SAMPLE QUESTION PAPER SUMMATIVE ASSESSMENT II, 2013 – 14. CLASS
X – SCIENCE [SET-I]. TIME: 3 hours. Max. Marks: 90. General Instructions:-.
SAMPLE QUESTION PAPER SUMMATIVE ASSESSMENT II, 2013 – 14 CLASS X – SCIENCE [SET-I] TIME: 3 hours
Max. Marks: 90
General Instructions:I. The question paper comprises of two sections A and B. You are to attempt both the sections II. All questions are compulsory. III. There is no overall choice. However internal choice has been provided for one question of five mark category. Only one option to be attempted IV. All questions of Section A and 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 one sentence. VI. Question numbers 4 to 7 are two marks questions to be answered in about 30 words each. VII. Question numbers 8 to 19 are three marks questions to be answered in about 50 words each. VIII. Question numbers 20 to 24 are five marks questions to be answered in about 70 words each. IX. Question numbers 25 to 42 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.
SECTION A 1) Among the following which one have a triple covalent bond ? C2H6 , C3H 4 , C4H10
(1)
2) Mention the easiest method to detect water pollution?
(1)
3) Name any two oxidizing agents for alcohols?
(1)
4) An object 2cm in size is placed 30cm in front of a concave mirror of focal length 15cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? (2) 5) (a) What is meant by power of accommodation of eye? (b) How does focal length of the eye lens change when we shift looking from distant object to nearby object? (2) 6) Distinguish between food chain and food web?
(2)
7) Why do we seek construction of dams? Mention any two problems faced with the construction of large dams? (2) 8) Write the structural formula of the following and state whether these are isomers with reason? (a) 1 – butyne (b) 2 – butyne
(3)
9) (a) Why ethene decolourises bromine water, but ethane not. (b) Write down the relevant chemical equation involved in decolourisation? (3) 10) Based on the behaviour towards light how substances can be classified? Give one example of each? (3) 11) Describe three methods of plant propagation which are commonly used for growing garden plants? (3) 12) Draw a neat labeled diagram of longitudinal section of a typical flower? (3) 13) (a) Write the electronic configurations of the following elements? Oxygen, Magnesium (b) Among O2- ion and Mg2+ ion, which one have larger size and why? (3) 14) Mention any three purposes of using lens combinations in optical instruments? (3) 15) What are the consequences of ozone layer depletion? (Any three)
(3)
16) What is meant by dispersion of white light? Draw a ray diagram to show dispersion of white light by a glass prism? Why do we get different colours? (3) 17) Energy flow in the biosphere is unidirectional. Comment on the statement (3) 18) Atomic numbers of the three elements A, B and C are given below. Element Atomic number
A (5), B (7), C (10) Identify the group and period in which these elements belong? 19) Why should we conserve forest and wild life? (Any three points)
(3) (3)
20) By drawing ray diagrams, show the formation of image, when an object is placed on the principal axis of a concave mirror at the following positions and write about the nature of the image in each case. (a) At infinity (b) Beyond the centre of curvature (c) At the centre of curvature (d) At the principal focus (e) Between the pole and focus (5) 21) Human resources in India are depleting with increasing number of people getting infected by AIDS virus and it has become a socio economic hazard. (a) Name the virus which causes AIDS? (b) Mention the modes of transmission of AIDS virus (c) What is the effect of AIDS virus on human body? (d) Give any two measures to prevent the transmission of aids virus
(5)
22) An organic compound A is widely used as a preservative in pickles and has a molecular formula C2H 4O2. This compound react with ethanol to form a sweet smelling compound B. (a) Identify the compound A (b) Write the chemical equation for its reaction with ethanol (c) Name the products formed (d) Name the process involved in the reaction (e) How can we get back the compound A from B (5) OR (a) Complete the following equations i) nCH 2=CH2 + H2 ................. ii) CH3-COOH + NaHCO 3 .......... + .......... + .......... (b) What is the cause of hardness of water? Why soap do not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water? (5) 23) (a) Distinguish between homologous and analogous organs with one example each (b) Define F1, F2 generations (c) Define the term variations
(5)
24) Give reasons for the following (a) Colour of clear sky is blue (b) Sun can be seen about two minutes before actual sunrise (c) Traffic light signals are of red colour (d) Stars appears to twinkle (e) Planets do not twinkle (5) SECTION B
25. On adding NaHCO3 to acetic acid, one immediately a) observes strong effervescence b) hears a hissing sound c) gets pungent smell d) observes the evolution of a coloured gas
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26. In an experiment to trace the path of a ray of light passing through a rectangular glass slab four students tabulated ∟i, ∟r and ∟e as given below. The student who has performed the experiment most carefully is 1 Student ∟i ∟r ∟e
A 0
30 170 280
B 0
30 240 300
C 0
30 210 320
D 0
30 190 300
a) A b) B c) C d) D 27. A student is to find the focal length of (i) a concave mirror (ii) a convex lens by focusing the image of a distant object on a screen. He will observe that on the same side as that of the object in 1 a) Both cases b) Case (i) but not in case (ii) c) Case (ii) but not in case (i) d) Neither case (ii) nor in case (i) 28. On the basis of experiments performed by students with rectangular glass slabs the correct interpretation about the incident ray, refracted ray and emergent ray would be 1 a) ∟i > ∟e b) ∟e < ∟r c) Emergent ray is parallel to the refracted ray. d) Incident ray and emergent ray are parallel to each other. 29. While observing, a student will find that shape of amoeba is 1 a) Round b) Oval c) Irregular d) Rod like 30. In budding 1 a) Cell divides transversely. b) Cell divide longitudinally c) Nucleus divides followed by the development of protuberance. d) A small protuberance develops followed by nuclear division. 31. Which of the following gives vinegar like smell? 1 a) Acetic acid b) Ethanol c) Sodium bicarbonate d) Sodium carbonate 32. Using a convex lens a student obtained a sharp image of the grill of a window in the laboratory on a screen. For getting better result she focused a distant tree instead of the grill. For getting a sharp image on the screen, in which direction should the lens be moved? 1
a) Away from the screen. b) Towards the screen. c) Behind the screen. d) Very far away from the screen. 33. Which colour is deviated least when dispersion takes place through a prism? 1 a) Violet b) Red c) Blue d) Yellow 34. Where an object should be placed in front of a convex lens to get a real image of the size of the object? 1 a) At f b) At infinity c) At 2f d) Between O and f 35. A basket of vegetables contain carrot, potato, radish and tomato. Which of them represent the correct homologous structures? 1 a) Carrot and potato b) Carrot and tomato c) Radish and carrot d) Radish and potato 36. Which of the following pairs of organs is analogous to each other? a) Leaf spines and leaf tendrils b) Flipper of a whale and leg of a horse c) Forelimbs of frog and human hand d) Wings of an insect and wings of a bat
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37. Which of the following part is not found in a gram seed? 1 a) Cotyledons b) Endosperm c) Radicle d) Plumule 38. In which of the following water sample soap will show maximum cleaning capacity? 1 a) Distilled water b) Well water c) Distilled water in which Calcium sulphate is dissolved d) Distilled water in which Calcium bicarbonate is dissolved 39. While studying the binary fission in amoeba, an observer finds that at the end of this process 1 a) A parent cell and a daughter cell are produced. b) Identity of the parent cell is lost. c) Two daughter nuclei are formed. d) Division of cytoplasm starts.
40. To determine the focal length of a convex lens by obtaining a sharp image of a distant object, the following steps is suggested which are not in proper sequence. 1 1. Hold the lens between the object and the screen. 2. Adjust the position of the lens to form a sharp image. 3. Select a suitable distant object. 4. Measure the distance between the lens and the screen. The correct sequence of steps to determine the focal length of lens is. a) 1, 2, 3, 4 b) 3, 1, 4, 2 c) 3, 4, 2, 1 d) 3, 1, 2, 4 41. In an experiment on tracing the path of a ray of light through a rectangular glass slab, four students A, B, C, D used the following values of angle of incidence and the distance between feet of the two pins (fixed on the incident ray). 1 o o o A) (30 , 45 , 60 ) and 1cm B) (30o, 45o, 60o) and 6cm C) (20o, 50o, 80o) and 10cm D) (20 o, 50o, 80o) and 15cm Out of these the best choice is that of student, a) A b) B c) C d) D 42. Which of the following sodium compound is heated with castor oil in the making of soap? 1 a) Na2CO3 b) NaHCO 3 c) NaOH d) CH3COONa
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