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Class 10 CBSE Pre Board 2019 : Physics (Alagar Public School, Thoothukudi)

5 pages, 58 questions, 24 questions with responses, 27 total responses,    2    0
Raja Durai
Alagar Public School, Thoothukudi
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ALAGAR PUBLIC SCHOOL ACADEMIC YEAR 2 0 1 8 - 2 0 1 9 PREBOARD I EXAMINATION CLASS : XII DATE : 30.11.18 PHYSICS MARKS: 70 General Instruction : TIME: 3HRS All questions are compulsory. There are 27 questions in all. Section A contains 5 questions of one mark each, Section B contains 7 questions of two marks each, Section C contains 12 questions of three marks each, Section D contains 3 questions of five marks each. There is no overall choice. However, an internal choice has been provided in 1 question of 2 marks, 1 question of 3 marks and all the 3 questions of 5 marks weightage. You have to attempt only one of the choices in such questions. SECTION A 1. Where on the surface of Earth is the vertical component of earth magnetic field zero? 2. A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the direction of the induced current in each coil. 3. Why soft iron is used in the fabrication of core of a transformer? 4. A radio can tune into any station in the 7.5MHz to 12MHz band. What is the corresponding wavelength band? 5. What is the Brewster angle for air to glass ( =1.5) transition? SECTION B 6. State the Ampere s circuital law. 7. Two identical loops, one of copper and the other of aluminium are rotated with the same speed, in s uniform magnetic field acting normal to the plane of the loops. State with reason, for which of the coils (i) induced emf (ii) induced current, will be more. 8. What do you mean displacement current ? Give its S.I. unit. (OR) Define the term wattless current . Class 12/PREBOARD 1 EXAM/2018-2019/PHYSICS Page 1

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