{"id":85588,"date":"2025-06-01T03:22:09","date_gmt":"2025-06-01T03:22:09","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85588"},"modified":"2025-06-01T03:22:09","modified_gmt":"2025-06-01T03:22:09","slug":"in-a-bipolar-junction-transistor","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bipolar-junction-transistor\/","title":{"rendered":"In a bipolar junction transistor"},"content":{"rendered":"

In a bipolar junction transistor<\/p>\n

[amp_mcq option1=”all the three regions (the emitter, the base and the collector) have equal concentrations of impurity” option2=”the emitter has the least concentration of impurity” option3=”the collector has the least concentration of impurity” option4=”the base has the least concentration of impurity” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2016<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nIn a bipolar junction transistor (BJT), the base region has the least concentration of impurity.
\n<\/section>\n
\n– A BJT consists of three semiconductor regions: the emitter, the base, and the collector, separated by two p-n junctions.
\n– These regions are doped with impurities (donors or acceptors) to create n-type and p-type semiconductors.
\n– The doping levels are designed specifically for the transistor’s operation:
\n – Emitter: Heavily doped (high concentration) to efficiently inject charge carriers (electrons or holes) into the base.
\n – Base: Lightly doped (low concentration) and made very thin to allow most injected carriers from the emitter to reach the collector and to minimize recombination within the base.
\n – Collector: Moderately doped (intermediate concentration, less than emitter but more than base) and typically larger in size to collect the carriers from the base and dissipate heat.
\n<\/section>\n
\nThe doping profile and physical geometry of the emitter, base, and collector regions are crucial for the performance of a bipolar junction transistor, determining its gain, operating speed, and power handling capabilities.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

In a bipolar junction transistor [amp_mcq option1=”all the three regions (the emitter, the base and the collector) have equal concentrations of impurity” option2=”the emitter has the least concentration of impurity” option3=”the collector has the least concentration of impurity” option4=”the base has the least concentration of impurity” correct=”option4″] This question was previously asked in UPSC CDS-2 … <\/p>\n

Detailed SolutionIn a bipolar junction transistor<\/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":[1088],"tags":[1098,1160,1128],"class_list":["post-85588","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1098","tag-physical-properties-of-materials","tag-physics","no-featured-image-padding"],"yoast_head":"\nIn a bipolar junction transistor<\/title>\n<meta name=\"description\" content=\"In a bipolar junction transistor (BJT), the base region has the least concentration of impurity. - A BJT consists of three semiconductor regions: the emitter, the base, and the collector, separated by two p-n junctions. - These regions are doped with impurities (donors or acceptors) to create n-type and p-type semiconductors. - The doping levels are designed specifically for the transistor's operation: - Emitter: Heavily doped (high concentration) to efficiently inject charge carriers (electrons or holes) into the base. - Base: Lightly doped (low concentration) and made very thin to allow most injected carriers from the emitter to reach the collector and to minimize recombination within the base. - Collector: Moderately doped (intermediate concentration, less than emitter but more than base) and typically larger in size to collect the carriers from the base and dissipate heat.\" \/>\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\/in-a-bipolar-junction-transistor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In a bipolar junction transistor\" \/>\n<meta property=\"og:description\" content=\"In a bipolar junction transistor (BJT), the base region has the least concentration of impurity. - A BJT consists of three semiconductor regions: the emitter, the base, and the collector, separated by two p-n junctions. - These regions are doped with impurities (donors or acceptors) to create n-type and p-type semiconductors. - The doping levels are designed specifically for the transistor's operation: - Emitter: Heavily doped (high concentration) to efficiently inject charge carriers (electrons or holes) into the base. - Base: Lightly doped (low concentration) and made very thin to allow most injected carriers from the emitter to reach the collector and to minimize recombination within the base. - Collector: Moderately doped (intermediate concentration, less than emitter but more than base) and typically larger in size to collect the carriers from the base and dissipate heat.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/in-a-bipolar-junction-transistor\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:22:09+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":"In a bipolar junction transistor","description":"In a bipolar junction transistor (BJT), the base region has the least concentration of impurity. - 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