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CBSE Class X 2011 : SCIENCE FOR BLIND CANDIDATES [Set 1]

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CBSE 10
Kendriya Vidyalaya (KV), Kamla Nehru Nagar, Ghaziabad

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I Series" RHB 31 (B) Code No. I em- ;:f . ...----.---,---,----,----.---.-----,1 Candidates must write the Cod e on the title page of the answer-book. '-'----'-_...J......-----'-_-L---''----'-------'I Roll No. tRr8JTm WI" -;t. ep) ~ <PTs -~Cf51 ~ ~-~ 1R~~1 I Please check that this question paper contains 24 printed 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 check that this question paper contains 41 questions . , Please write down the Serial Number of the question before attempting it. 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer script during this period. ~~~Bf&i~~--q;rit~~ ~-q;r it ~ m?T ~ 3W ~ ~~~Bf&i~~--q;rit ~~cnr~ f(Oi&"l1 ~ m--q;r CfiT ~ ~ Wm: 24 ~ "1T"q: Cfils 1PiR CfiT~ 41 ~~ 10.15 ~ ~ 31Cff~~ ~ ~ -a; ~-~ fi:Rc q)f I 10.15 ~ 1R ~ ~ ~ ~ 10.30 ~ -B ~ - I ~cnr~ W1r 1pTI ~-m~~, 15 I fu"@r ~ffi1 Chi ~ ~ -psi - 'T8" I ~WRj I ~--q;r (fCfl ~ ~ ft;r@ I 1R q)f ~--q;r .~ CfiT ~ I it ~' 3fu: ~ ' SUMMATIVE ASSESSMENT - II ~ tffian - II SCIENCE (FOR BLIND CANDIDATES ONLY) flmR - (d;qC1 ~ tR)~ ij;- ~} .- Time allowed : 3 hours Maximum affiICh d4 3-1 (8) 1 Marks : 80 3iCfi : 80 P.T.D. General Instructions: - (i) The question paper comprises of two sections, A and B. You are to attempt both the sections. (ii) All questions (iii) There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such question.s is to be attempted. (iv) All questions of Section A and all questions of Section B are to be attempted separately. (v) Questions questions. sentence. number 1 to 4 in Section A are one mark These are to be answered in one word or one (vi) Questions questions. each. number 5 to 13 in Section A are two mark These are to be answered in about 30 words (vii) ~uestions questions. each. number 14 to 22 in Section A are three mark These are to be answered in about 50 words (viii) Questions questions. each. number 23 to 25 in Section A are five mark These are to be answered in about 70 words (ix) 31 (8) are compulsory. are multiple Questions number 26 to 41 in SectionB 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 N/4/P4 Pt?!tl : (i) rff -# cit JTF{ rr;r I 3fTTFit?J;if ri cfr (ii). ~ (iii) rft JTF{ rr;r TN q;Jf rfr;:r if JTF{ 3iRc174 m itcrfr JTF{ it 'JfT7if it CJfT1T if ~ ~ ~R1&q 1JlfT I &' ~I rJlR J{Jf{f ;:rtf' -# rJlR f?;lrr 1JlfT JTF{ ~ ~ >rRT 3ik 3{ CJfT1T T!!l' rJlR cit ~ w;g >rRT if arrq I Ff -# it R1&q it qf:q - qf:q aicif ~ R1T!: &' I (iv) 3fTTFit TN CJfT1T (v) ~ CJfT1T 3{ it Rit ~ (v i) CJfT1T 3{ it CJfT1T &' (v iii) I 3{ JTF{ Rit ~ it CJfT1T 3f Rit ~ CJfT1T ar it ."ir fClCh fli)' 31 (8) -# ff&;rr ff&;rr it ~ ~ '# 4 it JTF{ 5 "ll.Cfi '# ~ if ~ I aicif ~- ~ JTF{ if ~ it ~ I it rffrr- qf:q aicif it I &' I JTF{ :>/;q/Jllr:4Ch JTF{ ~ I :>/ri)Ch JTF{ itcrfr aicif rfr;:r- rfr;:r &' it JtR if ~ 26 '# 41 it if '# 3fTTFit it ~ &' I it ~ 23 '# 25 ~ 7J~-7J~ m T!!l' - T!!l' JTF{ 14 '# 22 (77NlT 70 it ~ if ~ I CfTcp:r 13 it (77NlT 50-50 JTF{ ff&;rr ci'/gfCIChf47 -:g;;RT 3PfClT JTF{ ff&;rr 31J'F:llfta r.rJ7: 1 (77NlT. 30 - 30 it ar mI ff&;rr ~ JTF{ ~I (ix) CJfT1T R1&q JTF{ T!!l' Rit ~ (v ii) 3{ 3ik. CJfT1T T!!l' "ll.Cfi ~ m ChJ"?/C1 TN q;r -# I 3 4jrn f&:rJ: fClCh f4 I 3 p.T.a. ' SECTION A 'qJ1T 1. How many electrons does a carbon atom need to gain or lose to attain noble gas configuration? 3~ ~ ih:r ~ 2. fq~ Ifl ~~Cf?;T'i >TCf~" ~ ~ 31~ ~ fu"Q: ~ ~ m- .~ ~ COT 31~ CflIT ~ 3"jq("jfl ~ ~ -q ~Wm~ q;1 3"jlq~lIChdl Qtft ~ ? 1 ~ 1 dl~Ff ~ ? IDU ~ 3<.kl~ ~ ~ .cn1 ~ ~ (i) ~ ~ ~ ~~ (ii) ~ 1 q)f (f2IT' lhlChfl ~ I "Hydrogen occupies a unique position in the Modern Periodic Table." Justify this statement. ((3lT~ 1 q VII uJ cnT State the (i) position and (ii) nature of the image formed when an object is placed between the pole and focus of a concave mIrror. ~ 5. >rTl:{f What is meant by heredity ? ~ 4. >JTC<l cnT State the meaning of "vegetative propagation". ((~ 3. at 31TCRffll'(oi) # ~1~~1\jj'i cn1 ~ 31f~ct1'4 ~ I" ~ 2 Cfi~ q;1~~1 6. An element X is placed in the 3rd period and 2nd group of the Modern Periodic Table. ja) (b) 31 (8) Write electronic configuration of the element X. Write the balanced equation of the reaction when this element burns in the presence of air. 4 2 x 3lT~ coW mer mm 3Wffi n~ ~-2 3Wffi BI{ofl ~ ~~ ~I ("~O x cnT ~ mer (31) . ~ ~ mer ~ 31f~ 7. cn1 cnT ~ ~Ol~;j lfRCf ~ # ~ B41Cfi{OI.~ \JI (1 dl I ~ cp:rr dl~4 -;n: q 11RT # ?~ ~ ~ ~o IBe-;(j fWT 'Cf)) QCfiI{1 cnT 3&l~ ~ 2 I I ~ State the meaning of refraction of light when a ray of light travels obliquely from one medium to another. Mention the basic cause of refraction of light. ~ QCfi{OI ft:m t ~ 9. CfT7] I ~ What is meant by sex chromosome? State its two types. Mention the sex chromosomes in male and female of human beings. . fWT 8. fClo:<:jlB ~. # QCfiI~1 ~ ~ 3iYClct'i ~ ~ ~ ~ cnT 312f ~ ~. ~ cnRUT cnT 3~{9 coW QCfiI~1 ~ ~ lTIm-q ~ ~ 2 -rp::r;:r ~ I QCfiI~1 ~ I In an experiment with a rectangular glass slab a student observed that a ray of light incident at an angle of 55 with the normal on one face of the slab, after refraction, strikes the opposite face of the slab before emerging out into air making an angle, of 40 with the normal. Assign the values to the (i) angle of refraction and (ii) angle of emergence. Give justification for assigning these values. fcnm ~ ~ 3i1'QdICfiI{ cnf:q ~ ~ fen ~ ~, ~ ~ 3mfffif ~ ~ ~ ~ ~ ~ cn1 ~ 31 (B) lh(1Cfi 11\ ~ 11\ 31f~. (i) 3iqCld'i ~ ~ 31f~ ~ ~ cnToT ~ ~ "BTlR m 55 n~ Wm: cnRUT ~ cnToT "Cfffi 40 cnT cnToT (ii) HrRT ~ ~ ~ ~, cnToT ~ ~ coW QCfiI I ~ 1R ~ lh(1Cfi ~. CfT7] ~ ~~ 2 m mill ~ ~ ~ # wm ~ I I~ I p.T.a. 5 10. Suggest a reason for -each of the following statements (i) The sun . sunrise. (ii) appears reddish near the : horizon 2 during The clear sky appears blue. ~ q;~ >l~Ch (i) - ~ (ii) me ~ ~ ~ ~~ crnuT ~ 11\ ~ "5RfRr 3"lIChI~1 ~ mN mm ~ "5RfRr mc=rr ~ I 11. State a reason for conserving fossil fuels. List any two disadvantages of burning fossil fuels. ~ ell coT ~4)~~ 'J1<:'1I~ ~ QH m~ ~ cor "ChW crnuT crrffi ~ cor ~~ coT ~ I 'JilcH ciHI~Q\ ~ ~~l~~ I 12. Construct an aquatic food chain showing four trophic levels. ~ "itcTuT coT ~ cm1T "ChW ~ ~ 13. "Reuse strategy is better than statement giving an example. (( q;~ "q9hol coT ~~ 8)<:'1 ~ 'i 1 # de:IQ{OI dQ'41JI ~ coT ~ ~ Cf2IT recycling." Justify this 2 3lf~ ;ft"fu ~ ~ I" ~ I ~ 311=<:1"# ~ :rrr~ ~ , 31 (8) "Q\~'iT~Ch 311=<:1" ~ ~ ~ ~ ~ ~ ~ I 6 2 ciHI~ Q\ I 14. Write formula of ethanol and ethanoic acid. List two physical and two chemical properties to differentiate ethanol from ethanoic acid. "Q\~ 2 ~ ~ I "Q\~ 1JUT~ "Q\~'iT~Ch ~ Cf2IT ~ ~ 3 15. In the Modern Periodic Table Ca (20) is surrounded by Mg (12), K (19), Sc (21) and Sr (38) [atomic numbers of the elements are given in parentheses]. Answer the following questions stating the reason in each case : (i) Which of these elements belong to the same period ? (ii) Which of the surrounding elements has chemical properties resemblipg Calcium ? . (iii) Which one of these elements has the largest atomic radius? 3 - K (19), Sc (21) ~ it Ca (20) ~ 31TCRf flROn 31T~ ~ ~] ~ Sr (38) [~ (f2lT I >l~~ >lCfl{OI .~ ~ Mg (12), . aW. ~ ~ ~ it ~ qV"lIUj flJiiCfl Chlt8Cfl rn ~ it sn\ CWUT . ~: (i) ~ -B Chi rt~ (ii) ~ aW ~ "fI1iR (iii) ~ ~ m ~ it 31TCRf it -B ~ ? W-m ~ ~ ~ -#'<?B~.Ji ~ ~I Q B~ it -B ~ ~ cn1 q{JiIUj ~ ~ ~ ~ ? 16. What is DNA copying ? How many copies of DNA are created in a reproducing. cell ? Why is DNA copying considered an essential part of the process of reproduction? it."(ff.lJ:. ~ Cf<IT f~("Hl ~ ~ 3"11 ~ Cfl Cl~ <J.TIlT cp:ff ~ ?~ ~ ~ ? it."(ff.lJ:. ~ liFIT ~ ~? -q;) 17. What is meant by asexual reproduction? . each of asexual reproduction used organisms, (ii) multicellular organisms. ~ ~ cn1 ~ 31 (B) ~ mr -B Cf<IT 3"lqrtl~ ~ it it."(ff.lJ:. ~ dl~Ff ~ (i) ~ ? c:rrB ~ ~ 'Ch1 ~-mCfiT List two modes by (i) unicellular 3 ~, it 3 (ii) ~ >leiICfl 'Ch1 ~-~ W~ ' ciHI~~1 7 p.T.a. 18. At what distance should an object of height 6 cm be placed from a convex lens of focal length 10 cm to obtain an image at 15 cm from it on the other side ? Find the size of the image in this case. 10 cm it 15 lhl41*i fCflctrll cm il1 ~ ~ it ~ ~ 1R ft.2rn ~ ~ ~.1R ~ ~ 6 cm ~ ~ m?~ >TfC<l il1 ~ coT ~ 3ffi ~ ~ il1. ~ >141'( 1 3 #~ COT m -B ~~I 19. What are fossils ? How are fossils formed ? Describe in brief the method of determining the age of fossils. \J1lClI~lOl CFIT ~ ? \J1lClI~lOl ~ em- cn1 fClf~ COT ~arr ~. ~ CflJ"R ~ ? \J11ClI~lil 3 cn1 ~ R~ ~ 20. All "Homo Sapiens" have originated from a common ancestor and yet they show tremendous variation in size, colour and appearance. Explain in brief. ~ ((~ ~~'''~"I'' ~ ~-~ it~, q)f ~<qq ~, m~ it ~31T 3 t, ~ m ~ "M-~ # f~f4~41H}3m f~~18 ~I~#~~I 21. What is hypermetropia (far-sightedness) ? List two causes for the development of this defect. State in brief how this defect can be corrected using a lens. t?~ ~HI~~ I -Barr # m mr~~ ~-~ ~ CFIT CllI@1 ~ fcnB 31 (B) \lIT ~ il1 ~ fCfi ~ fj41ctl ~ I 8 QR il1 ~ q)f 3q.~lJI ~ 41l'(on ~ cn1 ~ ~ coT' 3 22. A person cannot see an object beyond 2 m distinctly. 'Name the defect he is suffe~ing from. What should be the (i) nature, (ii) focal length and (iii) power of the lens that will correct his vision ? 2 m ~ 31f~ ~ ~ ~ "CfRfT I~ c.1cf cnl ~ coT dfi6hl (i)~, 23. (a) q)T ;w:r ~ mTIf~ (ii) ~ 1:1\ f-JIfi ~ fl ~. ~ fuQ: ~ lhlCflfi ~ ~3TI Cl"?lT ~~ cx:rffii ~ ~ (iii) ~ ~ ~ I~ q)T dq"11JI ~ Cf"1T m-rrr 3 ~ ~ \JlllPII ? What is a spherical mirror? State its two types. Define the following terms related to spherical mirrors: (i) Pole (ii) Centre of curvature (iii) Principal axis (iv) Principal focus (b) A spherical mirror forms a real and inverted image of the same size as the object at a distance of 40 cm from the mirror. Find the (i) focal length and (ii) radius of curvature of the mirror. 5 OR (a) When a ray of light passes from medium A to medium B, it bends away from the normal. Which of the two:"'"A or B, is the optically denser medium? (b) How should a ray of light be incident on a rectangular glass slab so that it ,comes out from the opposite side without suffering any lateral displacement? (c) The focal length of a convex lens is 'f'. How does the size and nature of the image formed by the lens change as the object placed on one side of the lens is brought progressively closer to the focus from a distance 'which is just greater than 2f ? 9 5 p.T.a. (31) Ji'lffill ~ Cf<IT ~ c:fuIT ~ ~ ~ ~ (i) ~ dc01~ ~ CfiT I Ji'l<1111 1:RJ Ch1 ~.~: ~ (ii) Cl hCiI ~ (iii) ~ ~ (i~) (~n ?~ CfilCflfl ~ "CflW ~ ~ CfiT ~ ~ .~ (ii) w.rr em ~ LR W-m 1%"m ~ ~ 40 ciHICiI ~ I ~ ~ Cl hCiI ~ ~ ~ ~ ~ ~ Ch1 ~ (i) lfilCflfl I 3l~ (31) "CflW 51CflI I ~ muT ~ " ~ ~ ~"WR (~n ~ ~lllCiICflI'( (~) lfTm "CflT:q ~ B -q ~ A 31~ LR B, 3lf~ -q ~ ~ ? ~ LR "CflW 51CflI~1 ~~ ~ m muT ~ ~~ ~ ~ ~ RCfl<'l? F-nm ~ ~ Ch1 CfilCflfl ~ ~ ~ ~ ~ ~, ~ ~ ~ ~ ~-~ ~ fen crQ ~ ~ ~ A~ I ~ "$IT ~, lfTm ~lqCi'i ~ lfTm Ch1 ~ ~ ~ 2f ~ ChlCflfl ~ 'f' ~ I~ ~ -q ~ -9 3lf~ me ~ ~ "[fU ~ m~ ~ 1:fRCld'i' LRW-m m ~.~ .~ q;) ? 24. (a) Ethene is formed when ethanol is heated at 443 K with excess of cone. H2S04, State the role' of cone. H2S04 in . the reaction. Write structural formula of ethene and balanced equation of the reaction. (b) What is soap ? A soap 'is not found effective where water is hard. Why? Mention the chemical composition of the detergent used to wash clothes with hard water. 'OR 31 (B) 10 5 (a) Two hydrocarbons A and B have the formula C3H6 and C3Hs respectively. Which one of the two is (i) a saturated compound, (ii) an unsaturated compound, (iii) most likely to show addition reaction ? Justify your answer of (i), (ii) and (iii). (b) With the help of a chemical equation show how an addition reaction is used in vegetable ghee industry. ,State the common name of this reacti9n in the industry. (31) 443 K ~ 11\ ~~ 11\ ~~ ~ {9 ~ qffiT 31f~ (~f) ~ ~ t ~ it ~ CfiT 1R ~ 31 ~ ~ m~ '1Wf H2SO 4 ~ fufunJ: (f~ fi{~rj I,JiCf) ~ f1xoil Cf){O fufunJ: I ~ ffic ~,~ ~ ~ I ~,~ I t c ~ ~ ~~-B~ I ~CFIT~? q 41 J I ~ I~ CfiT ~ ?~ ~~~ d t ~ CfiT d ~ ~ 31Tf~ cnT' >rwfr ~~fu"Q: CfiT ~ fi fll'l~I: C3H6 q Ji 11JlCf) 5 (f~ C3Hs J lorj fufunJ: I 3l~ (31) ~ QI~~1Cf)14rjl A (f~ B ~ ~ ~ Chlrjfll (ii) Chlrjfll'31fiQl(1 t, fiQL{1 ~ (iii) ~ ~ "B~~? ~ ~ ~, fiCf)~H 31f~ (i), (ii) cr (iii) ~ arrU ~ ~ ~ -B ~ ~ 31f~Cf)dJi ~ ~ 31f~ 31 (8) I~ QI~~1Cf)14.,1 t i (i) (~) W f1JOilCf){OI~ f1Qllidl rj qffiT fi Cf)<'j 31f~ CfiT '81Ji l;:;q ;:rp:r CfiT d~ ~ Cfrjfl:lm {9 ~ err it ~ I~ dq~lJI if ~ ? CFIT 11 p.T.a. 25. List in tabular form any five differences between "sexual reproduction" and "asexual reproduction". 5 OR (a) (b) ((~ ~. What is pollination? Mention in brief its two types. List in tabular form any two differences between the processes of pollination and fertilisation. ~" fll'(On C12lT ((~ it ~ # it ~ ~ ~" ~~ 5 ~ ciF"II~Q\ 3l~ (31) q,(IJIOI (q-) lj~I~IUI (f2lT fll{On CFtT ~ ?~ ~~ ti~il.,~aTI it ~ # ciHI~Q\ # 3&l'@ ~ q)f ~ it irq ~ ~ ~ I ett ~ 1 SECTION B cqm'af 26. While conducting the experiment on tracing the path of a ray of light, through a rectangular glass slab, a student uses the protractor (Dee) for measuring the angles of incidence and of emergence. He should place the "zero" of the protractor at the points of incidence and emergence of the rayon the slab and the base line of the protractor should be along the (A) face lines of the glass slab at the points of incidence and emergence respectively. (B) face line of the glass slab at the point of incidence and the normal at the point of emergence of the ray. (C) normals at the points of incidence and emergence respectively. (D) normal at the point of incidence and the face line of the glass slab at the point of emergence of the ray. 12 1 ~ '1~ ~ it fcrm~ ~ 11\ ChT ~ ~ # 3i I q CfiT \3 q l=fTqCf) ~" III ("11 fiI\ C itm. ~ (ctTuT it 3i Cfifq 4l J I ~ ("1 '"1 it fcn\uT Fn ~ c8 s:f)JOHI: 3ilq("1'"1 d2TT R*l (B) CfiTuTI fcn\uT CfiT 7llR it .~ ChT ~ R ~ it ~ ~ ~ 3i I q ("1 '"1 Cf R1fd ~3TI 11\ ~ mr ~3TI it~ I ~ 31f~ I >rcnR ~ (A) R1fd d~ Cf) IT c8 51 I ~ I Cfi ~ ~ m 3i1 q("1'"1 ~ 1:R Cfifq ~ aTI~it (C) s:f)J04~I: (D) 3i IQ ("1'"1 ~m 3iIQ("1'"1 ~R*l ~ 1:R 31f~ 1:R Cfifq mr c8 ~ .~ it ~ d~ mr c8 ~ R1fu ~ 1:R I ~3TI1:R 31f~ it ~ d~ ~cfit~mrit~m it ~ R1fd ~ m 11\ CfiT:q I it I 27. While tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence, a student measured the angles of refraction and emergence in each case. He recorded his observations in the table as given below: 4r 30 40 60 50 40 36 28 30 59 52 refraction Angle ofof emergence Angle B.No. - 1 The correct observation is (A) 1 (B) 2 (C) (D) .4 31 (8) 3 13 p.T.a. CfiTq ~ ~ 3"\1'4dICflI{ fcwrT 3"\ ~ -mf'q?f TflV1 "Cf~ ~ Cf)f q Cl d"i q ~j~1{ "# iR ~ ~ iR ~ m#~ 3"\lqd"i ~ ~ fqm2ff ~ 51CflI~1 51 Cfl 51Cfl{OI til ~ . 3"\ I "f.:rrRf ~ ~ lfTY"ffi I~ ~ 9;~ coT ~ ~~ "# fu"&T : 60 36 59 40 q Cl ct"i cn1uT 50 40 4r 28 52 30 q 3"\ cn1uT Rlfu cn1uT C'1"""I 1 ~~~~ (A) 1 (B) 2 (C). (0) 4 3 28. A student was given the following suggestions by his fellow student for performing the experiment. on finding the focal length of a concave mirror. I. Select an object very far away from the laboratory window. II. IV. Select a well illuminated object far, but not. very far, from the laboratory window. Keep all lights of the laboratory on~ Place the mirror between the object and the screen. V. Place the screen between the object and the mirror. VI. Obtain the sharpest image of the object on the screen. Ill. He can perform suggestions : the experiment better (A) I, V, VI (B) I, III, VI (C) II, IV, V (D) II, V, VI 31 (B) .14 by following the ~m#~ ~ ~ ~ .~ ern ifi ~ CfiT ~ ~ >rfCd" ~ "1flIT I q d fI Cfl'~B1 ~/~ (A) ~ (B) ~ (f2IT (C) ~'(f2lT~ (D) ~ ~ ifi ~ (f2lT ~ ~.ifi 3i ~ cn1 IDU ~ lhl Chfl ~ Rmfu:r ~ ? _ cn1 ~ ~ cn1 ~ ifi ~ cn1 ~ ifi ~ (f2lT ~ 3iqdfl ~ cn1 ~ ifi m~ ~ ifi ~ (f2lT ~ cn1 ~~ 30. A student obtains a blurred image of an object on a screen by using a convex lens. In order to obtain a sharp image, he will have to shift the lens (A) slightly towards the screen. (B) slightly away from the screen. (C) slightly either towards or away from the screen depending upon the position of the object.. (D) to a position very far away from the screen. c@t ~ Ffm~ ~ ~ I~ "ffi:r IDU ~ ~ ~ >ITLd" ~ ~ ern ifi ~, CfiT ~~ >rT((f ~ ~ "ffi:r 'Cf)) ~ ~ ~ cn1 Wlfu Cfi8T WIT (A) ~ ~ cn1 3ffi (B) ~ ~ -ft ~ (C) ~ ~ cn1 3ffi -ft ~ ~ 312TCn ~ ~ ~~ (D) 31 (8) ~ cn1 Wffif ~ 16 -ft ~, 1:R 1 31. Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be (A) blue (B) brown (C) green 1 (D) yellow ~ B ~2' ifi ~ f~fC ( ,i'j Cf1T if mm ~ TP1T -{1rWrr (A) ;ft"ffi (B) (C) .Q\T (D) 32. A student put four big iron nails, one each in four test tubes, containing aqueous solutions of aluminium sulphate, zinc sulphate, copper sulphate and ferrous sulphate. Mter about an hour, a reddish-brown coating was observed only on the -surface of one iron nail that was put in the solution of 1 (A) aluminium sulphate. -, (B) zinc sulphate. (C) copper sulphate. (D) ferrous sulphate. m;r ~ cnW B~2', ~ Ch1 ~ Drcf; B~2', ~, ~-~ ~a:rrT ~ ~ 3ffi ~ ~ (B) ~ ifim ~~ ~ ~ (f~ I ~'qlT ifi ~ ~ m B~2' ~ eruZ %~ q{~'i(11 if ~ ~ ifi \i1ctl;q ~<1;q'i ifi q~:ql~ -m ~-~ ~~ CfQ ~ ~ ~ ~~ cnm H~2' (D) ~ ~_ @lq) B~2' (C) B~2' '51<1(11 ~ CfQ cn1B (A) ~, ~ ~ ~~ ~ 31 (8) Bc%2' B~2' 17 p.T.a. 33. To aqueous solutions of AI2(SO 4)3' ZnSO 4' CuSO 4 and FeSO 4 contained in four different beakers, zinc granules were added. Deposition of metal on zinc will be observed in beakers containing solutions of 1 (A) Al2(SO 4)3 and ZnSO 4 (B) ZnS04 and FeS04 (C) FeS04 and CuS04 (D) CuSO 4 and AI2(SO 4)3 ~ ~ ~ f~ crflCfl:li it ~ fq~~'il it Bfcn ~ ~a:rur ~ CfiT Al2(SO 4)3' ZnSO4' CuSO 4 (f~ FeSO 4 ~ ~ sm ~ ~ ~ crflCflD it m WIT ~ I Bfcn ~ ~ "TB" "CR ~3TI ~ (A) Al2(SO 4)3 Cf ZnSO4 ~ "M<1~rj (B) ZnSO4 Cf FeSO 4 ~ "M<1~rj (C) FeSO 4 q C~SO4 ~M<1~rj (D) CuS04 q Al2(SO 4)3 . it 'fCl~~rj 1 34. The odour of acetic acid is similar to that of (A) Orange (B) Rose water (C) Ethanol (D) Vinegar I ~~Ch1Tf~~it-B~tmm-ill~ (A) 'BWf (B) 2<1liii (C) ~~ (D) ftRCfiT 31(B) ~ 18 35. When some acetic acid is. added to sodium hydrogen carbonate powder in a beaker, a gas is evolved. Which one of .the following statements is "Not True" for this gas ? 1 (A) It turns lime water milky (B) It extinguishes a burning splinter (C) It dissolves in water (D) It burns with a pop sound ~ ~ "fcFim ~ if ~ ~ ~ ~1~'51\JH ~ ikr fl1~118 ~, err ~ if ~ Cf)i~~1 Cfi2f1 ~ (A) 71Q ~ (B) 71Q \Jl(1ct1 m-m (C) 71Q ~ (D) 71Q 1lTq ~ it q;) ~ if ~ ~ ~ it ffm: W~ Cfi\ ikr -qr;IT. coT 111-:5-5\ "- ~ P1Cfiflct1 ~ ((~ ~ ~" I~ if ~ Cfi~ ~? ~ ~ ~ \Jj<1dl ~. 36. In order to adjust the compound microscope for observing binary fission or budding with the help of prepared slides, the .following steps are required : 1. Place the slide on the stage. II. III. Focus using low power. Adjust the mirror and diaphragm so that . amount of light enters into the microscope. IV. Adjust to high power. The correct sequence of the above steps is (A) III,' I, II, IV (B) III, II, I, IV sufficient 1 (C) I, III, II, IV (D) .1, II, III, IV 31 (B) 19 P.T.O. ~ ~ ~ 011~SI cn1 cn1 ~ TRDif 1. ~ c{r fi~Ul II. R"kf ~ III. ~ IV ~ mm ~ : lfq (~) 1R >ICf)I~1 ~ fu-'0o:s~ m m~ ~ cw:rr m :!1i<?H COT~8JUJ 31~ ~ ~ ~ I ~ dq41JI IDU ~ c=r~:S1;q15f)1~ c t Q;QfC(1 -B COT ~~1'41\JH ~ ~~ 3"11 CI~ ;q Cf) f11 . 011~:S c t ~QI;qfll ~ I Cfi8T fen *i~ if I 1R ~~1'41\jj~ qwrr I ~~COT~~~ (~) III, I, II, 1'1 (B) III, II, I, 1'1 (C) I, III, II, 1'1 (D) I, II, III, 1'1 37. ~ slide shows a cell dividing in the centre. This slide could be showing (~) budding in yeast (B) budding in ~moeba (C) binary fission in yeast (D) binary fission in ~moeba ~ 011~:S fcnm ~ ~ 011~:sm Wt (~) ~ (B) ~'if (C) ~ (D) . ~ 31 (8) ~ 11~ mm ~ if :t1i(1~ :t1i(1~ if fu-~ if fu-~ 20 'qTT[ if ~ m-m ~~Ihfl~ I 1 38. Upon observing the slides showing stages of reproduction in yeast and amoeba four students, I, II, III and' IV, reported their observations as given below: ' I. Cytokinesis was seen in the yeast cell. II. A chain amoeba. III. Elongated nucleus was dividing to form two daughter nuclei in amoeba. ' IV. Single cells of amoeba and yeast were undergoing ,binary fission and budding respectively. of buds - was seen due to reproduction In The correct observations are that of student(s) 1 (A) I and II (B) II only (C) III and IV (D) I, III and IV ~ ~ it it ~ if ~ (f~ ~ q~:qIC"l ~ .q?r ~ I, II, III (f~IV, ~, 11~~1CfiT ~ ~ am ~ ~. Q-a,:rur m fu-@ if I. ~ ~ II. ~ if ~ III. ~ if ~ R~I{ ~ ~1Cf)1$\0ll-~ it CORUT cfit ~ Ct;~Cf) ~ 1m R~I{ ~ I eft Ct;~ch1' cn1 ~ it ~ ~mm~1 IV. ~ ~ ~1i~Hm ~ ~ ~ ~ m~ f(1~~ cfit ~ ~aTI CfiT flJOj~I: (f~ I CfK1T/~ ~ ~(~) (A) I (f~ II (B) ~ (C) III (f~ IV (D) I, III (f~ 31 fB) fu-~ 21 II IV p.T.a. 39. For determining the percentage of water absorbed by raisins in a given time, apart from water, raisins and a watch, we shall also require (A) a beaker, a graduated cylinder, a thermometer, a filter paper (B) a beaker, a weighing balance, a thermometer, a filter paper . (C) a graduated cylinder, a thermometer, a weighing balance, a watch glass (D) a beaker, a graduated weighing balance ~ ~ ~ il1 ~, q ~II Cfld 3"11 31 (B) ~ I "BlflT ~, Ql-rIT #~ ~ cylinder, a thermometer, a WI ~ Cf2IT : 22 ~ ~ il1 ~ Cf>1. >rfd~lddl ~ ~ ~ ~ 1 40. If WI represents weight of dry raisins and W 2 represents weight of soaked raisins, then the percentage of water absorbed by raisins is 1 W2 - WI x 100 W(A) W2 WI WI - W2 W2 WI (B) (C) ~ WI ~ cn1 ~ ~ ~ t, .0) it 'qR cn1 ~ (1~ W2 '4rft ~ mT ~ ~ it 'qR qfj- >Jfu~lddl ~ 100 (A) W2 - WI x 100 W2 W2WI W2 - W2 WI WI (B) (C) (D) 31 (B) 23 P.T.D. 1 41. A student soaked 15 g of raisins in 40 mL of water in beaker X and 30 g of raisins in 80 mL of water in beaker Y ~t room temperature. He measured the quantity of water left in the beakers after about an hour. He would observe that (A) there is no change in the quantity of water in beakers X and Y. (B) the beaker Y has as much water as in the beaker X. (C) 1 the beaker Y has more water than beaker X. (D) the beaker X has more water than beaker Y. fcnm ~ ~ it dN 1R ~ Y -q 30 ,g ~ ~~ -q ~2IT ~ 1~ ~ ~<qlT l:frlT I CiQ ~ (A) GJ;n ~lCh{j, X ~~ it X 15 g~, q;) 80 mL ~ q;) 40'mL -q q ~ill (( GJ;n 41 Ch~:r -q ~ -q f~ I 'cn1 1IDIT q;) ~ eWrr fen q Y, -q ~ cn1 -q ~ l=JT;jT \:fRQc1'i ~ Q1m, / (B) ~ Y (C) ~ y-q (D) ~ X -q ~ ~ cn1 ~ ~ ~ X-q -q ~ ~ ~ Y l=JT;jT X ~ ~ it ~{I~{ ~ -B ~'~ -q ~ -q ~ ~ 3lf~ ~ -B 3lf~ ~ II ! 31 (8) 24 1,000

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Additional Info : Solved CBSE Class 10 Board exam paper study guide - CBSE 2011 : SCIENCE FOR BLIND CANDITATES - C.B.S.E. Free Online Question Paper
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