{"id":88434,"date":"2025-06-01T07:11:08","date_gmt":"2025-06-01T07:11:08","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88434"},"modified":"2025-06-01T07:11:08","modified_gmt":"2025-06-01T07:11:08","slug":"the-following-six-6-items-consist-of-two-statements-statement-i-and-6","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/","title":{"rendered":"The following six (6) items consist of two statements, Statement I and"},"content":{"rendered":"

The following six (6) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below.
\nStatement I :
\nGeostrophic wind blows above a height of 600 metres, parallel to the isobars.
\nStatement II :
\nGeostrophic wind is the horizontal wind velocity, in which the Coriolis force balances the horizontal pressure force.<\/p>\n

[amp_mcq option1=”Both the statements are individually true and Statement II is the correct explanation of Statement I” option2=”Both the statements are individually true but Statement II is not the correct explanation of Statement I” option3=”Statement I is true but Statement II is false” option4=”Statement I is false but Statement II is true” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nStatement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. It is typically a good approximation of the wind speed and direction in the atmosphere above the friction layer (usually considered to be above 600-1000 meters), where the effects of surface friction are negligible. Statement II is true: The geostrophic wind occurs when the pressure gradient force (air moves from high to low pressure) is exactly balanced by the Coriolis force (deflection due to Earth’s rotation). This balance is the fundamental definition of geostrophic flow. Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer.
\n<\/section>\n
\n– Pressure Gradient Force (PGF) drives air from high pressure to low pressure.
\n– Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
\n– In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector).
\n– Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.
\n<\/section>\n
\nBelow the friction layer (in the atmospheric boundary layer), friction acts to slow down the wind, which reduces the Coriolis force. This imbalance causes the wind to blow across the isobars towards lower pressure, not parallel to them.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The following six (6) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below. Statement I : Geostrophic wind blows above a height of 600 metres, parallel to the isobars. Statement II : Geostrophic wind is the horizontal wind velocity, … <\/p>\n

Detailed SolutionThe following six (6) items consist of two statements, Statement I and<\/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":[1114,1158,1106],"class_list":["post-88434","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1114","tag-winds","tag-world-and-physical-geography","no-featured-image-padding"],"yoast_head":"\nThe following six (6) items consist of two statements, Statement I and<\/title>\n<meta name=\"description\" content=\"Statement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. It is typically a good approximation of the wind speed and direction in the atmosphere above the friction layer (usually considered to be above 600-1000 meters), where the effects of surface friction are negligible. Statement II is true: The geostrophic wind occurs when the pressure gradient force (air moves from high to low pressure) is exactly balanced by the Coriolis force (deflection due to Earth's rotation). This balance is the fundamental definition of geostrophic flow. Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer. - Pressure Gradient Force (PGF) drives air from high pressure to low pressure. - Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. - In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector). - Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.\" \/>\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\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The following six (6) items consist of two statements, Statement I and\" \/>\n<meta property=\"og:description\" content=\"Statement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. It is typically a good approximation of the wind speed and direction in the atmosphere above the friction layer (usually considered to be above 600-1000 meters), where the effects of surface friction are negligible. Statement II is true: The geostrophic wind occurs when the pressure gradient force (air moves from high to low pressure) is exactly balanced by the Coriolis force (deflection due to Earth's rotation). This balance is the fundamental definition of geostrophic flow. Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer. - Pressure Gradient Force (PGF) drives air from high pressure to low pressure. - Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. - In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector). - Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:11:08+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":"The following six (6) items consist of two statements, Statement I and","description":"Statement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. It is typically a good approximation of the wind speed and direction in the atmosphere above the friction layer (usually considered to be above 600-1000 meters), where the effects of surface friction are negligible. Statement II is true: The geostrophic wind occurs when the pressure gradient force (air moves from high to low pressure) is exactly balanced by the Coriolis force (deflection due to Earth's rotation). This balance is the fundamental definition of geostrophic flow. Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer. - Pressure Gradient Force (PGF) drives air from high pressure to low pressure. - Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. - In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector). - Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.","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\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/","og_locale":"en_US","og_type":"article","og_title":"The following six (6) items consist of two statements, Statement I and","og_description":"Statement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. 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Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer. - Pressure Gradient Force (PGF) drives air from high pressure to low pressure. - Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. - In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector). - Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:11:08+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\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/","name":"The following six (6) items consist of two statements, Statement I and","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:11:08+00:00","dateModified":"2025-06-01T07:11:08+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Statement I is true: The geostrophic wind is a theoretical horizontal wind that flows parallel to the isobars. 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Statement II provides the physical principle that explains why the geostrophic wind (as described in Statement I) blows parallel to the isobars above the friction layer. - Pressure Gradient Force (PGF) drives air from high pressure to low pressure. - Coriolis Force (CF) acts perpendicular to the wind direction, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. - In geostrophic balance, PGF and CF are equal in magnitude and opposite in direction (acting on the wind vector). - Friction is negligible above the boundary layer, allowing geostrophic balance to be achieved.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-following-six-6-items-consist-of-two-statements-statement-i-and-6\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-2\/"},{"@type":"ListItem","position":3,"name":"The following six (6) items consist of two statements, Statement I and"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=88434"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88434\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}