{"id":88142,"date":"2025-06-01T07:03:17","date_gmt":"2025-06-01T07:03:17","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88142"},"modified":"2025-06-01T07:03:17","modified_gmt":"2025-06-01T07:03:17","slug":"the-silvering-in-thermos-flasks-is-done-to-avoid-heat-transfer-by","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-silvering-in-thermos-flasks-is-done-to-avoid-heat-transfer-by\/","title":{"rendered":"The silvering in thermos flasks is done to avoid heat transfer by:"},"content":{"rendered":"

The silvering in thermos flasks is done to avoid heat transfer by:<\/p>\n

[amp_mcq option1=”Convection” option2=”Conduction” option3=”Radiation” option4=”Both convection and conduction” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is C. The silvering in thermos flasks is done to avoid heat transfer by radiation.
\n<\/section>\n
\n– A thermos flask is designed to minimize heat transfer through all three mechanisms: conduction, convection, and radiation.
\n– The vacuum between the double walls reduces heat transfer by conduction and convection.
\n– The stopper reduces convection (and some conduction).
\n– The silvered surfaces (typically vacuum-deposited aluminum) on the inner and outer walls are poor emitters and excellent reflectors of thermal radiation. This significantly reduces heat transfer by radiation across the vacuum.
\n<\/section>\n
\nThermal radiation is heat transferred in the form of electromagnetic waves. Shiny, reflective surfaces are effective at minimizing radiation transfer because they absorb very little and reflect most of the incident radiation.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The silvering in thermos flasks is done to avoid heat transfer by: [amp_mcq option1=”Convection” option2=”Conduction” option3=”Radiation” option4=”Both convection and conduction” correct=”option3″] This question was previously asked in UPSC NDA-2 – 2015 Download PDFAttempt Online The correct answer is C. The silvering in thermos flasks is done to avoid heat transfer by radiation. – A thermos … <\/p>\n

Detailed SolutionThe silvering in thermos flasks is done to avoid heat transfer by:<\/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":[1443,1130,1128],"class_list":["post-88142","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1443","tag-heat-and-thermodynamics","tag-physics","no-featured-image-padding"],"yoast_head":"\nThe silvering in thermos flasks is done to avoid heat transfer by:<\/title>\n<meta name=\"description\" content=\"The correct answer is C. The silvering in thermos flasks is done to avoid heat transfer by radiation. - A thermos flask is designed to minimize heat transfer through all three mechanisms: conduction, convection, and radiation. - The vacuum between the double walls reduces heat transfer by conduction and convection. - The stopper reduces convection (and some conduction). - The silvered surfaces (typically vacuum-deposited aluminum) on the inner and outer walls are poor emitters and excellent reflectors of thermal radiation. This significantly reduces heat transfer by radiation across the vacuum.\" \/>\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-silvering-in-thermos-flasks-is-done-to-avoid-heat-transfer-by\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The silvering in thermos flasks is done to avoid heat transfer by:\" \/>\n<meta property=\"og:description\" content=\"The correct answer is C. The silvering in thermos flasks is done to avoid heat transfer by radiation. - A thermos flask is designed to minimize heat transfer through all three mechanisms: conduction, convection, and radiation. - The vacuum between the double walls reduces heat transfer by conduction and convection. - The stopper reduces convection (and some conduction). - The silvered surfaces (typically vacuum-deposited aluminum) on the inner and outer walls are poor emitters and excellent reflectors of thermal radiation. 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The silvering in thermos flasks is done to avoid heat transfer by radiation. - A thermos flask is designed to minimize heat transfer through all three mechanisms: conduction, convection, and radiation. - The vacuum between the double walls reduces heat transfer by conduction and convection. - The stopper reduces convection (and some conduction). - The silvered surfaces (typically vacuum-deposited aluminum) on the inner and outer walls are poor emitters and excellent reflectors of thermal radiation. 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