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APEX ACADEMY ICSE PRE-BOARD EXAMINATION 2023-24 PHYSICS Maximum Marks: 80 Time Allowed: Two hours Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time. __________________________________________________________________________________________________ Section A is compulsory. Attempt any four questions from Section B The intended marks for questions or parts of questions are given in brackets [ ] __________________________________________________________________________________________________ SECTION A (40 MARKS) (Attempt all questions from this Section) Question 1 [15] Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only) (i) The direction of clockwise moment is along the axis of rotation (a) inwards (b) outwards (c) either (a) or (b) (d) none of these (ii) A ray of light enters from medium A into medium B as shown. The refractive index of medium B relative to A will be: Medium B (a) greater than unity (b) less than unity (c) equal to unity (d) zero Medium A (iii) The radiation deviated the most in an electric field is : (a) alpha (b) beta (c) gamma (d) all (iv) How many joule of heat energy are required to raise the temperature of 500 g of copper from 26 to 126 ? Take c = 400 J kg-1 K-1. (a) 500 J (b) 5 kJ (c) 20 kJ (d) insufficient data (v) Which is more energetic? (a) alpha particle (b) beta particle (c) gamma rays (d) X-rays [1] [Turn over]
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