{"id":84697,"date":"2025-06-01T02:46:30","date_gmt":"2025-06-01T02:46:30","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=84697"},"modified":"2025-06-01T02:46:30","modified_gmt":"2025-06-01T02:46:30","slug":"which-of-the-following-statements-is-are-correct-1-in-june-2016-t","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/","title":{"rendered":"Which of the following statements is\/are correct?\n  1. In June 2016, t"},"content":{"rendered":"<p>Which of the following statements is\/are correct?<\/p>\n<ul>\n<li>1. In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves.<\/li>\n<li>2. Gravitational waves were generated due to merger of two black holes at about 1.4 billion light-years distant.<\/li>\n<li>3. Gravitational waves were inserted due to collision of two white dwarf stars at about 1.4 billion light-years distant.<\/li>\n<\/ul>\n<p>Select the correct answer using the code given below.<\/p>\n<p>[amp_mcq option1=&#8221;1 only&#8221; option2=&#8221;1 and 2 only&#8221; option3=&#8221;2 and 3 only&#8221; option4=&#8221;1, 2 and 3&#8243; 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; 2017<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-cds-1-2017.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-cds-1-2017\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later.<\/section>\n<section id=\"pyq-key-points\">Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.<\/section>\n<section id=\"pyq-additional-information\">The detection of gravitational waves provided strong evidence for Einstein&#8217;s theory of general relativity and opened up a new window for observing the universe, leading to the Nobel Prize in Physics 2017 for the founders of the LIGO project.<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following statements is\/are correct? 1. In June 2016, the LIGO group of scientists announced the detection of a second set of gravitational waves. 2. Gravitational waves were generated due to merger of two black holes at about 1.4 billion light-years distant. 3. Gravitational waves were inserted due to collision of two white &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Which of the following statements is\/are correct?\n  1. In June 2016, t\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/#more-84697\">Detailed Solution<span class=\"screen-reader-text\">Which of the following statements is\/are correct?<br \/>\n  1. In June 2016, t<\/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":[1101,1198],"class_list":["post-84697","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1101","tag-space-technology","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 of the following statements is\/are correct?  1. In June 2016, t<\/title>\n<meta name=\"description\" content=\"Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later. Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.\" \/>\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-of-the-following-statements-is-are-correct-1-in-june-2016-t\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which of the following statements is\/are correct?  1. In June 2016, t\" \/>\n<meta property=\"og:description\" content=\"Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later. Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T02:46:30+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 of the following statements is\/are correct?  1. In June 2016, t","description":"Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later. Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.","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-of-the-following-statements-is-are-correct-1-in-june-2016-t\/","og_locale":"en_US","og_type":"article","og_title":"Which of the following statements is\/are correct?  1. In June 2016, t","og_description":"Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later. Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T02:46:30+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-of-the-following-statements-is-are-correct-1-in-june-2016-t\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/","name":"Which of the following statements is\/are correct? 1. In June 2016, t","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T02:46:30+00:00","dateModified":"2025-06-01T02:46:30+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Statement 1 is correct; the LIGO (Laser Interferometer Gravitational-Wave Observatory) collaboration announced the detection of the second set of gravitational waves (GW151226, detected in December 2015) in June 2016, following the historic first detection announcement (GW150914, detected in September 2015, announced Feb 2016). Statement 2 is correct; both the first and second gravitational waves detected by LIGO were attributed to the merger of two black holes. The second detection (GW151226) involved black holes estimated to be about 1.4 billion light-years away. Statement 3 is incorrect; the gravitational waves detected by LIGO up to that point were from the merger of stellar-mass black holes, not white dwarf stars. Mergers involving neutron stars were detected later. Gravitational waves detected by LIGO in its initial phase were primarily generated by the violent merger of massive compact objects, specifically black holes.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-is-are-correct-1-in-june-2016-t\/#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 of the following statements is\/are correct? 1. 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