. Hence, the voices, their quality and their type are always different in women, men and children.

Figure 3 Larynx or Voice box

Propagation of sound through a medium

Sound always requires a medium to travel from the source of its production to the receiver end. Different mediums of propagation of sound are air, liquid and solids.

Sound cannot travel through a vacuum as it lacks any medium of transmission.

Figure 4 Sound Waves

How sound travels in a medium?

Sound needs some vibration of molecules to travel.

Solids, liquids and gases all have molecules present in them which allow the propagation of sound.

These molecules or particles in solids, liquids and gases are packed in varied ways.

Solids have tightly packed particles in them and hence they allow fast propagation of sound through them as the vibrations can be carried easily from one particle to another.

Liquids have slightly loosely packed particles and hence it takes a little time for sound to travel in water or through a liquid.

Gases have completely loosely packed particles and hence sound takes the most time in travelling through the air.

How do we hear?

We know that sounds are produced as waves in the air or any other medium.

As these sound waves travel to our ears they convert them into electrical signals or messages that our brain can understand.

Our ears have a special structure that allows this function.

There are three major parts of the human ear:

Figure 5 The Human Ear

The outer ear (Pinna): It catches the sound waves and forwards them to the next part of the ear, that is, the middle ear.

The middle ear : It converts the sound waves into vibrations that then travel to the inner ear. It can do this with the help of the eardrum. The eardrum is a thin rubber-like sheet present in the Middle ear. As the sound waves reach the eardrum, it vibrates and these vibrations propagate to the inner ear.

The inner ear (cochlea): It receives the vibrations sent by the eardrum. It contains a liquid substance and the vibrations that enter the inner ear moves through this liquid. There are tiny hairs present inside the inner ear that turn these vibrations into signals for the brain and pass them to the brain through the hearing nerve. As the brain receives the signal it interprets the sound. However, this whole process is so quick that we cannot notice it.

Frequency, Time Period and Amplitude of a Sound

Figure 6 Displacement of Particles by Production of Sound and Representation of A Sound Wave

The loudness of a sound

The loudness of a sound depends upon the amplitude of the sound.

The higher the amplitude, the higher is the displacement of the particles and the higher is the loudness of the sound.

The loudness of the sound is directly proportional to the square of its amplitude.

The SI unit for measuring the loudness of a sound in decibels (dB).

Pitch of the sound

Every person has a different sound quality.

Also, every musical instrument vibrates to produce a different kind of sound. This quality of sound is characterized by its Different quality of sounds may have same pitch and loudness.

The pitch of a sound depends upon the frequency of the sound wave.

The pitch would be higher if the frequency of the sound is high.

Different organisms and objects have different type of sound because of varied pitch:

Figure 12 Loudness and Pitch of a Sound

How Loudness and Pitch are different from each other?

Audible and inaudible sounds.

Sounds that can be heard by human ears are called audible sounds . The range of audible sounds is from 20 Hz to 20 KHz.

Sounds that cannot be heard by human ears are called inaudible sound . Any sounds having a frequency less than 20 Hz or greater than 20 KHz are categorized as inaudible sounds.

Figure 15 Loudness of Sound from various Sources

The inaudible sounds can be divided into two categories as infrasound and ultrasound.

Figure 16 Infrasound and Ultrasound

Noise and Music

Noise can be regarded as an unpleasant sound. Noise consists of sound waves of varied frequencies which have no particular periodic pattern of repetition. Therefore, noise is regarded as a mixture of sound waves with irregular frequencies.

Music , on the other hand, is a pleasant sound that has a clear pitch. Musical sound can be created by arranging and combining different sounds in a particular order. The frequencies of a musical sound are harmonious in nature.

Figure 17 Noise And Music

Noise pollution

Noise pollution can be defined as the presence of undesirable and unpleasant sounds in the earth's environment.

Human beings can bear sounds ranging up to 85 decibels only. Above that, any noise can damage our hearing power.

Generally, any sound that has a frequency of more than 30 dB is considered noise.

The unwanted noise causes an adverse effect on the health of the organisms present on the earth.

According to the World Health Organization, the maximum sound limit that is ideal for cities is 45 dB only.

However, it has been found that the sound range in many big cities of the world lies up to 90 dB.

Hence noise pollution is common in many cities today and even rural areas to a great extent.

Figure 18 Noise Pollution

Causes of noise pollution

Transport noise: The sound of the traffic on roads, railways and aircraft leads to noise pollution. As the number of vehicles such as cars, motorcycles, buses and trucks is increasing in the cities, especially the Metropolitans, noise pollution is extremely high there.

Industrial noise: Industries, factories and other commercial businesses cause high-intensity sounds that pollute the environment.

Neighbourhood noise : The noise from the radios, televisions, air conditioners, coolers, kitchen applications and other electrical appliances used in houses lead to noise. Not only this, commercialization around the residential areas often leads to unwanted sounds due to small-scale industries such as printing, car repairing etc.

Construction noise: Construction of houses, industries and various architectures also lead to sound pollution.

Political activities: Noise pollution is also created due to the rallies and demonstrations conducted by various political parties in cities and rural areas.

Bursting of crackers and fireworks: People burst crackers on several occasions such as festivals and ceremonies that lead to sound pollution in the neighbourhoods.

Natural sounds: The environment of the earth also sometimes leads to unpleasant sounds due to lightning, thunderstorms, earthquakes, volcanic eruptions, sounds of various animals etc.

Figure 19 The Noise Thermometer

Effects of Noise Pollution

Excessive noise in the surroundings can lead to serious health problems such as hypertension, lack of sleep or insomnia, anxiety, lack of memory, stress, irritation and even nervous breakdown.

It can lead to temporary or permanent hearing loss in human beings as well as animals.

Excessive noise leads to increased blood pressure. It increases cholesterol levels in the blood and therefore increases the chances of cardiovascular diseases in a person.

If sound intensity is more than 180 dB it can lead to the death of a person.

Noise pollution also leads to a decrease in the production of digestive juices by our body.

It can affect animals as well and can lead to their death and loss of habitats. Excessive noise decreases a person's ability to concentrate especially on children and they are unable to concentrate well on their studies due to neighbourhood noises.

Unwanted sounds in the environment can hinder the animals from finding their prey or their direction of motion.

Prevention of Noise Pollution

Factories and other industries should be set up at a distance from residential areas.

Silencing devices should be incorporated into heavy vehicles such as aircraft, industrial equipment, machinery and other home appliances.

We should always play television, radio and other music systems at a low sound so that it does not harm the neighbourhood.

Use of horns should be minimized especially near public places such as hospitals, religious places and schools.

Soundproofing systems should be installed in industries, party halls and other buildings that produce a high amount of unwanted sounds.

Trees should be planted in huge numbers as they can absorb unwanted noise from the environment.

People who work in noisy conditions such as industries and mines should be provided earplugs to protect their ears.

People should be made aware of noise pollution its adverse effects so that they can take an active involvement in preventing it.

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Chapter 13 Class 8 - Sound

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Get NCERT Solutions, Extra Questions, Worksheets, and Notes of Chapter 13 Class 8 Sound. Teachoo also provides solutions of all Maths and Science NCERT Questions with explanation of Concepts.

In this chapter, we will study

What is Sound ?

How is sound produced ?

Different Musical Instruments and how sound is produced in them

What is Medium of Sound? In which medium does sound travel?

Amplitude, Frequency and Time Period of Sound

Difference between Frequency and Amplitude

How is sound produced by Humans

How do we hear sounds ?

What do you mean by Noise and Music?

What is the difference between Noise and Music

What is Noise Pollution ?

What are the c auses and effects of Noise Pollution

How to reduce Noise Pollution ?

What is Hearing Impairment?

What are Audible and Inaudible Sounds

What are Ultrasonic Sounds ?

What are the different methods of producing sound ?

When we hear a sound, does any part of our body vibrate ? Name the part.

Does any part of the body vibrate when we speak ? Name the part.

Why is the voice of men, women and children different ?

In which medium sound travels more faster - Water, Glass, Air, Vacuum. Why?

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Sound Class 8 Notes CBSE Science Chapter 13 [Free PDF Download]

Revision Notes
Chapter 13 Sound

Revision Notes for CBSE Science Class 8 Chapter 13 - Free PDF Download

CBSE Class 8 Science Ch 13 Notes briefs students on all the essential topics that highlight the importance and the role of sound in our everyday life. The Class 8 Science Chapter 13 Sound Notes by Vedantu help students comprehend the concepts under the chapter. Students can learn from the concise revision notes given here and simplify their preparation. The Class 8 Science Sound Notes provides an overview of the chapter Sound through solved exercise questions that enhance and improvise preparation. The Notes of the Chapter 13 Science Class 8 PDF, available in downloadable format, are an authentic source of reference curated by experts to build-up the preparation process.

Vedantu offers free CBSE Solutions (NCERT) and additional study materials for students. For math students seeking better solutions, they can download Class 8 Maths NCERT Solutions to revise the entire syllabus and improve their exam scores.

Download CBSE Class 8 Science Revision Notes 2024-25 PDF

Also, check CBSE Class 8 Science revision notes for other chapters:

Access CBSE Class 8 Science Chapter 13 - Sound Notes

1. What is the Sound?

Sound is those vibrations that travel either through the air or another medium and at the same time can be heard when they reach a person's or animal's ear.

2. Musical Sound: The sound which leads to a pleasing effect on the ear.

3. Noise: The sounds which cause a jarring or an unpleasant effect.

Types of Sound:

a. Audible Sound: Those vibrations whose frequency lies between 20 Hertz to 20,000 Hertz (20 kHz) can be easily heard by the human ear.

b. Inaudible Sound: Sounds that have frequencies either above 20,000 Hertz or below 20 Hertz cannot be heard by the normal human ear.

4. The low frequency sounds which cannot be heard by ear are known as infrasonics whereas the high frequency sounds which cannot be heard are known as ultrasonics.

5. The vibration of the vocal cords in human beings produces sound.

6. Sound requires a medium to travel. This medium could be gas, liquid or solid but it cannot travel through the vacuum.

7. The eardrums in the ear are receptors of the vibrations of sound. It further sends those vibrations to the inner ear. From there, these signals are carried to the brain and interpreted as sound.

8. Higher or unwanted sounds lead to noise pollution. Noise pollution can lead to serious health problems in human beings. For example, Lack of sleep, high blood pressure, anxiety and many other health disorders could be consequences to noise pollution. A person who is continuously exposed to a loud sound can get either temporary or even cause permanent impairment of hearing.

9. How can we manage noise pollution?

We should try to reduce noise pollution.

a. In aircraft engines, transport vehicles, industrial machines and home appliances, silencing devices must be installed.

b. Planting more trees on the roadside and in parks can also reduce noise pollution.

10. Amplitude: It is the maximum extent of vibration of the vibrating body from its mean position.

11. Time Period: One complete to and fro movement of the pendulum around its mean position is one oscillation and the time taken by any vibrating particle to complete its one oscillation is known as time period.

12. What is the frequency?

It is the number of vibrations produced by the vibrating body in one second. SI unit of frequency - hertz (Hz).

13. What are the characteristics of Sounds?

a. Loudness: The vibrations produced in the ear which allow us to distinguish between a loud and a faint sound. The larger the amplitude of vibration, the louder the sound. Loudness of sound is directly proportional to the square of the amplitude.

b. Pitch: The characteristics of sound that make a difference between a shrill sound and a soft sound. The higher the frequency of vibration is, the higher is the pitch.

c. Quality: It is the characteristic that allows distinguishing between musical notes emitted by different musical instruments or voices even though they have the same pitch and loudness.

Introduction to Class 12 Business Studies Marketing Revision Notes

In Sound Class 8 Notes, students will understand the vital role of Sound in every individual’s life. Through the Sound Notes Class 8 chapter PDF, students will comprehend how an individual can know if someone is approaching just by listening to the footsteps.

The Sound Chapter Class 8 Notes imparts knowledge about the concept of vibration and how vibrating objects produce sound. Vibration is a process of the ‘to and fro’ or the ‘front and back’ movement of an object. The Notes of Chapter Sound Class 8 PDF explain how sound travels through a medium and the reason behind its restriction while travelling through vacuum.

What is Sound?

(image will be uploaded soon)

Sound is defined as the vibrations that can travel through any medium like air and can be heard when the vibrations reach an individual or an animal’s ear. Musical sound is a sound which produces a pleasing effect to the ear while noise is defined as a sound that creates a jarring or an unpleasant effect.

Types of Sound

There are two distinct types of sound-

a. Inaudible Sound: Inaudible sounds have a frequency above 20,000 Hz or below 20 Hz. An average human ear cannot hear a sound within this frequency level.

Low-frequency sounds that remain inaudible to the human ear are known as Infrasonics.

High-frequency sounds that remain inaudible to the human ear are known as Ultrasonics.

b. Audible Sound: The audible sounds are vibrations whose frequency lies between 20 Hz and 20,000 Hz (20 kHz). The human ear can hear this frequency level.

Characteristics of Sound

There are three primary characteristics of sound:

a. Loudness: Loudness is a sensation produced in ears which enables individuals to distinguish between a faint and loud sound. If the amplitude of vibrations is larger, the sound produced will be more audible. Loudness is directly proportional to the square of the amplitude of a wave.

b. Pitch: Pitch is a characteristic of sound which enables individuals to distinguish a soft sound and a shrill sound. Higher the frequency of vibrations, higher would be the pitch and shrillness.

c. Quality: Quality is a characteristic of sound which enables individuals to distinguish the musical sounds emitted by different voices or musical instruments, even though they possess the same loudness and pitch.

What is Amplitude and Time Period?

Amplitude: is defined as the maximum extent of vibrations produced by any vibrating body from its mean position. An example of amplitude is how much a radio wave moves back and forth.

Time Period: One completed to and fro movement of the pendulum from its mean position is known as an oscillation. The total time taken by the vibrating particle to complete one oscillation is known as the Time Period.

Why are Revision Notes for Class 8 CBSE Science Chapter 13 - Sound Important?

Vedantu’s Revision Notes for Class 8 Science Chapter 13 - “Sound” are the finest material to understand and practice the topics in the best way.

The material carries all the information in detail and pointwise.

All the cases of the material are solved in the simplest way which explains the term clearly.

Vedantu Revision Notes for Class 8 Chapter 13 Sound provides all the main topics so that the student can focus on it and prepare for the exam.

By immersing yourself in the Class 8 Science Notes Chapter 13 Sound, you not only prepare for your exams more efficiently but also develop a profound understanding of the subject matter. The convenience of downloading these revision notes to your smart devices empowers you to study at your own pace, making learning more flexible and accessible. Vedantu, as a dedicated platform, aims to provide students with free CBSE Solutions (NCERT) and other essential study materials. Thus, the world of knowledge is at your fingertips, with the resources you need to excel in your academic journey.

FAQs on Sound Class 8 Notes CBSE Science Chapter 13 [Free PDF Download]

1. Define Waves and Enlist the Types of Waves.

Ans: Waves are sound produced by vibrating objects and travel from one place to another in the form of waves. Mechanical waves travel through a material medium and are of two types, depending on the wave propagation and the direction of motion of the particle of the medium:

Transverse Wave: is a wave where the particle motion is perpendicular to the direction of the wave motion - for example, light.

Longitudinal Wave: is a wave where the particles of the medium travel parallel to the wave motion direction through the means of rarefaction or successive compression - for example, a slinky.

2. Define Noise Pollution and State the Measures to Control Noise Pollution.

Ans: Noise pollution is defined as any disturbing noise that harms or interferes with human lives or wildlife. Although Noise pollution is continuously around us, it receives less attention than the other environmental pollution.

Methods to Prevent Noise Pollution:

Noise pollution can cause hypertension, hearing impairment, and sleeplessness; therefore, installation of vinyl, carpets, or rugs, or acoustic foam panels or noise-reducing insulation and glass will help the conditions.

Another way to reduce or prevent escalating noise pollution is by placing furniture next to walls or by covering windows with heavy drapes.

Finally, planting of trees along roads can also reduce noise pollution.

3. What is the speed of sound in Class 8 notes?

Sound travels faster in denser and more elastic mediums, such as solids and liquids, than in less dense and less elastic mediums, such as gasses.

4. What is the SI unit of sound in Class 8 CBSE Science Chapter 13?

SI unit of sound is decibel (dB)

5. How does sound travel as explained in Class 8 Notes of CBSE Science Chapter 13?

Sound travels through vibrations in a medium, such as air or water.

6. What are the properties of sound in Class 8 Science Chapter 13 Of CBSE?

Sound has four main properties: wavelength, Amplitude, Frequency, Time period and Velocity.

NCERT Solutions

Study materials for class 8.

Sound Class 8 Important Questions and Answers

Important questions of Class 8 Science Chapter 13 Sound is given below. These important questions will help students while preparing for the exam. Practising these important questions will analyse their performance and work on their weak points. Score well in exam of Class 8 Science by going through these important questions. Students of Class 8 can download important questions of Class 8 Science Chapter 13 Sound PDF by clicking the link provided below.

Important Questions of Class 8 Science Chapter 13 Sound

Here you can get Class 8 Important Questions Science based on NCERT Text book for Class 8. Science Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Sound for Class 8 Science subject.

Very Short Answer Questions

1. What is sound? Answer: Sound is the medium by which we communicate with one another.

2. How is sound produced? Answer: Sound is produced by vibrating bodies.

3. Do all bodies can produce sound? Answer: No, all bodies cannot produce sound.

4. What do you feel when you touch a sound producing school bell? Answer: We feel the vibrations in the bell.

5. Touch the bell when it stops producing sound. Can you feel the vibrations? Answer: No, we cannot feel vibrations.

6. What do you understand by this? Answer: We understand that only vibrating bodies can produce sound.

7. What do you understand by vibrations? Answer: The back and forth motion of an object is called vibration.

8. In some cases we cannot see vibrations explain why is it so? Answer: When amplitude of vibrations is very small, then we cannot see them.

9. What is amplitude? Answer: The maximum displacement of a vibrating body on one side is called amplitude.

10. Name a musical instrument which produces sound by air column. Answer: Flute.

11. Name the sound producing organ in human. Answer: Larynx.

12. What is the other name of larynx? Answer: Larynx is also called voice box.

13. What are vocal cords? Answer: The cords stretched across the voice box or larynx are called vocal cords.

14. Do all animals produce sound by vocal cords? Answer: No, all animals do not produce sound by vocal cords.

15. On which quality of sound or voice depend? Answer: The quality of sound or voice depends on the looseness or tightness of vocal cords.

16. Do the length of vocal cords is same in men and women? Answer: No, the length of vocal cords is not same in men and women.

17. What is the length of vocal cords in men and women? Answer: The length of vocal cords in men and women is 20 mm and 15 mm respectively.

18. How does sound travel from one place to another? Answer: Sound travels through a material medium from one place to another.

19. Can sound travel through vacuum? Answer: No, sound cannot travel through vacuum.

20. What types of medium is required to travel sound? Answer: The medium may be solid, liquid or gas.

21. How do whales and dolphins hear the sound? Answer: Whales and dolphins live in water. They hear sound through water.

22. Name the organs in human which receives sound. Answer: Ears.

23. What is outer part of ear called? Answer: The outer part of the ear is called pinna. It is funnel shaped.

24. What is eardrum? Answer: A thin and stretched membrane is called eardrum.

25. What is oscillatory motion? Answer: The vibratory motion is also called oscillatory motion.

26. What do you mean by frequency? Answer: The number of oscillations in one second is called frequency.

27. Write the unit of frequency. Answer: The unit of frequency is hertz.

28. Define hertz. Answer: A frequency of one hertz is one oscillation per second.

29. What are the two main properties of a sound which help us to recognise sound? Answer: Amplitude and frequency are the two important properties of sound.

30. Define time period. Answer: The time taken by a vibrating body to complete one oscillation is called time period.

31. On which factor loudness of sound depend? Answer: The loudness of sound depends on the amplitude.

32. What is pitch or shrillness of a sound? Answer: The characteristics of sound which depends on its frequency is called pitch of a sound.

33. What is the hearing range of human ears? Answer: Hearing range of human ears is 20 Hz to 20,000 Hz.

34. What are frequencies of sound which are inaudible? Answer: Less than 20 Hz and more than 20,000 Hz are inaudible.

35. How does the amplitude affect the loudness of voice? Answer: Higher is the amplitude, louder is the voice.

36. Why the sound of a baby is feeble? Answer: The sound of a baby is feeble due to its small amplitude.

37. What frequencies are heard by dogs and cats? Answer: The dogs can hear up to 40,000 Hz frequencies while cats can hear up to 70,000 Hz frequencies.

38. What is ultrasound? Answer: The sound having frequency more than 20,000 Hz is called ultrasound.

39. What is noise? Answer: The loud sound which produces unpleasant sensation is called noise.

40. What do you mean by musical sound? Answer: The sound which produces pleasant sensation is called musical sound.

41. Give examples of noise and musical sound. Answer: The sound in classroom is noise while sound of any musical instrument is musical sound.

42. What do you mean by air pollution? Answer: Presence of unwanted gases and dust particles in air is called air pollution.

43. What is noise pollution? Answer: Presence of excessive or unwanted sounds in environment is called noise pollution.

44. What sources in home may lead to noise? Answer: Television, transistor, radio at high volume, desert coolers and air conditioners are the sources producing noise at home.

45. What is the unit of loudness? Answer: Decibel (dB).

46. What is the loudness of a normal conversation? Answer: 60 dB.

47. Write a common ill effect of noise pollution. Answer: The most common ill effect of noise pollution is temporary deafness.

48. Write any one method to control noise pollution. Answer: To grow more and more plants along the road sides.

Short Answer Type Questions

1: Discuss the importance of sound in our life.

2: How is sound produced?

Answer: Sound is produced by the vibrations of a body and is transmitted through material media in pressure waves made up of alternate condensations (forcing of the molecules of the medium together) and rarefactions (pulling of the molecules of the medium away from one another).

3: How does sound travel from one place to another?

Answer: Sound travels through a medium solid, liquid and gas. It cannot travel through vacuum.

4: Why some sounds are louder than others?

Answer: The loudness of sound depends upon its amplitude. , larger the amplitude of vibration the louder is the sound and vice versa.

5: Explain with an activity that vibrating object produces sound.

Answer: Take metal dish pour water into it, strike its edge with a spoon, you will hear a sound, now again strike the edge of dish and look at the surface of water inside it, you will observe that vibrating dish producing sound along with wave in water. This shows that there is vibration in dish which is producing sound.

6: Vibrating objects produces sound; can we see the vibrations all the time?

Answer: No, we cannot see the vibrations all the time as their amplitude is so small that we cannot see them rather we can feel them.

7: What are vibrating parts of Veena and Tabla?

Answer: Vibrating part of Veena that produces sound is stretched string and Vibrating part of Tabla that produces sound is stretched membrane.

8: What are vibrating parts of Flute?

Answer: Vibrating part of Flute that produces sound is air column.

9: Name some musical instrument which are simply beaten or struck to produce melodious music.

Answer: Manjira, ghatam, not and kartal are some of the instruments that which are simply beaten or struck to produce melodious music.

10: How sound is produced from a guitar?

Answer: The string of the sitar is plucked it vibrate to produce sound, along with string other parts infact the whole instrument is forced to vibrate, and it is the sound of the vibration of the instrument that we hear.

11: Does any part of human body vibrate while speaking or singing a song?

Answer: Yes, while speaking or singing our voice box or larynx which is located at the upper end of the wind pipe vibrates.

12: Why the larynx in human body does vibrate while speaking or singing a song?

Answer: There are two vocal cords which are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air, when the lungs force air through the slit, the vocal cords vibrate producing sound.

13: Explain via an activity that sound travels in liquids.

Answer: Fill a bucket with water and shake a bell under the water with one hand make sure that the bell should not touch the body of the bucket. Now place your ear gently on the water surface, you will hear the sound of the ringing bell, thus we can say that sound can travel through water.

14: Explain via an activity that sound travels in solids.

Answer: Take a metal rod and hold its one end to your ear, ask your friend to tap at the other end of metal rod you will hear the sound of tapping, thus this proves that sound can travels through solid.

15: How water animals communicate in water?

Answer: Sound can travel through liquid. Fill a bucket with water and shake a bell under the water with one hand make sure that the bell should not touch the body of the bucket. Now place your ear gently on the water surface, you will hear the sound of the ringing bell, thus we can say that sound can travel through water.

16: Explain the function of eardrum in human beings.

Answer: The eardrum, or tympanic membrane, is a thin, cone-shaped membrane that separates the external ear from the middle ear in humans, it is like a stretched rubber sheet, sound vibrations make the eardrum vibrate. The ear drum sends vibration to the inner ear and from there signal is send to the brain and in this way we are able to hear the sounds around us.

17: What is eardrum?

18: Explain the functioning of human ear.

19: Why are sound waves called mechanical waves?

Answer: Sound waves force the medium particles to vibrate, because of the interaction of the particles present in that medium.

20: Why there is difference in sound of a baby and an adult?

Answer: The loudness of sound depends upon the amplitude of vibration, when the amplitude of vibration is large sound produced is large and when amplitude of vibration, is low sound produced is feeble. A baby has low amplitude of vibration in their ear drum thus sound produced by baby is low in compare to adults.

21: Name the factor which determines shrillness or pitch of a sound?

Answer: If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

22: Which of the two a drum or a whistle will produce sound with higher pitch and why?

Answer: Whistle will produce sound with higher pitch. If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

23: Which of the two a man or a woman will produce sound with higher pitch and why?

Answer: Woman will produce sound with higher pitch.If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

24: Differentiate between audible and in audible sounds.

Answer: Range of sound between frequencies 20 to 20,000 Hz is called audible sound as sound between these frequencies is easily audible to human beings. But range of sound less than 20 Hz and more than 20,000 Hz is called in audible sound as sound below 20 Hz and more than 20,000 Hz is not audible to human beings.

25: Is there any animal that can hear sound of frequencies higher than 20000 Hz?

Answer: Yes, dog can hear sounds of frequencies higher than 20000Hz, because of this ability of dog it is being used by police for investigation purposes.

26: Name some equipment that works at frequencies higher than 20000 Hz.

Answer: The ultra sound equipment used for tracking and investigating many medical problems works at frequencies higher than 20000 Hz.

27: Define noise along with examples.

Answer: Unpleasant and undesirable sounds are called noise. Example sound produced by horns of vehicles, sound coming from construction sites, sound produced by factories machineries etc.

28: Explain noise pollution and its causes.

Answer: Presence of excessive or unwanted sounds in the environment is called noise pollution, the main causes of noise pollution is the sound made by horns of vehicles, sound coming from construction sites, sound produced by factories machineries etc. in our home sound produced by television, transistor radio at high volume, air conditioner, coolers, some kitchen appliances like pressure cooker etc. contributes to noise pollution.

29: Your friend’s parents are going to buy a house; they have been offered one nearby a factory and another 50 km away from the factory in a less crowdie place. Which house you would suggest your friend’s parents should buy, and why?

Answer: The house that is 50 km away from the factory in a less crowdie place , because house near by the factory will have to face noise pollution because of the industrial machines and also there will be problem of air pollution there.

30: How noise pollution is harmful to human beings?

Answer: Noise pollution can lead to number of health related problems like

Hearing loss
Loss of sleep
Hypertension
Severe headache

31: What is the difference between noise and music, can music become noise sometimes?

Answer: The sound that is pleasing to the ear is called music like sound produced by guitar, piano etc. The sound that is unpleasing to the ear is called noise like sound produced by factories machineries, transport vehicles etc. Yes music can become noise if it is played at high volumes.

32: Define: a. Reverberation of sound b. Echo

Answer: The persistence of sound due to repeated reflection and its gradual fading away is known as reverberation of sound.

Echo: Echo is defined as a repetition of sound due to the reflection of original sound by a large and hard obstacle.

33: What is the intensity of sound?

Answer: The amount of sound energy passing each second through unit area is called the intensity of sound.

34: How is sound produced?

Answer: The vibrating bodies produce the sound. When a body vibrates, sound is produced. If vibrations are stopped the sound is not produced any more.

35: Explain the importance of sound in our daily life.

Answer: Sound play an important role in our daily life. Our life depends on sound for each and every action. Without sound we cannot know what others communicate or want to say. Sound enables us to communicate with each other.

35: What are musical instruments? How do they produce sound?

Answer: The devices which produce various types of sounds which are pleasant to our ears are called musical instruments. Such sound is called music. The musical instruments have strings or the stretched membranes attached or fixed to them. Some instruments have air columns. When these instruments vibrate, the sound is produced.

36: Explain with the help of an activity that vibrating bodies produce sound.

Answer: Take a rubber band, put it around the longer side of a pencil box. Insert two pencils between the box and stretched rubber. Pluck the rubber band somewhere in the middle. You hear a sound and also see that rubber band vibrates. This activity shows that vibrating objects produce sound.

37: Do you see the vibrations in all the cases?

Answer: The vibrating objects produce sound. In some cases the vibrations are easily visible to us. But in most of the cases, the vibrations are not visible due to very small amplitude. But the vibrations in all the cases can be felt.

38: What is ektara? Identify its vibrating part.

Answer: Take a hollow coconut shell or an earthen pot and make a musical instrument. Such instrument is called ektara. Play this instrument, you hear a sound. The stretched rubber band or a wire is its vibrating part.

Class 8 Science Chapter 13 Sound Important Question 1

39: Explain the principle on which Jaltrang works.

Answer: Jaltrang works on the principle that the quality of sound is changed as its frequency changes. Metal tumbler filled with water up to different heights, give vibrations of different frequencies, hence produce different types of sounds.

Class 8 Science Chapter 13 Sound Important Question 2

40: Name the organ in human that produces sound. How does it work?

Answer: In humans, the sound is produced by the voice box or larynx. The voice box has two vocal cords stretched across it, in such a way that it leaves a slit for the passage of air. When the lungs force air through slit, the vocal cords vibrate to produce sound.

41: Prove that sound needs a medium for propagation.

Answer: Take a metal glass tumbler. Place a cellphone in it. Ask your friend to give ring on this cellphone. Listen to the ring carefully. Now surround the rim of the tumbler with your hands. Put your mouth on opening between your hands. Indicate to your friend to give a ring again. Listen the ring while sucking air from the tumbler. The sound become very less. This activity shows that sound requires a medium to propagate.

42: What do you mean by vacuum? What happens to the loudness of sound in vacuum?

Answer: The decreasing amount of air causes decrease in the loudness of sound. When air is removed completely from a vessel, it is said that there is a vacuum. If all the air is sucked from the vessel, the sound would stop completely. The sound cannot travel through a vacuum.

43: Prove that sound can travel through the liquids.

Answer: Take a bucket, fill it with clean water. Take a small bell in one hand. Shake the bell inside the water to produce sound. Place your ear gently on the water surface. You can hear the sound. It indicates that sound can travel through liquids.

44: Prove that sound can travel through solids also.

Answer: Take a long metal rod or a metre scale and hold its one end to your ear. Ask your friend to gently scratch or tap at the other end of the metal rod. You can hear the sound. The sound reaches your ear through the solid rod. The other friends cannot hear the sound because sound is very low. This activity shows that sound travels in solids also.

Class 8 Science Chapter 13 Sound Important Question 3

45: How do human being hear the sounds?

Answer: The hearing organs in humans are ears. Ears have a stretched structure called eardrum. When ears receive sound, it enters down the ear canal and reach eardrum. Vibrations of sound vibrate the eardrum and it sends vibrations to inner ear from which vibrations are sent to brain for interpretation of sound.

46: What do you mean by an oscillatory motion?

Answer: The to and fro motion of the object is called vibration. This motion in either side of the object from its mean position is also called the oscillatory motion.

47: What is frequency? How does it affect the quality of sound?

Answer: The number of oscillations per second is called frequency. Its unit is hertz. A frequency of 1 Hz is one oscillation per second. The frequency determines the shrillness of sound. It is also called pitch of sound. The high frequency makes the pitch high and if the pitch is low, the frequency is less.

48: What are the two important properties of sound?

Answer: (i) Amplitude: It is the maximum displacement from the mean position of an oscillatory body. It controls the loudness of a sound. More the amplitude, more loud the sound is. (ii) Frequency: The Number of oscillations in one second is called frequency. It controls the pitch of the sounds. High pitched sound means high frequency. The unit of frequency is hertz.

49: What do you mean by noise and musical sound?

Answer: Noise: The unpleasant sounds are called noise. It is unwanted sound. It is harmful to our ears. Musical sound: The sound which produces pleasant sensations is called musical sound. It is produced by various musical instruments.

50: What is noise pollution?

Answer: Presence of unwanted and excessive sounds in the environment is called noise pollution. It causes discomfort to us. Excessive sounds are produced by honking of horns, loudspeakers, crackers and machines.

51: How can noise pollution be controlled?

Answer: The noise pollution can be controlled by reducing their sources. The blowing of horns should be avoided in residential areas, near schools or hospitals. The use of loudspeakers should also be avoided. TV and radio should be played at low volumes. Trees should be planted. Trees absorb excessive sounds on the roads.

Long Answer Type Questions

1: Explain the mechanism of hearing in human body.

Answer: Sound plays an important role in our life; Sound helps us to communicate with one another. Sound is so important because animals are able to hear events all around them, no matter where their attention is focused or not. The eardrum, or tympanic membrane, is a thin, cone-shaped membrane that separates the external ear from the middle ear in humans, it is like a stretched rubber sheet, sound vibrations make the eardrum vibrate. The ear drum sends vibration to the inner ear and from there signal is send to the brain and in this way we are able to hear the sounds around us.

2: “Sound travels through a medium, it cannot travel in vacuum”. Justify the statement.

Answer: Sound travels through a medium solid, liquid and gas. It cannot travel through vacuum. Fill a bucket with water and shake a bell under the water with one hand make sure that the bell should not touch the body of the bucket. Now place your ear gently on the water surface, you will hear the sound of the ringing bell, thus we can say that sound can travel through water. Take a metal rod and hold its one end to your ear, ask your friend to tap at the other end of metal rod you will hear the sound of tapping, thus this proves that sound can travels through solid.

3: A pendulum oscillates 50 times in 6 seconds. Find its time period and frequency.

Answer: Frequency of oscillation is defined as the number of oscillation of a vibrating body per second. it is given by

Frequency = no of oscillation/ time period = 50/6 = 8.33 Hz

Time period =1/frequency of oscillation = 1/ 8.33 = 0.12 seconds.

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Sound - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Sound plays an important role in our life; Sound helps us to communicate with one another.Sound is so important because animals are able to hear events all around them, no matter where their attention is focused or not.

Sound is produced by the vibrations of a body and is transmitted through material media in pressure waves made up of alternate condensations (forcing of the molecules of the medium together) and rarefactions (pulling of the molecules of the medium away from one another).

Sound travels through a medium solid, liquid and gas. It cannot travel through vacuum.

The loudness of sound depends upon its amplitude. , larger the amplitude of vibration the louder is the sound and vice versa.

Take metal dish pour water into it, strike its edge with a spoon, you will hear a sound, now again strike the edge of dish and look at the surface of water inside it, you will observe that vibrating dish producing sound along with wave in water. This shows that there is vibration in dish which is producing sound.

Vibrating part of Veena that produces sound is stretched string and Vibrating part of Tabla that produces sound is stretched membrane.

Vibrating part of Flute that produces sound is air column.

Manjira, ghatam, not and kartal are some of the instruments that which are simply beaten or struck to produce melodious music.

The string of the sitar is plucked it vibrate to produce sound, along with string other parts infact the whole instrument is forced to vibrate, and it is the sound of the vibration of the instrument that we hear.

Yes, while speaking or singing our voice box or larynx which is located at the upper end of the wind pipe vibrates.

There are two vocal cords which are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air, when the lungs force air through the slit, the vocal cords vibrate producing sound.

Fill a bucket with water and shake a bell under the water with one hand make sure that the bell should not touch the body of the bucket. Now place your ear gently on the water surface, you will hear the sound of the ringing bell, thus we can say that sound can travel through water.

Take a metal rod and hold its one end to your ear, ask your friend to tap at the other end of metal rod you will hear the sound of tapping, thus this proves that sound can travels through solid.

Sound can travels through liquid.Fill a bucket with water and shake a bell under the water with one hand make sure that the bell should not touch the body of the bucket. Now place your ear gently on the water surface, you will hear the sound of the ringing bell, thus we can say that sound can travel through water.

The eardrum, or tympanic membrane, is a thin, cone-shaped membrane that separates the external ear from the middle ear in humans, it is like a stretched rubber sheet, sound vibrations make the eardrum vibrate. The ear drum sends vibration to the inner ear and from there signal is send to the brain and in this way we are able to hear the sounds around us.

The amplitude of a sound wave is the maximum amount by which the instantaneous sound pressure differs from the ambient pressure.

Two cycles of a sine wave showing the amplitude of the pressure variation.The variation of (maximum) amplitude over time is called the envelope of the sound.

Sound waves force the medium particles to vibrate, because of the interaction of the particles present in that medium.

The loudness of sound depends upon the amplitude of vibration, when the amplitude of vibration is large sound produced is large and when amplitude of vibration, is low sound produced is feeble. A baby has low amplitude of vibration in their ear drum thus sound produced by baby is low in compare to adults.

If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

Whistle will produce sound with higher pitch.If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

Woman will produce sound with higher pitch.If the frequency of vibration is higher the sound has high pitch and if the frequency of vibration is lower the sound has low pitch.

Range of sound between frequencies 20 to 20,000 Hz is called audible sound as sound between these frequencies is easily audible to human beings. But range of sound less than 20 Hz and more than 20,000 Hz is called in audible sound as sound below 20 Hz and more than 20,000 Hz is not audible to human beings.

Yes, dog can hear sounds of frequencies higher than 20000Hz, because of this ability of dog it is being used by police for investigation purposes.

The ultra sound equipment used for tracking and investigating many medical problems works at frequencies higher than 20000 Hz.

Presence of excessive or unwanted sounds in the environment is called noise pollution, the main causes of noise pollution is the sound made by horns of vehicles, sound coming from construction sites, sound produced by factories machineries etc. in our home sound produced by television, transistor radio at high volume, airconditioner, coolers, some kitchen appliances like pressure cooker etc. contributes to noise pollution.

In humans, the sound is produced by the voice box or the larynx. It is the part of throat. It moves when we swallow something.

The house that is 50 km away from the factory in a less crowdie place , because house near by the factory will have to face noise pollution because of the industrial machines and also there will be problem of air pollution there.

Noise pollution can lead to number of health related problems like

Hearing loss
Loss of sleep
Hypertension
Severe headache

The sound that is pleasing to the ear is called music like sound produced by guitar, piano etc.The sound that is unpleasing to the ear is called noise like sound produced by factories machineries, transport vehicles etc. Yes music can become noise if it is played at high volumes.

Reverberation of sound

The persistence of sound due to repeated reflection and its gradual fading away is known as reverberation of sound.

Echo: Echo is defined as a repetition of sound due to the reflection of original sound by a large and hard obstacle.

The amount of sound energy passing each second through unit area is called the intensity of sound.

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CBSE Notes For Class 8
Class 8 Science Notes
Chapter 13: Sound

Sound Class 8 Notes - Chapter 13

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 10.

Sound plays an important role in our life. It is through sound we know that a period in school is over or if someone is approaching you by just listening to the footsteps. Vibrating objects produce sound. Vibration is the to-and-fro or back-and-forth movement of an object. Sound needs a medium to travel. Hence, it cannot travel in a vacuum.

For more information on Sound, watch the below video

Introduction to Sound

Introduction to waves.

The sound is produced by vibrating objects.
They travel from one place to another in the form of waves. Hence, the name sound waves.

Wave and particle motion of waves

Mechanical waves are waves that travel through a material medium.
It is of two types: depending on the direction of motion of the particle of the medium and the wave propagation:

Transverse waves

Particle motion is to perpendicular the direction of wave motion.
This type of wave is a mechanical wave called a transverse wave. For example, light or even Mexican wave in a stadium.

Longitudinal waves

When the particles of the medium travel parallel to the direction of the wave motion by means of successive compression or rarefaction.
It is also a mechanical wave.
Example: a slinky

To know more about Sound Waves, visit here .

Sound Properties

Introduction to sound waves.

– Sound needs a medium to propagate. The matter or material through which sounds propagates is called a medium. – Sound cannot travel in a vacuum. The moon does not have an atmosphere. Hence, you can hear on the moon.

For more information on Properties of Sound, watch the below video

Sounds by Humans

How do humans produce sound.

The sound produced in the voice box is called the larynx, located at the upper end of the windpipe.
2 vocal cords get stretched across in the voice box. Has a slit through which air is forced out by the lungs.
Muscles attached to vocal cords make them tight or loose.
Outer ear = pinna: collects sound from the surroundings.
Sound passes through a tube called an auditory canal.
Eardrum (tympanic membrane) → vibrates when the sound incident.
Vibrations are sent to the inner ear, and from there, it goes to the brain as signals via the auditory nerve.

To know more about Human Ear, visit here .

Amplitude, Time Period and Frequency

Amplitude, frequency and time period of vibrations.

The magnitude of disturbance in the medium on either side of the mean value is called as Amplitude (A). Larger the amplitude, the louder the sound.
The number of oscillations per second is called frequency. Expressed in Hertz (Hz).
Time taken for one complete oscillation to travel across a point. T = 1/f. (Seconds)

For more information on Characteristics of Sound Waves, watch the below videos

Loudness and Pitch

Volume or loudness of a sound depends on the amplitude. The force with which an object is made to vibrate gives the loudness.
The number of oscillations per unit time. Directly proportional to frequency.

Audible and inaudible sounds

Audible range = 20Hz to 20kHz known as the Sonic range.
Below 20 Hz (inaudible) → infrasonic range
Above 20 kHz (inaudible) → Ultrasonic range

To know more about “Characteristics of Sound Waves”, visit here .

Noise Pollution

Noise and music.

Noise pollution and measures to control it

To know more about Noise Pollution, visit here .

Learn more about sound and its properties and other related topics, including CBSE class 8 Science notes , at BYJU’S.

Frequently Asked Questions on CBSE Class 8 Science Notes Chapter 13 Sound

What are transverse waves.

Transverse wave is where the motion in all points on a wave oscillates along paths at right angles to the direction of the wave’s advance.

What is the definition of Amplitude?

The definition of amplitude refers to the length and width of waves, such as sound waves, as they move or vibrate.

What are some ways to control Noise pollution?

1. Turn off unnecessary appliances 2. Use earplugs 3. Follow limits of noise level

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There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

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CBSE Class 8 Science Case Study Question

Chapter 1 Crop Production and Management Case Study Question
Chapter 2 Microorganisms: Friend and Foe Case Study Question
Chapter 3 Synthetic Fibres and Plastics Case Study Question
Chapter 4 Materials: Metals and Non-Metals Case Study Question
Chapter 5 Coal and Petroleum Case Study Question
Chapter 6 Combustion and Flame Case Study Question
Chapter 7 Conservation of Plants and Animals Case Study Question
Chapter 8 Cell – Structure and Functions Case Study Question
Chapter 9 Reproduction in Animals Case Study Question
Chapter 10 Reaching the Age of Adolescence Case Study Question
Chapter 11 Force and Pressure Case Study Question
Chapter 12 Friction Case Study Question
Chapter 13 Sound Case Study Question
Chapter 14 Chemical Effects of Electric Current Case Study Question
Chapter 15 Some Natural Phenomena Case Study Question
Chapter 16 Light Case Study Question
Chapter 17 Stars and the Solar System Case Study Question
Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

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Case Study Questions for Class 8 Science Chapter 13 Sound
Here we are providing case study questions for CBSE Class 8 Science Chapter 13 Sound. Case Study Questions. Question 1: Sound plays an important role in our life. It is a form of energy which makes us hear . Vibrating objects produce sound.
CBSE Class 8
Sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Hence, the sound is a wave. Sound is produced by vibrating objects. Vibration can be described as to and fro motion of an objects. Sound cannot be produced without any vibrations. Sound always requires a medium to travel from the source of its production to the receiver end. Speed of the ...
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So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science chapter 10 Sound.
NCERT Solutions for Class 8 Science Chapter 13 Sound
NCERT Solutions for Class 8 Science Chapter 13 Sound Topics and Sub Topics in Class 8 Science Chapter 13 Sound: Section Name Topic Name 13 Sound 13.1 Sound is Produced by a Vibrating Body 13.2 Sound Produced by Humans 13.3 Sound Needs a Medium for Propagation 13.4 We Hear Sound through Our Ears 13.5 Amplitude, Time […]
Sound CBSE Class 8 Science Revision Notes Chapter 13
Get Revision notes of Class 8 th Science Chapter 13 Sound to score good marks in your Exams. Our notes of Chapter 13 Sound are prepared by Maths experts in an easy to remember format, covering all syllabus of CBSE, KVPY, NTSE, Olympiads, NCERT & other Competitive Exams.
NCERT Solutions for Class 8 Science Chapter 13 Sound
NCERT Solutions for Class 8 Science Chapter 13 Sound renders students with accurate solutions to all the exercises and in-text questions provided in the NCERT Class 8 textbook that aligns with the CBSE Board. Here, students are provided with the ultimate study material, the NCERT Class 8 Solutions, which are executed by a team of subject-matter ...
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The CBSE important questions of Chapter Sound Class 8 have been set, keeping in mind the board's syllabus and question pattern. Professionals set Class 8 Science Sound important questions after thorough and careful evaluation of the chapter. There are MCQ-type questions along with concise type, short type, and long type. NCERT Class 8 Science Chapter 13 essential questions are also included ...
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Sound Class 8 Extra Questions Science Chapter 13
Sound Class 8 Extra Questions Science Chapter 13 Sound Class 8 Extra Questions Very Short Answer Questions Question 1. What does voice box or larynx of human produces? Answer: Sound Question 2. In which medium sound propagates the maximum? Answer: Solid Question 3. Name the sound producing organ in human. Answer: Larynx Question 4. What […]
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NCERT Exemplar Class 8 Science Chapter 13 Sound
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Here you can get Class 8 Important Questions Science based on NCERT Text book for Class 8. Science Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Sound for Class 8 Science subject.
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Short Q&A: Q1: Discuss the importance of sound in our life. Q2: How is sound produced? Q3: How does sound travel from one place to another? Q4: Why some sounds are louder than others? Q5: Explain with an activity that vibrating object produces sound.
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In Class 8 Chapter 13 Sound Notes, the properties of sound and how sound is perceived by humans are discussed. Also, provided here is the extra questions for the chapter.
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CBSE 8th Standard CBSE all question papers, important notes , study materials , Previuous Year questions, Syllabus and exam patterns. Free 8th Standard CBSE all books and syllabus online. Practice Online test for free in QB365 Study Material. Important keywords, Case Study Questions and Solutions. Updates about latest education news and Scholorships in one place.
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Himachal State Exams. Delhi State Exams. Uttarakhand State Exams. Punjab State Exams. J&K State Exams. Questions Bank. 8th Class. Science.
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