{"id":86994,"date":"2025-06-01T04:25:05","date_gmt":"2025-06-01T04:25:05","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86994"},"modified":"2025-06-01T04:25:05","modified_gmt":"2025-06-01T04:25:05","slug":"which-one-of-the-following-schematic-graphs-correctly-represents-quali","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/","title":{"rendered":"Which one of the following schematic graphs correctly represents quali"},"content":{"rendered":"

Which one of the following schematic graphs correctly represents qualitatively the variation of resistivity \u03c1 with respect to temperature T for a semiconductor?<\/p>\n

[amp_mcq option1=”Graph (a)” option2=”Graph (b)” option3=”Graph (c)” option4=”Graph (d)” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is (B) Graph (b).
\n<\/section>\n
\nFor a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. Graph (b) qualitatively shows this inverse relationship where resistivity decreases with increasing temperature.
\n<\/section>\n
\nIn contrast, for a typical metal, resistivity increases with increasing temperature due to increased scattering of electrons by lattice vibrations. Insulators have very high resistivity that changes significantly with temperature, usually decreasing as temperature increases, but starting from a much higher value than semiconductors. Graph (a) represents the behavior of a metal, while graphs (c) and (d) do not represent the typical qualitative behavior of a semiconductor over a relevant temperature range.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following schematic graphs correctly represents qualitatively the variation of resistivity \u03c1 with respect to temperature T for a semiconductor? [amp_mcq option1=”Graph (a)” option2=”Graph (b)” option3=”Graph (c)” option4=”Graph (d)” correct=”option4″] This question was previously asked in UPSC Geoscientist – 2023 Download PDFAttempt Online The correct answer is (B) Graph (b). For a … <\/p>\n

Detailed SolutionWhich one of the following schematic graphs correctly represents quali<\/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":[1091],"tags":[1105,1160,1128],"class_list":["post-86994","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1105","tag-physical-properties-of-materials","tag-physics","no-featured-image-padding"],"yoast_head":"\nWhich one of the following schematic graphs correctly represents quali<\/title>\n<meta name=\"description\" content=\"The correct answer is (B) Graph (b). For a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. Graph (b) qualitatively shows this inverse relationship where resistivity decreases with increasing temperature.\" \/>\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\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following schematic graphs correctly represents quali\" \/>\n<meta property=\"og:description\" content=\"The correct answer is (B) Graph (b). For a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. Graph (b) qualitatively shows this inverse relationship where resistivity decreases with increasing temperature.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:25:05+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":"Which one of the following schematic graphs correctly represents quali","description":"The correct answer is (B) Graph (b). For a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. Graph (b) qualitatively shows this inverse relationship where resistivity decreases with increasing temperature.","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\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following schematic graphs correctly represents quali","og_description":"The correct answer is (B) Graph (b). For a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. Graph (b) qualitatively shows this inverse relationship where resistivity decreases with increasing temperature.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T04:25:05+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\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-schematic-graphs-correctly-represents-quali\/","name":"Which one of the following schematic graphs correctly represents quali","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T04:25:05+00:00","dateModified":"2025-06-01T04:25:05+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is (B) Graph (b). For a semiconductor, resistivity generally decreases as temperature increases. This is because increasing thermal energy excites more electrons into the conduction band and creates more holes in the valence band, increasing the number of free charge carriers available for conduction. More charge carriers lead to higher conductivity and thus lower resistivity. 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