{"id":85418,"date":"2025-06-01T03:16:24","date_gmt":"2025-06-01T03:16:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85418"},"modified":"2025-06-01T03:16:24","modified_gmt":"2025-06-01T03:16:24","slug":"if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/","title":{"rendered":"If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th"},"content":{"rendered":"

If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be the time at 90\u00b0 E longitude?<\/p>\n

[amp_mcq option1=”5:00 a.m.” option2=”4:00 a.m.” option3=”3:00 p.m.” option4=”4:00 p.m.” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe Earth rotates 360 degrees in 24 hours. This means it rotates 15 degrees in one hour (360\/24 = 15), or 1 degree every 4 minutes (60\/15 = 4). Longitudes to the east of GMT are ahead in time, and longitudes to the west are behind. The difference in longitude between GMT (0\u00b0) and 90\u00b0 E is 90\u00b0. The time difference is (90\/15) hours = 6 hours. Since 90\u00b0 E is east of GMT, the time will be 6 hours ahead of GMT. If it is 10:00 a.m. at GMT, then at 90\u00b0 E, the time will be 10:00 a.m. + 6 hours = 4:00 p.m.
\n<\/section>\n
\nFor every 15 degrees of longitude, there is a time difference of one hour. Eastward travel adds time, while westward travel subtracts time.
\n<\/section>\n
\nGMT (Greenwich Mean Time) or UTC (Coordinated Universal Time) is the standard time at the prime meridian (0\u00b0 longitude). India’s standard time (IST) is 5.5 hours ahead of GMT, corresponding to 82.5\u00b0 E longitude (82.5 * 4 minutes = 330 minutes = 5 hours 30 minutes).
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be the time at 90\u00b0 E longitude? [amp_mcq option1=”5:00 a.m.” option2=”4:00 a.m.” option3=”3:00 p.m.” option4=”4:00 p.m.” correct=”option4″] This question was previously asked in UPSC CDS-1 – 2023 Download PDFAttempt Online The Earth rotates 360 degrees in 24 hours. This means it rotates … <\/p>\n

Detailed SolutionIf it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th<\/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":[1105,1359,1106],"class_list":["post-85418","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1105","tag-longitude","tag-world-and-physical-geography","no-featured-image-padding"],"yoast_head":"\nIf it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th<\/title>\n<meta name=\"description\" content=\"The Earth rotates 360 degrees in 24 hours. This means it rotates 15 degrees in one hour (360\/24 = 15), or 1 degree every 4 minutes (60\/15 = 4). Longitudes to the east of GMT are ahead in time, and longitudes to the west are behind. The difference in longitude between GMT (0\u00b0) and 90\u00b0 E is 90\u00b0. The time difference is (90\/15) hours = 6 hours. Since 90\u00b0 E is east of GMT, the time will be 6 hours ahead of GMT. If it is 10:00 a.m. at GMT, then at 90\u00b0 E, the time will be 10:00 a.m. + 6 hours = 4:00 p.m. For every 15 degrees of longitude, there is a time difference of one hour. Eastward travel adds time, while westward travel subtracts time.\" \/>\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\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th\" \/>\n<meta property=\"og:description\" content=\"The Earth rotates 360 degrees in 24 hours. This means it rotates 15 degrees in one hour (360\/24 = 15), or 1 degree every 4 minutes (60\/15 = 4). Longitudes to the east of GMT are ahead in time, and longitudes to the west are behind. The difference in longitude between GMT (0\u00b0) and 90\u00b0 E is 90\u00b0. The time difference is (90\/15) hours = 6 hours. Since 90\u00b0 E is east of GMT, the time will be 6 hours ahead of GMT. If it is 10:00 a.m. at GMT, then at 90\u00b0 E, the time will be 10:00 a.m. + 6 hours = 4:00 p.m. For every 15 degrees of longitude, there is a time difference of one hour. Eastward travel adds time, while westward travel subtracts time.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:16:24+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":"If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th","description":"The Earth rotates 360 degrees in 24 hours. This means it rotates 15 degrees in one hour (360\/24 = 15), or 1 degree every 4 minutes (60\/15 = 4). Longitudes to the east of GMT are ahead in time, and longitudes to the west are behind. The difference in longitude between GMT (0\u00b0) and 90\u00b0 E is 90\u00b0. The time difference is (90\/15) hours = 6 hours. Since 90\u00b0 E is east of GMT, the time will be 6 hours ahead of GMT. If it is 10:00 a.m. at GMT, then at 90\u00b0 E, the time will be 10:00 a.m. + 6 hours = 4:00 p.m. For every 15 degrees of longitude, there is a time difference of one hour. Eastward travel adds time, while westward travel subtracts time.","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\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/","og_locale":"en_US","og_type":"article","og_title":"If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th","og_description":"The Earth rotates 360 degrees in 24 hours. This means it rotates 15 degrees in one hour (360\/24 = 15), or 1 degree every 4 minutes (60\/15 = 4). Longitudes to the east of GMT are ahead in time, and longitudes to the west are behind. The difference in longitude between GMT (0\u00b0) and 90\u00b0 E is 90\u00b0. The time difference is (90\/15) hours = 6 hours. Since 90\u00b0 E is east of GMT, the time will be 6 hours ahead of GMT. If it is 10:00 a.m. at GMT, then at 90\u00b0 E, the time will be 10:00 a.m. + 6 hours = 4:00 p.m. For every 15 degrees of longitude, there is a time difference of one hour. Eastward travel adds time, while westward travel subtracts time.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:16:24+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\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/","url":"https:\/\/exam.pscnotes.com\/mcq\/if-it-is-1000-a-m-at-greenwich-mean-time-gmt-then-what-will-be-th\/","name":"If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be th","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:16:24+00:00","dateModified":"2025-06-01T03:16:24+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The Earth rotates 360 degrees in 24 hours. 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