SUMMATIVE ASSESSMENT II, 2012 II, Class X /

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1 SUMMATIVE ASSESSMENT II, 2012 II, 2012 SCIENCE / Class X / X Time allowed : 3 hours Maximum Marks : 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 in all the five questions of five marks category. Only one option in such questions is to be attempted. (iv) All questions of Section-A and all questions of Section-B are to be attempted separately. (v) Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in one word or in one sentence. (vi) Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered in about 30 words each. (vii) Question numbers 14 to 22 in Section-A are three marks questions. These are to be answered in about 50 words each. (viii) Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered in about 70 words each. (ix) Question numbers 26 to 41 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. (i) (ii) (iii) (iv) (v) 1 4 (vi) (vii) (viii) (ix) Page 2 of 13

2 SECTION-A / 1. Write the two succeeding members of the following homologous series : C 2H 6, C 3H 8. C 2 H 6, C 3 H 8 2. State the colour of sunlight scattered by air molecules in the atmosphere. 3. Write any two effects of Ozone depletion on our health. 4. Write the appropriate names of the trophic levels Z and X in the figure given below : Z X 5. State modern periodic table law. What is the number of total periods and groups in periodic table. Page 3 of 13

3 आध ननक आवर त स यण क ननमभ नरख म आवतर स यण भ क र ककर न आवर त र थ ककर न सभ ह ह 6. How does the atomic radii of elements change in periodic table : down the group across the period from left to right आवर त स यण भ र त वव क ऩयभ खववक त र ज म ककस प रक य ऩरयवनर तर ह र ह : ककस वर त (ग र ऩ) भ न च क ओय ककस आवर त (ऩ रयमड) भ फ ए स द ए 7. Explain with example the importance of variation in the species. 8. How is the process of binary fission in Amoeba different to that in Leishmania? 9. List four characteristics of images formed by plane mirrors. 10. What is dispersion? What happens when light is passed through a glass prism. 11. What is meant by near point and far point of an eye? State their values for the normal human eye. 12. Why must we conserve our forests? List any two causes for deforestation to take place. 13. Define water harvesting. List two traditional systems of water harvesting. 14. Explain why it is difficult to wash clothes with soap when water is hard. How do detergents help in overcoming this problem? 15. Part of the periodic table is given below where atomic numbers of elements are given in the parenthesis. Li (3) Be (4) Na (11) Mg (12) K (19) Ca (20) Rb (37) Sr (38) (i) Give the electronic configuration of K. Page 4 of 13

4 (ii) Predict the number of valance electrons in the atom of Ca. (iii) What is the number of shells in the atom of Na? (iv) Arrange Be, Mg, Ca, Sr in the increasing order of the size of their respective atoms. (v) Predict whether Rb is a metal or non metal. (vi) Out of Na, Li, Be and Mg which one has biggest atom in size? न च आऩक आवर त-स यण क एक ब र कदम र म ह खजसभ र त वव क ऩयभ ण -स ख म क ष ठक भ द र ई ह Li (3) Be (4) Na (11) Mg (12) K (19) Ca (20) Rb (37) Sr (38) (i) K क इर क ट र ननक त रवन म स नरख म (ii) Ca क ऩयभ ण भ ककर न स म जकर इर क ट र न ह र? (iii) Na क ऩयभ ण भ ककर न क श ह र? (iv) (v) Be, Mg, Ca, Sr क इनक ऩयभ ण ओ क स इज क क रभश: फढ़र क रभ न स य व मवखथथर क खजम Rb ध र ह अथव अध र? अन भ ननर क खजम (vi) Na, Li, Be औय Mg भ ककसक ऩयभ ण क स इज सफस फड़ ह र? 16. Draw a neat labelled diagram of a germinated seed and label radicle, plumule and cotyledon. Mention function of each of these parts. 17. Name the organism Mendel used for his experiment. Explain about F1 and F2 progeny obtained by Mendel when he cross-bred the tall and the short varieties of the organism he experimented with. F1 F2 18. What is meant by analogous organs and homologous organs? Identify the analogous and homologous organs amongst the following : Wings of a butterfly, wings of a bat, forelimbs of frog, forelimbs of a human. 19. How is sex of a new born determined genetically in human beings? Page 5 of 13

5 20. State the reason of using convex mirrors as rear-view mirrors. A convex mirror used on an automobile has a focal length of 3 m. If a car behind is at a distance of 5 m, find the location of image of the car in the mirror. 3 m 5 m 21. Define power of a lens and state its SI unit. Which type of lens has a negative power? Find the power of a lens of focal length 20 cm. SI 20 cm 22. A person cannot see nearby objects clearly. State the defect of vision he is suffering from. Draw ray diagrams to show the defect and correction. Name the lens used for correction (i) Explain the two characteristic features that are seen only in carbon and not in any other element, to form a large number of compounds. (ii) (i) Write the names of the next homologue of CH 3 CH 2 OH and HCOOH. (ii) CH 3 CH 2 OH HCOOH OR A compound X is used in cough syrups and many tonics. It is also soluble in water in all proportions.. (i) Name the compound X. Write its chemical formula. (ii) Which gas is evolved when the compound X reacts with sodium? How will you test the presence of this gas? Write the chemical equation involved in reaction of X with sodium. (iii) Complete the following equation for X and Identify Y. Alkaline kmno X 4 Y Heat X (i) (ii) X X X (iii) X Y Page 6 of 13

6 'X' KMnO 4 'Y' 24. Specify the location of human testis in male reproductive system and write the advantage of it being present over there. Mention two roles of testis in reproductory system. Write two glands found in male reproductive pathway and specify their roles. OR/ Draw a neat diagram of human female reproductive system and label (i) Oviduct (ii) Ovary (iii) Uterus (iv) Cervix Mention the function of Uterus and Oviduct. (i) (ii) (iii) (iv) 25. A concave lens of focal length 20 cm forms an image 10 cm away from the lens. Use lens formula to find the position of the object with respect to the lens. Also draw ray diagram to illustrate the image formed in this case. 20 cm 10 cm OR/ State the laws of refraction of light. Using the lens formula and sign conventions for refraction by spherical lenses find the position nature and magnification of the image formed by a convex lens of focal length 20 cm when object is placed at a distance of 18 cm from the lens. 18 cm 20 cm SECTION - B / 26. Four test tubes containing solutions (I), (II), (III) and (IV) are shown below along with their Page 7 of 13

7 colours. Zink sulphate is contained in : (I) (II) (III) (d) (IV) (I), (II), (III) (IV) (I) (II) (III) (d) (IV) 27. The correct observation made by the student after putting clean pieces of iron in the test tube containing Zinc Sulphate solution as shown in the diagram : (d) Solution becomes green and zinc metal gets deposited on iron pieces Solution becomes colourless and zinc metal gets deposited on the iron pieces No reaction is observed Iron pieces start dissolving in the solution making it pale green. (d) 28. Crystals of CH 3COOH, when dissolved in water, will form : Page 8 of 13

8 weak acid. weak base. strong acid. (d) strong base. CH 3COOH क कक रथटर क जर भ घ रन ऩय प र प त ह र : द फतर अम र द फतर य प रफर अम र (d) प रफर य 29. Neelima was asked to test the solubility of acetic acid. She added a small amount of its crystals into water taken in a beaker. After some time she observed that : White precipitate was formed at the bottom. Crystals dissolved completely. Crystals settled at the bottom. (d) gas was evolved with effervescence. न नरभ स एस कटक अम र क घ रनश रर क ऩय ण कयन क नरम कह र म उसन इसक क छ कक रथटर फ कय भ बय ऩ न भ ड र क छ सभम क फ द उसन द : र र भ सप द अव ऩ फन र म ह कक रथटर ऩ य र यह स घ र र म कक रथटर र र भ फ ठ र म (d) फ दफ द हट स एक र स ननकरर ह 30. During the experiment to study reaction of acetic acid with sodium bicarbonate, a student passed the evolved gas through lime water in a test tube. He would observe that : a yellow precipitate is formed. no change in colour of lime water takes place. lime water turns milky. (d) lime water turns pink. एस कटक अम र क स कडमभ फ इतक फ न ट क स थ अनबकक रम क प रम र कयन क नरम एक त रवद य थ न उत वऩन न र स क ऩय नर भ नरम च न क ऩ न स र ज य वह प र ख र कय र : एक ऩ र अव ऩ फन र म च न क ऩ न क य र भ क इत ऩरयवर तन नह आम च न क ऩ न द नधम ह र म (d) च न क ऩ न र र फ ह र म 31. The focal length of a concave mirror in the experimental set up shown below is equal to : Page 9 of 13

9 12.2 cm 11.4 cm 11.0 cm (d) 10.8 cm 12.2 cm 11.4 cm 11.0 cm (d) 10.8 cm 32. While determining focal length of a concave mirror, four students A,B,C,D obtain the image of a distant tree on a screen and make the following observation : (A) Image is virtual, erect and small (B) Image is real, erect, small (C) Image is real, inverted, small (D) Image is virtual, inverted, small Who has made the correct observation A B C (d) D A,B,C,D (A) (C) (B) (D) A B C (d) D 33. In the laboratory a student was provided with a convex lens whose focal length was somewhere between 20 cm to 25 cm. While focusing a distant object to find out its focal length, he should adjust the position of screen between : 20 cm and 25 cm marks on scale from lens 40 cm and 50 cm marks on scale from lens 25 cm and 30 cm marks on scale from lens (d) 15 cm and 20 cm marks on scale from lens 20 cm 25 cm 20 cm 25 cm Page 10 of 13

10 40 cm 50 cm 25 cm 30 cm (d) 15 cm 20 cm 34. While tracing the path of a ray of light through glass slab, a student observes that - refracted ray bends away from normal while emergent ray is parallel to incident ray. refracted ray is parallel to incident ray while emergent ray bends away from normal. refracted ray bends towards the normal while emergent ray is parallel to incident ray. (d) refracted ray bends towards the normal and emergent ray also bends towards the normal. (d) 35. While performing experiment with glass slab, a student observed that when a ray of light, on passing from one medium to another medium changes its path in the second medium. According to him this is called : reflection refraction scattering (d) Tyndal Effect (d) 36. Binary fission in amoeba begins with - Division of cell Division of cytoplasm formation of bud (d) fusion of two cells (d) 37. Binary fission in amoeba is shown below but these figures are not in right sequence. The correct sequence is - (i), (iii), (iv), (ii) (ii), (iii), (iv), (i) (iv), (iii), (ii), (i) (d) (iii), (iv), (ii), (i) Page 11 of 13

11 (i), (iii), (iv), (ii) (ii), (iii), (iv), (i) (iv), (iii), (ii), (i) (d) (iii), (iv), (ii), (i) 38. In the figure of budding in yeast given below, the structures A, B, C and D should be labelled respectively as : (d) Nucleus of bud, yeast, nucleus of yeast, bud Nucleus of bud, nucleus of yeast, bud, yeast Nucleus of bud, bud, yeast, nucleus of yeast Nucleus of bud, bud, nucleus of yeast, yeast A, B, C D, (d) 39. Study the following four figures that illustrate reproduction. The figures that illustrate budding are : I and II I and III I and IV (d) II and IV Page 12 of 13

12 I II I III I IV (d) II IV 40. A student noted down following observations : (i) mass of dry raisins 6.4 g (ii) mass of soaked raisins 8.0 g On the basis of these observation he would determine the percentage of water absorbed by raisins as : (d) 6.4 ककस छ न ननम ननरख र प र ण न ट ककए : (i) श ष क ककशनभश क द रव मभ न 6.4 g (ii) ब र ककशनभश क द रव मभ न 8.0 g इन प र ण क आध य ऩय वह ककशनभश द व य अवश त रषर जर क प रनर शर र ननध तरयर कय र (d) In order to remove extra water left on the surface of soaked raisins the raisins are wiped off gently using. dry cotton cloth dry cotton wool dry acrylic wool (d) filter paper ब र ककशनभश क ऩ ष ठ स अनर रयक त जर क हट न क नरए ककशनभश क ध य स ऩ छ ज र ह इसक नरए उऩम र ककम ज र ह - स स र कऩड़ स र ई स एक र नरक र ई (ऊन) (d) कपल टय ऩ Page 13 of 13