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CBSE Class 10 Sample / Model Paper 2021 : Science (with Marking Scheme / Solutions)

23 pages, 58 questions, 9 questions with responses, 9 total responses,

CBSE 10
Kendriya Vidyalaya (KV), Kamla Nehru Nagar, Ghaziabad

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Sample Question Paper 2020-21 Class X Science (086) Theory Time: 3 Hours Maximum Marks: 80 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 No. Questions Marks 1 List any two observations when Ferrous Sulphate is heated in a dry test tube? OR Identify the products formed when 1 mL of dil. Hydrochloric acid is added to 1g of Sodium metal? 1 2 Write the chemical name and chemical formula of the salt used to remove permanent hardness of water. 1 3 Which of the following is not observed in a homologous series? Give reason for your choice. a) Change in chemical properties b) Difference in -CH2 and 14u molecular mass c) Gradation in physical properties d) Same functional group 1 4 Why does the Sun appear white at noon? 1 1

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