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CBSE Class 12 Pre Board 2021 : Physics (Kendriya Vidyalaya (KV), Lucknow Region)

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KENDRIYA VIDYALAYA SANGATHAN, LUCKNOW REGION SECOND PRE BOARD EXAMINATION : 2020-21 SUBJECT: PHYSICS CLASS: XII QUESTION PAPER Maximum Marks: 70 Marks Time Allowed: 3 hours General Instructions: (1) All questions are compulsory. There are 33 questions in all. (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. (3) Section A contains ten very short answer questions and four assertion reasoning MCQs of 1 mark each, Section B has two case based questions of 4 marks each, Section C contains nine short answer questions of 2 marks each, Section D contains five short answer questions of 3 marks each and Section E contains three long answer questions of 5 marks each. (4) There is no overall choice. However internal choice is provided. You have to attempt only one of the choices in such questions. Sr. no. 1 Questions Section-A A beam of alpha particle projected along + X axis, experiences a force due to a magnetic field along the + Y axis. What is the direction of the magnetic field? Marks 1 2 If , m and represent wavelength of X-Rays, microwaves & visible rays then arrange the waves in increasing order of wavelength. 1 OR Name the device used for the production of microwaves. 3 An alpha particle enters in a uniform magnetic field with constant velocity v at an acute angle with magnetic field. Draw its path. 1 4 A metallic piece gets hot when surrounded by a coil carrying high frequency alternating current. Why? 1 5 6 7 8 OR If alternating voltage produced by generator is given by V = 10 Sin 628 t and is applied across a 1000 ohm resistance, then what will be effective voltage? What is the value of angular momentum of electron in the third orbit of Bohr s model of hydrogen atom? The work function for a metal is 2 eV. When a photon of 5 eV falls on its surface, find the maximum KE of emitted electrons. Compare the nuclear densities of hydrogen and Helium nuclei. OR Which two particles are also produced during conversion of a proton into neutron? Name two important processes which occur during the formation of p-n 1 1 1 1 Page 1 of 7

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