{"id":84534,"date":"2025-06-01T02:35:06","date_gmt":"2025-06-01T02:35:06","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=84534"},"modified":"2025-06-01T02:35:06","modified_gmt":"2025-06-01T02:35:06","slug":"which-one-of-the-following-statements-is-not-correct-5","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/","title":{"rendered":"Which one of the following statements is not correct?"},"content":{"rendered":"<p>Which one of the following statements is not correct?<\/p>\n<p>[amp_mcq option1=&#8221;Sound waves in gases are longitudinal in nature&#8221; option2=&#8221;Sound waves having frequency below 20 Hz are known as ultrasonic waves&#8221; option3=&#8221;Sound waves having higher amplitudes are louder&#8221; option4=&#8221;Sound waves with high audible frequencies are sharp&#8221; correct=&#8221;option2&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC CDS-1 &#8211; 2016<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-cds-1-2016.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-cds-1-2016\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nLet&#8217;s evaluate each statement:<br \/>\nA) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation.<br \/>\nB) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz).<br \/>\nC) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound.<br \/>\nD) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill.<br \/>\nThe statement that is NOT correct is B.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\nSound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nThe audible range for humans is typically considered to be from 20 Hz to 20 kHz, although this range can vary individually and decreases with age.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Which one of the following statements is not correct? [amp_mcq option1=&#8221;Sound waves in gases are longitudinal in nature&#8221; option2=&#8221;Sound waves having frequency below 20 Hz are known as ultrasonic waves&#8221; option3=&#8221;Sound waves having higher amplitudes are louder&#8221; option4=&#8221;Sound waves with high audible frequencies are sharp&#8221; correct=&#8221;option2&#8243;] This question was previously asked in UPSC CDS-1 &#8211; &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Which one of the following statements is not correct?\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/#more-84534\">Detailed Solution<span class=\"screen-reader-text\">Which one of the following statements is not correct?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1087],"tags":[1098,1128,1147],"class_list":["post-84534","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1098","tag-physics","tag-sound","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which one of the following statements is not correct?<\/title>\n<meta name=\"description\" content=\"Let&#039;s evaluate each statement: A) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation. B) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz). C) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound. D) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill. The statement that is NOT correct is B. Sound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following statements is not correct?\" \/>\n<meta property=\"og:description\" content=\"Let&#039;s evaluate each statement: A) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation. B) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz). C) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound. D) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill. The statement that is NOT correct is B. Sound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T02:35:06+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following statements is not correct?","description":"Let's evaluate each statement: A) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation. B) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz). C) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound. D) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill. The statement that is NOT correct is B. Sound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements is not correct?","og_description":"Let's evaluate each statement: A) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation. B) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz). C) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound. D) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill. The statement that is NOT correct is B. Sound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T02:35:06+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/","name":"Which one of the following statements is not correct?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T02:35:06+00:00","dateModified":"2025-06-01T02:35:06+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Let's evaluate each statement: A) Sound waves in gases are longitudinal in nature: Correct. Sound waves in fluids (gases and liquids) are longitudinal, meaning the particles of the medium vibrate parallel to the direction of wave propagation. B) Sound waves having frequency below 20 Hz are known as ultrasonic waves: Incorrect. Frequencies below the normal human hearing range (approximately 20 Hz) are called infrasonic waves. Ultrasonic waves are sound waves with frequencies above the normal human hearing range (approximately 20 kHz). C) Sound waves having higher amplitudes are louder: Correct. The amplitude of a sound wave is related to its intensity, and intensity is perceived as loudness. A higher amplitude corresponds to higher intensity and thus a louder sound. D) Sound waves with high audible frequencies are sharp: Correct. Frequency corresponds to pitch. Higher frequency means higher pitch, and sounds with high pitch are often described as sharp or shrill. The statement that is NOT correct is B. Sound frequencies below the audible range (20 Hz) are infrasonic, and frequencies above the audible range (20 kHz) are ultrasonic.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-5\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"Which one of the following statements is not correct?"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/84534","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=84534"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/84534\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=84534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=84534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=84534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}