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CBSE Class X Sample Question Paper 2017 : SCIENCE (with Marking Scheme / Solutions)

12 pages, 58 questions, 8 questions with responses, 8 total responses,

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

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Sample Question Paper 2016 17 Science Class X (SA II) Time allowed: 03 Hours Maximum Marks: 90 General Instructions: (i) (ii) (iii) (iv) (v) The question paper comprises two sections, A and B. You are to attempt both the sections. All questions are compulsory. There is no choice in any of the question. All questions of Section-A and B are to be attempted separately. Question numbers 1 to 3 in Section-A are one mark question. They are to be answered in one word or in one sentence. (vi) Question numbers 4 to 6 in Section- A are two marks questions. These are to be answered in 30 words each. (vii) Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in about 50 words each. (viii) Question numbers 19 to 24 in Section-A are 5 marks questions. These are to be answered in 70 words each. (ix) Question numbers 25 to 33 in Section- B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. (x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief. Section A 1 Name the process of converting vegetable oil to vegetable ghee. 1 2 List two secondary sexual characters of males that are different from that of females. Write the main function of Ozone in the upper atmosphere 1 When a concave mirror is placed facing the Sun, the Sun s rays converge to a point 10 cm from the mirror. Now, if you place a 2 cm long candles flame 20 cm away on the principal axis of the mirror, where would you place a screen to obtain the image of the candle? What would see the size of the image? Draw a ray diagram to justify your answer. If you find coliform bacteria in a sample of water collected from a river, what would you conclude? Give reason for such kind of water pollution. Which natural resources are called the biodiversity hot spots ? How these hot spots maintain ecological balance? What are isomers? Isomers of the first three members of alkane series are not possible . Give reason to justify this statement and draw structures of two isomers of butane, C4 H10. An organic compound X is a liquid at room temperature. It is also a very good solvent and has the molecular formula C2 H6 O. on oxidation X gives Y which give, break effervescence on reacting with NaHCO3. X reacts with Y in the presence of conc.H2SO4to give another compound Z which has a pleasant smell. Identify X, Y 2 3 4 5 6 7 8 1 2 2 3 3

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