{"id":85506,"date":"2025-06-01T03:19:16","date_gmt":"2025-06-01T03:19:16","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85506"},"modified":"2025-06-01T03:19:16","modified_gmt":"2025-06-01T03:19:16","slug":"on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/","title":{"rendered":"On a day when I am in hurry to go to office, I have a fixed quantity o"},"content":{"rendered":"

On a day when I am in hurry to go to office, I have a fixed quantity of rice which was just cooked and kept in a bowl. In order to cool it quickly, which one of the following is the best option?<\/p>\n

[amp_mcq option1=”Let it be kept on the table in a room where there is no fan, no air conditioner” option2=”Let it be kept in a room with AC set at a temperature around 23 \u00b0C and a ceiling fan (or table fan) operating at slow speed” option3=”Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed” option4=”Let it be kept in a bowl of water at room temperature only” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed.
\n<\/section>\n
\nRapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water’s surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.
\n<\/section>\n
\nEvaporation is a very efficient cooling process as it requires a significant amount of latent heat to change water from liquid to gas phase, drawing heat from the surroundings. Convection is heat transfer through the movement of fluids (air or water); forced convection (with a fan) is faster than natural convection. Conduction is heat transfer through direct contact. Option C utilizes conduction, evaporation, and forced convection for maximum cooling speed.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

On a day when I am in hurry to go to office, I have a fixed quantity of rice which was just cooked and kept in a bowl. In order to cool it quickly, which one of the following is the best option? [amp_mcq option1=”Let it be kept on the table in a room where … <\/p>\n

Detailed SolutionOn a day when I am in hurry to go to office, I have a fixed quantity o<\/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":[1103,1130,1128],"class_list":["post-85506","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1103","tag-heat-and-thermodynamics","tag-physics","no-featured-image-padding"],"yoast_head":"\nOn a day when I am in hurry to go to office, I have a fixed quantity o<\/title>\n<meta name=\"description\" content=\"The correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed. Rapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water's surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.\" \/>\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\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On a day when I am in hurry to go to office, I have a fixed quantity o\" \/>\n<meta property=\"og:description\" content=\"The correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed. Rapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water's surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:19:16+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":"On a day when I am in hurry to go to office, I have a fixed quantity o","description":"The correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed. Rapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water's surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.","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\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/","og_locale":"en_US","og_type":"article","og_title":"On a day when I am in hurry to go to office, I have a fixed quantity o","og_description":"The correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed. Rapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water's surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:19:16+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\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/","url":"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/","name":"On a day when I am in hurry to go to office, I have a fixed quantity o","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:19:16+00:00","dateModified":"2025-06-01T03:19:16+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is C) Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed. Rapid cooling is achieved by maximizing the rate of heat transfer from the rice to the surroundings. Putting the bowl in a water bath (option C and D) allows for efficient heat transfer by conduction from the rice through the bowl to the water. Operating a fan (option B and C) increases the rate of convection of air over the surface, enhancing cooling. The combination of placing the bowl in water and using a fan is the most effective because the water bath provides good conductive heat transfer, and the fan significantly increases the rate of evaporation from the water's surface (which cools the water and thus the rice) and also enhances convective cooling of the rice itself.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/on-a-day-when-i-am-in-hurry-to-go-to-office-i-have-a-fixed-quantity-o\/#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":"On a day when I am in hurry to go to office, I have a fixed quantity o"}]},{"@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\/85506","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=85506"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85506\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=85506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=85506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=85506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}