{"id":88710,"date":"2025-06-01T07:18:49","date_gmt":"2025-06-01T07:18:49","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88710"},"modified":"2025-06-01T07:18:49","modified_gmt":"2025-06-01T07:18:49","slug":"which-one-of-the-following-statements-about-sound-is-not-correct","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-sound-is-not-correct\/","title":{"rendered":"Which one of the following statements about sound is NOT correct ?"},"content":{"rendered":"

Which one of the following statements about sound is NOT correct ?<\/p>\n

[amp_mcq option1=”Sound travels at a speed slower than the speed of light” option2=”Sound waves are transverse waves” option3=”Sound waves are longitudinal waves” option4=”Sound travels faster in moist air than in dry air” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2020<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nLet’s evaluate each statement:
\nA) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature.
\nB) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components.
\nC) Sound waves are longitudinal waves: This is correct for sound in air or liquids.
\nD) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air.
\nThe statement that is NOT correct is B.
\n<\/section>\n
\nSound waves in fluids (like air) are longitudinal waves. Transverse waves have particle displacement perpendicular to the direction of propagation (e.g., light waves, waves on a string).
\n<\/section>\n
\nThe speed of sound depends on the properties of the medium (elasticity and density). It is faster in solids than in liquids, and faster in liquids than in gases, primarily due to differences in elasticity (compressibility). Temperature also affects the speed of sound in gases.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements about sound is NOT correct ? [amp_mcq option1=”Sound travels at a speed slower than the speed of light” option2=”Sound waves are transverse waves” option3=”Sound waves are longitudinal waves” option4=”Sound travels faster in moist air than in dry air” correct=”option2″] This question was previously asked in UPSC NDA-2 – 2020 … <\/p>\n

Detailed SolutionWhich one of the following statements about sound 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":[1094],"tags":[1288,1128,1147],"class_list":["post-88710","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1288","tag-physics","tag-sound","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements about sound is NOT correct ?<\/title>\n<meta name=\"description\" content=\"Let's evaluate each statement: A) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature. B) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components. C) Sound waves are longitudinal waves: This is correct for sound in air or liquids. D) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air. The statement that is NOT correct is B. Sound waves in fluids (like air) are longitudinal waves. Transverse waves have particle displacement perpendicular to the direction of propagation (e.g., light waves, waves on a string).\" \/>\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-about-sound-is-not-correct\/\" \/>\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 about sound is NOT correct ?\" \/>\n<meta property=\"og:description\" content=\"Let's evaluate each statement: A) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature. B) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components. C) Sound waves are longitudinal waves: This is correct for sound in air or liquids. D) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air. The statement that is NOT correct is B. Sound waves in fluids (like air) are longitudinal waves. Transverse waves have particle displacement perpendicular to the direction of propagation (e.g., light waves, waves on a string).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-sound-is-not-correct\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:18:49+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=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following statements about sound is NOT correct ?","description":"Let's evaluate each statement: A) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature. B) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components. C) Sound waves are longitudinal waves: This is correct for sound in air or liquids. D) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air. The statement that is NOT correct is B. Sound waves in fluids (like air) are longitudinal waves. Transverse waves have particle displacement perpendicular to the direction of propagation (e.g., light waves, waves on a string).","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-about-sound-is-not-correct\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements about sound is NOT correct ?","og_description":"Let's evaluate each statement: A) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature. B) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components. C) Sound waves are longitudinal waves: This is correct for sound in air or liquids. D) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air. The statement that is NOT correct is B. Sound waves in fluids (like air) are longitudinal waves. Transverse waves have particle displacement perpendicular to the direction of propagation (e.g., light waves, waves on a string).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-sound-is-not-correct\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:18:49+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-sound-is-not-correct\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-sound-is-not-correct\/","name":"Which one of the following statements about sound is NOT correct ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:18:49+00:00","dateModified":"2025-06-01T07:18:49+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Let's evaluate each statement: A) Sound travels at a speed slower than the speed of light: This is correct. The speed of light in vacuum is approximately 3 x 10\u2078 m\/s, while the speed of sound in air is approximately 343 m\/s at room temperature. B) Sound waves are transverse waves: This is NOT correct. Sound waves in a gas or liquid are longitudinal waves, meaning the particle displacement is parallel to the direction of wave propagation (compressions and rarefactions). Sound waves in solids can have both longitudinal and transverse components. C) Sound waves are longitudinal waves: This is correct for sound in air or liquids. D) Sound travels faster in moist air than in dry air: This is generally correct. At the same temperature and pressure, moist air is slightly less dense than dry air because water molecules (molecular mass ~18) replace nitrogen (N\u2082, ~28) and oxygen (O\u2082, ~32) molecules. While density decreases, the bulk modulus also changes. The effect of lower density dominates, leading to a slightly higher speed of sound in moist air. The statement that is NOT correct is B. Sound waves in fluids (like air) are longitudinal waves. 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