SUMMATIVE ASSESSMENT II,

Transcription

1 Roll No. Code: 65/2 Please Check that this question paper contains 7 printing pages. Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. Please Please write down the serial Number of the question before attempting it. SUMMATIVE ASSESSMENT II, SCIENCE / Class X Time allowed : 3 hours Maximum Marks : 90 General Instructions : (iii) (iv) (v) (vi) (vii) (viii) (ix) The question paper comprises of two Sections, A and B. You are to attempt both the sections. All questions are compulsory. 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. All questions of Section-A and all questions of Section-B are to be attempted separately. Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in one word or in one sentence. Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered in about 30 words each. Question numbers 14 to 22 in Section-A are three marks questions. These are to be answered in about 50 words each. Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered in about 70 words each. Question 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.

2 SECTION-A / 1. The structural formula of an ester is : Write the molecular formula of alcohol and acid from which it would have been formed. 2. A person is advised to wear spectacles with convex lenses. What type of defect of vision is he suffering from? 3. List any two artificial ecosystems. 4. In a food chain comprising, Tiger, Plants, and Goat, which will : transfer the maximum amount of energy? receive minimum amount of energy? 5. Give any two changes in the properties of I-group elements of modern periodic table as we move downwards along the group.. 6. Write reason for the following (Number in parenthesis is atomic number of the substance) Lithium (3) and Sodium (11) are considered as active metals. Fluorine (9) is more reactive than chlorine (17). (3) (11) (17) (9) 7. Name the process by which transfer of Pollengrains transfer from anther to stigma. Mention any one external agent which performs this process in some flowers. Page 3 of 14

3 Differentiate between its two types. Give one example for each. 8. Name the organ which helps in providing nutrition to embryo. Where is it located? What causes the delivery of child from mother s uterus. 9. A concave mirror produces four times magnified real image of an object at 10 cm in front of it. Find the position of image? Is it erect or inverted? 10 cm 10. What will be colour of the sky in the absence of atmosphere? Why the traffic light stop signals are of red colour? 11. What is meant by power of accommodation of the eye? How does the focal length of the eye lens change when we shift looking from a nearby object to a distant object? 12. What changes can you make in your habit to become more environment friendly? Mention any 2 important points. 13. Mention any two benefits of water harvesting. 14. What are hydrocarbons? Give a chemical test to distinguish between saturated and unsaturated hydrocarbons. Page 4 of 14

4 What happens when ethane is combusted in the presence of air? Write chemical equation for the reaction. 15. An element A on combining with O2 produces an oxide A2O which is basic in nature. How many electrons must be there in the outermost shell of the elements A? To which group of periodic table it belongs? Identify whether it is metal or non-metal? A O2) A2O A A A 16. Name any sexually transmitted disease which is caused by virus caused by bacteria What may be the possible reasons for adopting contraceptives for sex? Mention any two. 17. Define evolution. Why are traits acquired during the life time of an individual not inherited? State two reasons. ज व वक स क प रभ ष ल खए एक एकल ज व र अपन ज वन क ल म उप ज त ल ण अगल प ढ़ म व श न गत य नह ह त ह? क ई द क रण ल खए 18. What are fossils? State in brief two ways to decide how long the organisms were alive. ज व म य ह? स प म उन द व धय क उ ल ख क जए जनक र हम यह न त करत ह क क ई ज व कब ज वत रह ह ग 19. "The sex of a new born child depends on its father and not on its mother". Justify this statement with the help of a flow chart. कस नवज त शश क ल ग उसक पत पर नभ र करत ह म त पर नभ र नह करत व ह आर ख क सह यत स इस कथन क प क जए Page 5 of 14

5 20. i) The refractive index of rock salt is What is the meaning of this statement? Draw the ray diagram for light incident normally on the surface of glass slab. What is the value of the angle of incidence and angle of refraction, in this case Define S.I unit of power of a lens. You are provided with two convex lenses of focal length 25 cm and 50 cm respectively. Which lens will you use to obtain more convergent light. Justify your answer, with a ray diagram (for drawing diagram you may choose a scale to represent 5cm by 1cm). S.I 25 cm 50 cm 1cm 5cm 22. A child sitting in class room is not able to read clearly the writing on the blackboard. Name the defect of vision the child is suffering from. How can it be corrected? Draw ray diagrams for defective eye its correction. 23. Why do carbon atoms not form ionic bonds in its compounds? Complete and balance the following chemical reactions : Palladium CH 2 CH 2 H 2 CH 4 C l2 Sunlight (iii) Give a chemical test to distinguish between an alcohol and carboxylic acid. (iv) Write the name of the next homologue of HCOOH. CH 2 CH 2 H 2 (iii) (iv) CH 4 C l2 HCOOH Page 6 of 14

6 OR/ What is saponification? What are structural isomers? Draw the possible isomers of butane C 4 H10. (iii) Explain the cleansing action of soap and detergents. (iii) C 4 H Draw a labeled diagram of human male reproductive system. Mention the function of testes. Where are they located? OR/ How do the following contraceptives prevent pregnancy Oral Pills Condom Mention the possible misuse of surgical method of birth control by some people. How is this misused method causing harm to the society? State the step taken by the government to prevent this misuse. 25. An object is placed at a distance of one and a half time of the focal length of a convex lens. Find the position of image in terms of f. Also find the magnification and nature of image formed by this lens. Draw a labelled ray diagram to show the formation of the required image in the above case. (f) (1½) f OR/ Name the type of mirror which forms. a virtual and diminished image of an object. A virtual and enlarged image of an object. Draw ray diagram to show formation of image in above two cases. Calculate at what distance should the object be placed from a convex mirror of focal length 20 cm so that it forms an image at 10 cm on the back side of the mirror. Find the magnification produced by the mirror in this case. Page 7 of 14

7 20 cm 10 cm SECTION - B / 26. Solutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four test tubes and some iron nails were placed in each of the solutions. After few minutes, it would be observed that the colour of : all the four solutions changed. solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and that of ferrous sulphate did not change. solutions of zinc sulphate and aluminium sulphate only changed. copper sulphate solution only changed. 27. Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that a layer gets deposited on iron filings. The colour of the coating would be : green blue greenish-blue reddish-brown When the stopper of a bottle containing a colourless liquid was removed, the bottle gave out a smell like that of vinegar. The liquid in the bottle could be : hydrochloric acid sodium hydroxide solution acetic acid saturated sodium bicarbonate solution Page 8 of 14

8 29. In which of the following cases the gas on evolution extinguishes a burning matchstick? III and IV I and II I and III II and IV III IV I II I III II IV 30. Select correct statement about acetic acid : It smells like vinegar and turns red litmus blue It smells like vinegar and turns blue litmus red It smells like lemon and turns blue litmus red It smells like orange and turns red litmus blue 31. In order to find the focal length of concave mirror, image of a distant object is obtained on the screen. Focal length of the mirror can be obtained by measuring the distance between : the object and the mirror the object and the screen the mirror and the screen the mirror and the screen as well as that between the object and the screen. अवतल दप ण क फ कस द र त करन क लय एक द र थत व त क त ब ब एक पद पर लय ज त ह दप ण क फ कस द र त कर सकत ह - Page 9 of 14

9 व त और दप ण क ब च क द र म पकर व त और पद क ब च क द र म पकर दप ण और पद क ब च क द र म पकर दप ण और पद तथ व त और पद क ब च क द र म पकर 32. Following apparatus are made available for finding the focal length of a convex lens. A. A stand with metal needle fixed in it B. A stand with the given convex lens fitted in it C. A thick white card board screen D. A metre scale A student can do experiment by using the apparatus listed as : A, B, C B, C, D C, D, A D, A, B उ ल ल स क फ कस द र त करन क लए न न उपकरण उपल ध कर य गए - A. एक ध वक स चक (needle) लग ह आ ट ड B. एक ट ड जस पर दय गय ल स लग थ C. एक सफ द ग क पद D. एक म टर क ल एक व थ इनम जन उपकरण क सह यत स य ग कर सकत ह व ह - A, B, C B, C, D C, D, A D, A, B 33. Four students A, B, C, D while determining focal length of a convex lens let the light from a distant object pass through a convex lens (focal length 'f') and their respective observation as recorded are that : (A) (B) (C) (D) Converges at focus Appears to diverge from focus Converges at 2 f Appears to diverge from 2 f Which student has made correct observation : (A) (B) (C) (D) च र व थ य A, B, C, D न एक उ ल ल स क फ कस द र त करन क लए द र थत कस व त स आन व ल करण क ल स स ग जरन दय उनक र लय गय ण मश: थ क क श - (A) (B) (C) फ कस पर अ भस रत ह त ह फ कस स अपस रत ह त दख ई पड़त ह 2 f पर अ भस रत ह त ह Page 10 of 14

10 (D) 2 f स अपस रत ह त दख ई पड़त ह कस व थ क ण सह ह - (A) (B) (C) (D) 34. While performing the experiment to trace the path of a ray of light through a glass slab, four students A, B, C, D have drawn emergent ray for the same incident ray PQ as RA, RB, RC and RD respectively : Which of the students has drawn emergent ray correctly? A B C D एक क च क प टक म क श क करण क पथ ख चन क य ग म च र व थ य A, B, C, D न एक ह आप तत करण PQ क लए मश RA, RB, RC, RD नग त करण ख च कसक र ख च गइ नग त करण सह ह? A B C D 35. While performing experiment to trace ray of light through a glass slab a student is asked to draw the boundary of glass slab on the paper. This is done to : see whether it is rectangular or not? ensure that it is always kept within this boundary during experiment. check if it is broken from edges. Page 11 of 14

11 make the diagram more clear. क च क प टक स क श क करण क पथ ख चन क लय एक व थ स सव थम क च क प टक क प रस म क गज पर ख चन क लय कह ज त ह ऐस करन क लय इस लय कह ज त ह त क : यह ज च क सक क क च क प टक आयत क र ह य नह? यह स न त करन क लय क य ग करत समय क च क प टक हम श अपन प रस म म रह यह ज च करन क लय क यह कन र स ट ट ह इ त नह ह च अ धक प बन 36. The diagram given below illustrates : bud formation in yeast binary fission in Amoeba formation of daughter cells in yeast pseudoposida formation in Amoeba 37. In order to adjust the compound microscope for observing binary fission in amoeba using prepared slides, the following steps are required. However these steps are not in proper sequence : (I) Place the slide on the stage (II) Focus the object using low power (III) Adjust the mirror and diaphragm so that sufficient light enters into the microscope (IV) Adjust to high power The correct sequence of these steps is : III, I, II, IV III, II, I,IV I, II, IV, III I, III, II, IV (I) (II) (III) (IV) III, I, II, IV III, II, I,IV I, II, IV, III I, III, II, IV Page 12 of 14