{"id":1491,"date":"2023-12-13T19:25:50","date_gmt":"2023-12-13T13:55:50","guid":{"rendered":"http:\/\/physicscatalyst.com\/article\/?p=1491"},"modified":"2024-07-13T22:23:17","modified_gmt":"2024-07-13T16:53:17","slug":"class-12-cbse-conceptual-questions","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/article\/class-12-cbse-conceptual-questions\/","title":{"rendered":"Class 12 CBSE conceptual physics questions for board exams 2025"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Board exams are approaching. Here are a few questions\u00a0to solve\u00a0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 1.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">what is the amount of work done in moving $100 \\; \\mu C$ charge between two points 5 cm apart on an equipotential surface?\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 2.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What is the value of refractive index of medium of polarizing angle 60 degree?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 3.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">State two factors on which temperature of inversion of a thermocouple may depend.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 4.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In which direction would a compass needle align if taken to geographic (i) north and (ii) south pole?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 5.\u00a0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The instantaneous voltage from an A.C. source is given by E=300 sin 314t . What is the R.M.S. voltage of the source?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 6.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compare the radii of two nuclei with mass number 1 and 27 respectively.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 7.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How does energy gap in an intrinsic semiconductor vary, when doped with a pentavalent impurity.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 8.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the temperature of good conductor increases, how does the relaxation time of electrons in the conductor change.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 9.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Draw a labelled ray diagram showing the formation of image using a Newtonian type reflecting telescope.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 10.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The output voltage of an ideal transformer, connected to a 240 V A.C. is 24 V. When transformer is used to light a bulb with rating 24 V , 24 W, calculate the current in the primary coil of the circuit.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 11.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Can magnetic field set a resting electron into motion?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 12.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You are given two nuclei\u00a0<sub>3<\/sub>X7 and\u00a0<sub>3<\/sub>Y4. Are they isotopes of same element? State the reason . Which one of the two nuclei is likely to be more stable.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 13.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A heater coil is rated 100 W , 200 V. It is cut into two identical parts. Both parts are connected together in parallel , to the same source of 200 V. Calculate the energy liberated per second in new combination.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 14.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A charge q moving in a straight line is accelerated by potential difference V. It enters uniform magnetic field B perpendicular to its path . Deduce in terms of V an expression for the radius of circular path in which it travels.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 15.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">State the reason for the following observations recorded from the surface of the moon:  ( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(i) sky appears dark<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(ii) rainbow is never formed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 16.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Write any three characteristics , a ferromagnetic substance should posses , if it is to be used to make a permanent magnet. Give one example of such material.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 17.<\/strong>\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The value of ground state of hydrogen atom is -13.6 eV.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(i) What does the negative sign signify.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(ii) how much energy is required to take an electron in this atom from ground state to the first exited state.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0( 2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hope you like these questions. Download is also available below<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post contains conceptual questions for class 12 board exams although anyone can solve them if interested.<br \/>\nTry to solve these questions on your own in my net post I&#8217;ll publish 3 marks and 5 marks sample questions.<\/p>\n<p>Question 1. W cm apart on a hat is the amount of work done in moving 100 nC charge between two points 5 cm apart on an equipotential surface?           <\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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