When the source of sound vibrates it collides with the particles present in air. 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. What […] 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 … Sound is a form of energy that produces sensation of hearing. Top. In women, these are about 15 mm shorter. If a person is exposed to noise continuously he may get temporary or permanent deafness. It is collected by ear pinna and it directs into ear canal where it travels and hits the ear drum. Lightning and thunder take place in the sky at the same time and at the same distance from us. (T/F), For human ears, the audible range is 20 Hz to 20,000 Hz. 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. It is represented by the letter ‘A’. Explain your answer. Rarefactions are the regions of low pressure and density where the particles are spread out and. Answer: Larynx Question 4. Your email address will not be published. NCERT Solutions for Class 8 Science Sound Class 8 Science book solutions are available in PDF format for free download. Register online for Science tuition on Vedantu.com to score more marks in your examination. Answer: Solid Question 3. Hello! Identify laboratory tools 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). Answer: While hearing is the obvious function of the ear, it is the primary organ for our sense of balance as well. It depends upon the square of amplitude. Ultrasound scans produce sounds in this range. Bat produces ultrasonic sound during screaming and that is the frequency of a sound is more than 20,000Hz,  it cannot be heard by us. Can music become noise sometimes? vibrating object moves backward, it forms a region of low pressure called rarefaction (R). (c) Hypertension A music player sound like guitar, violin, etc. Thus vibrating object produces sound. Condensation is a region in a sound wave in which the sound medium is denser than normal. (T/F), Unwanted or unpleasant sound is termed as music. We observed that sound becomes fainter than earlier when we try to suck air. A pendulum makes 27 oscillations in 3 seconds. Sound: (i) Sound is a form of energy like heat energy, light energy, potential energy and kinetic energy. If the eardrum is absent we would not be able to hear. (a) its amplitude is too small. Define vibration. It is  used for investigation purpose. (c), Question 7. The upward movement is known as crest or an elevation is called as crest. 6. 9. Play this instrument and identify its vibrating part. (a) Lack of sleep This also contains cochlea, the sensory organ for hearing. Why ? (a) Baby girl For what purpose is it used? Ears have a stretched structure called ear drum. Answer: CBSE Class 8 Science Sound Objective Questions helps the students to understand the concepts thoroughly and to score good marks. What is the use of ultrasound in medicine and industry ? These all instruments are bowed to produce sound of different pitches. Sound can be produced by beating an object irrespective of whether these are vibrating or not. of the vibrating body which produces sound. Sound travels faster in a hot medium, or in a solid. A bat can hear the sounds of frequencies higher than 20,000Hz. The frequency of a given sound is 1.5 kHz. 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. Vibrate the tumbler by striking it. NCERT Solutions for Class 8. 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. Question 8. Calculate the speed of sound. The book is available in all English, Hindi & Urdu Medium. It is the time taken to complete one oscillation. Answer: NCERT Books - Question Answers When the vocal cords are tight and thin, the type or quality of voice is different from that when they are loose and thick. Many animals use lungs to blow air that make their vocal cords vibrate and sound is produced. Sound can propagate Due to noise pollution a person may suffer from lack of sleep, hypertension and anxiety. Top. Answer: The two kinds of sounds we cannot hear are ……………. Sound vibrations make the eardrum vibrate. This obviously causes pollution. If the amplitude increases three times, the loudness will increase by a factor of 9. Yes, we hear the sound on plucking the rubber band. If the thickness of the vibrating string is increased its pitch ………………, The range of audible frequency for the human ear is……………. Sounds of crackers, factories, vehicles, desert coolers, air conditioners, aeroplane, transistors or television with high volume, loudspeakers, etc. Touch the plate or pan gently with your finger. And …………. Number of vibrations per second = 500. Bats detect the obstacles in their path by receiving the reflected? Yes, music can become noise when it’s too loud. Explosions including bursting of crackers. The principle of reflection of sound is used in SONAR. Music is a sound which produces a pleasing sensation. Answer: The type of sound which are unpleasant to listen is known as noise whereas music is a pleasant sound, which produces a sensation. The sound cannot travel through a vacuum. Register online for Science tuition on Vedantu.com to score more marks in your examination. Answer: The sound vibrations produced by the wings of a flying bee are in this range, so this sound is audible to human. How is the pressure variation in a sound wave amplified in human ear ? Sound is the form of energy that causes sensation of hearing. (ii) Sound helps us communicate with each other. Answer: 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. 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. Put your mouth on the opening between your hands. Compare the amplitudes of vibrations of the tumbler in the two cases. })(window, document); Your email address will not be published. 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. Here we have covered Important Questions on Sound for Class 8 Science subject. Major causes of noise pollution are as follows: Measures to limit Noise pollution are as follows: 1. Played 323 times. d) 2000-200000 Hz 9 An ultrasound equipment works at frequency. Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 8 so that you can refer them as and when required. Extreme or loud sounds cause impairment of hearing. Question 8. What is the time period of the vibration ? Now bang the spoon on the tumbler and hear the sound produced again. 6. Activity 2 (NCERT Textbook, Page 758) Answer the following questions. Solution: Answer: Question 14. Sound absorbing materials are required in auditoria to avoid ……………. Is the sound louder when the tumbler is struck hard? Total time is taken = 4 seconds, Question 6. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. Sound is produced when something vibrates. This impairment can either be total hearing impairment or partial impairment. Loud and excessive sound is unbearable for our ears and is called noise. Edit. These are called. They have been offered one on the roadside and another three lanes away from the roadside. They all differ due to the varied length of air column. Soundshaving frequency more than 20 Hz are called Find its time period and frequency? Sound Class 8 MCQs Questions with Answers. What is the function of eusfachian tube in human ear ? Question 9. No, it will not be audible. The pitch of sound depends on the which of the following of the vibrating body? Top. The second most important source is medium through which receiver can heard. Fill in the blanks with suitable words. Community law enforcers should check the misuse of loudspeakers, processions, outdoor parties and discos, as well as public announcement systems. - Phys Sci. K to 12 - Grade 8 Science Learner Module 1. It is represented by the letter ‘A’. In which medium sound propagates the maximum? The sound of these frequencies is inaudible. The base loudness level is defined as that loudness of sound that the human ear can just perceive. Do you hear any sound? Science - Class 8 / Grade 8 (Chapter 11 - 18) Chapter 13 – Sound – 2 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. c) 2-20000 Hz. Some people suffer from hearing impairment because their ear drum is damaged or absent. d) No relation between amplitude and sound 8 Human can hear sound in the range of. Fill it with clean water. We can also say that the amplitude of a sound wave is the height of the crest or tough. MCQ Questions for Class 8 Science: Ch 13 Sound 02 Sept, 2020 MCQ Questions for Class 8 Science: Ch 13 Sound. Answer: We should not put anything like pin, pencil or pen etc. Question 2. Understand the sound is a form of energy. (b) taking 1,500 seconds to complete one vibration. In dish washing machines where water and detergent are vibrate with ultrasonic vibrators. Why do the grain jump up and down? Let us suppose, in a fare, if someone is lost, loud speakers are used to find him because in fare, there are a lot of people and a lot of noise. (a) Frequency Can you explain why? Answer: What sources in the home may lead to noise ? Question 7. NCERT Solutions Class 8 Science Chapter 13 Sound. The sound which is pleasing for the ear are called _____ (a) Lonely sound (b) Solo sound (c) Echo (d) Musical sound. Use of ultrasound in medicine : Question 5. Birds chirp with the help syrinx in their wind pipe. Answer: Sound Question 2. At Study Path, you can download PDF of Multiple Choice Questions for Class 8 Chapter 13 Sound with Answers. Topics covered are sound, types of sound, sound as wave and wave types. Sketch larynx and explain its function in your own words. The third most important source is receiver. PDF download free. It needs medium to travel. What is the basic principle of its working ? 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. Structure of ear. More is the amplitude, louder is the sound. (b) Supersonic 2. Thus, we find that shorter the length of the vibrating air column, higher is the pitch of the sound produced. It is the speed with which sound travels. Can music become noise sometimes,? Not sure where to start? Question 16. The outer ear is the most external portion of the ear called the pinna or auricle, the ear canal. These vibrations create sound waves which move through medium such as air and water before reaching our ears. Music becomes noise sometimes, when it crosses the bearable range of sound for our ears. Question: Why should we never put a sharp, pointed or hard, thing into our ear? Calculate the speed of sound. Make sure that it is dry. How do plants help in reducing noise pollution ? The eardrum is like a stretched rubber sheet. If the frequency of vibration is higher then the sound has a higher pitch. Answer: The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. : How whales and dolphins are able to communicate? What is the name of the…………… instrument used in the laboratory to produce sound of a fixed frequency. Outer part: It consist of ear pinna, auditory canal, and ear drum. Therefore, we can hear a friend talking in another room but cannot see him. 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. around it to vibrate. What is the name the substance which vibrates in a flute to produce sound? Vibration of an object is the necessary condition for the production of sound. It causes a sensation of hearing in our ears. Violin: Violin produces the sound of highest pitch. The vibrating body causes the medium (water, air, etc.) Answer: There are different sources of noise pollution which includes honking of horns, loudspeakers, loud sound of machines in factories, loud sound of TV, radio, domestic etc. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively. What happens to sound when it strikes a surface ? Why do we not hear echoes in our ordinary surroundings ? 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. Question: Lightning and thunder take place in the sky at the same time and at the same distance from us. During the propagation of sound, the particles of the medium receive these vibrations and transfer them to the surrounding particles, allowing sound to travel. Answer: It is the wave which can travel through a medium as well as through vacuum. (d) None of these They are received back after reflection from the sea bed. The speed of light is more than that of the speed of sound. What is the SI unit of time period is. Loud and excessive sound is unbearable for our ears and is called noise. In humans, the sound is produced by the voice box or larynx. The vibrating body is 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. How is that you can hear a friend talking in another room without seeing him ? This is due to different levels of water in the bowls. Speed of sound in air is 340 metre per second. These can be plucked, bowed or struck. Which house would you suggest your parents should buy? (c) taking 1.5 seconds to complete one vibration. 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