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CBSE Class 10 Pre Board 2021 : Science - Set 4 (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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MODEL EXAMINATION (2020- 21) Time: 3hrs Mark:80 SCIENCE (086) CLASS: X General Instructions: (i) The question paper comprises four sections A, B, C and D. There are 36 questions in the question paper. All questions are compulsory. (ii) Section A - question no. 1 to 20 - all questions and parts thereof are of one mark each. These questions contain multiple choice questions (MCQs), very short answer questions and assertion - reason type questions. Answers to these should be given in one word or one sentence. (iii) Section B - question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answers to these questions should in the range of 30 to 50 words. (iv) Section C - question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answers to these questions should in the range of 50 to 80 words. (v) Section D question no. - 34 to 36 are long answer type questions carrying 5 marks each. Answer to these questions should be in the range of 80 to 120 words. (vi) There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions. (vii) Wherever necessary, neat and properly labeled diagrams should be drawn. SECTION A 1. Name the brown-coloured gas evolved when lead nitrate crystals are heated in dry test tube. (1) OR What changes do you observe in the iron nails and the colour of copper sulphate solution, if iron nails are dipped in CuSO4 solution for 15 minutes? 2. Dry HCl gas does not change the colour of dry blue litmus paper why? (1) 3. The functional group present in propanal is (1) a) -OH b) -COOH c) -CO- d) -CHO 4. Write down four important characteristics of image formed by a plane mirror. (1) 5. Define 1 dioptre of power of a lens. (1) Page 1 of 10

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