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CBSE Class X 2014 : SCIENCE

24 pages, 202 questions, 86 questions with responses, 159 total responses,

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

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H$moS> Z . Series HRS Code No. amob Z . 31/1 narjmWu H$moS >H$mo C ma-nwp VH$m Ho$ _wI-n >na Ad ` {bIo & Roll No. Candidates must write the Code on the title page of the answer-book. H $n`m Om M H$a b| {H$ Bg Z-n _o _w{ V n > 24 h & Z-n _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Z ~a H$mo N>m C ma -nwp VH$m Ho$ _wI-n > na {bI| & H $n`m Om M H$a b| {H$ Bg Z-n _| >42 Z h & H $n`m Z H$m C ma {bIZm ew $ H$aZo go nhbo, Z H$m H $_m H$ Ad ` {bI| & Bg Z-n H$mo n T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h & Z-n H$m {dVaU nydm _| 10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>m Ho$db Z-n H$mo n T>|Jo Am a Bg Ad{Y Ho$ Xm amZ do C ma-nwp VH$m na H$moB C ma Zht {bI|Jo & 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 42 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-book during this period. g H${bV narjm II SUMMATIVE ASSESSMENT II {dkmZ SCIENCE {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 90 Time allowed : 3 hours 31/1 Maximum Marks : 90 1 P.T.O. gm_m ` {ZX}e : (i) Bg Z n H$mo Xmo ^mJm|, ^mJ A Am a ^mJ ~, _| ~m Q>m J`m h & AmnH$mo XmoZm| ^mJm| Ho$ Zm| Ho$ C ma {bIZo h & (ii) g^r Z A{Zdm` h & (iii) AmnH$mo ^mJ A Am a ^mJ ~ Ho$ g^r Zm| Ho$ C ma n WH $-n WH $ ^mJ Ho$ AmYma na {bIZo h & (iv) ^mJ A Ho$ Z g `m 1 go 3 Ho$ Z EH$-EH$ A H$ Ho$ h & BZHo$ C ma EH$ e X AWdm EH$ dm ` _| X| & (v) ^mJ A Ho$ Z g `m 4 go 7 Ho$ Z Xmo-Xmo A H$m| Ho$ h & BZHo$ C ma bJ^J 30 e Xm| _| XoZo h & (vi) ^mJ A Ho$ Z g `m 8 go 19 Ho$ Z VrZ-VrZ A H$m| Ho$ h & BZHo$ C ma bJ^J 50 e Xm| _| XoZo h & (vii) ^mJ A Ho$ Z g `m 20 go 24 Ho$ Z nm M-nm M A H$m| Ho$ h & BZHo$ C ma bJ^J 70 e Xm| _| XoZo h & (viii) ^mJ ~ Ho$ Z g `m 25 go 42 Ho$ Z `moJm _H$ H$m eb na AmYm[aV ~h {dH$ nr Z h & `oH$ Z EH$ A H$ H$m h & {XE JE Mma {dH$ nm| _| go AmnH$mo Ho$db EH$ g~go Cn`w $ {dH$ n MwZZm h & 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) All questions of Section A and all questions of Section B are to be attempted separately. (iv) Question numbers 1 to 3 in Section A are one-mark questions. These are to be answered in one word or in one sentence. (v) Question numbers 4 to 7 in Section A are two-marks questions. These are to be answered in about 30 words each. (vi) Question numbers 8 to 19 in Section A are three-marks questions. These are to be answered in about 50 words each. (vii) Question numbers 20 to 24 in Section A are five-marks questions. These are to be answered in about 70 words each. (viii) 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. 31/1 2 ^mJ A SECTION A 1. 1 AmYw{ZH$ AmdV gmaUr Ho$ nhbo g_yh Ho$ V dm| Ho$ {H$ ht Xmo JwUY_m o H$s gyMr ~ZmBE & List any two properties of the elements belonging to the first group of the modern periodic table. 2. OrZ `m hmoVm h ? What is a gene ? 1 3. AnZo X {ZH$ OrdZ go Eogo EH$-EH$ Kaoby An{e Q> H$m CXmhaU Xr{OE {OgH$m nwZ: Cn`moJ Am a nwZ: MH $U ^mdr $n _| {H$`m Om gH$Vm h & 1 Give one example each from your daily life where the domestic waste can be effectively reused and recycled. 4. _mZdm| Ho$ ewH $mUwAm| Am a A S>m| Ho$ ~rM _wI A Va `m h {b{IE & ? Bg A Va H$m _h d 2 What is the main difference between sperms and eggs of humans ? Write the importance of this difference. 5. CZ Xmo g ^m{dV VarH$m| H$s gyMr ~ZmBE {OZHo$ mam {H$gr AdVb Xn U mam CgHo$ gm_Zo p WV {H$gr {~ ~ H$m Amd{Y V {V{~ ~ ~Zm`m Om gH$Vm h & BZ XmoZm| {V{~ ~m| Ho$ ~rM, `{X H$moB A Va hmoVm h , Vmo CgH$m C oI H$s{OE & 2 List two possible ways in which a concave mirror can produce a magnified image of an object placed in front of it. State the difference, if any, between these two images. 6. AnKQ>H$ `m hmoVo h ? n`m daU _| BZH$s Xmo _h dnyU ^y{_H$mAm| H$s gyMr ~ZmBE & 2 What are decomposers ? List two important roles they play in the environment. 7. mH ${VH$ g gmYZm| H$m g nmo{fV ~ YZ `m| Amd `H$ h ? Xmo {d{Y`m o nwZ: Cn`moJ Am a nwZ: MH $U _| go {H$go `dhma _| bmZo H$m Amn gwPmd X|Jo Am a `m| ? 2 Why is sustainable management of natural resources necessary ? Out of the two methods reuse and recycle which one would you suggest to practise and why ? 8. H$m~ Z `m {JH$m| H$s g_OmVr` lo{U`m `m h ? Eop S>hmBS>m| H$s g_OmVr` loUr Ho$ Xmo H $_mJV gX `m| Ho$ Amp dH$-gy {b{IE & C oI H$s{OE {H$ BZ `m {JH$m| H$m H$m Z-gm ^mJ BZHo$ (i) ^m {VH$ Am a (ii) amgm`{ZH$ JwUY_m o H$m {ZYm aU H$aVm h & 3 What are homologous series of carbon compounds ? Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their (i) physical and (ii) chemical properties. 31/1 3 P.T.O. 9. H$moB H$m~m}p g{bH$ A b (Amp dH$-gy C2H4O2) C oaH$ Ho$ $n _| {H$gr A b H$s Cnp W{V _| {H$gr Eo H$mohm b go A{^{H $`m H$aHo$ EH$ `m {JH$ X ~ZmVm h & `h Eo H$mohm b jmar` KMnO4 Ho$ gmW Am grH$aU Ho$ n MmV A brH$aU H$aZo na dhr H$m~m op g{bH$ A b C2H4O2 ~Zm XoVm h & (i) H$m~m}p g{bH$ A b, (ii) Eo H$mohm b VWm (iii) `m {JH$ X Ho$ Zm_ Am a g aMZm {b{IE & 3 A carboxylic acid (molecular formula C2H4O2) reacts with an alcohol in the presence of an acid catalyst to form a compound X . The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid C2H4O2. Write the name and structure of (i) carboxylic acid, (ii) alcohol and (iii) the compound X . 10. Mma V dm| A, B, C Am a D Ho$ na_mUwAm o _| BZHo$ Bbo Q >m Z VrZ H$moem| _| {dV[aV h VWm BZHo$ ~m V_ H$moem| _| Bbo Q >m Zm| H$s g `m H $_e: 1, 3, 5 Am a 7 h & BZ V dm| H$mo AmYw{ZH$ AmdV gmaUr Ho$ {H$g AmdV _| aIm Om gH$Vm h ? A Am a D Ho$ na_mUwAm| H$m Bbo Q >m {ZH$ {d `mg {b{IE VWm A Am a D Ho$ g `moJ go ~ZZo dmbo `m {JH$ H$m Amp dH$-gy {b{IE & 3 The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine. 11. {Z Z{b{IV gmaUr H$m A ``Z H$s{OE {Og_| N>: V dm| A, B, C, D, E Am a p W{V`m CZH$s AmYw{ZH$ AmdV gmaUr _| p W{V`m| Ho$ AZwgma Xem B JB h : g_yh AmdV 1 2 A 2 3 12 13 14 15 16 17 B 3 D E Cn`w $ gmaUr Ho$ AmYma na {Z Z{b{IV Zm| Ho$ C ma Xr{OE : (i) Cg V d H$m Zm_ {b{IE Omo Ho$db ghg `moOr `m {JH$ ~ZmVm h & (ii) Cg V d H$m Zm_ {b{IE {OgH$s g `moOH$Vm VrZ h Am a dh YmVw h & (iii) Cg V d H$m Zm_ {b{IE {OgH$s g `moOH$Vm VrZ h Am a dh AYmVw h & (iv) D Am a E _ o go {H$g V d H$m AmH$ma ~ S>m h Am a `m| ? (v) V d C Am a F {Og n[adma Ho$ gX ` h CgH$m gm_m ` Zm_ `m h ? 31/1 4 F 18 C F H$s 3 Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table : Group 1 2 3 12 13 14 15 16 17 18 Period 2 A B 3 D E C F On the basis of the above table, answer the following questions : (i) (ii) Name the element which is a metal with valency three. (iii) Name the element which is a non-metal with valency three. (iv) Out of D and E, which is bigger in size and why ? (v) 12. Name the element which forms only covalent compounds. Write the common name for the family to which the elements C and F belong. b Zo[a`m _ o nwZ X ^dZ (nwZO ZZ) {H $`m g_PmBE & `h {H $`m OZZ go {H$g H$ma {^ h ? Explain the process of regeneration in Planaria. How is this process different from reproduction ? 13. 3 b go Q>m `m h ? _mZd _mXm _ o BgH$m H$m` {b{IE & 3 What is placenta ? State its function in human female. 14. Cn`w $ CXmhaUm| H$s ghm`Vm go `m `m H$s{OE {H$ Hw$N> bjU AJbr nr T>r H$mo `m| Zht {XE Om gH$Vo h & BZ bjUm| H$mo `m H$hVo h ? 3 With the help of suitable examples, explain why certain traits cannot be passed on to the next generation. What are such traits called ? 15. Eogm hmo gH$Vm h {H$ H$moB bjU d emZwJV hmo OmE, na Vw ` $ Zht hmo & EH$ Cn`w $ 3 CXmhaU H$s ghm`Vm go Bg H$WZ H$s nwp Q> H$s{OE & A trait may be inherited, but may not be expressed. Justify this statement with the help of a suitable example. 16. 31/1 H$moB N>m {H$gr Xn U Ho$ Y wd go _mo_~ mr H$s dmbm H$mo 15 cm X ar na aIH$a CgHo$ {V{~ ~ H$mo 60 cm X ar na p WV nX o na jo{nV H$aZm MmhVm h & (a) Xn U Ho$ Cg H$ma H$m Zm_ {b{IE {Ogo Cgo Cn`moJ H$aZm Mm{hE & (b) ~ZZo dmbo {V{~ ~ H$m a {IH$ AmdY Z kmV H$s{OE & (c) {~ ~ Am a CgHo$ {V{~ ~ Ho$ ~rM H$s X ar {H$VZr h ? (d) Bg H$aU _| {V{~ ~ ~ZZm Xem Zo Ho$ {bE {H$aU AmaoI It{ME & 5 3 P.T.O. A student wants to project the image of a candle flame on a screen 60 cm in front of a mirror by keeping the flame at a distance of 15 cm from its pole. (a) Write the type of mirror he should use. (b) Find the linear magnification of the image produced. (c) What is the distance between the object and its image ? (d) Draw a ray diagram to show the image formation in this case. 17. {Z Z{b{IV `oH$ H$aU _| And{V V {H$aU H$m nW Xem Zo Ho$ {bE {H$aU AmaoI It{ME : H$me H$s H$moB Amn{VV {H$aU {H$gr AdVb b|g Ho$ (i) H$m{eH$ Ho$ go Jw OaVr h & (ii) _w ` Aj Ho$ g_m Va h & (iii) _w ` \$moH$g H$s Amoa {ZX o{eV h & 3 Draw a ray diagram to show the path of the refracted ray in each of the following cases : A ray of light incident on a concave lens is (i) (ii) parallel to its principal axis. (iii) 18. passing through its optical centre. directed towards its principal focus. doV H$me H$m EH$ nVbm {H$aU-nw O ABC _| go Jw OaVm h & PQ {M _| Xem E AZwgma H$m M Ho$ {H$gr { _ Bg {M H$mo AnZr C ma nwp VH$m na It{ME Am a nX o DE na {ZJ V nw O O gm {XImB XoJm CgH$m nW ItMH$a Xem BE & (i) ojU H$s OmZo dmbr n[aKQ>Zm H$m Zm_ Am a CgH$m H$maU {b{IE & (ii) BgHo$ A{V[a $ H ${V _| Bg n[aKQ>Zm H$m Amn Am a H$hm ojU H$aVo h ? (iii) Bg ojU Ho$ AmYma na doV H$me Ho$ Ad`dm| Ho$ ~mao _| Omo {Z H$f {ZH$mbm Om gH$Vm h CgH$m C oI H$s{OE & 31/1 6 3 A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram. Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE. (i) (ii) Where else in nature is this phenomenon observed ? (iii) 19. Write the name and cause of the phenomenon observed. Based on this observation, state the conclusion which can be drawn about the constituents of white light. {H$gr Amhma m Ibm _| D$Om - dmh EH${X{eH$ hmoVm h & Bg H$WZ H$s nw{ > H$s{OE & nr S>H$Zmer {H$gr Amhma m Ibm _| doe H$aHo$ ~mX _| h_mao eara _| H $go nh M OmVo h , g_PmBE & 3 Energy flow in a food chain is unidirectional. Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body. 20. Am`{ZH$ `m {JH$ ~ZmZo dmbo V d AnZo ~m V_ H$moe go Bbo Q >m Z m H$aHo$ AWdm CZH$m mg H$aHo$ C H $ Q> J g {d `mg m H$aVo h & H$maU g{hV g_PmBE {H$ H$m~ Z AnZo `m {JH$mo Ho$ {Z_m U Ho$ g_` Bg T> J go C H $ Q> J g {d `mg `m| m Zht H$a gH$Vm & Am`{ZH$ `m {JH$m| _| ~ZZo dmbo Am~ Y Am a H$m~ Z `m {JH$m| _| ~Zo Am~ Y Ho$ H$mam| Ho$ Zm_ ^r {b{IE & gmW hr BgH$m H$maU ^r {b{IE {H$ H$m~ Z `m {JH$ gm_m `V: {d wV Ho$ Hw$MmbH$ `m| hmoVo h & 5 Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds. Name the type of bonds formed in ionic compounds and in the compounds formed by carbon. Also give reason why carbon compounds are generally poor conductors of electricity. 31/1 7 P.T.O. 21. (a) _mZd _mXm OZZ-V Ho$ H$mQ> ` H$m AmaoI It{ME & Cg ^mJ H$m Zm_m H$Z H$s{OE Ohm (i) A S> {dH${gV hmoVo h & (ii) {ZfoMZ hmoVm h & (iii) {Zfo{MV A S> Amamo{nV hmoVm h & (b) g jon _| CZ n[adV Zm| H$m dU Z H$s{OE Omo J^m e` _| Cg p W{V _ o hmoVo h (i) O~ dh `w _ZO J hU H$aVm h & (ii) O~ `w _ZO Zht ~ZVm & (a) Describe, in brief, the changes the uterus undergoes (i) to receive the zygote. (ii) if zygote is not formed. (a) ZrMo {XE JE {M _| Zm_m {H$V ^mJm| (b) 22. Draw a sectional view of human female reproductive system and label the part where (i) eggs develop. (ii) fertilisation take place. (iii) fertilised egg gets implanted. (b) namJU `m h ? BgHo$ _h d H$m C oI H$s{OE & nw nm| _| {ZfoMZ {H$g H$ma hmoVm h ? nw n Ho$ Cg ^mJ H$m Zm_ {b{IE Omo (i) ~rO _o| {dH${gV hmoVm h , VWm (ii) {ZfoMZ Ho$ n MmV \$b _| {dH${gV hmoVm h & (c) 31/1 5 A, B, C Am a D Ho$ 8 Zm_ {b{IE : 5 (a) (b) (c) 23. Name the parts labelled as A, B, C and D in the diagram given below : What is pollination ? State its significance. How does fertilisation occur in flowers ? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation. (a) Jmobr` b|gm| go g ~ {YV {Z Z{b{IV nXm| H$s `m `m H$s{OE : (i) H$m{eH$ Ho$ (ii) dH $Vm-Ho$ (iii) _w ` Aj (iv) maH$ (v) _w ` \$moH$g (vi) \$moH$g X ar {H$gr A{^gmar b|g H$s \$moH$g X ar 12 cm h & dh {~ ~ X ar n[aH${bV H$s{OE {Og na {H$gr {~ ~ H$mo aIZo na CgH$m n {V{~ ~ b|g Ho$ X gar Amoa b og go 48 cm X a ~ZVm h & (b) (a) 31/1 Explain the following terms related to spherical lenses : (i) optical centre (ii) centres of curvature (iii) principal axis (iv) aperture (v) principal focus (vi) focal length (b) 5 A converging lens has focal length of 12 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 48 cm on the other side of the lens. 9 P.T.O. 24. (a) _mZd Zo Ho$ CZ ^mJm| H$s gyMr ~ZmBE Omo Zo _| doe H$aZo dmbo H$me H$s _m m H$mo {Z` { V H$aVo h & do Bg H$m` H$mo {H$g H$ma H$aVo h , g_PmBE & (b) _mZd Zo _| ao{Q>Zm ( p Q>nQ>b) H$m H$m` {b{IE & (c) `m Amn OmZVo h {H$ H$m {Z `m-A YVm H$m CnMma Zo XmZ mam n m H$m {Z `m Ho$ `mamonU mam {H$`m Om gH$Vm h ? h_| `mo Am a {H$g H$ma g_mO Ho$ gX `m| H$mo _ `w Ho$ n MmV Zo XmZ Ho$ {bE mo gm{hV H$aZo Ho$ {bE g_yhm| H$mo g J{R>V H$aZm Mm{hE ? (a) (b) (c) 1 1 2 1 2 3 List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function. Write the function of retina in human eye. Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye ? How and why should we organise groups to motivate the community members to donate their eyes after death ? ^mJ ~ SECTION B 25. EWoZm BH$ A b Ho$ JwUY_m o H$m A ``Z H$aZo Ho$ {bE EH$ `moJ _| H$moB N>m EH$ ew H$ naIZbr _| bJ^J 3 mL EWoZm BH$ A b boVm h & dh Bg naIZbr _| BVZr hr _m m _| AmgwV Ob {_bmH$a, naIZbr H$mo ^br-^m {V {hbmVm h & Hw$N> g_` n MmV ojU H$aZo na dh N>m nmEJm {H$ (A) naIZbr _| EH$ H$mobm BS> ~Z J`m h & (B) EWoZm BH$ A b Ob _| AmgmZr go Kwb J`m h & (C) {db`Z h H$m Zma Jr hmo J`m h & (D) EWoZm BH$ A b H$s gVh Ho$ D$na Ob V a ahm h & In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time he is likely to observe that (A) (B) the ethanoic acid dissolves readily in water. (C) the solution becomes light orange. (D) 31/1 a colloid is formed in the test tube. water floats over the surface of ethanoic acid. 10 1 26. H$moB N>m EH$ ew H$ naIZbr _| bJ^J 2 mL EWoZm BH$ A b boH$a Cg_| EH$ MwQ>H$s gmo{S>`_ hmBS >moOZ H$m~m oZoQ> {_bmVm h & BgHo$ n MmV dh {Z Z{b{IV ojU ZmoQ> H$aVm h : I. Vwa V hr ~wX~wXmhQ> Ho$ gmW H$moB a JhrZ Am a J YhrZ J g {ZH$bVr h & II. `h J g MyZo Ho$ nmZr _| JwOmao OmZo na Cgo X {Y`m H$a XoVr h & III. ObVr {N>nQ>r H$mo Bg J g Ho$ {ZH$Q> bmZo na `h J g {d \$moQ> Ho$ gmW ObVr h & IV. O~ ObVr {N>nQ>r H$mo Bg J g Ho$ {ZH$Q> bmVo h Vmo dh {N>nQ>r ~wP OmVr h & 1 BZ_| ghr ojU h (A) I, II Am a III (B) II, III Am a IV (C) III, IV Am a I (D) I, II Am a IV A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations : I. Immediately a colourless and odourless gas evolves with a brisk effervescence. II. The gas turns lime water milky when passed through it. III. The gas burns with an explosion when a burning splinter is brought near it. IV. The gas extinguishes the burning splinter that is brought near it. The correct observations are (A) I, II and III (B) II, III and IV (C) III, IV and I (D) I, II and IV 27. 31/1 h_ o gm~wZrH$aU A{^{H $`m H$m A ``Z H$aZo Ho$ {bE 20% Obr` gmo{S>`_ hmBS >m gmBS> {db`Z Mm{hE & O~ h_ R>mog gmo{S>`_ hmBS >m gmBS> H$s ~moVb H$m T> $Z ImobVo h , Vmo h_ Bgo {H$g d $n _| nmVo h ? (A) a JhrZ nmaXeu _{UH$m (~rS>) (B) N>moQ>r doV _{UH$m (~rS>) (C) doV Jw{Q>H$mE /nn{ S>`m (D) doV _hrZ MyU 11 1 P.T.O. We need 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form ? (A) Colourless transparent beads (B) Small white beads (C) White pellets/flakes (D) Fine white powder 28. gm~wZrH$aU A{^{H $`m H$m A ``Z H$aVo g_` H$moB N>m A{^{H $`m {_lU H$m Vmn _mnVm h Am a gmW hr dh Zrbo/bmb {bQ>_g n mam Cg {_lU H$s H ${V ^r kmV H$aVm h & CgHo$ ojUm| Ho$ AmYma na ghr {Z H$f `m hmoJm ? (A) A{^{H $`m D$ _mjonr h Am a A{^{H $`m {_lU A br` h & (B) A{^{H $`m D$ _memofr h Am a A{^{H $`m {_lU A br` h & (C) A{^{H $`m D$ _memofr h Am a A{^{H $`m {_lU jmar` h & (D) A{^{H $`m D$ _mjonr h Am a A{^{H $`m {_lU jmar` h & 1 While studying saponification reaction, a student measures the temperature of the reaction mixture and also finds its nature using blue/red litmus paper. On the basis of his observations the correct conclusion would be (A) the reaction is exothermic and the reaction mixture is acidic. (B) the reaction is endothermic and the reaction mixture is acidic. (C) the reaction is endothermic and the reaction mixture is basic. (D) the reaction is exothermic and the reaction mixture is basic. 29. 31/1 {H$gr ~ Vr _| `moJ H$aZo Ho$ {bE Amd `H$ H$R>moa Ob Cnb Y Zht h & na Vw Hy$b H$s `moJembm _| {Z Z{b{IV bdU Cnb Y h : 1. gmo{S>`_ g \o$Q> 2. H $p g`_ g \o$Q 3. _ Zr{e`_ bmoamBS> 4. gmo{S>`_ bmoamBS> 5. H $p g`_ bmoamBS> 6. nmoQ> {e`_ g \o$Q> `moJ Ho$ {bE H$R>moa Ob m H$aZo Ho$ {bE Ob _| Cn`w $ bdUm| _| go {H$ h o Kmobm Om gH$Vm h ? (A) 2, 3 Am a 5 (B) 1, 2 Am a 5 (C) 1, 2, 4 Am a 6 (D) Ho$db 3 Am a 5 12 1 In a locality, hard water, required for an experiment, is not available. However, the following salts are available in the school laboratory : 1. Sodium sulphate 2. Calcium sulphate 3. Magnesium chloride 4. Sodium chloride 5. Calcium chloride 6. Potassium sulphate Which of the above salts may be dissolved in water to obtain hard water for the experiment ? (A) 2, 3 and 5 (B) 1, 2 and 5 (C) 1, 2, 4 and 6 (D) 3 and 5 only 30. {H$gr N>m Zo {XE JE F1 \$moH$g X ar Ho$ Jmobr` Xn m Ho$ Cn`moJ mam {H$gr ^br-^m {V Xr X a W {~ ~ H$m {V{~ ~ nX o na \$moH${gV {H$`m & BgHo$ n MmV {ejH$ Zo Cgo F2 \$moH$g X ar H$m H$moB A ` Xn U XoH$a Cgr {~ ~ H$mo Cgr nX} na \$moH${gV H$aZo Ho$ {bE H$hm & Cg N>m Zo `h nm`m {H$ Cgr {~ ~ H$mo X gao Xn U go \$moH${gV H$aZo Ho$ {bE Cgo Xn U H$mo nX} go X a hQ>mZm n S>m & CgHo$ Bg ojU go `h {Z H$f {ZH$mbm Om gH$Vm h {H$ Cgo {XE JE XmoZm| Jmobr` Xn U (ghr {dH$ n Mw{ZE) (A) AdVb Wo VWm F1 < F2 (B) AdVb Wo VWm F1 > F2 (C) C mb Wo VWm F1 < F2 (D) C mb Wo VWm F1 > F2 1 A student has obtained an image of a well-illuminated distant object on a screen to determine the focal length, F1 of the given spherical mirror. The teacher then gave him another mirror of focal length, F2 and asked him to obtain a focussed image of the same object on the same screen. The student found that in order to focus the same object using the second mirror, he has to move the mirror away from the screen. From this observation it may be concluded that both the spherical mirrors given to the student were (select the correct option) (A) Concave and F1 < F2 (B) (C) Convex and F1 < F2 (D) 31/1 Concave and F1 > F2 Convex and F1 > F2 13 P.T.O. 31. {H$gr N>m Zo ZrMo {M _| Xem E AZwgma H$m{eH$ `w{ $ [H$aUm| H$mo nX o S na \$moH${gV {H$`m & Bggo `h {Z H$f {ZH$mbm Om gH$Vm h {H$ `w{ $ X (A) 10 cm \$moH$g 20 cm dH $Vm 20 cm \$moH$g X ar H$m C mb b|g h & (D) 20 cm \$moH$g (ghr {dH$ n Mw{ZE) { `m H$m C mb b|g h & (C) H$m Cn`moJ H$aHo$ gy` H$s X ar H$m C mb b|g h & (B) X X ar H$m AdVb Xn U h & A student focussed the Sun rays using an optical device X on a screen S as shown. From this it may be concluded that the device X is a (select the correct option) (A) (B) Convex lens of radius of curvature 20 cm. (C) Convex lens of focal length 20 cm. (D) 31/1 Convex lens of focal length 10 cm. Concave mirror of focal length 20 cm. 14 1 32. Mma {^ _mZ dmbo AmnVZ H$moU H$s H$me {H$aUm| H$m, H$m M H$s Am`VmH$ma {g r go hmoH$a Jw OaZo na, nW H$m AmboIZ H$aZo Ho$ n MmV , {H$gr N>m Zo AnZo ojUm| H$mo gmaUr Ho$ $n _| {Z Z H$ma Xem `m : H $_ g `m i r e I 30 19 29 II 40 28 40 III 50 36 50 IV 60 40 59 1 BZ_| gdm o m_ ojU h (A) I (B) II (C) III (D) IV After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below : S. No. i r e I 30 19 29 II 40 28 40 III 50 36 50 IV 60 40 59 The best observation is (A) (B) II (C) III (D) 31/1 I IV 15 P.T.O. 33. H$moB N>m H$m M H$s Am`VmH$ma {g r go hmoH$a Jw OaZo dmbr H$me {H$aU H$m nW Ambo{IV H$a Cg na ZrMo {XE AZwgma AmnVZ H$moU i, AndV Z H$moU r VWm {ZJ V H$moU e A {H$V H$aVm h & BZ_| go ghr A {H$V H$moU h /h (A) Ho$db i (B) Ho$db e (C) Ho$db r (D) i Am a e 1 A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of emergence e, as shown. The correctly marked angle(s) is/are (A) i only (B) e only (C) r only (D) i and e 31/1 16 34. {Z Z{b{IV {M m o H$mo A ``Z H$s{OE {OZ_| Mma N>m m| P, Q, R Am a S mam {H$gr H$m M Ho$ { _ go hmoH$a Jw OaZo dmbr H$me {H$aU Ho$ Ambo{IV nW Xem E JE h : 1 ghr nW Ambo{IV H$aZo dmbm N>m h (A) P (B) Q (C) R (D) S Study the following diagrams in which the path of a ray of light passing through a glass prism as traced by four students P, Q, R and S is shown : The student who has traced the path correctly is (A) (B) Q (C) R (D) 31/1 P S 17 P.T.O. 35. {Z Z{b{IV AmaoI _| H$m M Ho$ { _ go hmoH$a Jw OaZo dmbr {H$gr H$me {H$aU H$m nW Xem `m J`m h : Bg AmaoI _| AmnVZ H$moU, {ZJ V H$moU VWm {dMbZ H$moU H $_e: {H$Z Ajam| mam {Z ${nV {H$E JE h ? (ghr {dH$ n Mw{ZE) (A) X, R Am a T (B) Y, Q Am a T (C) X, Q Am a P (D) Y, Q Am a P In the following diagram, the path of a ray of light passing through a glass prism is shown : In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option) : (A) (B) Y, Q and T (C) X, Q and P (D) 31/1 X, R and T Y, Q and P 18 1 36. H$moB N>m 10 cm \$moH$g X ar Ho$ C mb b|g H$m Cn`moJ H$aHo$ {~ ~ H$s {d{^ X [a`m| Ho$ {bE C mb b|g mam ~ZZo dmbo {V{~ ~m| H$m A ``Z H$a ahm h & {H$gr EH$ ojU _| dh `h nm gH$Vm h {H$ O~ {~ ~ b|g go 20 cm X ar na aIm h , Vmo CgH$m {V{~ ~ ~ZVm h (ghr {dH$ n Mw{ZE) (A) b|g Ho$ X gar Amoa h & 20 cm X ar na Am a `h g_mZ AmH$ma H$m, dm V{dH$ Am a grYm (B) b|g Ho$ X gar Amoa 40 cm X ar na Am a `h Amd{Y V, dm V{dH$ Am a C Q>m h & (C) b|g Ho$ X gar Amoa h & 20 cm X ar na Am a `h g_mZ AmH$ma H$m, dm V{dH$ Am a C Q>m (D) b|g Ho$ X gar Amoa h & 20 cm 1 X ar na Am a `h g_mZ AmH$ma H$m, Am^mgr Am a grYm A student is using a convex lens of focal length 10 cm to study the image formation by a convex lens for the various positions of the object. In one of his observations, he may observe that when the object is placed at a distance of 20 cm from the lens, its image is formed at (select the correct option) (A) 20 cm on the other side of the lens and is of the same size, real and erect. (B) 40 cm on the other side of the lens and is magnified, real and inverted. (C) 20 cm on the other side of the lens and is of the same size, real and inverted. (D) 20 cm on the other side of the lens and is of the same size, virtual and erect. 31/1 19 P.T.O. 37. H$moB N>m 18 cm \$moH$g X ar Ho$ C mb b og H$m Cn`moJ, b|g go {~ ~ H$s {d{^ X [a`m| Ho$ {V{~ ~ ~ZZo H$m A ``Z H$a ahm h & dh ojU H$aVm h {H$ O~ dh {~ ~ H$mo b|g go 27 cm X ar na aIVm h , Vmo {V{~ ~ b og Ho$ X gar Amoa 54 cm X ar na ~ZVm h & {Z Z{b{IV AmaoI _| go CZ VrZ {H$aUm o H$mo Mw{ZE Omo H$me Ho$ AndV Z Ho$ {Z`_m| H$m nmbZ H$aVr h Am a {OZH$m Cn`moJ g JV {H$aU AmaoI ItMZo Ho$ {bE [H$`m Om gH$Vm h & (A) 1, 2 Am a 4 (B) 1, 3 Am a 5 (C) 2, 4 Am a 5 (D) 2, 3 Am a 4 A student is using a convex lens of focal length 18 cm to study the image formation by it for the various positions of the object. He observes that when he places the object at 27 cm, the location of the image is at 54 cm on the other side of the lens. Identify from the following diagram the three rays that are obeying the laws of refraction and may be used to draw the corresponding ray diagram. (A) (B) 1, 3 and 5 (C) 2, 4 and 5 (D) 31/1 1, 2 and 4 2, 3 and 4 20 1 38. {H$gr N>m H$mo A_r~m _| [ I S>Z Ho$ {d{^ MaUm| H$mo Xem Zo dmbr V `ma bmBS> H$mo AnZo g `w $ gy _Xeu _| \$moH${gV H$aZm h & BgHo$ {bE Cgo {OZ g ^d MaUmo H$m nmbZ H$aZm h do A `dp WV H $_ _| ZrMo {XE JE h : I. gy _Xeu Ho$ S>m`m\ $m_ Am a Xn U H$mo Bg H$ma g_m`mo{OV H$s{OE {H$ bmBS> H$mo Xr H$aZo Ho$ {bE n`m H$me doe H$a gHo$ & II. _ M ( Q>oO) na bmBS> H$mo gmdYmZrnyd H$ bJmBE & III. gy _Xeu H$mo C e{ $ na g_m`mo{OV H$aHo$ \$moH${gV H$s{OE & IV. gy _Xeu H$mo {Z Z e{ $ na g_m`mo{OV H$aHo$ \$moH${gV H$s{OE & 1 gy _Xer _| bmBS> Ho$ ojU Ho$ {bE Cn`w $ MaUm| H$m ghr H $_ h (A) I, II, IV, III (B) II, I, IV, III (C) II, IV, I, III (D) I, IV, II, III A student has to focus his compound microscope to observe a prepared slide showing different stages of binary fission in Amoeba. The steps he is likely to follow are listed below in a haphazard manner : I. Adjust the diaphragm and the mirror of the microscope so that sufficient light may enter to illuminate the slide. II. Fix the slide on the stage carefully. III. Adjust the microscope to high power and focus. IV. Adjust the microscope to low power and focus. The correct sequence of the above steps to observe the slide under the microscope is (A) (B) II, I, IV, III (C) II, IV, I, III (D) 31/1 I, II, IV, III I, IV, II, III 21 P.T.O. 39. O~ Amn `r Q> _| _wHw$bZ Ho$ {d{^ MaUm| H$mo Xem Vr h B bmBS> H$m A ``Z H$aVo h , Vmo Cg g_` Amn {Z Z{b{IV MaUm| H$m ojU H$aVo h : I. _wHw$b OZH$ H$m` go n WH $ hmo ahm h Am a Z`r `p Q> _| {dH${gV hmo ahm h & II. _wHw$b H$m` {dH${gV hmoVr h Am a Cggo A ` {eew _wHw$b H$m CX J_ hmoVm h & III. OZH$ H$mo{eH$m H$s H$m` go {H$gr ^r {Xem _| _wHw$b ~mha AmVm h & IV. Bg H$ma `o EH$ H$m bmoZr (_ S>b) ~Zm boVo h & 1 Cn`w $ MaUm| H$m ghr H $_ h (A) II, I, III, IV (B) II, III, I, IV (C) III, II, I, IV (D) III, I, II, IV When you study a slide showing different stages of budding in yeast, you observe the following stages : I. The bud may get separated from the parent body and develop into a new individual. II. The body of the bud develops and gives rise to another baby bud. III. A bud comes out in any direction from the body of the parent cell. IV. Thus they may form a colony. The proper sequence of the above stages is (A) (B) II, III, I, IV (C) III, II, I, IV (D) 31/1 II, I, III, IV III, I, II, IV 22 40. {Z Z{b{IV H$WZm| H$m A ``Z H$s{OE : I. njr Ho$ n I Am a M_JmX S> Ho$ n I g_OmV A J h & II. njr Ho$ n I Am a H$sQ>m| Ho$ n I $nm V[aV AJ nmX h & III. njr Ho$ n I Am a H$sQ>m| Ho$ n I g_d { m A J h & IV. njr Ho$ n I Am a Kmo S>o Ho$ AJ nmX g_OmV A J h & 1 BZ_| ghr H$WZ h (A) I Am a II (B) II Am a III (C) III Am a IV (D) I Am a IV Study the following statements : I. Wings of birds and wings of bats are homologous organs. II. Wings of birds and wings of insects are modified forelimbs. III. Wings of birds and wings of insects are analogous organs. IV. Wings of birds and forelimbs of horse are homologous organs. The correct statements are (A) (B) II and III (C) III and IV (D) 41. I and II I and IV {Z Z{b{IV Xmo gp O`m| H$m H$m Z-gm Omo S>m g_OmV g aMZmAm| H$m ghr {Z $nU H$aVm h (A) eH$aH $Xr Am a Amby (B) eH$aH $Xr Am a Q>_mQ>a (C) JmOa Am a Amby (D) _ybr Am a JmOa ? 1 Which of the following pairs of two vegetables represents the correct homologous structures ? (A) (B) (C) (D) 31/1 Sweet potato and potato Sweet potato and tomato Carrot and potato Radish and carrot 23 P.T.O. 42. {Z Z{b{IV {H$gr [ ~rOn r ~rO Ho$ ^ yU H$s g aMZm Ho$ AmaoI _| BgHo$ A {H$V ^mJ Am a III H $_dma `m h ? (A) m Hw$a, ~rOn , _ybm Hw$a (B) m Hw$a, _ybm Hw$a, ~rOn (C) ~rOn , m Hw$a, _ybm Hw$a (D) I, II _ybm Hw$a, m Hw$a, ~rOn In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially ? (A) (B) Plumule, Radicle, Cotyledon (C) Cotyledon, Plumule, Radicle (D) 31/1 Plumule, Cotyledon, Radicle Radicle, Plumule, Cotyledon 24 1

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Additional Info : Solved CBSE Class 10 Board exam paper study guide - CBSE 2014 :SCIENCE - C.B.S.E. Free Online Question Paper
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