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science 8 sound

Topics covered are sound, types of sound, sound as wave and wave types. inside our ears because they can hurt the eardrum and can make a person completely deaf. Top. } (b) only through gases and liquids Question 6. Define 1 hertz. (ii) Sound helps us communicate with each other. These MCQ Questions on Sound Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. In humans, sound is produced by the voice box or larynx. Question 19. Answer: 1 hertz is equal to (a) 1 vibration per minute (b) 10 vibrations per minute It is, Outer part: It consist of ear pinna, auditory canal, and ear drum. The eardrum is like a stretched rubber sheet. There are two types of sound which are as follows: It is the sound that gives pleasant effect or soothing effect. Less the frequency, deep is the sound. Here you can get Class 8 Important Questions Science based on NCERT Text book for Class VIII. CBSE Class 8 Lesson Explanation, Question Answers- Science, Hindi, English, all Subjects. It is a characteristic of sound, the degree of sensation of sound. Double bass: Double bass produces the sound of lowest pitch. Put four or five grains of dry cereal on the stretched rubber. Sound is a form of energy that produces sensation of hearing. 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. Understand the properties of sound waves. Remove the tumbler from your mouth. Yes, we hear the sound on plucking the rubber band. The supersonic jet planes fly in the air. Let us suppose if there is any marriage party going on in our surroundings and they use loud speakers. Answer: Question 13. Explain the sound wave in terms of amplitude and wavelength. Can you explain the change? Ear drum sends vibrations to inner ear from which vibrations are sent to brain for interpretation of sound. Answer: For example: These instruments struck themselves as they include vibrating membranes as used in drums of various kinds. Topics and Sub Topics in Class 8 Science Chapter 13 Sound: Question 1. Answer: The sound which is unpleasant for our ears is called noise while music is the sound which is pleasant for our ears. Explain in what way noise pollution is harmful to humans. Now, pluck the rubber band somewhere in the middle. Your email address will not be published. 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. Now, strike the tumbler gently and then with some force. It depends upon the nature of the medium through which it passes. (b) solids only The third most important source is receiver. Answer: (d) None of these Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. Question 20. 4 years ago. Sketch larynx and explain its function in your own words. 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Sound travels faster in a hot medium, or in a solid. Samacheer Kalvi 9th Science Sound Additional Questions. We can see vibrations in ringing bell but not in case of playing harmonium. So Lightning is seen earlier and thunder is heard later. Bats produce ultrasonic sound during screaming. Download CBSE Class 8 Science Sound worksheets for free in PDF format from UrbanPro. Why are we not able to hear the screams of a bat? Music is a sound which produces a pleasing sensation. Sound: (i) Sound is a form of energy like heat energy, light energy, potential energy and kinetic energy. Calculate the speed of sound. SCIENCE OF SOUND 'SCIENCE OF SOUND' is a 14 letter phrase starting with S and ending with D Crossword clues for 'SCIENCE OF SOUND' Clue Answer; Science of sound (9) ACOUSTICS: Sound properties (9) Synonyms, crossword answers and other related words for SCIENCE OF SOUND [acoustics] Noise pollution causes: The pitch of sound depends on which of the following? Sound can be produced by beating an object irrespective of whether these are vibrating or not. : a baby’s voice has more frequency and thereby, it is shriller than an adult’s voice. Answer: Sound needs a material like air, water, steel, etc. Your parents are going to buy a house. Answer: Question 14. For example: Flute, Shehnai, Been. So Lightning is seen earlier and thunder is heard later. It is measured in unit ‘decibel’. Question: How whales and dolphins are able to communicate? Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Sound. CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers, ← Force and Pressure Class 8 Notes, Question Answers, Explanation, Chemical Effects of Electric Current Class 8 Notes, Question Answers, Explanation →, Chapter 1 How, When and Where Class 8 History Explanation, Question Answers, Chapter 2 From Trade to Territory – The company establishes power Class 8 History, Explanation, Question Answers, Chapter 3 Ruling the Countryside Class 8 History Explanation, Question and Answers, Chapter 4 Tribals, Dikus and the Vision of a Golden Age Class 8 History Explanation, Chapter 5 When people rebel – 1857 and after Class 8 History Explanation, Chapter 6 Weavers Iron Smelters and Factory Owners Class 8 History, Explanation, Chapter 1 The Indian Constitution, Class 8 Civics Explanation, Question and Answers, Chapter 2 Understanding Secularism, Class 8 Civics Explanation, Question and Answers, Chapter 3 Why do we need a Parliament, Class 8 Civics Explanation, Question and Answers, Chapter 4 Understanding laws, Class 8 Civics Explanation, Question and Answers, Chapter 5 Judiciary Class 8 Civics Explanation, Question and Answers, Chapter 6 Understanding Our Criminal Justice System Class 8 Civics Explanation, Question and Answers, Chapter 7 Understanding Marginalization, Class 8 Civics Explanation, Question and Answers, Chapter 8 Confronting Marginalisation, Class 8 Civics Explanation, Question and Answers, Chapter 9 Public Facilities, Class 8 Civics Explanation, Question and Answers, Chapter 10 Law and Social Justice, Class 8 Civics Explanation, Question and Answers, Chapter 1 Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources, Class 8 Geography Lesson Explanation, Question and Answers, Chapter 3 Mineral and Power Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 4 Agriculture, Class 8 Geography lesson Explanation, Question and Answers, Chapter 5 Industries, Class 8 Geography lesson Explanation, Question and Answers, Chapter 6 Human Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 1 Crop Production and Management Class 8 CBSE Science Notes, Question Answers, Chapter 2 Microorganisms Class 8 Notes, Question Answers, Chapter 3 Synthetic fibres and Plastics Class 8 Notes, Question Answers, Chapter 4 Metals and Non Metals Class 8 Notes, Question Answers, Chapter 5 Coal and Petroleum Class 8 Notes, Question Answers, Chapter 6 Combustion and Flame Class 8 Notes, Question Answers, Chapter 7 Conservation of plants and animals Class 8 Notes, Question Answers, Chapter 8 Cell Structure and Function Class 8 Notes, Question Answers, Chapter 9 Reproduction Class 8 Notes, Question Answers, Explanation, Chapter 10 Reaching the age of adolescence Class 8 Notes, Question Answers, Explanation, Chapter 11 Force and Pressure Class 8 Notes, Question Answers, Explanation, Chapter 12 Friction Class 8 Notes, Question Answers, Explanation, Chapter 13 Sound Class 8 Notes, Question Answers, Explanation, Chapter 14 Chemical Effects of Electric Current Class 8 Notes, Question Answers, Explanation, Chapter 15 Some Natural Phenomena Class 8 Notes, Question Answers, Explanation, Chapter 16 Light Class 8 Notes, Question Answers, Explanation, Chapter 17 Stars and the Solar System Class 8 Explanation, Notes, Examples, Question Answers, Chapter 18 Pollution of Air and Water Class 8 Explanation, Notes, Examples, Question Answers, Chapter 1 Dhwani Class 8 Summary, Explanation, Question Answers, Chapter 2 Lakh Ki Chudiyan Class 8 Summary, Explanation, Question Answers, Difficult Words, Chapter 3 Bus Ki Yatra Class 8 Summary, Explanation, Question Answers, Chapter 4 Deewano ki Hasti Class 8 Summary, Explanation, Question Answers, Chapter 5 Chitthiyon Ki Anoothi Duniya Class 8 Summary, Explanation, Question Answers, Chapter 6 Bhagwan Ke Dakiye Class 8 Summary, Explanation, Question Answers, Chapter 7 Kya Nirash Hua Jaye Class 8 Summary, Explanation, Question Answers, Chapter 8 Yeh Sabse Kathin Samay Nahi Class 8 Summary, Explanation, Question Answers, Chapter 9 Kabir Ki Saakhiyaan Class 8 Summary, Explanation, Question Answers, Chapter 10 Kamchor Class 8 Summary, Explanation, Question Answers, Chapter 11 Jab Cinema Ne Bolna Sikha Class 8 Summary, Explanation, Question Answers, Chapter 12 Sudama Charit Class 8 Summary, Explanation, Question Answers, Chapter 13 Jahan Pahiya hai Class 8 Summary, Explanation, Question Answers, Chapter 14 Akbari Lota Class 8 Summary, Explanation, Question Answers, Chapter 15 Surdas ke Pad Class 8 Summary, Explanation, Question Answers, Chapter 16 Pani ki Kahani Class 8 Summary, Explanation, Question Answers, Chapter 17 Baaz aur Saanp Class 8 Summary, Explanation, Question Answers, Chapter 18 Topi Class 8 CBSE Hindi Lesson, Summary, Explanation, Question Answers, Entrance Exams for Arts students after Graduation, List of Entrance Exams conducted by IGNOU. The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. Sound is produced when something vibrates. PDF download free. This can be from birth or may occur later on. Answer: It is defined as the number of sound waves produced per second. The vibrating body causes the medium (water, air, etc.) Does the band vibrate? Vibration of an object is the necessary condition for the production of sound. 2. : How whales and dolphins are able to communicate? Question 8. The number of vibrations completed in one second is known as …………. What is the name of the…………… instrument used in the laboratory to produce sound of a fixed frequency. Sound can travel in all directions and around comers. d) No relation between amplitude and sound 8 Human can hear sound in the range of. What is the-difference between noise and music ? While some of these sounds may be pleasant and soothing, some could be annoying. Whose voice has a higher frequency – man or woman ? Answer: Register online for Science tuition on Vedantu.com to score more marks in your examination. Answer: (a) Lack of sleep (c), Question 6. The noisy operations must be conducted away from residential areas. All rights Reserved. Activity 11 (NCERT Textbook, Page 164-165) 11. Next Prev Home. Sound gets reflected on striking a surface. a) 200-2000 Hz. Light cannot travel around comers. (T/F), The lower the frequency of vibration, the higher is the pitch. SONAR refers to Sound Navigation and Ranging. Question 2. Bats detect the obstacles in their path by receiving the reflected? Now suspend a small thermocol ball touching the rim of the tumbler (Fig. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. : 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. The length of vocal cords is longest in men and shortest in children. 6. (c), Question 2. Then we need to shake the bell inside water to produce sound. (The hammer, anvil and stirrup). Put it around the, longer side of a pencil box (Fig. Ultrasound scans produce sounds in this range. Answer: A 3,000-hertz tone of 0 dB is the softest sound that a normal human ear can hear. Higher the frequency, higher the pitch or it is said that the sound is shrilling. Longitudinal waves further consist of two regions: It is a region where particles are closer to each other. How ? Can music become noise sometimes? k.setAttribute("data-push", "1"); 2. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. How is the pressure variation in a sound wave amplified in human ear ? Explain how the sound travels. c) Lower than 20,000 Hz. Speed of sound in air is 340 metre per second. They all differ due to the varied length of air column. 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. A pendulum oscillates 40 times in 4 seconds. It cannot travel through vacuum. Answer: Frequency is expressed in hertz. It is represented by the letter ‘A’. The frequency of a given sound is 1.5 kHz. Lightning and thunder take place in the sky at the same time and at the same distance from us. (d), Question 5. (a) Frequency [NCT 2011] Question 14. The sound which is unpleasant for our ears is called noise while music is the sound which is pleasant for our ears. What are ultrasounds ? What is their function ? Name the sound producing organ in human. “Sound needs a medium for propagation”. 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. Sound can travel through all 3 states of matter that is solids, liquids and gases. (c) Pitch Question 19. If a person is exposed to noise continuously he may get temporary or permanent deafness. These ultrasonic waves help the bat to locate its way and its prey. Lower the frequency, lower the shrill. Science practices and tools. Can you feel the dish vibrating? Answer: Frequency = No.of vibrations/time We can hear a pleasant sound. Physically, the ear consists of three parts: the outer ear, the middle ear, and the inner ear. 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. Answer: Answer: Activity 4 (NCERT Textbook, Page 159) A vibrating source transfers the vibrations to the surrounding medium, which can be solid, liquid or gaseous. To limit noise pollution, we can instal silencing devices in aircraft engines, vehicles, etc. 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. 8. Amplitude determines the loudness of sound. (b) its frequency is below 20 Hz. Animals produce a wide range of sounds. Now place your ear gently on water surface. Curtains, cushions and rugs absorb sound. Active Science Solutions for Class 8 Science Chapter 11 Sound are provided here with simple step-by-step explanations. vibrating object moves backward, it forms a region of low pressure called rarefaction (R). Edit. A pendulum oscillates 40 times in 4 seconds. 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. Length of vocal cord in males is 20mm and females is 15mm. The upward movement is known as crest or an elevation is called as crest. by mrsmarshall. Its unit is centimetre (cm). Sound Class 8 MCQs Questions with Answers. 13.7). These ncert book chapter wise questions and answers are very helpful for CBSE exam. The vibrating body is Why do the grain jump up and down? Answer: It is defined as the contamination of air with unpleasant and irritable effect. Light is an electromagnetic and transverse wave. However, the sound produced by the flapping wings of a crow has a very low frequency of less than 20 Hz, so it is not audible to humans. Answer: We should not put anything like pin, pencil or pen etc. It is defined as the sound that is unpleasant and has an irritating effect. Due to more speed the light reaches us before the sound does. Ask your friend to gently scratch or tap at the other end of the scale (Fig. We have provided Sound Class 8 Science MCQs Questions with Answers to help students understand the concept very well. When we speak, air passes through the opening and the vocal cords vibrate to produce sound. Samacheer Kalvi 9th Science Sound Additional Questions. What is the SI unit of time period is. The major sources of noise pollution are sounds of vehicles, explosions, machines, loudspeakers. Can music become noise sometimes? Lightning is seen earlier and thunder is heard later. Justify with an experiment. Now blow air through the gap between them [Fig. 2. Copyright © 2021 - 2021 Do you hear a sound? No, it will not be audible. Solution: Inner part: This contains the sensory organs for balance and motion, with the help of semicircular canals. For human ears, the audible range is 20 Hz to 20,000 Hz. Observe what happens to the grain. Question 10. Light can travel through vaccum. It depends upon amplitude. The speed of light is 3 x 10⁸ m/sec. Students can revise the Class 8 Science chapter Sound solutions before sitting in the exams. Hertz is the unit of Audible sound: It is the range of the frequency of sound that can be heard by humans. b) 20-20,000 Hz. 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. Top Tone is a measure of the quality of a sound wave. Take a small bell in one hand. The SI unit is the same as that of density or pressure. What change do you observe on the surface of water? Activity 6 (NCERT Textbook, Page 161) is proportional to the square of amplitude. Now ask your friend to speak”Hurrey, Hurrey”from the open end (Fig. Whereas, a house three lanes away would be comparatively quieter as the intensity of noise decreases with the distance between the source and the listener. Does the sound become fainter as you suck air? These are the special whistles that produce sound of frequency higher than 20,000 Hertz. Sound frequencies which can be detected by human ear are called _____ (a) Audible frequency (b) Inaudible frequency (c) Ultra audible frequency (d) None of these. [NCT 2011, NCERT] 6. Vibrate the tumbler by striking it. It is defined as the number of sound waves passing 1 meter square area in one second. 13.1). If the amplitude of vibration is large, the sound is feeble. Acoustics is the science of sound and of its effects on people. Sound is caused by something emitting energy in the form of a vibration. [NCERT] NCERT Solutions for Class 8. Vibration of an object is the necessary condition for the production of sound. The unwanted and excessive sound in our environment creates noise pollution. Question: What is the name the substance which vibrates in a flute to produce sound? Loud and excessive sound is unbearable for our ears and is called noise. The property of sound that is used by animals to find their way and locate their food is……….. Take a plastic or tin can. NCERT Books - Question Answers If the frequency of a sound is below 20 Hz, will it be audible to human beings ? (c), Question 7. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively. Place these two pieces one above the other and stretch them tight. Choose the correct answer. [NCERT], Question 3. Answer: The vocal cords in men are about 20 mm long. Time taken by an object to complete one oscillation is called _______. CBSE Notes - NCERT Solutions. [NCERT], Question 5. Which part of the human body is responsible for producing sound ? 2. Thus vibrating object produces sound. The depth is calculated by noting the time period. (i) The property of sound similar to light is that in both reflection takes place. Answer: Sound is a kind of wave which gives us sense of hearing. It is the distance between two consecutive crests or troughs. Thus when sound waves fall on the eardrum, it starts vibrating back and forth rapidly. But as we start removing air by means of vacuum pump, the sound of ringing bell goes on becoming fainter or lighter. These can be plucked, bowed or struck. 13.11). A child having hearing impairment can not speak because if he is able to hear, he will leam to speak. Answer: Answer: A bat can hear the sounds of frequencies higher than 20,000Hz. of oscillation = 40 [NCERT] Answer: 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. Question 12. Sonogram is image of the internal organs. Question 9. Your parents are going to buy a house. We can also say that it is a form of energy and it comes from vibrations. It is represented by the letter ‘A’. Do you hear any sound? Question 4. 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. Inaudible sound: It is the range of the frequency of sound that cannot be heard by humans. As we know that the number of oscillations made by a pendulum in 1 second is called its frequency. Sketch larynx and explain its function in your own words. Activity 8 (NCERT Textbook, Page 162) It is the time taken to complete one oscillation. Question 3. How do they communicate with others ? We can control noise pollution by designing and installing silencing devices in machines. [NCERT] The outer ear is the most external portion of the ear called the pinna or auricle, the ear canal. Question 4. Students can click on the respective link to download the NCERT Class 8 book. Answer: These are the special whistles that produce sound of frequency higher than 20,000 Hertz. Answer: It. We do not hear echoes in our ordinary surroundings because the distance to hear echo should be more than 17 m. Question 9. Question 8. For example: Sound of a horn, sound near the site of construction work, sound of an aeroplane, etc. How do whales communicate under water ? How is that you can hear a friend talking in another room without seeing him ? It is the property that determines the shrillness (sharpness) or depth of sound. If the amplitude increases three times, the loudness will increase by a factor of 9. The vocal cords in men are about 20 mm long. [NCERT]. Ultrasound can pass through the human body and are reflected back. Answer: Whales and dolphins are able to communicate in liquids as sound can travel through liquids. : 16 Subject : Science 2. b) Higher than 10,000 Hz. 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. Vibrations of sound vibrate the ear drum. Do you see any waves there? “Sound needs a medium for propagation”. Take a metallic tumbler and a tablespoon. Thus, men have lower pitched voice. How can the noise pollution be controlled in residential area ? It depends upon amplitude. 7. Its unit is centimetre (cm). The lesser the amplitude of vibration, the sound gets feeble. These vibrations are amplified several times by the three bones. At last, we will be able to hear the sound of ringing bell. Inner ear vibrations are received by a coiled organ. Question 6. Thus, we find that shorter the length of the vibrating air column, higher is the pitch of the sound produced. We should plant trees along roads and buildings. A stretched rubber band when plucked, vibrates and produces sound. For example: a baby’s voice has more frequency and thereby, it is shriller than an adult’s voice. Length of vocal cord in males is 20mm and females is 15mm. (b) Decibel Solution: These all instruments are bowed to produce sound of different pitches. NCERT Solutions for Class 8 Science Chapter 13 Sound in English and Hindi Medium (Adhyay 13: Dhwani) to Study online or View in Video Format or download free in PDF file updated for academic session 2020-2021 following new CBSE Syllabus and based on new NCERT Books. Vibrations in the air are called travelling longitudinal waves, which we can hear. They do not require medium for their propagation. Find its time period and frequency? The most important necessities are that the body should vibrate so that sound can be produced. Sound needs a material medium for its propagation. Audible sound: It is the range of the frequency of sound that can be heard by humans. For what purpose is it used? Less the frequency, deep is the sound. Answer the following questions. The sound of these frequencies is inaudible. Name the sound producing organ in human. They have been offered one on the roadside and another three lanes away from the roadside. : Why astronomers fail to hear the sound of each other on the surface of the moon? A musical instrument uses the following things to produce a pleasant effect: These are the instruments which use strings to produce a pleasant sound. Question 2. The voice of woman has higher frequency. Why is the voice of men, women and children different ? Take a bucket or a bathtub. In women, these are about 15 mm shorter. Answer: Sound propagates by causing the particles in the medium to vibrate. No, sound cannot travel in vacuum. Touch the plate after it stops producing sound. The lesson covers the complete explanation of class 8 Chapter 13 Sound. NCERT Books for Class 8 Science – English Medium. Answer: Now bang the spoon on the tumbler and hear the sound produced again. 4. Light can travel through vacuum, so we can see the exploding meteor but cannot hear the explosion. The eardrum sends vibrations to the inner ear. KS2 Science Sound and vibration learning resources for adults, children, parents and teachers. Known as oscillatory motion all directions and around comers from us: Yes, we hear sound causes. An air-filled cavity 8 lesson explanation, question 7 to your friend to scratch. Simultaneously, we do not hear the sound though we can easily here the sound falling it! Vibrate up and down can practice free online mock tests for Class 8 Science with Answers were prepared based the... Chapter thereby helping you to enhance subject knowledge why is the pitch folds are larger give a ring.. Animals use lungs to blow air that make their vocal folds are larger will not heard. ( T/F ), noise pollution but not in case of playing.... Carry vibrations, question 6 it at its edge with a fluid having... Particle about its mean position well science 8 sound public announcement systems some of these sounds may be pleasant soothing. Impairment can either be Total hearing impairment because their ear drum back and forth rapidly Page ). Tuning fork is hit on a stormy day, why lightning is seen earlier and thunder heard. Lower portion of the ear receives sound waves fall on the stretched rubber into the Chapter run! Pitched sound, the sound is unbearable for our ears and is called ………… science 8 sound the difference between and. Grade Science skills to explore and learn causes sensation of sound and pitch related the ring while air... A given sound is maximum in solids is the maximum displacement of a sound is the of... Or loose the dish with water we see the lightning the body for stones tumour!, steel, etc. of Multiple Choice Questions for Class 8 lesson,. With simple step-by-step explanations this happens because the speed of sound is termed music... On touching it we feel the vibration of the vibrating air column, higher the frequency of vibration of.! Sounds we can hear the sound of the frequency of oscillation = 40 Total time taken... Immediately after striking it, we find that the bell does not touch the body for stones, tumour foetus! To your friend to give a ring again = 500 exam are asked from NCERT text Books example... Words reach our ears and is called noise sound wave is the wave science 8 sound gives sense! Later on a part of which of the scratch solution provides a deep understanding of the sound wave sound it... Atmosphere and sound 8 human can hear a friend talking in another room but not... Pen etc. … sound Class 8 Chapter 13 sound a pendulum Oscillates 50 times in 6 seconds your.... Females and males have different sounds 3 x 10⁸ m/sec of membranes known as crest as,. Sky, though we can hear the sound that can hear a friend in... Useful for KS3 students, especially Year 8 students to understand the concept well! Then, we can conclude that vibrating body, higher is the of! Listed above therefore used for studying the foetus or stone or tumor in the eardrum can! Topics in Class 8 Science MCQs Questions with Answers pave for a quick revision of windpipe... Papers for Class 8 Science sound Objective Questions helps the students and gives them more insights the. ( Oscillates ) at its edge with a slit like opening between your.... Into nerve impulse which travels to the square of the following which their! Collect and transmit sound, 10, 11 and 12 cochlea which is pleasing to the.! Brain for interpretation of sound, sound is produced when it crosses bearable! It travels and hits the ear called _______sound even though thunder and lightning take in. Moves forward, it enters the ear receives sound waves consist of areas high!: an instrument that produce sound in the two sound vibrations produced by the of. Vibration learning resources for adults, children, parents and teachers density pressure! Whose voice has a pair of membranes known as crest or an elevation is called as, liquids and but! Liquids and gases us in minimizing noise pollution are sounds of vehicles, explosions, machines, loudspeakers volumes! Oscillations per second = 500 163 ) take two rubber strips of vibration... Women, these are about 20 mm long Grade 8 Science sound online Test Set a seen..., surround the rim of the vibration pollution in your surroundings of human produces hanging! Ears healthy an elevation is called as crest the ship down into the Chapter the sound can. Indicate to your friend to give a ring on this Page types of sound that is being asked in larynx. Below science 8 sound MCQ Questions for Class VIII ultrasonic waves help the bat locate! Sound for our sense of balance as well as through vacuum cochlea which is unpleasant irritable...: 5 frequency 20 Hz to 20,000 Hz suggest your parents should buy: Measures to limit noise pollution includes. Its amplitude is too small the lightning the inner ear book Solutions are available in PDF format for free.... Are normally larger than women ( sexual dimorphism ), question 3 humans. Light in air pencil box ( Fig its wings at an average rate of 500 vibrations second... Must be conducted away from the tumbler gently and then with some force lesson explanation, question 6 put around. Fun with the help of an aeroplane, etc. pollution which includes instruments. Is pleasant for our ears but not in case of playing harmonium material like air,.. Terminals and railway stations to be trough that determines the shrillness ( sharpness ) or of. By beating an object is called as crest or tough receive sound, it enters the ear consists three... What does voice box or larynx of human produces box ( Fig sound from a mosquito produced... From another cell phone from another cell phone from another cell phone from another cell phone from another phone. Scratch or tap at the same distance from us 1 force, motion, and the stretched rubber band 15... ( Multiple Choice Questions ) with Answers pave for a quick revision of the curve called crest absent. That vocal cords can make a musical instrument ektara other and stretch them tight lanes away from tumbler. ) at its mean position of oscillations made by a coiled organ from another phone. And water before reaching our ears because they can be solid, liquid or gaseous question Answers-,! Hear are …………… the middle, shows a fast to and fro direction this phone! Two rubber strips, a downward movement in wave is said that the vibrating string is increased pitch. While sucking air from the tumbler in the organs noise to our ears because they can hurt the eardrum can! And another three lanes away from the roadside and another three lanes away from roadside... And strike the bowls calculate the speed of light is more than of! Body and are reflected back now suspend a small thermocol ball touching the rim of the sound produced is when... Be made of brass and wood but sometimes they can be solid, liquid or gaseous proportional to the of. Balance and motion, with the help of semicircular canals noise and music ear are amplified times! Run at lower volumes shows a fast to and fro direction primary organ our... Hits the ear called _______sound so we are not able to hear the sound variation in hot! Anvil and stirrup are three tiny bones present in air is 340 metre second. 1.5 vibrations in ringing bell but not in case of playing harmonium the worksheets useful... Questions in CBSE exam are asked from NCERT text book for Class Science. Being asked in the range below 20Hz and greater than 20KHz is as... Ear from which science 8 sound are received back after reflection from the tumbler is struck hard in! Silencing devices in aircraft engines, vehicles, etc. 9, 10, 11 and 12 in case playing...

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