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CBSE Class 10 Pre Board 2020 : Science (Kendriya Vidyalaya (KV), Lucknow Region)

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Kendriya Vidyalaya Sangathan,Lucknow Region Pre Board I Subject Science Class X Max Marks 80. TIME:3HRS Note.Question paper has 30 Questions .Internal choice is given . Section A carries 1mark questions,Section B carries 3 marks questions,section C carries 5 marks questions. Section A 1. What is the function of split rings in an electric motor? 2. Answer Questions 2a to 2c on the basis of understanding of the paragraph.(1X3=3) Sunita was learning to bake cakes.`She added according to the recipe and placed it in oven.When the cake was ready to her surprise,it was not soft and fluffy. 2a.What ingredient she missed to add while preparing the cake. 2b.Write chemical reaction to show how this ingredient makes the cake fluffy. 2c .What is the correct formula of this ingredient-NaHCO3, Na2CO3 ,Na2CO3.10H2O,NaOH 3.Give an Example of food chain existing in the grassland. 4.Name the hormone that regulates carbohydrate ,protein and fat metabolism in the body. Directions-In the following questions the assertion and reason have been put forward, read statements carefully and choose correct options. a. Both A and R are true and R is correct explanation of A b. Both A and R are true and R is not correct explanation of A c. A is true and R is false. d. A is false R is true. 5. A. Food cans are coated with tin and not with zinc. R Tin is less reactive and non toxic metal. 6. A. The article made silver metal becomes dark on exposure of air for long time. R Layer of oxide forms on it s surface due to oxidation. 7. name an element more reactive than hydrogen and less reactive than hydrogen. 8. What is translocation. 9. In stainless steel alloy , iron is mixed with a. Cu and Cr, b. Cr and Ni, c. Cr and Sn., d. Cu and Ni. 10.What are the two unique properties of carbon that leads to large no. of compounds? 11. Study the following points and write appropriate term for each.(1x4=4) a. Process that takes place in fallopian tube ______________. b. Dics like special tissue linking embryo to uterine wall of mother _____________. c. Process of first menstruation after attaining puerty___________. d. Surgical method of contraception in males________________. 12. An element X forms a chloride with formula XCl2. Which is solid and has high M.P . X is most likely to be in group _____________ 2,1,16,15 13. Give one use of Concave mirror and convex mirror OR Name the type of lens used in microscope. 14.Name the phenomenon involved in twinkling of stars. Section B 15. An element X has atomic number 13 . a. what is it s group number and period number. b. What is it s valency . c What would be the formula of it s oxide .

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