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

5 pages, 38 questions, 21 questions with responses, 31 total responses,    0    0
 Kendriya Vidyalaya No.1 Salt Lake Kendriya Vidyalaya (KV) No. 1, Salt Lake
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KENDRIYA VIDYALAYA SANGATHAN-KOLKATA REGION 3rd PRE-BOARD EXAMINATION: 2014-15 SUB: PHYSICS TIME ALLOWED: 3 HOURS M.M : 70 Please check that this question paper contains 26 questions. Please write down the Serial Number of the question before attempting it. 15 minutes time has been allotted to read this question paper. General Instructions: (i) (ii) (iii) (iv) (v) (vi) All questions are compulsory. There are 26 questions in total. Questions 1 to 5 carry one mark each, questions 6 to 10 carry two marks each, questions 11 to 22 carry three marks each and questions 24 to 26 carry five marks each. Question number 23 is a value based question and carries 4 marks. 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 given choices in such questions. Use of calculators is not permitted. However, you may use the log tables, if necessary. You may use the following values of physical constants wherever necessary : c = 3 X 10 8 m/s h = 6.63 X 10 -34 Js e = 1.6 X 10 -19 C 0 X -7 0 = 8.85 x 10-12 N m2 C-1 T m A-1 0 = 9 X 109 N m2 C-2 Mass of electron me = 9.1 X 10-31 Kg Mass of proton mp = 1.67 X 10-27 Kg Mass of neutron mn = 1.675 X 10-27 Kg Q1. Can electrostatic potential at a point, be zero, while electric field at that point is not zero? Justify your answer. Q2. A conductor of length L is connected to a d.c. source of potential V. If the length of the conductor is tripled by gradually stretching it, keeping V constant, how will drift speed of electrons be affected? Q3. No force is exerted by a stationary charge when placed in a magnetic field. Why? (1) Q4. A concave mirror is held in water. What should be the change in focal length of the mirror? (1) Q5. An alpha particle and a proton are accelerated from rest through the same potential difference V. Find the ratio of de- Broglie wavelength associated with them. (1) Q6. A network of six identical capacitors, each of capacitance c is made in figure. Find the equivalent capacitance between the pointsA and B as shown in figure. A B (2)

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Additional Info : KV Sangathan, Kolkata Region PHYSICS Pre-Board
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