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CBSE Class 9 Board Exam 2024 : Science

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ST. FRANCIS XAVIER SCHOOL Academic year 2022-2023 Class - XII Pre- Board Examination PHYSICS PAPER 1 (THEORY) (Set 02) Maximum Marks: 70 Time allowed: 3 hr. This paper is divided into four sections A, B, C and D. Answer all questions. Section A consists of one question having sub-parts of one mark each. Section B consists of seven questions of two marks each. Section C consists of nine questions of three marks each, and Section D consists of three questions of five marks each. Internal choices have been provided in two questions each in Section B, Section C and Section D. The intended marks for questions are given in brackets [ ]. All working, including rough work, should be done on the same sheet as and adjacent to the rest of the answer. Answers to sub parts of the same question must be given in one place only. A list of useful physical constants is given at the end of this paper. A simple scientific calculator without a programmable memory may be used for calculations. SECTION A 14 MARKS Question 1 (A) In questions (i) to (vii) below, choose the correct alternative (a), (b), (c) or (d) for each of the questions given below: [7 1=7] (i) For an electric dipole of charges q and -q separates by 2l0 find the work done in moving a charge q through l alone the perpendicular bisector of the dipole a. b. 1 . 2 . 4 0 0 1 4 0 . 0 . c. d. (ii) 4 0 . 2 . For a body centred cubic lattice of side a if the charge at the centre of the cube is q then the electric flux through each surface of the cube is: a. 0 b. 4 c. d. (iii) 1 0 6 0 6 0 2 For a monochromatic ray that passes through an isosceles triangle with minimum deviation must have: a. Angle of incidence equals to angle of prism. b. Each angle of refraction inside the prism is not half the angle of prism. c. Angle of emergence equals to angle of prism. d. Each angle of incidence and emergence equals to (prism angle +minimum deviation angle). Page 1 / 6

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