{"id":90005,"date":"2025-06-01T10:18:58","date_gmt":"2025-06-01T10:18:58","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90005"},"modified":"2025-06-01T10:18:58","modified_gmt":"2025-06-01T10:18:58","slug":"a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/","title":{"rendered":"A Barometer kept in an elevator reads 760 mm when the elevator is at r"},"content":{"rendered":"

A Barometer kept in an elevator reads 760 mm when the elevator is at rest. When the elevator moves in the upward direction with increasing speed, the reading of the Barometer will be:<\/p>\n

[amp_mcq option1=”760 mm” option2=”< 760 mm\" option3=\"> 760 mm” option4=”Zero” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2016<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. A barometer measures the pressure exerted by the column of air above it. In the upward accelerating frame of reference, the effective acceleration of gravity is (g + a), where g is the standard acceleration due to gravity and a is the upward acceleration of the elevator. The pressure exerted by the air column is proportional to this effective gravity. Therefore, the air pressure measured by the barometer will be higher than the normal atmospheric pressure (760 mm Hg) measured when the elevator is at rest.
\n<\/section>\n
\nThis question tests the understanding of apparent weight and pressure measurement in accelerating reference frames.
\n<\/section>\n
\nIf the elevator were moving downwards with increasing speed (accelerating downwards), the apparent weight and measured pressure would decrease (reading < 760 mm). If the elevator were moving at a constant velocity (up or down), the acceleration would be zero, and the reading would remain 760 mm. If the elevator were falling freely (a = -g), the apparent weight and pressure would be zero.\n<\/section>\n","protected":false},"excerpt":{"rendered":"

A Barometer kept in an elevator reads 760 mm when the elevator is at rest. When the elevator moves in the upward direction with increasing speed, the reading of the Barometer will be: [amp_mcq option1=”760 mm” option2=”< 760 mm\" option3=\"> 760 mm” option4=”Zero” correct=”option3″] This question was previously asked in UPSC CAPF – 2016 Download … <\/p>\n

Detailed SolutionA Barometer kept in an elevator reads 760 mm when the elevator is at r<\/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":[1085],"tags":[1098,1236,1128],"class_list":["post-90005","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1098","tag-measuring-instruments-and-scales","tag-physics","no-featured-image-padding"],"yoast_head":"\nA Barometer kept in an elevator reads 760 mm when the elevator is at r<\/title>\n<meta name=\"description\" content=\"When the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. A barometer measures the pressure exerted by the column of air above it. In the upward accelerating frame of reference, the effective acceleration of gravity is (g + a), where g is the standard acceleration due to gravity and a is the upward acceleration of the elevator. The pressure exerted by the air column is proportional to this effective gravity. Therefore, the air pressure measured by the barometer will be higher than the normal atmospheric pressure (760 mm Hg) measured when the elevator is at rest. This question tests the understanding of apparent weight and pressure measurement in accelerating reference frames.\" \/>\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\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Barometer kept in an elevator reads 760 mm when the elevator is at r\" \/>\n<meta property=\"og:description\" content=\"When the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. A barometer measures the pressure exerted by the column of air above it. In the upward accelerating frame of reference, the effective acceleration of gravity is (g + a), where g is the standard acceleration due to gravity and a is the upward acceleration of the elevator. The pressure exerted by the air column is proportional to this effective gravity. Therefore, the air pressure measured by the barometer will be higher than the normal atmospheric pressure (760 mm Hg) measured when the elevator is at rest. This question tests the understanding of apparent weight and pressure measurement in accelerating reference frames.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:18:58+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":"A Barometer kept in an elevator reads 760 mm when the elevator is at r","description":"When the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. 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This question tests the understanding of apparent weight and pressure measurement in accelerating reference frames.","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\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/","og_locale":"en_US","og_type":"article","og_title":"A Barometer kept in an elevator reads 760 mm when the elevator is at r","og_description":"When the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. A barometer measures the pressure exerted by the column of air above it. In the upward accelerating frame of reference, the effective acceleration of gravity is (g + a), where g is the standard acceleration due to gravity and a is the upward acceleration of the elevator. The pressure exerted by the air column is proportional to this effective gravity. Therefore, the air pressure measured by the barometer will be higher than the normal atmospheric pressure (760 mm Hg) measured when the elevator is at rest. This question tests the understanding of apparent weight and pressure measurement in accelerating reference frames.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:18:58+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\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/","url":"https:\/\/exam.pscnotes.com\/mcq\/a-barometer-kept-in-an-elevator-reads-760-mm-when-the-elevator-is-at-r\/","name":"A Barometer kept in an elevator reads 760 mm when the elevator is at r","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:18:58+00:00","dateModified":"2025-06-01T10:18:58+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"When the elevator moves upward with increasing speed (i.e., it is accelerating upwards), the apparent weight of objects inside the elevator increases. 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