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CBSE XII Pre Boards 2015 : PHYSICS with Answers (KV Chennai)

10 pages, 42 questions, 19 questions with responses, 29 total responses,

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KENDRIYA VIDYALAYA SANGATHAN, CHENNAI REGION Class-XII Time allowed: 3 Hrs Common Pre-Board Examination-2014 - 15 Physics(Theory) Maximum Marks: 70 General Instructions : (i) (ii) (iii) (iv) (v) (vi) All questions are compulsory. There are 26 questions in total. Questions 1 to 5 are very short answer type questions and carry one mark each. Questions 6 to 10 carry two marks each, questions 11 to 22 carry three marks each, question 23 is value-based question carry four marks and questions 24 to 26 carry five marks each. There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each. You have to attempt only one of the choices in such questions Use of calculators is not permitted. However, you may use log tables if necessary. You may use the following values of physical constants wherever necessary. C = 3 X 108 m/s h =6.63 X 10-34 JS e = 1.6 X 10-19 C 0 X -7TmA-1 me= 9.01 X 10-31 Kg. 1. An electron and a proton, having equal momenta, enter a uniform magnetic field at right anglesto the field lines. What will be the ratio of their trajectories? (1) 2. If a wire is stretched to double its original length without loss of mass, how will the resistivity ofthe wire be influenced? (1) 3. If the potential difference across a capacitor is doubled, what happens to: (a) The charge on the capacitor and (b) The energy stored in the capacitors. (1) 4. Which of the following 120 V ac device costs more to operate: (a) One that draws an rms current of 10 A or (b) One that draws a Peak current of 12 A ? (1) 5. Calculate the threshold frequency of photon for photoelectric emission from a metal of workfunction 0.1 eV (1) 6. Give block diagram of basic units of all communication system. Explain briefly (2) 7. Define Self-inductance of a coil. Show that energy stored in an inductor of self inductance carrying current I is LI2 (2)

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