{"id":13138,"date":"2020-10-13T14:05:09","date_gmt":"2020-10-13T08:35:09","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=13138"},"modified":"2022-03-02T11:16:22","modified_gmt":"2022-03-02T05:46:22","slug":"sound-class-8-extra-questions","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/sound-class-8-extra-questions\/","title":{"rendered":"Sound Class 8 Extra Questions and Answers Science Chapter 13"},"content":{"rendered":"

Sound Class 8 Extra Questions and Answers Science Chapter 13 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science<\/a> Question bank on a regular basis.<\/p>\n

Class 8 Science Chapter 13 Extra Questions and Answers Sound<\/h2>\n

Extra Questions for Class 8 Science Chapter 13 Sound with Answers<\/strong><\/p>\n

Sound Class 8 Extra Questions Very Short Answer Type<\/h3>\n

Question 1.
\nName some of the musical instruments which are simply beaten or struck to produce music.
\nAnswer:
\nSuch instruments are manjira, ghatam, kartal, dholak, etc.<\/p>\n

\"Sound<\/p>\n

Question 2.
\nWhat part in humans produces sound?
\nAnswer:
\nIt is voice box in humans, that produces sound.<\/p>\n

Question 3.
\nCan sound travel through solid also?
\nAnswer:
\nYes, the sound can travel through solids also.<\/p>\n

Question 4.
\nWhat is to and fro motion of an object called?
\nAnswer:
\nThe to and fro motion of an object is called vibration or oscillatory motion.<\/p>\n

Sound Class 8 Extra Questions Short Answer Type 1<\/h3>\n

Question 1.
\nWhat role does sound play in our life?
\nAnswer:
\nThe sound plays an important role in our life. It helps us to communicate with one another.<\/p>\n

Question 2.
\nDefine vibration. What is its other 7 name ?
\nAnswer:
\nThe to and fro or back and forth motion of an object is known as vibration. Its other name is oscillation or oscillatory motion.<\/p>\n

\"Sound<\/p>\n

Question 3.
\nHow do dolphins and whales communicate?
\nAnswer:
\nThe sound can travel in water as it is also a medium for sound to travel. So, whales and dolphins, which live in water, can easily communicate there.<\/p>\n

Question 4.
\nWhy does sound travel through wood or metals?
\nAnswer:
\nAs wood and all metals are solid matters, and all solids are the media for sound to travel, so sound travels through wood or metals.<\/p>\n

Question 5.
\nWhy should we never put a sharp, pointed or hard things into our ears?
\nAnswer:
\nIf we put sharp, pointed or hard (things in our ear, the eardrum might get damaged. And damage to eardrum can cause deafness).<\/p>\n

Question 6.
\nDefine frequency of oscillation.
\nAnswer:
\nThe number of oscillations or vibrations produced per second is known as frequency of oscillation.<\/p>\n

Question 7.
\nHow is frequency of oscillation expressed?
\nAnswer:
\nThe frequency of oscillation is expressed in terms of hertz. Its symbol is Hz. A frequency of one Hz is one oscillation per second.<\/p>\n

Question 8.
\nIf an object oscillates 20 times in one second, what would be its frequency?
\nAnswer:
\nAs the frequency is the number of vibrations per second; so in this case, when, an object oscillates 20 times in one second, its frequency would be 20 Hz.<\/p>\n

Question 9.
\nCan we differentiate sounds on the basis of their amplitudes and frequencies?
\nAnswer:
\nYes, with the help of amplitude and frequency we can differentiate two sounds easily.<\/p>\n

\"Sound<\/p>\n

Question 10.
\nDefine amplitude. How is it expressed ?
\nAnswer:
\nThe displacement of the oscillating body is the measure of the amplitude of vibration of the body. It is expressed in terms of metre (m).<\/p>\n

Question 11.
\nHow is loudness of a sound determined ?
\nAnswer:
\nThe loudness of a sound is determined by its amplitude. When the amplitude of a vibration is large, the sound produced is loud, and in case of the smaller amplitude, the sound produced is feeble.<\/p>\n

Question 12.
\nWhat is noise? Do you enjoy the sound produced by horns of buses and trucks? Why?
\nAnswer:
\nThe unpleasant sounds are called noise. We do not enjoy the sounds produced by the horns of buses and trucks because these sounds are loud and harsh and hende are unpleasant sounds.<\/p>\n

Question 13.
\nWhat are the causes of hearing impairment ?
\nAnswer:
\nHearing impairment is generally the result of an ear disease, injury or degeneration of the hearing mechanism with age. The noise pollution also contribute to deafness.<\/p>\n

Question 14.
\nHow can one improve hearing impairment ? Is society and technology to contribute towards improving this defect ?
\nAnswer:
\nTechnological devices for the hearing impaired have made it possible for such persons to improve their quality of hearing. Society too, can do much to improve the living environment for the hearing impaired by minimising noise pollution.<\/p>\n

\"Sound<\/p>\n

Question 15.
\nWhat should be done to control noise pollution?
\nAnswer:
\nTo control noise pollution, we must control the sources of noise at home or in the surroundings. We should also plant trees in the surroundings.<\/p>\n

Sound Class 8 Extra Questions Short Answer Type 2<\/h3>\n

Question 1.
\nWhat is noise pollution and what are the harms due to it? Mention any two methods to limit noise pollution.
\nAnswer:
\nNoise pollution: Presence of excessive or unwanted sounds in the environment is called noise pollution.
\nMajor causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers, etc.<\/p>\n

Harms of noise pollution:
\n(a) The presence of excessive noise in the surroundings causes many health related problems like lack of sleep, hypertension, anxiety, etc.
\n(b) A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing.<\/p>\n

Methods to control noise pollution :
\n(a) Use of automobile horns should be minimised.
\n(b) TV and music systems should be run at low volumes.<\/p>\n

Question 2.
\nWhat are audible and inaudible sounds ? Describe.
\nAnswer:
\nAudible sounds: Sounds of frequencies between 20 to 20,000 hertz.
\nInaudible sounds:
\n(i) Sounds of frequencies less than 20 hertz. Such sounds are called infrasonic.
\n(ii) Sounds of frequencies more than 20,000 hertz. Such sounds are called ultrasonic.<\/p>\n

Question 3.
\nWhat are the uses of ultrasound?
\nAnswer:
\nUses of ultrasound :<\/p>\n

    \n
  1. The ultrasound or ultrasonic sound is used in investigating and tracking many medical problems.<\/li>\n
  2. In industries, ultrasound is used for detecting flaws and cracks in metallic and other structures.<\/li>\n
  3. Some operations, like bloodless surgery, can be done by applying this sound.<\/li>\n<\/ol>\n

    \"Sound<\/p>\n

    Question 4.
    \nWrite a short note on the children having impaired hearing.
    \nAnswer:
    \nA child who has a moderately severe hearing loss and does not use a hearing aid will hear very little conversational speech, because speech develops as the direct result of hearing. A child with a moderately severe hearing loss may have defective speech, minimal expressive vocabulary and inadequate language structure. So, children with impaired hearing need special care. By learning sign language such children can communicate effectively.<\/p>\n

    Sound Class 8 Extra Questions Long Answer Type<\/h3>\n

    Question 1.
    \nDescribe the construction and working of ears with diagram.
    \nAnswer:
    \nWe hear sound through our ears. The shape of the outer part of ear is like a funnel. When sound enters in it, it travels down a canal at the end of which a thin membrane is stretched tightly. It is called the eardrum.
    \n\"Sound
    \nSound vibrations make the eardrums vibrate. The eardrum sends vibrations to the inner ear. From there, the signals go to the brain and we hear.<\/p>\n

    Question 2.
    \n(a) Name the sound box in human being. Explain, how it works ?
    \n(b) A body vibrates 100 times in 20 seconds. Calculate the time period and frequency.
    \nAnswer:
    \n(a) The name of the voice box is larynx. The larynx or voice box is responsible for producing sounds in humans were. The voice box consists of two vocal chords. These chords are arranged in such a manner that there is a small gap between them. This small gap allows air to pass through. When we speak, air is forced into this small gap by the lungs. The vibrations in the vocal chords produces the sound.
    \n(b) Number of vibrations = 100
    \nTime taken = 20 s
    \nTime taken to complete one vibration
    \n\"Sound<\/p>\n

    Hope the knowledge provided regarding the Sound Class 8 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Sound Class 8 Extra Questions and Answers Science Chapter 13 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science Question bank on a regular basis. Class 8 Science Chapter 13 Extra Questions and …<\/p>\n

    Sound Class 8 Extra Questions and Answers Science Chapter 13<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[7],"tags":[],"yoast_head":"\nSound Class 8 Extra Questions and Answers Science Chapter 13 - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/sound-class-8-extra-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sound Class 8 Extra Questions and Answers Science Chapter 13 - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"Sound Class 8 Extra Questions and Answers Science Chapter 13 PDF are solved by experts and will guide students in the right direction. 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