Download Previous Year Question Paper of CBSE Board Exam Science Class 10th Summative Assessment II 2016
Time allowed: 3 HoursMaximum marks: 70
General Instructions:
(i) The question paper comprises two Sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All 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. These 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 about 30 words each.
(vii) Question numbers 7 to 18 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 five-marks questions. These are to be answered in about 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.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All 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. These 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 about 30 words each.
(vii) Question numbers 7 to 18 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 five-marks questions. These are to be answered in about 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. Write the name and structure of an alcohol with three carbon atoms in its molecule. 1
14. How do Mendel's experiment show that traits are inherited independently ? 3
15. Two areas of study namely 'evolution and 'classification' arc interlinked". Justify this statement. 3
16. The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at a distance of 40 cm from the mirror, where is the object placed ? Where would the image be if the object is moved 20 cm towards the mirror ? State reason and also draw ray diagram for the new position of the object to justify your answer. 3
17. Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light. 3
18. The activities of man had adverse effects on all forms of living organisms in the biosphere. Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of himself but also of the entire living organisms on the mother earth. One of your classmates is an active member of 'Eco club' of your school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings.
(a) Why is it necessary to conserve our environment ?
(b) State the importance of green and blue dust-bins in the safe disposal of the household waste.
(c) List two values exhibited by your classmate who is an active member of Eco-club of your school. 5
19. A carbon compound 'P' on heating with excess conc. H2SO4. forms another carbon compound 'Q' which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound 'R'. One molecule of 'R' on combustion forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved. 5
20. What is placenta ? Describe its structure. State its functions in case of a pregnant human female.
2. What happens when a mature spirogyra filament attains considerable length ? 1
3. The depletion of ozone layer is a cause of concern. Why ? 1
4. Name the type of mirrors used in the design of solar furnaces. Explain how high temperature is achieved by this device. 2
5. "What was Chipko Andolan" ? How did this Andolan ultimately benefit the local people and the environment ? 2
6. "Burning of fossil fuels results in global warming". Give reasons to justify this statement. 2
7. Write chemical equation of the reaction of ethanoic acid with the following : (a) Sodium: (b) Sodium hydroxide: (c) Ethanol. Write the name of one main product of each reaction. 3
8. An aldehyde as well as a ketone can be represented by the same molecular formula, say C3H6O. Write their structures and name them. State the relation between the two in the language of science. 3
9. An element 'X' belongs to 3rd period and group 16 of the Modern Periodic Table. (a) Determine the number of valence electrons and the valency of 'X'. (b) Molecular formula of the compound when 'X' reacts with hydrogen and write its electron dot structure. (c) Name the element 'X' and state whether it is metallic or non-metallic. 3
10. An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number. period number and valency of T. 3
11. Define reproduction. How does it help in providing stability to the population of species ? 3
12. Explain the term 'Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra. 3
13. (a) List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
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(i) Name the part marked 'A' in the diagram.
(ii) How does 'A' reaches part ?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over ?
11. Define reproduction. How does it help in providing stability to the population of species ? 3
12. Explain the term 'Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra. 3
13. (a) List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
(i) Name the part marked 'A' in the diagram.
(ii) How does 'A' reaches part ?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over ?
14. How do Mendel's experiment show that traits are inherited independently ? 3
15. Two areas of study namely 'evolution and 'classification' arc interlinked". Justify this statement. 3
16. The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at a distance of 40 cm from the mirror, where is the object placed ? Where would the image be if the object is moved 20 cm towards the mirror ? State reason and also draw ray diagram for the new position of the object to justify your answer. 3
17. Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light. 3
18. The activities of man had adverse effects on all forms of living organisms in the biosphere. Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of himself but also of the entire living organisms on the mother earth. One of your classmates is an active member of 'Eco club' of your school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings.
(a) Why is it necessary to conserve our environment ?
(b) State the importance of green and blue dust-bins in the safe disposal of the household waste.
(c) List two values exhibited by your classmate who is an active member of Eco-club of your school. 5
19. A carbon compound 'P' on heating with excess conc. H2SO4. forms another carbon compound 'Q' which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound 'R'. One molecule of 'R' on combustion forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved. 5
20. What is placenta ? Describe its structure. State its functions in case of a pregnant human female.
21. Define evolution. How does it occur ? Describe how fossils provide us evidences in support of evolution. 5
22. It is desired to obtain an erect image of an object. using concave mirror of focal length of 12 cm
(i) What should be the range of distance of an object placed in front of the mirror ?
(ii) Will the image be smaller or larger than the object. Draw ray diagram to show the formation of image in this case.
(iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror ? Draw ray diagram for this situation also to justify your answer. Show the positions of pole. principal focus and the centre of curvature in the above ray diagrams.
23.
(i) What should be the range of distance of an object placed in front of the mirror ?
(ii) Will the image be smaller or larger than the object. Draw ray diagram to show the formation of image in this case.
(iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror ? Draw ray diagram for this situation also to justify your answer. Show the positions of pole. principal focus and the centre of curvature in the above ray diagrams.
23.
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