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CLARENCE HIGH SCHOOL, BANGALORE 560005 MODEL EXAMINATION, JANUARY -2018 PHYSICS-1(THEORY) STD: Xll M.M :70 DATE: 05-01 -2018 TIME: 3hrs 1Smin You will not be allowed to write during the first 15 minutes This time is to be spent in reading the question paper. All questions are compulsory. This question paper is divided in 4 sections A, B, C and D as follows. Section A Question 1 is of twelve marks. All parts of thrs question are compulsory. Section B Question numbers 2 ta 12 carry 2 marks each with two questions having internal choice. Section C Question numbers 13 to 19 carry 3 marks each with two questions having internal choice. Section D Question numbers 20 to 22 are long- answer type questions and carry 5 marks each. Each question has an internal choice The intended marks for questions or parts of questions are given in bracket [ ]. Answers to sub parts of the same question must be given in one place only. A list of useful physicai constants is given at the end of this paper Section A Answer all questions. Question 1 A. Choose the correct alternative (a), (b), (c) or (d) for each of the following [5X1=5] In a rnetre bridge experiment the ratio of left gap resrstance to right gap resistance is 2 3. The balance point from left is (a) 20cm (b) 40cm (c) 50cm (d) 60cm lf the current (l) flowing through a orcular corl its radius (R) and number of turns (N1 in tt are each doubled magnetic flux density at its centre becomes. (a) Two trmes (b) Four times (c) Eighteen times (d) Sixteen trmes questions given (i) (ir) below:
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