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 : (i) (ii) (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.
SECTION-A / 1. Mention the percentage of carbon in earth s crust. 2. Name the part responsible for the power of accommodation of the human eye. 3. State two advantages of paper bags over plastic bags during shopping. 4. Which one of the following is always at the third trophic level in a food chain? Carnivores, herbivores, producers, decomposers 5. Given below is a list of elements along with their atomic numbers in parenthesis. A(6), B(8), C(10), D(12), E(14), F(16) Select the element which has : two shells both of which are completely filled with electrons. the electronic configuration 2, 8, 2 a total of three shells, with four electrons in its valence shell. (d) a total of two shells, with four electrons in its valence shell. A(6), B(8), C(10), D(12), E(14), F(16) 2, 8, 2 (d) 6. X is an element with atomic number 20. (i) Is it a metal or a non metal? (ii) Which of the two X or Mg with atomic number 12 is more reactive? (iii) What is the valency of X? (iv) What will be the formula of its chloride? X 20 (i) (ii) X Mg 12 (iii) (iv) X Page 3 of 16
7. What is the fate of the ovules and the ovary in a flower after fertilization? How is the process of pollination different from fertilization? {ZfoMZ Ho$ nímmv {H$gr nwîn ~romês> VWm AÊS>me H$m ³ m hmovm h? {ZfoMZ H$s à{h«$ m namju go {H$g àh$ma {^Þ hmovr h? 8. Write two functions each of : Testis Ovaries àë oh$ Ho$ Xmo-Xmo H$m {b{ie & d fu AÊS>me 9. A ray of light strikes the surface of water such that its speed in water is 2.25 x 10 8 m/s. If absolute refractive index of water is 4/3, find the speed of light in air. 2.25 10 8 ms 1 4/3 10. What is meant by least distance of distinct vision? How does this vary between the very young and old people? 11. Explain why the colour of the clear sky is blue. 12. Why should fossil fuels be used judiciously? Write any two reasons. 13. Name the three `R s to save environment. Explain any one with the help of one example. (Write in full form) R 14. Identify from the following the hydrocarbon that undergo addition reaction : C 3H 8, C 2H 6, CH 4, C 2H 4. Justify your answer. Write the name of the homologous series to which they belong to. C 3H 8, C 2H 6, CH 4, C 2H 4 15. The position of three elements A, B and C in the modern periodic table is shown below : Page 4 of 16
Giving reasons, explain the following : Element A is a metal. Atom of element C has a larger size than atom of element B. Element B has a valency of 3. A, B C A B C B 3 16. Mention two secondary sexual characters in human male. Why testes in male body are extra-abdominal? Write the dual purpose served by urethra in males. _mzd Za Ho$ Xmo {ÛVr H$ m Z bjum H$m CëboI H$s{OE& mzd Za Ho$ d fu CXa Jwhm Ho$ ~mha ³ m hmovo h? mzd Za Ho$ yì_mj Ûmam {H$E OmZo dmbo Xmo H$m {b{ieÿ& 17. Given below is the experiment carried out by Mendel to study inheritance of two traits in garden pea. Page 5 of 16
What do A, B, C, D, E, F and G represent in these boxes? State the objective for which Mendel performed this experiment. A, B, C, D, E, F G 18. From the set of Figures given below, make a pair of (i) homologous and (ii) analogous organs. State the reason in each case to justify your answer. Page 6 of 16
(i) (ii) 19. What are fossils? How are they formed? How is the age of a fossil determined? 20. Give reasons for the following : Concave mirror is used by dentists. Convex mirrors are commonly used as rear view mirrors in vehicles. Convex lens is used as a magnifier. 21. A convex lens of focal length 40 cm and a concave lens of focal length 50 cm are placed in contact with each other. Calculate the power, and focal length of this lens combination. 40 cm 50 cm 22. State the cause of dispersion, when white light enters a glass prism. Explain with a diagram. 23. Write the name of the following compound : CH 3CH 2COOH, C 6H 6 Page 7 of 16
What is a homologous series? Write the formula of functional group of ketone and aldehyde What will happen if methanol reacts with ethanoic acid in the presence of an acid? Name the reaction. Write the chemical equation for this reaction. CH 3CH 2COOH, C 6H 6 OR/ (i) How will you bring about following reactions? Write the concerned chemical equation : Ethanol to Ethane Ethanol to Ethanoic acid. (ii) Give one example with chemical equation for following reactions : Substitution reaction. Saponification reaction. Combustion reaction. (i) (ii) 24. List two advantages of sexual reproduction over asexual reproduction. Name the type of asexual reproduction seen in : (i) Plasmodium (ii) Planaria Draw a diagram of Rhizopus showing the location of : (i) Sporangium (ii) Rhizoidal hyphae. (d) How will an organism be benefited if it reproduces through spores? Ab {JH$ OZZ H$r VwbZm b {JH$ OZZ Ho$ Xmo bm^ H$s gymr ~ZmBE& ZrMo {XE JE Ordm {XImB XoZo dmbo Ab {JH$ OZZ Ho$ àh$ma H$m Zm {b{ie- (i) ßb Á mo{s> (ii) ßb Zo[a m ambμomong H$m AmaoI Ir MH$a {ZåZ{b{IV H$s pñw{v Xem BE - (i) ewõ ~romuwymzr (ii) ambμomong H$m H$dH$ Omb (d) ~romuw Ûmam OZZ go Ord {H$g àh$ma bm^mpýdv hmovm h? OR / AWdm Draw a diagram to show human male reproductive system and label the following organs : seminal vesicle, prostate gland, vas deferens, penis. List two contraceptive methods and state two benefits of adopting these methods. mzd Za OZZ V Ì H$m AmaoI ItMH$a ZrMo {XE JE ^mj Zm m {H$V H$s{OE - ewh«$me`, àmoñq>oq> J«{W, ewh«$dm{hzr {eíz$ Xmo J^ {ZamoYH$$ {d{y m H$s gymr ~ZmBE VWm BZ {d{y m H$mo AnZmZo Ho$ Xmo bm^ {b{ie& Page 8 of 16
25. Define power of a lens. An object is kept at a distance of 18cm, 20cm, 22cm, and 30cm, from a lens of power +5D. (i) In which case or cases would you get a magnified image? (ii) Which of the magnified image can be got on a screen? List two widely used applications of a convex lens. +5D 18cm 20cm, 22cm, 30cm (i) / / (ii) OR/ A very thin narrow beam of white light is made incident on three glass objects shown below. Comment on the nature of behaviour of the emergent beam in all the 3 cases. There is a similarity between two of the emergent beams. Identify the two. When light enters from air to glass the angles of incidence and refraction in air and glass are 45 and 30 respectively. Find the refractive index of glass. (Given that sin 45 = 1 ; sin 30 =1/2) 2 45 30 sin 45 = 1 2 ; sin 30 =½) SECTION - B / 26. A thin plate of zinc metal is placed in a beaker containing aqueous ferrous sulphate solution. The zinc plate is taken out after 15 mins. The colour of solution changes to: deep yellow deep green light blue (d) colourless. Page 9 of 16
15 (d) 27. When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change which is observed is: the green solution slowly fades the lower end of the test tube becomes slightly warm a colourless gas with the smell of burning sulphur is observed (d) light green solution changes to blue. (d) 28. Deepa was asked to identify bottles of acetic acid from a shelf where a number of other labelled bottles were placed. She reads the labels as : (i) Vinegar (ii) Formic acid (iii) Ethanoic acid (iv) Ethanol Correct identification would be- i,ii i, iv ii, iv (d) i, iii द प क एक श फ पर रख बह त स न म कत ब तल म स ए स टक अ ल क पहच नन क लय कह गय इन ब तल पर लख न म थ (i) सरक (ii) फ म क अ ल (iii) ऎथ न इक अ ल (iv) ऎथ न ल सह पहच न ह ग i,ii i, iv ii, iv (d) i, iii 29. Manoj was asked to list the properties of acetic acid after he had studied them in the laboratory. According to him acetic acid (i) is insoluble in water. (ii) turns blue litmus paper red. (iii) reacts with Na 2CO 3 to form NaOH and CO 2. (iv) has sweet smell like perfume. i ii iii (d) iv मन ज न जब ए स टक अ ल क ग ण क अ ययन य गश ल म कर लय त उस उन ग ण क स च बन न क लय कह गय उसक अन स र ए स टक अ ल क ग ण न न ह (i) यह जल म अ लनश ल ह (ii) यह न ल लटमस क ल ल कर द त ह (iii) यह Na 2CO 3 स अ भ य करक NaOH और CO 2 बन त ह (iv) इसक ग ध इ ज स ह उसक र लख गय सह ग ण क वल ह i ii iii (d) iv Page 10 of 16
30. Ethanoic acid was added to Sodium bicarbonate solution and the gas evolved was tested with burning splinter. Which one of the following four observations is correct? The gas burns with pop sound and the flame gets extinguished. The flame gets extinguished and gas does not burn. The gas burns with a blue flame and the splinter burns brightly. (d) The gas is brown in colour. ऎथ न इक अ ल क स डयम ब ईक ब न ट वलयन म मल य गय और नकलन व ल ग स क पर ण एक जलत त ल स कय न न च र ण म स क न स ण सह ह? ग स प प व न स जलत ह और त ल ब झ ज त ह त ल ब झ ज त ह और ग स नह जलत ग स न ल ल स जलत ह और त ल त चमक स जलत ह (d) यह ग स भ र र ग क ह 31. A student suggested the following guidelines to his friend for doing the experiment on finding the focal length of a convex lens. A : Select a distant tree or building as object. B : Use a thin white paper to act as a screen. C : Place the convex lens in front of screen and adjust it to get clear image on the screen. D : Measure the distance between the lens and the screen. When he showed these guidelines to his teacher, the teacher modified the guidelines labelled as A B C (d) D A : B : C : D : A B C (d) D 32. While determining the focal length of a concave mirror by forming an image of a distant object, the screen should be placed at the back of mirror in front of the mirror at right angle with plane of mirror (d) any where near the mirror (d) 33. To determine the focal length of given convex lens a student focussed the image of a distant object on a screen using the lens. To get the correct value of focal length he should measure the distance between object and the screen object and the lens screen and the lens (d) object and the image Page 11 of 16
(d) 34. While performing the experiment on tracing a ray of light passing through a rectangular glass slab, the inference given by four students after measuring angles of incidence, refraction and emergence is as. angle of refraction is greater than angle of emergence angle of refraction is equal to angle of emergence angle of incidence is greater than angle of emergence (d) angle of incidence is equal to angle of emergence Which student has given correct inference? A B C (d) D (d) A B C (d) D 35. A student has to perform an experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Which of the following figures shows correct labelling so that he can get a correct measure of the angles of incidence and the angles of emergence? Page 12 of 16
A B C (d) D A B C (d) D Page 13 of 16