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CBSE XII Sample / Mock 2017 : PHYSICS (with Marking Scheme / Solutions)

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Sample Paper(2016-17) Time allowed: 3 hours PHYSICS (XII) Maximum Marks: 70 General Instructions: (i) (ii) All questions are compulsory. There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and one question of five marks. You have to attempt only one of the choices in such questions. This paper has five distinct sections. (iii) Section A has Question numbers 1 to 5. They are very short answer type questions, carrying one mark each. (iv) Section B has Question numbers 6 to 10. They are short answer type questions, carrying two marks each. (v) Section C has Question numbers 11 to 22. They are also short answer type questions, carrying three marks each. (vi) Section D has Question number 23. It is a value based question, carrying four marks. (vii) Question numbers 24 to 26 are long answer type questions, carrying five marks each. (viii) Use of calculators is not permitted. However, you may use log tables, if necessary. (ix) You may use the following values of physical constants wherever necessary: c = 3 108 ms-1 h = 6.6 10-34 Js e = 1.6 10-19 C 0 = 4 10-7 T m A-1 Mass of neutron mn = 1.675 10-27kg Mass of proton mp = 1.672 10-27kg Boltzmann's constant k = 1.38 10-23 J K-1 Avogadro's number NA = 6.023 1023 / mole 1 MeV = 1.602 10-13 J ---------------------------------------------------------------------------------------------SECTION A 1. Represent graphically the variation of electric field with distance, for a uniformly charged plane sheet. (1) 2. Draw a graph to show a variation of resistance of a metal wire as a function of its diameter keeping its length and material constant. (1) 3. A rod of length L, along East-West direction is dropped from a height H. If B be the magnetic field due to earth at that place and angle of dip is , then what is the magnitude of induced emf across two ends of the rod when the rod reaches the earth? (1)

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