Register online for Science tuition on Vedantu.com to score more marks in your examination. Top. “Sound needs a medium for propagation”. Answer: Can music become noise sometimes,? 3. Next Prev Home. a) 200-2000 Hz. } Answer: Define frequency. https://byjus.com/cbse-notes/cbse-class-8-science-notes-chapter-13-sound (b) Decibel (c) Ultrasonic Identify the part which vibrates to produce sound in the following instruments. The outer and middle ears mostly collect and transmit sound. If the amplitude increases three times, the loudness will increase by a factor of 9. (b), Question 8. How is that you can hear a friend talking in another room without seeing him ? Bats produce ultrasonic sound during screaming. On striking the metal dish we hear sound and on touching it we feel the dish vibrating. What happens to sound when it strikes a surface ? To show that sound needs a medium to travel, let us take an example-. Answer: Sound Question 2. Decibel (dB) is the unit used to measure the intensity of a sound. How are we able to hear sound ? (a) occur together and are also observed together. At Study Path, you can download PDF of Multiple Choice Questions for Class 8 Chapter 13 Sound with Answers. (c) only through gases and solids When we pluck the strings of a sitar, the whole instrument vibrates and the sound is heard. Draw a labelled diagram showing the structure of the human ear. Class 6 - Class 7 - Class 8 - Class 9 Class 10 - Class 11 - Class 12. Answer: The pitch of sound depends on which of the following? Sound can travel through all 3 states of matter that is solids, liquids and gases. Which animal can hear sounds of frequencies higher than 20,000 Hz ? In 6 seconds, pendulum makes  – 50 oscillations, In 1 second, pendulum makes –  50/6 = 25/3 oscillations, Thus, the frequency of this pendulum is 25/3. Today Maggy has a great sound science experiments to show us. Answer: Larynx Question 4. 3. Question 1. (ii) Sound helps us communicate with each other. In which medium sound propagates the maximum? EVERYONE is doing it now, be it in Science Hangouts or just having fun with the kids at home. Answer: Question 3. Answer: From there, the signal goes to the brain and we are able to hear. Is there a hint to connect sound with the vibrations of a body? On a stormy day, we usually see the lightning first and thunder is heard later because in air, the speed of light is faster as compared to the speed of sound. Find its time period and frequency? Question 19. Sound waves do not travel through which of the following? Make sure that it is dry. When does a thud become music ? NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. The tightly stretching rubber string, when plucked in the middle, shows a fast to and fro motion. Thus, all vibrating bodies produce sound. Register online for Science tuition on Vedantu.com to score more marks in your examination. Once the ear drum vibrates, it passes vibrations to 3 interlocked bones of middle ear which further increases the amplitude of vibrations. Study what makes a vibrating body produce sound, its characteristics and what factors control its speed and loudness. It is collected by ear pinna and it directs into ear canal where it travels and hits the ear drum. Answer: The speed of sound is more on a humid day as compared to a dry day because on a humid day, particles are comparatively closer, so, the transfer of energy occurs faster. When we hold the pan tightly after striking it, we do not hear the sound. 1 hertz is equal to (a) 1 vibration per minute (b) 10 vibrations per minute In our body which part of the ear receives sound waves ? These instruments struck themselves as they include vibrating membranes as used in drums of various kinds. Sound can travel in all directions and around comers. Why are we not able to hear the screams of a bat? While some of these sounds may be pleasant and soothing, some could be annoying. of the vibrating body which produces sound. Do you see any waves there? Define 1 hertz. NCERT Solutions Class 8 Science Chapter 13 Sound. The to and fro motion of an object is known as oscillatory motion. They do not require medium for their propagation. We can also say that the amplitude of a sound wave is the height of the crest or tough. Explain how the sound travels. Time to check your knowledge by answering the following questions-, Mark the following statements as true or false-. What is meant by oscillatory motion ? Let us suppose if there is any marriage party going on in our surroundings and they use loud speakers. d) 2000-200000 Hz 9 An ultrasound equipment works at frequency. Question: Lightning and thunder take place in the sky at the same time and at the same distance from us. The middle ear is an air-filled cavity. Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. We can also say that it is a. form of energy and it comes from vibrations. 1 hertz is equal to (a) 1 vibration per minute (b) 10 vibrations per minute Compressions are the regions of high pressure and density where the particles are crowded and are represented by the upper portion of the curve called crest. Your No1 source for Latest Entrance Exams, Admission info, February 9, 2019 by SuccessCDs Team in CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers. Top. We should plant trees along roads and buildings. What is the time period of the vibration ? A soft board will………………… most of the sound falling on it. A sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Like in a dark room where there is no light and  100 people are present, we can easily recognize the sound of our friend among all the people due to the particular quality of its sound. Light waves are transversal waves. Presentation of science (sound) 1. (b) Baby boy ∴ No. Answer: Question 14. They have been offered one on the roadside and another three lanes away from the roadside. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. Activity 3 (NCERT Textbook, Page 758-759) Time taken for 500 vibrations = 1 second The amplitude of a sound determines its volume (loudness). Sonogram is not harmful and is therefore used for studying the foetus or stone or tumor in the organs. Number of vibrations per second = 500. Strike all of them in succession. Very Short Answer Type Questions. Explain the sound wave in terms of amplitude and wavelength. NCERT Solutions for Class 8 Science Sound Class 8 Science book solutions are available in PDF format for free download. While some of these sounds may be pleasant and soothing, some could be annoying. Speed of sound depends upon the density (density is defined as mass per unit volume) of medium (it increases with increase in density of mediums). These vibrations create sound waves which move through medium such as air and water before reaching our ears. Top. Solving the Sound Multiple Choice Questions of Class 8 Science Chapter 13 MCQ can be of extreme help as you will be aware of all the concepts. Compare the amplitudes of vibrations of the tumbler in the two cases. Active Science Solutions for Class 8 Science Chapter 11 Sound are provided here with simple step-by-step explanations. c) 2-20000 Hz. A frequency of 1 hertz means one oscillation per second. Also, we find that the band is vibrating. (b) Anxiety : a baby’s voice has more frequency and thereby, it is shriller than an adult’s voice. Students can revise the Class 8 Science chapter Sound solutions before sitting in the exams. This activity shows that vocal cords also produce sound in a similar manner when they vibrate. These particles after collision further collide with other particles and this continues in form of a chain carrying the energy until the energy of particles becomes too feeble to collide further and propagate the sound. Question 16. It is at the upper end of the windpipe. It is used for relaxation and for enjoyment. The unwanted and excessive sound in our environment creates noise pollution. : Let us compare speed of sound and speed of light in air? (c) occur together but the thunder is observed a little after the lightning. Yes, we find that we can hear the sound of the scratch. The vibrating body causes the medium (water, air, etc.) Solution: It is a measure of the intensity of the sound. So Lightning is seen earlier and thunder is heard later. Class 8 Science Chapter 13 Sound MCQ (Multiple Choice Questions) with Answers is available here in PDF format. Again strike the plate with the stick and hold it tightly with your hands immediately after striking. Top. It is measured in unit ‘decibel’. Topic : Sound Made by : Kunal Aggarwal Class : IX B Roll No. Children have very short vocal cords. Light travels faster than sound. In dish washing machines where water and detergent are vibrate with ultrasonic vibrators. Identify the part which vibrates to produce sound in the following instruments. Question 2: What is vibration? The pitch of sound depends on the which of the following of the vibrating body? Can you explain why? These all instruments are bowed to produce sound of different pitches. The speed of sound in solids is the speed of sound in liquids. It includes three interlocked bones: the malleus (or hammer), incus (or anvil), and stapes (or stirrup). You already know about air pollution. It is defined as the contamination of air with unpleasant and irritable effect. A pendulum oscillates 40 times in 4 seconds. The lesson covers all important questions and NCERT solutions to book questions have also been provided for convenience of the students. Answer: It is defined as the contamination of air with unpleasant and irritable effect. 2. Answer: 2. List sources of noise pollution in your surroundings. Lightning is seen earlier and thunder is heard later. We cannot hear the sound of the exploding meteors in the sky, though we can see them. Take a metre scale ora long metal rod and hold its one end to your ear. Whales and dolphins are able to communicate in liquids as sound can travel through liquids. As the air blows through the stretched rubber strips, a sound is produced. Question 2. Answer: Rarefactions are the regions of low pressure and density where the particles are spread out and are represented by the lower portion of the curve called trough. We observed that sound becomes fainter than earlier when we try to suck air. Noise, It is defined as the sound that is unpleasant and has an irritating effect. Top. Areas of high and low pressure move outwards creating a form of longitudinal wave (a wave which vibrates in the direction of travel). On receiving the vibrations its fluid also starts vibrating and  sensory cells present in them transform the vibrations into electrical signals which are carried by auditory nerve to brain for interpretation and understanding. They are received back after reflection from the sea bed. In which of the following sound propagates maximum ? What happens when we pluck the strings of a sitar ? That is the reason that females and males have different sounds. Now place your ear gently on water surface. Answer: Sound propagates by causing the particles in the medium to vibrate. Year 8 Science - Light and Sound DRAFT. Double bass: Double bass produces the sound of lowest pitch. It is  used for investigation purpose. 4. Like sparrow, lion, elephant all of them have different sounds. Can you explain why ? CBSE Class 8 Science Sound Worksheets with Answers for Chapter 13 in PDF format to download prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Let us conduct an activity to show that sound can travel through liquids. Place these two pieces one above the other and stretch them tight. The number of vibrations completed in one second is known as …………. Listen to the ring while sucking air from the tumbler. Make sure that the bell does not touch the body of the bucket or the tub. Vibration of an object is the necessary condition for the production of sound. Whose voice has a higher frequency – man or woman ? Now, surround the rim of the tumbler with your hands (Fig. (b) occur one after the other but are observed together. Use of ultrasound in medicine : Question 5. These are called. : 16 Subject : Science 2. Inner ear consists of eustachian tube. Answer: One of the first and most obvious biological differences between men and women’s speech is the pitch. The sound which is unpleasant for our ears is called noise while music is the sound which is pleasant for our ears. 2. Compressions are the regions of high pressure and density where the particles are crowded and. But, the people standing around us cannot hear the same sound or we can say that it is limping not audible to them. When we throw a stone in any water body, like pond or lake, we see ripples and this stone hinders the particles of water due to which disturbances occur in a wide range at a regular interval of time. Question 18. 8. Justify the statement. Amplitude is the maximum displacement of a particle from its mean position in either direction. It is the wave in which particles vibrate up and down. The amplitude of vibration of the tumbler is larger when the glass is struck hard.Thus the loudness of sound depends upon the amplitude of vibration. Answer: The sound which is pleasing for the ear are called _____ (a) Lonely sound (b) Solo sound (c) Echo (d) Musical sound. It includes three interlocked bones: The sound which is pleasing to the ear called _______sound. d) 2000-200000 Hz 9 An ultrasound equipment works at frequency. The instruments with plucked strings have varied lengths. Answer: Sound gets reflected on striking a surface. Sound is produced only when the source of sound vibrates (Oscillates) at its mean position in to and fro direction. - Phys Sci. A pendulum oscillates 50 times in 6 seconds. There are different sources of noise pollution which includes. The vibrating body is Educational Study Material. Question 1. “Sound travels through a medium, it cannot travel in a vacuum”. Take a hollow coconut shell and make a musical instrument ektara. What is the difference between noise and music? When lung force air through the slit, the vocal cords vibrate, producing sound. Tt can damage the eardrum and make a person deaf. These instruments are mainly made of brass and wood but sometimes they can be made of silver. Your email address will not be published. Science - Class 8 / Grade 8 (Chapter 11 - 18) Chapter 13 – Sound – 1 NCERT Solutions for Class 8 Science PDF free download, NCERT Solutions for Class 8 Science Chapter 13 Sound, to Study online or download free in PDF form. Does it indicate that sound can travel through liquids? Then we need to shake the bell inside water to produce sound. Lightning is seen earlier and thunder is heard later. 5. Question: State the functions of the human ear. Now ask your friend to speak”Hurrey, Hurrey”from the open end (Fig. This is your Jaltarang (Fig. (ii) The motion of materials or objects […] Calculate the speed of sound. Copyright © 2021 - 2021 (c) Amplitude Now hold the dish. What are vocal cords ? Violin: Violin produces the sound of highest pitch. (d) Wavelength The supersonic jet planes fly in the air. 13.8). 4. (a) Amplitude The sound of these frequencies is inaudible. Now strike it with a stick (Fig. It is the property by which one can distinguish between two different sounds of same pitch and loudness. (d) solids, liquids, and gases. Alternatively, a downward movement in wave is called as trough or a depression in wave is said to be trough. The voice of woman has higher frequency. Question 12. Answer: (d) solids, liquids, and gases Justify with an experiment. Answer: Question 4. 7. The speed of light is more than that of the speed of sound. But all these are known as sounds. You already know about air pollution. If not why ? Educational Study Material. Question 21. Answer: Following are some of the characteristics of sound: Sound produced by man is through a voice box called larynx, it consists of two flap – like ligaments called vocal cords with a narrow slit spacing them. Since sound can travel through air, we can hear then flying. Question 20. 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. Question: Let us compare speed of sound and speed of light in air? (T/F), Time taken by an object to complete one oscillation is called …………. 2. Speed of sound is maximum in solids and least in gases as particles are closer in solids. The worksheets are useful for KS3 students, especially Year 8 students to revise and master the topic. Touch the plate after it stops producing sound. Sound can travel through, Question 2. Now bang the spoon on the tumbler and hear the sound produced again. Can you explain why? Answer: As we know that the number of oscillations made by a pendulum in 1 second is called its frequency. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. 13.6(b)]. what is the frequency of the pendulum? Vibrations of sound vibrate the ear drum. (c) Seconds Justify the statement. Then finally, when there is no air left inside, we will be unable to hear the sound of the bell or we can say that it will stop ringing. Can sound travel through water ? In the following statements, tick ‘T’ against those which are true and ‘F’ against those which are false. Can you hear the sound of the bell? No. I would suggest my parents buy a house three lanes away from the roadside because house on the roadside would be much noisy in both days and night due to running vehicles. We cannot hear the sound on the moon because sound requires a material medium to travel. Can music become noise sometimes? Question 20. They do not require medium for their propagation. Do you feel the vibrations? More is the amplitude, louder is the sound. Answer: More the frequency, more the voice is shrilled. 1. Voice of which of the following is likely to have minimum frequency ? Your parents are going to buy a house. a) Higher than 20,000 Hz. Receiver is the one who can hear the sound. Strike the tablespoon gently at the brim of the tumbler. compresses the air in front of it, forming a region of high pressure called compression (C). : Why speed of sound is more on a humid day as compared to a dry day? SONAR is used to measure the depth of the ocean. How can we control the sources of noise pollution ? Two vocal cords are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for passage of air (Fig. A coiled organ filled with fluid (Cochlea). Answer: To examplify, when a vibrating object moves forward, it pushes and compresses the air in front of it, forming a region of high pressure called compression (C). Time taken by an object to complete one oscillation is called _______. If the amplitude of vibration is large, the sound is feeble. disturbance. When we speak, air is forced out (exhaled). But if you bring that tunning fork near a hanging bell, then the bell shows an oscillatory motion. Length of vocal cord in males is 20mm and females is 15mm. Question 5. Solution: 6. Question: Why astronomers fail to hear the sound of each other on the surface of the moon? These solutions for Sound are extremely popular among Class 8 students for Science Sound Solutions come handy for quickly completing your homework and preparing for exams. Noise pollution leads to lack of sleep. On the moon there is no atmosphere and sound cannot travel in vacuum. What is the length of vocal cords in men ? Its unit is centimetre (cm). Then, we will not be able to sleep due to extremely high sound of speakers. 10 vibrations in 1 second Make sure it does not touch the body of bucket. It is that wave which needs a medium to travel. Question 8. Thus, we can conclude that vibrating body produces sound. Sound having frequency higher than 20kHz is known as ultrasound, is used for. In the following statements, tick ‘T’ against those which are true and ‘F’ against those which are false. We have also heard a variety of sounds from sitar, violin, veena, ringing of temple bells, chirping of birds, vehicles honking in traffic, dogs barking, pressure cooker whistling, crackers bursting, rattling and breaking of objects. } ∴ Time period = 1/500 second. The book is available in all English, Hindi & Urdu Medium. Loudness is proportional to the square of the amplitude. [NCT 2011, NCERT] Ultrasonic waves are sent from the ship down into the sea. How do plants help in reducing noise pollution ? We can also say that the amplitude of a sound wave is the height of the crest or tough. Dogs have the ability to hear it but humans cannot. Question 6. Stretch a piece of rubber balloon across one end of the can and fasten it with a rubber band. Who has a high pitched sound, a man or a woman? In which case is the amplitude larger? Sound is produced when something vibrates. What is meant by base loudness level ? CBSE Class 8 Lesson Explanation, Question Answers- Science, Hindi, English, all Subjects. (ii) The motion of materials or objects […] Answer: How is the pressure variation in a sound wave amplified in human ear ? (c) A man. Middle part: The middle ear is an air-filled cavity. Practising these MCQs will help you to answer every question that is being asked in the exams. ∴ Time period = 1/10 sec. NCERT Books for Class 8 Science – English Medium. Lightning and thunder take place in the sky at the same time and at the same distance from us. It is defined as the number of sound waves produced per second. The upward movement is known as crest or an elevation is called as crest. Question 2. c) Lower than 20,000 Hz. Question: What are the three characteristics of sound? This happens because the speed of sound is much greater than the speed of the car. Lovely to be visiting Science Sparks again. For example: S. ound of a horn, sound near the site of construction work, sound of an aeroplane, etc. The larynx has a pair of membranes known as vocal cords stretched across their length. A sound produced can be either music or a noise to our ears. This wave does not pass through vacuum. Question 11. Jake a rubber band. Answer: These are the special whistles that produce sound of frequency higher than 20,000 Hertz. 1. What change do you observe on the surface of water? Answer: Solid Question 3. What is the hearing range of human ear? NCERT Books - Question Answers Voice of which of the following is likely to have a minimum frequency? Why do the grain jump up and down? [NCERT] Longitudinal waves further consist of two regions: It is a region where particles are closer to each other. One of the first and most obvious biological differences between men and women’s speech is the pitch. Solution: Shake this bell inside the water to produce sound. is proportional to the square of amplitude. Answer: 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 […] Identify laboratory tools What is the time period of the vibration? Lightning is seen earlier and thunder is heard later. It is the wave in which particles vibrate up and down. 6th - 9th grade. Activity 1 (NCERT Textbook, Page 158) Question 6. In this chapter, the students will learn, how sound is produced by a vibrating body, sound produced by humans, how sound propagates through, air and water. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. If the frequency of a sound is below 20 Hz, will it be audible to human beings ? MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Samacheer Kalvi 9th Science Sound Additional Questions. Dogs can hear frequencies higher than 20,000 Hz. Not sure where to start? What is the basic principle of its working ? ... and skills students may need extra support in applying as these concepts are fundamental to students engaging in Science and Engineering Practices like analyzing and interpreting data as well as using mathematical and computational thinking. 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Vibration of an object is the necessary condition for the production of sound. Question 13. The outer ear is the most external portion of the ear called the pinna or auricle, the ear canal. The vibrations of a simple pendulum are also known as ………………. Take 6-8 bowls or tumblers. Extreme or loud sounds cause impairment of hearing. d) No relation between amplitude and sound 8 Human can hear sound in the range of. Do you hear any sound? TV, music system should be operated at low volume. The worksheets are useful for KS3 students, especially Year 8 students to revise and master the topic. The number of oscillations per second of a vibrating object is called its time period. Look at the surface of water. Shrillness of a sound is determined by the …………….. of vibration. (T/F), Noise pollution may cause partial hearing impairment. CBSE Notes - NCERT Solutions. are represented by the upper portion of the curve called crest. It produces pleasant sound. 1. Answer: Wave is defined as a periodic disturbance in a medium (air, water, and gas) that transfers energy from one particle to another. Thus, we find that shorter the length of the vibrating air column, higher is the pitch of the sound produced. Due to more speed the light reaches us before the sound does. 13.3). Sound Class 8 Extra Questions Science Chapter 13 Sound Class 8 Extra Questions Very Short Answer Questions Question 1. CBSE 8 Science Chapter 13 Sound; CBSE 8 Science Chapter 14 Chemical Effects of Electric Current; CBSE 8 Science Chapter 15 Some Natural Phenomena; CBSE 8 Science Chapter 16 Light; CBSE 8 Science Chapter 17 Stars and the Solar System; CBSE 8 Science Chapter 18 Pollution of Air and Water; Noise Pollution. I. If a person is exposed to noise continuously he may get temporary or permanent deafness. The speed of light is more than that of sound. Larynx is also known as voice box. Question 16. This is the reason why the voices of men, women and children are different. And …………. Learn about the properties of sound waves and how we calculate the speed of sound with BBC Bitesize KS3 Science. a) Higher than 20,000 Hz. [NCERT]. When we touch the pan gently with our finger after striking we feel the vibration. Noise producing industries, airports, bus and transport terminals and railway stations to be located far from residential areas. Required fields are marked *, About | Privacy Policy | Disclaimer | Sitemap. Strike the dish again. d) Lower than 10,000 Hz 10 Voice of man is heavy compared to a woman because Again strike the dish and then touch it. This is partly because men are normally larger than women (sexual dimorphism), which means their vocal folds are larger. The lesser the amplitude of vibration, the sound gets feeble. Answer: Sound needs a material like air, water, steel, etc. Answer: 70% average accuracy. Ear drum sends vibrations to inner ear from which vibrations are sent to brain for interpretation of sound. We can hear the sound of the bell which indicates that sound can travel through liquids. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Sound. (d) Human beings can hear a sound if its vibrations are within the frequency range of 20 Hz to 20 kHz. Played 323 times. What is the difference between noise and music? Fill them with water upto different levels, increasing gradually from one end to the other. 4. It is a region where particle are far from each other. Top, It is the distance between two consecutive crests or troughs.

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