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Class 10 CBSE Pre Board 2015 : Science 1 (Kendriya Vidyalaya (KV) No. 2, Raipur)

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KENDRIYA VIDYALAYA SANGATHAN; RAIPUR REGION SUMMATIVE ASSESSMENT -II (2014 - 15) CLASS X SCIENCE TIME 3 Hrs MM 90 General instructions: i)The question paper comprises of two sections ,A and B.You are to attempt both sections. ii)All questions are compulsory. iii) There is no overall choice . iv)Aii questions of section A and all questions of section B are to be attempted separately. v)Question numbers 1 to 3 in section A are one mark questions.Theseare to be answered in one word or one sentence. vi)Question numbers 4 to 6 are two mark questions, to be answered in about 30 words each. vii)Question numbers7 to 18 are three mark questions, to be answered in about 50 words each. viii)Question numbers 19 to 24 are five mark questions,to be answered in about 70 words each. Ix)Question number 25 to 33 of B section are multiple choice questions based on practical skills. Each questions is a one mark question.You are to select one most appropriate response out of the four provided to you. x) Question number 34 to36 of section B are two mark questions based on practical skills. SECTION A Q1.State two characteristic features of carbon which when put together give rise to large number of carbon compounds. Q2.List two functions performed by ovaries in a human female. Q3.Define principal focus of a concave mirror. Q4.What is biodegradable waste? If all the waste we generate is biodegradable, what impact may this have on the environment? Q5.An object is placed at a distance of 10 cm from a concave mirror. If its image is observed at 6cm from the mirror, calculate the focal length of the mirror. Q6.Name those parts of the flower which serve the same function as the following do in animals: (i) Testis (ii) Ovary (iii) eggs (iv) sperm. Q7.How do the following traits change in a period from left to right in the periodic table:a)Atomic size. (b) Valency (c) metallic character. Q8.What are isomers? Write two possible isomers of butane. Q9.If we cross pure bred tall(dominant) pea plant with pure bred dwarf(recessive) pea plant we will get pea plants of F1generation.If we now self cross the pea plant of F1 generation, then we obtain pea plants of F2 generation. a) What do the plants of F1generation look like? b) State the ratio of tall plants to dwarf plants in F2 generation. c)State the type of plants not found in F1 generation but appeared in F2 generation mentioning the reason for the same. Q10.A student cannot see a chart hanging on a wall placed at a distance of 3 m from him .Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision (ii)for its correction. Q11.Namita is a doctor in a village .She finds abnormalities in the general health and reproductive health of women who are mostly illiterate. The reason being frequent pregnancies. She suggested some methods of contraception. List and explain in brief three methods of contraception suggested by the doctor. Q12.A group of grasshoppers some green and some brown lived in grassland having dry bushes and dry grass. a)Which one would be normally picked up by predatory birds and why? b) Population of which grass hopper will increase? c) Name this phenomenon. Q13. With the help of a ray diagram, state what is meant by refraction of light. State Snell s law for refraction of light and also express it mathematically. Q14.Give difference between a food chain and a food web. What would happen if all the organisms of one trophic level are removed completely? What would be its effect on the ecosystem? Q15. a) Distinguish between producers and decomposers. b) Classify the following as producers and decomposers: Green plants, Bacteria, Fungi, Bluegreen algae. Q16.Draw a diagram showing fertilisation in flowering plants and label on it the following: (i)Pollen tube (ii) ovary (iii) female germ cell (iv) male germ cell. Q17.What is dispersion of white light? State its cause. How will you use two identical glass prisms to obtain white light. Q18.Give reason for the following : (i) (ii) (iii) A normal eye is not able to see clearly the objects placed closer than 25 cm. The sun appears reddish at sunrise. The sky appears dark to an astronaut. Q19.Atomic number of a few elements are given below .(any two) 10, 20, 7, 14. (a) (b) (c) (d) (e) Identify the elements. Identify the group number of these elements in the Periodic Table. Identify the Periods of these elements in the Periodic Table. What would be the electronic configuration for each of these elements? Determine the valency of these elements. Q20.Name the type of mirror that could be used to obtain i) ii) Magnified and real image of an object. A diminished and virtual image of an object. Draw labelled diagrams to show the formation of the required image in each of the above two cases. Which of these mirrors could also form a magnified and virtual image of the object? Show with help of diagram the position of the object for which this could happen. Q21. Draw a well labelled diagram of human eye and mention the functions of the following parts: i) Pupil (ii) Ciliary muscles (iii) Eye lens. Q22. An organic acid A is a liquid which often freezes during winter time in cold countries, has the formula C2 H4 O2. On warming with ethanol in presence of few drops of concentrated sulphuric acid a compound B with a sweet smell is formed. i)Identify A and B. ii) Write a chemical equation for the reaction involved. Q23 Give two examples each of acquired and inherited traits Explain why acquired traits are not inherited. Q24a) Give reasons : i)Blocking of Fallopian tubes prevents pregnancy. ii)Testes are located outside abdominal cavity. iii) Copying of DNA is important in the process of reproduction b) With the help of suitable diagrams explain how reproduction occurs in hydra. Also name the process. SECTION B Q25.On refraction through a glass slab, the correct emergent ray is C A B a) A (b) B (c) C (d) all of these. Q26.A student was asked to obtain real image of a tree on the screen with the help of a suitable mirror.He can do so by taking a: (a) Concave mirror (b) plane mirror (c) convex mirror (d) all of these. Q 27.In which test tube a student would observe effervescence on pouring acetic acid as shown in the following diagram. (a) I (b) II (c) III ( d) IV Q28) Which of the following when present in water will make it hard ? a) NaCl (b) CaCl2 (c) CaCO3 (d) All. Q29. A student prepared 20% sodium hydroxide solution in a beaker. The observations noted by him are given below : i. ii. iii. iv. Sodium hydroxide is in the form of pellets. It dissolved in water readily. The beaker appears cold from outside when touched. The red litmus paper turns blue when dipped into the solution. The correct observations are: a) I, II and III b) II, III and IV c) III, IV and I d) I,II and IV Q30. All of the following properties of acetic acid are true except: a) b) c) d) It is colourless. It is odourless. It is miscible in water. It turns blue litmus red. Q31. Analogous organs have: a) Similar function (b) similar origin (c) similar form (d) similar ancestor. Q 32. The process represented in diagram below is: a) Formation of spores in Amoeba. b) Formation of bud taking place in Amoeba. c) Identical gametes being formed in Amoeba. d) Formation of daughter cells in Amoeba. Q33.Food is stored in dicot seeds in a)Plumule (b) Radicle (c) Cotyledons (d) embryo. Q34.Why there is no dispersion of light on passing through a rectangular glass slab as in glass prism? Show diagrammatically. Q35. Why common salt is used to precipitate out the soap from the reaction mixture? Q36.Why are binary fission and budding included under asexual reproduction? -----------------------------------------------x-------------------------------------------------------------------------------- MARKING SCHEME 10 SCIENCE SA2 QNO. Q.1 Q2. Q3 Q4 Q5 Q6 Q7 Q8. Q9. Q10. Q11. Q12. Q13. Q14. Q15 Q16 SESSION 2014-15 VALUE POINTS Catenation tetravalency Producing female germ cells. Producing female hormones Correct definition Foul smell causing air pollution Breeding ground for mosquitoes and flies leading to cause and spread of diseases Correct steps andWorking Correct answerand unit(ans-3.75cm) Stamen,carpel,ova,pollen grains Atomic size- decreases Valency-first increases then decreases Metallic character-decreases.(with reasons in brief) Definition of isomers Two isomers n-butane ,iso-butane with structural formulae All tall 3:1 Dwarf pea plants (reason included) myopia or near- sightedness Using concave lenses Correct ray diagrams for both cause and correction. Any three methods of contraception,to be listed and explained. Green ,easily spotted in dry bushes Brown Natural selection Diagram and definition Snell s law Mathematical expression Difference Correct answer regarding effect on trophic levels. Correct answer regarding effect on environment. Difference Correct classification Correct diagram Correct labelling Q17. Definition of dispersion Cause Answer with diagram Q18. Correct reason for each separately. Q19. Any two elements from the four elements given. Q20 Concave mirror Convex mirror Diagrams Concave mirror ,position of object MM90 MARKS ALLOTMENT marks each=01 mark marks each=01 mark 01 mark 1+1=2 marks 1+1=2 each=2marks 1 mark each =3 marks 1+1+1 =3 marks 1+1+1 =3marks + 1/2 +1+1 =3 marks 1+1+1 =3 marks 1+1+1 =3 marks 1+1+1 =3marks 1+1+1 =3 1+2 =3 1+1/2+1/2+1/2+1/2 =3 marks 1+1+1 =3marks 1+1+1=3marks +1/2=1 for each bit.=05 marks 1+1+1+1+1 =5 marks Q21. Diagram of human eye. Correct labelling Functions. Q22. Q23. Q24. Q25. Q26. Q27. Q28. Q29. Q30. Q31. Q32. Q33. 1 +1 +3 =5 A is acetic acid also called ethanoic acid and 1 glacial acetic acid. +1 B is an ester +3 Correct chemical equation. =5 marks Two examples each of acquired and inherited 2+2+1 traits. Reason. Correct reasons for all three. 1+1+1 Diagrams 1+1/2 Process -budding +1/2 =5 Section B ( MCQ) b) B 1mark a) Concave mirror 1mark d) IV 1 mark b) CaCl2 1 mark d)I,II and IV 1mark b)odourless 1mark a) Similar function 1mark d)formation of daughter cells in Amoeba 1mark c) cotyledon 1mark Q34. Re combination of light and diagram Q35. Correct reasons Q36. Correct reasons 1+1 2 marks 2 marks

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