{"id":88837,"date":"2025-06-01T07:23:12","date_gmt":"2025-06-01T07:23:12","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88837"},"modified":"2025-06-01T07:23:12","modified_gmt":"2025-06-01T07:23:12","slug":"which-one-of-the-following-statements-about-earthquake-waves-is-not","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-earthquake-waves-is-not\/","title":{"rendered":"Which one of the following statements about earthquake waves is not"},"content":{"rendered":"

Which one of the following statements about earthquake waves is not correct?<\/p>\n

[amp_mcq option1=”P waves move faster and are the first to arrive at the surface.” option2=”P waves can travel through gaseous, liquid and solid materials.” option3=”Seismographs located beyond 145\u00b0 from epicentre can record the arrival of P waves.” option4=”P waves have maximum area covered under its shadow zone.” correct=”option4″]<\/p>\n

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\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nLet’s examine each statement about earthquake waves:
\nA) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth’s surface or within it. This statement is correct.
\nB) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct.
\nC) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth’s core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct.
\nD) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect.
\n<\/section>\n
\nThe key difference in shadow zones is that P waves are refracted by the core (creating a partial shadow zone), while S waves are stopped by the liquid outer core (creating a larger, complete shadow zone beyond 105\u00b0).
\n<\/section>\n
\nEarthquake waves provide valuable information about the Earth’s interior structure. The existence and size of the shadow zones for P and S waves were crucial in determining the presence of a liquid outer core.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements about earthquake waves is not correct? [amp_mcq option1=”P waves move faster and are the first to arrive at the surface.” option2=”P waves can travel through gaseous, liquid and solid materials.” option3=”Seismographs located beyond 145\u00b0 from epicentre can record the arrival of P waves.” option4=”P waves have maximum area covered … <\/p>\n

Detailed SolutionWhich one of the following statements about earthquake waves is not<\/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":[1108,1217,1106],"class_list":["post-88837","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1108","tag-the-earthquake","tag-world-and-physical-geography","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements about earthquake waves is not<\/title>\n<meta name=\"description\" content=\"Let's examine each statement about earthquake waves: A) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth's surface or within it. This statement is correct. B) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct. C) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth's core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct. D) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect. The key difference in shadow zones is that P waves are refracted by the core (creating a partial shadow zone), while S waves are stopped by the liquid outer core (creating a larger, complete shadow zone beyond 105\u00b0).\" \/>\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-earthquake-waves-is-not\/\" \/>\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 earthquake waves is not\" \/>\n<meta property=\"og:description\" content=\"Let's examine each statement about earthquake waves: A) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth's surface or within it. This statement is correct. B) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct. C) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth's core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct. D) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect. The key difference in shadow zones is that P waves are refracted by the core (creating a partial shadow zone), while S waves are stopped by the liquid outer core (creating a larger, complete shadow zone beyond 105\u00b0).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-earthquake-waves-is-not\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:23:12+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 earthquake waves is not","description":"Let's examine each statement about earthquake waves: A) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth's surface or within it. This statement is correct. B) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct. C) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth's core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct. D) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect. The key difference in shadow zones is that P waves are refracted by the core (creating a partial shadow zone), while S waves are stopped by the liquid outer core (creating a larger, complete shadow zone beyond 105\u00b0).","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-earthquake-waves-is-not\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements about earthquake waves is not","og_description":"Let's examine each statement about earthquake waves: A) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth's surface or within it. This statement is correct. B) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct. C) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth's core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct. D) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect. The key difference in shadow zones is that P waves are refracted by the core (creating a partial shadow zone), while S waves are stopped by the liquid outer core (creating a larger, complete shadow zone beyond 105\u00b0).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-earthquake-waves-is-not\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:23:12+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-earthquake-waves-is-not\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-earthquake-waves-is-not\/","name":"Which one of the following statements about earthquake waves is not","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:23:12+00:00","dateModified":"2025-06-01T07:23:12+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Let's examine each statement about earthquake waves: A) P waves (Primary waves) are the fastest seismic waves and are the first to reach any point on the Earth's surface or within it. This statement is correct. B) P waves are compressional waves and can travel through solid, liquid, and gaseous mediums. This statement is correct. C) Seismographs located beyond 145\u00b0 from the epicenter *can* record P waves, but these are the P waves that have been refracted by the Earth's core. There is a P-wave shadow zone between approximately 105\u00b0 and 145\u00b0 where direct P waves are not recorded due to refraction. Beyond 145\u00b0, refracted P waves arrive. This statement is correct. D) The shadow zone for P waves is the area between ~105\u00b0 and ~145\u00b0. S waves (Secondary waves) cannot travel through the liquid outer core, resulting in an S-wave shadow zone that starts at ~105\u00b0 and extends to the entire hemisphere beyond that. Therefore, the S-wave shadow zone is much larger than the P-wave shadow zone. This statement is incorrect. 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