{"id":4435,"date":"2016-05-16T09:49:00","date_gmt":"2016-05-16T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/"},"modified":"2018-10-22T14:45:18","modified_gmt":"2018-10-22T09:15:18","slug":"ncert-solutions-class-12-physics-electronic-devices","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/","title":{"rendered":"NCERT Solutions class-12 physics Electronic Devices"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/#NCERT_Class_12_Physics_Chapter-wise_Solutions\" >NCERT Class 12 Physics Chapter-wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/#CHAPTER_14_SEMICONDUCTOR_ELECTRONICS_MATERIALS_DEVICES_AND_SIMPLE_CIRCUITS\" >CHAPTER 14 SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/#NCERT_Solutions_class-12_physics_Electronic_Devices\" >NCERT Solutions class-12 physics Electronic Devices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-12-physics-electronic-devices\/#NCERT_Solutions_for_Class_12_Physics\" >NCERT Solutions for Class 12 Physics<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions class-12 physics Electronic Devices Class 12 Physics book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 12 Physics chapter wise NCERT solution for Physics part 1 and Physics part 2 for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/ncert-solutions\/5\/\">NCERT solutions for\u00a0Electronic Devices\u00a0<\/a>as PDF.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/Class%2012%20physics%20book%2012.jpg\" alt=\"NCERT Solutions class-12 physics Electronic Devices\" width=\"130\" height=\"159\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_12_Physics_Chapter-wise_Solutions\"><\/span><strong>NCERT Class 12 Physics Chapter-wise Solutions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Electric Charges and Fields<\/li>\n<li>2 \u2013 Electrostatic Potential and Capacitance<\/li>\n<li>3 \u2013 Current Electricity<\/li>\n<li>4 \u2013 Moving Charges and Magnetism<\/li>\n<li>5 \u2013 Magnetism and Matter<\/li>\n<li>6 \u2013 Electromagnetic Induction<\/li>\n<li>7 \u2013 Alternating Current<\/li>\n<li>8 \u2013 Electromagnetic Waves<\/li>\n<li>9 \u2013 Ray Optics and Optical Instruments<\/li>\n<li>10 \u2013 Wave Optics<\/li>\n<li>11 \u2013 Dual Nature of Radiation and Matter<\/li>\n<li>12 \u2013 Atoms<\/li>\n<li>13 \u2013 Nuclei<\/li>\n<li>14 \u2013 Semiconductor Electronic: Material, Devices and Simple Circuits<\/li>\n<li>15 \u2013 Communication Systems<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CHAPTER_14_SEMICONDUCTOR_ELECTRONICS_MATERIALS_DEVICES_AND_SIMPLE_CIRCUITS\"><\/span>CHAPTER 14 SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>14.1 Introduction<\/li>\n<li>14.2 Classification of Metals, Conductors and Semiconductors<\/li>\n<li>14.3 Intrinsic Semiconductor<\/li>\n<li>14.4 Extrinsic Semiconductor<\/li>\n<li>14.5 p-n Junction<\/li>\n<li>14.6 Semiconductor diode<\/li>\n<li>14.7 Application of Junction Diode as a Rectifier<\/li>\n<li>14.8 Special Purpose p-n Junction Diodes<\/li>\n<li>14.9 Junction Transistor<\/li>\n<li>14.10 Digital Electronics and Logic Gates<\/li>\n<li>14.11 Integrated Circuits<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_class-12_physics_Electronic_Devices\"><\/span>NCERT Solutions class-12 physics Electronic Devices<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">\u00a01:\u00a0In an n-type silicon, which of the following statement is true:<\/p>\n<p style=\"text-align: justify;\">(a) Electrons are majority carriers and trivalent atoms are the dopants.<\/p>\n<p style=\"text-align: justify;\">(b) Electrons are minority carriers and pentavalent atoms are the dopants.<\/p>\n<p style=\"text-align: justify;\">(c) Holes are minority carriers and pentavalent atoms are the dopants.<\/p>\n<p style=\"text-align: justify;\">(d) Holes are majority carriers and trivalent atoms are the dopants.<\/p>\n<p style=\"text-align: justify;\">2:\u00a0Which of the statements given in Exercise 14.1 is true for p-type semiconductors.<\/p>\n<p style=\"text-align: justify;\">3:\u00a0Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to <img decoding=\"async\" style=\"height: 31px; width: 181px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image001.png\" \/>Which of the following statements is true?<\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 24px; width: 213px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image002.png\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 25px; width: 201px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image003.png\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 24px; width: 199px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image004.png\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 24px; width: 213px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image005.png\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\">4:\u00a0In an unbiased p-n junction, holes diffuse from the p-region to n-region because<\/p>\n<p style=\"text-align: justify;\">(a) free electrons in the n-region attract them.<\/p>\n<p style=\"text-align: justify;\">(b) they move across the junction by the potential difference.<\/p>\n<p style=\"text-align: justify;\">(c) hole concentration in p-region is more as compared to n-region.<\/p>\n<p style=\"text-align: justify;\">(d) All the above.<\/p>\n<p style=\"text-align: justify;\">5:\u00a0When a forward bias is applied to a p-n junction, it<\/p>\n<p style=\"text-align: justify;\">(a) raises the potential barrier.<\/p>\n<p style=\"text-align: justify;\">(b) reduces the majority carrier current to zero.<\/p>\n<p style=\"text-align: justify;\">(c) lowers the potential barrier.<\/p>\n<p style=\"text-align: justify;\">(d) None of the above.<\/p>\n<p style=\"text-align: justify;\">6:\u00a0For transistor action, which of the following statements are correct:<\/p>\n<p style=\"text-align: justify;\">(a) Base, emitter and collector regions should have similar size and doping concentrations.<\/p>\n<p style=\"text-align: justify;\">(b) The base region must be very thin and lightly doped.<\/p>\n<p style=\"text-align: justify;\">(c) The emitter junction is forward biased and collector junction is reverse biased.<\/p>\n<p style=\"text-align: justify;\">(d) Both the emitter junction as well as the collector junction are forward biased.<\/p>\n<p style=\"text-align: justify;\">7:\u00a0\u00a0For a transistor amplifier, the voltage gain<\/p>\n<p style=\"text-align: justify;\">(a) remains constant for all frequencies.<\/p>\n<p style=\"text-align: justify;\">(b) is high at high and low frequencies and constant in the middle frequency range.<\/p>\n<p style=\"text-align: justify;\">(c) is low at high and low frequencies and constant at mid frequencies.<\/p>\n<p style=\"text-align: justify;\">(d) None of the above.<\/p>\n<p style=\"text-align: justify;\">8:\u00a0In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.<\/p>\n<p style=\"text-align: justify;\">9: For a CE-transistor amplifier, the audio signal voltage across the collected resistance of 2 <img decoding=\"async\" style=\"height: 18px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image008.png\" \/>is 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current, if the base resistance is 1<img decoding=\"async\" style=\"height: 18px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image009.png\" \/>.<\/p>\n<p style=\"text-align: justify;\">10:\u00a0Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.<\/p>\n<p style=\"text-align: justify;\">11:\u00a0A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?<\/p>\n<p style=\"text-align: justify;\">12:\u00a0The number of silicon atoms per<img decoding=\"async\" style=\"height: 21px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image038.png\" \/>. This is doped simultaneously with <img decoding=\"async\" style=\"height: 21px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image039.png\" \/>\u00a0atoms per <img decoding=\"async\" style=\"height: 20px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image040.png\" \/>of Arsenic and <img decoding=\"async\" style=\"height: 24px; width: 104px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image041.png\" \/>atoms of Indium. Calculate the number of electrons and holes. Given that<img decoding=\"async\" style=\"height: 25px; width: 124px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image042.png\" \/>. Is the material n-type or p-type?<\/p>\n<p style=\"text-align: justify;\">13:\u00a0In an intrinsic semiconductor the energy gap <img decoding=\"async\" style=\"height: 25px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image054.png\" \/>is 1.2 eV. Its hole mobility is much smaller than electron mobility and independent of temperature. What is the ratio between conductivity at 600K and that at 300K? Assume that the temperature dependence of intrinsic carrier concentration <em><img decoding=\"async\" style=\"height: 24px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image055.png\" \/><\/em>is given by <img decoding=\"async\" style=\"height: 51px; width: 124px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image056.png\" \/>, where <img decoding=\"async\" style=\"height: 24px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image057.png\" \/>is a constant.<\/p>\n<p style=\"text-align: justify;\">14:\u00a0In a p-n junction diode, the current I can be expressed as<\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 51px; width: 140px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image070.png\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\">where <em>I<\/em>0 is called the reverse saturation current, <em>V<\/em> is the voltage across the diode and is positive for forward bias and negative for reverse bias, and <em>I<\/em> is the current through the diode, <em>k <\/em>Bis the Boltzmann constant <img decoding=\"async\" style=\"height: 21px; width: 120px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image071.png\" \/>) and T is the absolute temperature. If for a given diode <img decoding=\"async\" style=\"height: 25px; width: 132px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image072.png\" \/>and T = 300 K, then<\/p>\n<p style=\"text-align: justify;\">(a) What will be the forward current at a forward voltage of 0.6 V?<\/p>\n<p style=\"text-align: justify;\">(b) What will be the increase in the current if the voltage across the diode is increased to 0.7 V?<\/p>\n<p style=\"text-align: justify;\">(c) What is the dynamic resistance?<\/p>\n<p style=\"text-align: justify;\">(d) What will be the current if reverse bias voltage changes from 1 V to 2 V?<\/p>\n<p style=\"text-align: justify;\">15:\u00a0\u00a0You are given the two circuits as shown in Fig. 14.44. Show that circuit (a) acts as OR gate while the circuit (b) acts as AND gate.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 204\" style=\"height: 50px; width: 175px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image085.jpg\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 201\" style=\"height: 57px; width: 154px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image086.jpg\" \/><\/p>\n<p style=\"text-align: justify;\">16:\u00a0Write the truth table for a NAND gate connected as given in Fig. 14.45.<\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" id=\"Picture 29\" style=\"height: 46px; width: 195px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image092.jpg\" alt=\"14148527422956.jpg\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\">Hence identify the exact logic operation carried out by this circuit.<\/p>\n<p style=\"text-align: justify;\">17:\u00a0\u00a0You are given two circuits as shown in Fig. 14.46, which consist of NAND gates. Identify the logic operation carried out by the two circuits.<\/p>\n<p><strong><img decoding=\"async\" id=\"Picture 216\" style=\"height: 58px; width: 148px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image097.jpg\" \/><\/strong><\/p>\n<p><strong><img decoding=\"async\" id=\"Picture 219\" style=\"height: 72px; width: 148px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image098.jpg\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\">18 :\u00a0\u00a0\u00a0\u00a0 Write the truth table for circuit given in Fig. 14.47 below consisting of NOR gates and identify the logic operation (OR, AND, NOT) which this circuit is performing.<\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" id=\"Picture 42\" style=\"height: 67px; width: 233px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image106.jpg\" alt=\"14148527705048.jpg\" \/><\/strong><\/p>\n<p style=\"text-align: justify;\">(Hint: A = 0, B = 1 then A and B inputs of second NOR gate will be 0 and hence Y=1. Similarly work out the values of Y for other combinations of A and B. Compare with the truth table of OR, AND, NOT gates and find the correct one.)<\/p>\n<p style=\"text-align: justify;\">19:\u00a0Write the truth table for the circuits given in Fig. 14.48 consisting of NOR gates only. Identify the logic operations (OR, AND, NOT) performed by the two circuits.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 234\" style=\"height: 79px; width: 168px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image110.jpg\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 237\" style=\"height: 101px; width: 200px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/12\/physics\/ch14\/image111.jpg\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_12_Physics\"><\/span><strong>NCERT Solutions for Class 12 Physics<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 12 Physics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 12 physics includes text book solutions from both part 1 and part 2. NCERT Solutions for CBSE Class 12 Physics have total 20 chapters. 12 Physics NCERT Solutions in PDF for free Download on our website. Ncert physics class 12 solutions PDF and physics ncert class 12 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide<\/p>\n<p>To download\u00a0NCERT Solutions for class 12 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home Science; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions class-12 physics Electronic Devices Class 12 Physics book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. 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