{"id":620593,"date":"2023-03-11T07:39:35","date_gmt":"2023-03-11T07:39:35","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=620593"},"modified":"2024-04-29T13:25:42","modified_gmt":"2024-04-29T13:25:42","slug":"ncert-exemplar-class-9-science-chapter-12-sound","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/","title":{"rendered":"NCERT Exemplar Class 9 Science\u00a0Chapter 12: Sound"},"content":{"rendered":"\n<p>NCERT Exemplar Class 9 Science&nbsp;Chapter 12: Sound. NCERT Exemplar Solutions for Class 9 Science&nbsp;Chapter 12 Sound prepare students for their Class 9 exams thoroughly. <\/p>\n\n\n\n<p>Science&nbsp;problems and solutions for the Class 9 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s board. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ncert-exemplar-class-9-science-nbsp-chapter-12-sound\"><strong>NCERT Exemplar Class 9 Science&nbsp;Chapter 12: Sound<\/strong><\/h2>\n\n\n\n<p>Class 9: Science&nbsp;Chapter 12 solutions. Complete Class 9 Science&nbsp;Chapter 12 Notes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Multiple Choice Questions<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Note is a sound\n<ul class=\"wp-block-list\">\n<li>(a) of mixture of several frequencies<\/li>\n\n\n\n<li>(b) of mixture of two frequencies only<\/li>\n\n\n\n<li>(c) of a single frequency<\/li>\n\n\n\n<li>(d) always unpleasant to listen<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>A key of a mechanical piano struck gently and then struck again but much&nbsp;harder this time. In the second case\n<ul class=\"wp-block-list\">\n<li>(a) sound will be louder but pitch will not be different<\/li>\n\n\n\n<li>(b) sound will be louder and pitch will also be higher<\/li>\n\n\n\n<li>(c) sound will be louder but pitch will be lower<\/li>\n\n\n\n<li>(d) both loudness and pitch will remain unaffected<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In SONAR, we use\n<ul class=\"wp-block-list\">\n<li>(a) ultrasonic waves<\/li>\n\n\n\n<li>(b) infrasonic waves<\/li>\n\n\n\n<li>(c) radio waves<\/li>\n\n\n\n<li>(d) audible sound waves<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Sound travels in air if\n<ul class=\"wp-block-list\">\n<li>(a) particles of medium travel from one place to another<\/li>\n\n\n\n<li>(b) there is no moisture in the atmosphere<\/li>\n\n\n\n<li>(c) disturbance moves<\/li>\n\n\n\n<li>(d) both particles as well as disturbance travel from one place to another.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>When we change feeble sound to loud sound we increase its\n<ul class=\"wp-block-list\">\n<li>(a) frequency<\/li>\n\n\n\n<li>(b) amplitude<\/li>\n\n\n\n<li>(c) velocity<\/li>\n\n\n\n<li>(d) wavelength<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In the curve (Fig.12.1) half the wavelength is<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/15765803507_cee5f6791d_o.jpg\" alt=\"\"><\/li>\n\n\n\n<li>Earthquake produces which kind of sound before the main shock wave begins\n<ul class=\"wp-block-list\">\n<li>(a) ultrasound<\/li>\n\n\n\n<li>(b) infrasound<\/li>\n\n\n\n<li>(c) audible sound<\/li>\n\n\n\n<li>(d) none of the above<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Infrasound can be heard by\n<ul class=\"wp-block-list\">\n<li>(a) dog<\/li>\n\n\n\n<li>(b) bat<\/li>\n\n\n\n<li>(c) rhinoceros<\/li>\n\n\n\n<li>(d) human beings<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting\n<ul class=\"wp-block-list\">\n<li>(a) intensity of sound only<\/li>\n\n\n\n<li>(b) amplitude of sound only<\/li>\n\n\n\n<li>(c) frequency of the sitar string with the frequency of other musical instruments<\/li>\n\n\n\n<li>(d) loudness of sound<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Short Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The given graph (Fig.12.2) shows the displacement versus time relation for a disturbance travelling with velocity of 1500 m s<sup>\u20131<\/sup>. Calculate the wavelength of the disturbance<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/15765516209_c896288f1c_o.jpg\" alt=\"\"><\/li>\n\n\n\n<li>Which of the above two graphs (a) and (b) (Fig.12.3) representing the human voice is likely to be the male voice? Give reason for your answer.<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/15764129298_00c31d23eb_o.jpg\" alt=\"\"><\/li>\n\n\n\n<li>A girl is sitting in the middle of a park of dimension 12 m \u00d7 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.<\/li>\n\n\n\n<li>Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?<\/li>\n\n\n\n<li>If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?<\/li>\n\n\n\n<li>Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340 m s<sup>\u2013<\/sup>1.)<\/li>\n\n\n\n<li>For hearing the loudest ticking sound heard by the ear, find the angle x in the Fig.12.4.<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/15949582141_af90737e90_o.jpg\" alt=\"\"><\/li>\n\n\n\n<li>Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?<\/li>\n<\/ol>\n\n\n\n<p><strong>Long Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Represent graphically by two separate diagrams in each case\n<ul class=\"wp-block-list\">\n<li>(i) Two sound waves having the same amplitude but different frequencies?<\/li>\n\n\n\n<li>(ii) Two sound waves having the same frequency but different amplitudes.<\/li>\n\n\n\n<li>(iii) Two sound waves having different amplitudes and also different wavelengths.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Establish the relationship between speed of sound, its wavelength and frequency. If velocity of sound in air is 340 m s<sup>\u20131<\/sup>, calculate\n<ul class=\"wp-block-list\">\n<li>(i) wavelength when frequency is 256 Hz.<\/li>\n\n\n\n<li>(ii) frequency when wavelength is 0.85 m.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also define wavelengths and time period using this curve.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Answers<\/h3>\n\n\n\n<p><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/04\/49037454382_1445e4c43c_o.png\"><br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/04\/49037454367_2d9e2261fc_o.png\"><br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/04\/49037454322_feaf58d38b_o.png\"><br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/04\/49036734663_ec535f0c0a_o.png\"><br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/04\/49036734638_c0131f3cbc_o.png\"><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>1. (c)<\/td><td>2. (a)<\/td><td>4. (c)<\/td><td>5. (b)<\/td><\/tr><tr><td>6. (b)<\/td><td>7. (b)<\/td><td>9. (c)<\/td><td>&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-problems-solutions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Exemplar Solutions<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-Science-solutions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Class 9 Exemplar Solutions<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Exemplar Class 9 Science&nbsp;Chapter 12: Sound. NCERT Exemplar Solutions for Class 9 Science&nbsp;Chapter 12 Sound prepare students for their Class 9 exams thoroughly. Science&nbsp;problems and solutions for the Class 9 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s board. NCERT Exemplar Class 9 Science&nbsp;Chapter 12: Sound [&hellip;]<\/p>\n","protected":false},"author":302,"featured_media":620595,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1411,921],"tags":[],"boards":[],"class_list":["post-620593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-book-solutions","category-class-9","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Exemplar for Class 9, Science\u00a0Chapter 12 - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Exemplar Class 9 Science\u00a0Chapter 12: Sound | Browse all Class 9 Science\u00a0Chapters NCERT Exemplar books - IndCareer Schools\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Exemplar Class 9 Science\u00a0Chapter 12: Sound\" \/>\n<meta property=\"og:description\" content=\"NCERT Exemplar Class 9 Science&nbsp;Chapter 12: Sound. NCERT Exemplar Solutions for Class 9 Science&nbsp;Chapter 12 Sound prepare students for their Class\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\" \/>\n<meta property=\"og:site_name\" content=\"IndCareer Schools\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/indcareer\" \/>\n<meta property=\"article:published_time\" content=\"2023-03-11T07:39:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T13:25:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/indcareer-schools-2-16-5-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"901\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Pooja\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@indcareer\" \/>\n<meta name=\"twitter:site\" content=\"@indcareer\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Pooja\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\"},\"author\":{\"name\":\"Pooja\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/#\/schema\/person\/d6945cf059726f162259ba738092301e\"},\"headline\":\"NCERT Exemplar Class 9 Science\u00a0Chapter 12: Sound\",\"datePublished\":\"2023-03-11T07:39:35+00:00\",\"dateModified\":\"2024-04-29T13:25:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\"},\"wordCount\":697,\"publisher\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/03\/indcareer-schools-2-16-5-scaled.jpg\",\"articleSection\":[\"Book Solutions\",\"class 9\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\",\"url\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-9-science-chapter-12-sound\/\",\"name\":\"NCERT Exemplar for Class 9, Science\u00a0Chapter 12 - 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