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Class 10 CBSE Board 2016 : Science (International Indian School, Jeddah)

16 pages, 4 questions, 2 questions with responses, 2 total responses,

	Faria Saleem Osmania University, Hyderabad, Jeddah	+Fave Message
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SET-1 H$moS> Z . Series RLH/2 Code No. amob Z . 31/2/1 narjmWu H$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 > 16 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 _| >36 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 16 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 36 questions. Please write down the Serial Number of the question before attempting it. 15 minute 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 31/2/1 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) nyao Z-n _| {H$gr Z _| H$moB M`Z m Zht h & (iv) AmnH$mo ^mJ A Am a ^mJ ~ Ho$ g^r Zm| Ho$ C ma n WH $-n WH $ ^mJ Ho$ AmYma na {bIZo h & (v) ^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| & (vi) ^mJ A Ho$ Z g `m 4 go 6 Ho$ Z Xmo-Xmo A H$m| Ho$ h & BZHo$ C ma bJ^J 30 e Xm| _| XoZo h & (vii) ^mJ A Ho$ Z g `m 7 go 18 Ho$ Z VrZ-VrZ A H$m| Ho$ h & BZHo$ C ma bJ^J 50 e Xm| _| XoZo h & (viii) ^mJ A Ho$ Z g `m 19 go 24 Ho$ Z nm M-nm M A H$m| Ho$ h & BZHo$ C ma bJ^J 70 e Xm| _| XoZo h & (ix) ^mJ ~ Ho$ Z g `m 25 go 33 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 & (x) ^mJ ~ Ho$ Z g `m 34 go 36 Ho$ Z `moJm _H$ H$m eb na AmYm[aV Xmo-Xmo A H$m| Ho$ Z h & BZHo$ C ma g {j _| XoZo h & General Instructions : (i) The question paper comprises two sections, A and B. You are to attempt both the sections. (ii) All questions are compulsory. (iii) There is no choice in any of the questions. (iv) All questions of Section A and all questions of Section B are to be attempted separately. (v) Question numbers 1 to 3 in Section A are one mark questions. These are to be answered in one word or in one sentence. (vi) Question numbers 4 to 6 in Section A are two marks questions. These are to be answered in about 30 words each. 31/2/1 2 (vii) Question numbers 7 to 18 in Section A are three marks questions. These are to be answered in about 50 words each. (viii) Question numbers 19 to 24 in Section A are five marks questions. These are to be answered in about 70 words each. (ix) Question numbers 25 to 33 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. (x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief. ^mJ A SECTION A 1. Cg {H $`m H$m Zm_ {b{IE {OgHo$ mam Ag V V dgmAm| H$mo g V V dgmAm| _| n[ad{V V {H$`m OmVm h & 1 Name the process by which unsaturated fats are changed to saturated fats. 2. H$mbm Oma amoJ Ho$ H$maH$ amoJmUw VWm BgH$s Ab {JH$ OZZ H$s {d{Y H$m Zm_ {b{IE & 1 Name the causative agent of the disease Kala-azar and its mode of asexual reproduction. 3. {Z Z{b{IV Ord H$moB Amhma m Ibm ~ZmVo h & BZ_| go {H$g Ord _| AO d-{Z ZrH$aUr` agm`Zm| H$s gdm {YH$ gm Vm hmoJr ? Bggo g ~p YV n[aKQ>Zm H$m Zm_ ^r {b{IE & 1 H$sQ>, ~m O, Kmg, gm n, _|T>H$ & The following organisms form a food chain. Which of these will have the highest concentration of non-biodegradable chemicals ? Name the phenomenon associated with it. Insects, Hawk, Grass, Snake, Frog. 4. Vmao {Q>_{Q>_mVo `m| VrV hmoVo h ? n > H$s{OE & 2 Why do stars appear to twinkle ? Explain. 31/2/1 3 P.T.O. 5. n`m daU H$mo ~MmZo Ho$ {bE VrZ H$ma Ho$ R (3-R s) go `m Vm n` h ? CXmhaUm| g{hV n > H$s{OE {H$ n`m daU H$mo ~MmZo Ho$ {bE Amn AnZo {d mb` _| BZ VrZ-R H$m nmbZ {H$g H$ma H$a|Jo & 2 What is meant by three types of R (3-R s) to save the environment ? Explain with examples how would you follow the 3-R s in your school to save the environment. 6. Ob Ho$ ^m _ Ob Ho$ $n _o| g M`Z Ho$ Mma bm^m| H$s gyMr ~ZmBE & 2 List four advantages of water stored in the ground as ground water . 7. {Z Z{b{IV `m {JH$m| Ho$ Amp dH$ gy {b{IE Am a BZH$s Bbo Q >m Z-{~ X g aMZmE Xem BE : (i) EWoZ (ii) EWrZ (iii) EWmBZ 3 Write the molecular formula of the following compounds and draw their electron-dot structures : (i) (ii) Ethene (iii) 8. Ethane Ethyne H$m~ {ZH$ `m {JH$m| Ho$ H$m`m _H$ g_yh go `m Vm n` h ? {Z Z{b{IV `m {JH$m| Ho$ g aMZm _H$ gy Am a CZHo$ H$m`m _H$ g_yh H$mo Vm{bH$m Ho$ $n _| {b{IE : (i) 3 EWoZm b EWoZm BH$ A b (ii) What is meant by functional group in carbon compounds ? Write in tabular form the structural formula and the functional group present in the following compounds : (i) (ii) 9. 31/2/1 Ethanol Ethanoic acid V dm| Ho$ dJuH$aU H$m _wI C o ` {b{IE & V dm| Ho$ Cg AmYma^yV JwUY_ H$m Zm_ {b{IE {OgH$m Cn`moJ AmYw{ZH$ AmdV gmaUr H$mo {dH${gV H$aZo _| {H$`m J`m h & AmYw{ZH$ AmdV {Z`_ ~VmBE & AmYw{ZH$ AmdV gmaUr Ho$ H$m Z-go ^mJ _| Amn YmVwAm|, CnYmVwAm| Am a AYmVwAm| H$mo nmE Jo ? 4 3 Write the main aim of classifying elements. Name the basic property of elements used in the development of Modern Periodic Table. State the Modern Periodic Law. On which side (part) of the Modern Periodic Table do you find metals, metalloids and non-metals ? 10. {H$gr V d X H$m na_mUw H $_m H$ 20 h & (i) V d X H$s AmdV gmaUr _| p W{V {ZYm [aV H$s{OE & (ii) V d X H$s V d Y (na_mUw H $_m H$ 8) go A{^{H $`m/g `moJ mam ~Zo `m {JH$ H$m gy {b{IE & (iii) Bg H$ma ~Zo `m {JH$ H$s H ${V A br` hmoJr AWdm jmar` ? AmnHo$ C ma H$s nw{ > H$s{OE & 3 The atomic number of an element X is 20. (i) Determine the position of the element X in the periodic table. (ii) Write the formula of the compound formed when X reacts/combines with another element Y (atomic number 8). (iii) What would be the nature (acidic or basic) of the compound formed ? Justify your answer. 11. Ab {JH$ OZZ Am a b {JH$ OZZ Ho$ ~rM EH$ _wI A Va {b{IE & b {JH$ OZZ H$aZo dmbr AWdm Ab {JH$ OZZ H$aZo dmbr nrer O _| go {H$gHo$ mam O{ZV nrer O H$s C maOr{dVm Ho$ AnojmH $V Am a A{YH$ A N>o g `moJ hmo gH$Vo h ? AnZo C ma H$s nw{ > H$s{OE & 3 Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival the one reproducing asexually or the one reproducing sexually ? Justify your answer. 12. b Zo[a`m _| nwZ X ^dZ (nwZO ZZ) H$s {H $`m H$mo n > H$s{OE & `h {H $`m OZZ go {H$g H$ma {^ h ? 3 Explain the process of regeneration in Planaria. How is this process different from reproduction ? 13. b go Q>m `m h ? _mZdm| _| BgHo$ H$m` H$s `m `m H$s{OE & 3 What is placenta ? Explain its function in humans. 14. {H$gr `wJb Ho$ {eew H$m Za AWdm _mXm hmoZm _m g `moJ h & EH$ dmh AmaoI ItMH$a Bg H$WZ H$s nw{ > H$s{OE & 3 It is a matter of chance whether a couple will have a male or a female child. Justify this statement by drawing a flow chart. 31/2/1 5 P.T.O. 15. Eogm g ^d h {H$ H$moB bjU d emZwJV Vmo hmo OmE na Vw ` $ Z hmo nmE & Bg H$WZ H$s nw{ > EH$ Cn`w $ CXmhaU XoH$a H$s{OE & 3 It is possible that a trait is inherited but may not be expressed. Give a suitable example to justify this statement. 16. {Z Z{b{IV `oH$ H$aU _| namd{V V {H$aU H$m nW X mm Zo Ho$ {bE EH$ {H$aU AmaoI It{ME & H$me H$s H$moB {H$aU {H$gr C mb Xn U Ho$ (a) Y wd na Xn U Ho$ _w ` Aj go H$moU na Amn{VV h & (b) _w ` \$moH$g H$s Amoa {ZX}{eV h & (c) _w ` Aj Ho$ g_m Va h & 3 Draw a ray diagram to show the path of the reflected ray in each of the following cases. A ray of light incident on a convex mirror (a) (b) is directed towards its principal focus. (c) 17. strikes at its pole making an angle from the principal axis. is parallel to its principal axis. A{J _ gy`m}X` VWm {db {~V gy`m V go `m Vm n` h AmaoI ItMH$a n > H$s{OE & ? BZ n[aKQ>ZmAm| H$mo Zm_m {H$V 3 What is meant by advance sunrise and delayed sunset ? Draw a labelled diagram to explain these phenomena. 18. Amo OmoZ `m h ? `h dm`w_ S>b _o {H$g H$ma Am a H$hm ~ZVr h {H$gr nm[aV H$mo {H$g H$ma ^m{dV H$aVr h & ? n > H$s{OE H$s `h 3 What is ozone ? How and where is it formed in the atmosphere ? Explain how does it affect an ecosystem. 19. Am`{ZH$ `m {JH$ ~ZmZo dmbo V d AnZo$ g `moOH$Vm H$moe go Bbo Q >m Z m V H$aHo$ AWdm CZH$m mg H$aHo$ C H $ > J g Bbo Q >m {ZH$ {d `mg m V H$aVo h & H$maU XoVo h E n > H$s{OE {H$ H$m~ Z AnZo `m {JH$m| Ho$ {Z_m U _| Bg H$ma H$m {d `mg Bg {d{Y go `m| Zht m V 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_ {b{IE & H$maU g{hV `h ^r n > H$s{OE {H$ H$m~ Z `m {JH$ gm_m `V {d wV Ho$ Hw$MmbH$ `m| hmoVo h & Elements forming ionic compounds attain noble gas electronic configuration by either gaining or losing electrons from their valence shells. Explain giving reason why carbon cannot attain such a 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 explain with reason why carbon compounds are generally poor conductors of electricity. 31/2/1 6 5 20. (a) {XE JE AmaoI _| (b) namJU {H$go H$hVo h ? BgH$m _h d g_PmBE & nw nm| _| {ZfoMZ H$s {H $`m g_PmBE & nw n Ho$ Cg ^mJ H$m Zm_ {b{IE Omo {ZfoMZ Ho$ n MmV (i) ~rO _| {dH${gV hmoVm h , (ii) \$b _| {dH${gV hmo OmVm h & (c) A, B, C Am a D H$mo nhMm{ZE Am a CZHo$ Zm_ {b{IE & (a) Identify A, B, C and D in the given diagram and write their names. (b) What is pollination ? Explain its significance. (c) Explain the process of fertilisation in flowers. Name the parts of the flower that develop after fertilisation into (i) seed, (ii) 31/2/1 5 fruit. 7 P.T.O. 21. Om{V-CX ^d `m h ? Om{V-CX ^d _| ghm`H$ Mma H$maH$m| H$s gyMr ~ZmBE & BZ H$maH$m| _| go H$m Z-gm dnam{JV nrer O Ho$ nm Ym| Ho$ Om{V-CX ^d H$m _wI H$maH$ Zht hmo gH$Vm ? n > H$s{OE & 5 What is speciation ? List four factors that could lead to speciation. Which of these cannot be a major factor in the speciation of a self-pollinating plant species ? Explain. 22. H$moB N>m AdVb Xn U mam _mo_~ mr H$s dmbm H$m {V{~ ~ doV nX} na \$moH${gV H$aVm h & n[ap W{V ZrMo {XE JE AZwgma h : dmbm H$s b ~mB = 1.5 cm Xn U H$s \$moH$g X ar = 12 cm dmbm H$s Xn U go X ar = 18 cm `{X dmbm Xn U Ho$ _w ` Aj Ho$ b ~dV h , Vmo {Z Z{b{IV H$m n[aH$bZ H$s{OE (a) {V{~ ~ H$s Xn U go X ar (b) {V{~ ~ H$s b ~mB : `{X dmbm H$s Xn U go X ar 10 cm H$a Xr OmE, Vmo nX} na `m {XImB XoJm ? AnZo C ma H$s nw{ > Bg n[ap W{V Ho$ {bE {H$aU AmaoI ItMH$a H$s{OE & A student has focused the image of a candle flame on a white screen using a concave mirror. The situation is as given below : Length of the flame = 1 5 cm Focal length of the mirror = 12 cm Distance of flame from the mirror = 18 cm If the flame is perpendicular to the principal axis of the mirror, then calculate the following : (a) Distance of the image from the mirror (b) Length of the image If the distance between the mirror and the flame is reduced to 10 cm, then what would be observed on the screen ? Draw ray diagram to justify your answer for this situation. 31/2/1 8 5 23. {H$gr b|g H$s j_Vm go `m Vm n` h ? BgH$m Eg.AmB . (S.I.) _m H$ `m h ? {H$g H$ma Ho$ b|g H$s j_Vm YZm _H$ hmoVr h ? H$moB b|g {H$gr {~ ~ H$m dm V{dH$, C Q>m Am a g_mZ AmH$ma (gmB O) H$m {V{~ ~ b|g go 40 cm X ar na ~ZmVm h & b|g H$s H ${V Am a j_Vm `m h ? AnZo C ma H$s nw{ > Ho$ {bE {H$aU AmaoI It{ME & 5 What is meant by the power of a lens ? What is its S.I. unit ? Name the type of lens whose power is positive. The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens ? Draw ray diagram to justify your answer. 24. _mZd Zo Ho$ {Z Z{b{IV `oH$ ^mJ H$m H$m` {b{IE : (i) H$m {Z `m (ii) n[aVm[aH$m (iii) nwVbr (iv) ao{Q>Zm {dH$mgerb Xoem| Ho$ H$amo S>m| `{ $ H$m {Z `m A YVm go nr{ S>V h & Bg amoJ H$mo Zo XmZ mam m V H$m {Z `m Ho$ `mamonU go R>rH$ {H$`m Om gH$Vm h & AmnH$m {d mb` Bg V ` Ho$ ~mao _| OmJ $H$Vm C n H$aZo Am a _ `w Ho$ n MmV bmoJm| H$mo Zo XmZ Ho$ {bE o[aV H$aZo Ho$ C o ` go {d mb` Am a CgHo$ n S>mog _| A{^`mZ Mbm ahm h & Amn AmnHo$ ghnm{R>`m| Ho$ gmW {_bH$a Bg nw ` H$m` _| {H$g H$ma `moJXmZ H$a gH$Vo h ? {d mb`m| mam Bg H$ma Ho$ A{^`mZm| Ho$ MbmZo Ho$ C o ` {b{IE & 5 State the function of each of the following parts of the human eye : (i) Cornea (ii) Iris (iii) Pupil (iv) Retina Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause ? State the objectives of organising such campaigns in schools. 31/2/1 9 P.T.O. ^mJ ~ SECTION B 25. H$moB N>m Eogr{Q>H$ A b H$s EH$ ~y X nhbo Zrbo {bQ>_g n na Am a {\$a bmb {bQ>_g n na S>mbVm h & dh `h ojU H$aoJm {H$ (A) bmb {bQ>_g n a JhrZ hmo OmVm h Am a Zrbo {bQ>_g n _| H$moB n[adV Z Zht hmoVm & (B) bmb {bQ>_g n Zrbm hmo OmVm h Am a Zrbm {bQ>_g n bmb hmo OmVm h & (C) bmb {bQ>_g n _| H$moB n[adV Z Zht hmoVm Am a Zrbm {bQ>_g n bmb hmo OmVm h & (D) Zrbo {bQ>_g n _| H$moB n[adV Z Zht hmoVm Am a bmb {bQ>_g n Zrbm hmo OmVm h & 1 A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe that (A) (B) there is no change in the red litmus paper and the blue litmus paper turns red. (D) 31/2/1 the red litmus paper turns blue and the blue litmus paper turns red. (C) 26. the red litmus paper turns colourless and there is no change in the blue litmus paper. there is no change in the blue litmus paper and the red litmus paper turns blue. gm~wZrH$aU A{^{H $`mAm| H$m A ``Z H$aVo g_` N>m m| mam ZmoQ> H$s JB Hw$N> {Q> n{U`m ZrMo Xr JB h : (I) gm~wZ dgr` A bm| H$m bdU h & (II) A{^{H $`m {_lU H$s jmar` H ${V h & (III) Bg A{^{H $`m _| D$ _m H$m AdemofU hmoVm h & (IV) `h A{^{H $`m CXmgrZrH$aU A{^{H $`m Zht h & BZ_| go ghr {Q> n{U`m H$m Z-gr h ? (A) Ho$db I Am a III (B) I, II Am a III (C) II, III Am a IV (D) Ho$db I Am a II 10 1 While studying saponification reactions, the following comments were noted down by the students : (I) Soap is a salt of fatty acids. (II) The reaction mixture is basic in nature. (III) In this reaction heat is absorbed. (IV) This reaction is not a neutralisation reaction. Which of these are the correct comments ? (A) (B) I, II and III (C) II, III and IV (D) 27. I and III only I and II only H$moB N>m Mma naIZ{b`m| I, II, III Am a IV _|, `oH$ _| 4 mL AmgwV Ob boH$a CZ_| Mma {^ bdU naIZbr I _| NaCl, naIZbr II _| CaCl2, naIZbr III _| MgCl2 Am a naIZbr IV _| KCl H$s g_mZ _m m KmobVm h & BgHo$ n MmV dh `oH$ naIZbr _| {XE JE gm~wZ Ho$ Kmob H$s 8 ~y X {_bmH$a naIZbr H$s gm_J r H$mo 10 ~ma {hbmVm h & {H$Z naIZ{b`m| _| ^anya PmJ ~ZoJm ? (A) I d II (B) II d III (C) I d IV (D) III d IV 1 A student takes 4 mL of distilled water in each of four test tubes I, II, III and IV, and then dissolves an equal amount of four different salts namely NaCl in I, CaCl2 in II, MgCl2 in III and KCl in IV. He then adds 8 drops of the given soap solution to each test tube and shakes the contents of the test tube 10 times. In which test tubes will enough lather (foam) be formed ? (A) (B) II and III (C) I and IV (D) 31/2/1 I and II III and IV 11 P.T.O. 28. {H$gr N>m go _Q>a Ho$ ~rO Ho$ ^ yU Ho$ {d{^ ^mJm| H$m A ``Z H$aZo Ho$ {bE H$hm J`m & Bg `moJ Ho$ Amd `H$ MaU ZrMo {XE JE h : 1 (I) _Q>a Ho$ ~rOm| H$mo {dew Ob _| {^JmoH$a EH$ amV VH$ ^rJm ahZo Xr{OE & (II) ^rJo ~rO H$mo H$m{Q>E Am a BgHo$ {d{^ ^mJm| H$m ojU H$s{OE & (III) EH$ noQ >r {S>e _| Hw$N> _Q>a Ho$ ~rO br{OE & (IV) A{V[a $ Ob H$mo {ZH$mb Xr{OE & ~rOm| H$mo Jrbo gyVr H$n S>o go T>H$ H$a EH$ {XZ Ho$ {bE Eogo hr N>mo S> Xr{OE & BZ MaUm| H$m ghr H $_ h (A) III, I, IV, II (B) III, IV, I, II (C) III, I, II, IV (D) III, II, I, IV A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment : (I) Soak the pea seeds in plain water and keep them overnight. (II) Cut open the soaked seed and observe its different parts. (III) Take some pea seeds in a petri dish. (IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day. The correct sequence of these steps is (A) (B) III, I, II, IV (D) 31/2/1 III, IV, I, II (C) 29. III, I, IV, II III, II, I, IV >{H$gr H$jm _|, N>m m| H$mo {d{^ Ordm| Ho$ AJ nmX Ed n Im| Ho$ H $H$mbm| Ho$ _m S>bm|/ bmBS>m|/{M m| H$m ojU H$am`m J`m & ojU Ho$ n MmV N>m m| Zo g_OmV g aMZmAm| Ho$ {Z Z{b{IV g_yh ~ZmE & ghr g_yh H$mo Mw{ZE : (A) njr VWm {VVbr Ho$ n I (B) H$~yVa Am a M_JmX S> Ho$ n I (C) {VVbr Am a M_JmX S> Ho$ n I (D) Jm`, ~V VWm {N>nH$br Ho$ AJ nmX 12 1 In a class, students were asked to observe the models/slides/pictures of the skeletons of forelimbs and wings of different organisms. After the observations the students made the following groups of homologous structures. Select the correct group : (A) (B) Wings of a pigeon and a bat (C) Wings of a butterfly and a bat (D) 30. Wings of a bird and a butterfly Forelimbs of a cow, a duck and a lizard {H$gr N>m Zo AdVb Xn U mam `moJembm Ho$ X a W {gao na aIr _mo_~ mr H$s dmbm H$m Vr U {V{~ ~ nX} na m V {H$`m & {ejH$ Zo Xn U H$s \$moH$g X ar H$m Am a A{YH$ {ZH$Q>V_ _mZ m V H$aZo Ho$ {bE Cgo gy` Ho$ {V{~ ~ H$mo nX} na \$moH${gV H$aZo H$m gwPmd {X`m & Cg N>m H$mo `m H$aZm Mm{hE ? (A) (B) (C) (D) 1 Xn U H$mo nX} go X a gaH$mZm Mm{hE & Xn U H$mo nX} H$s Amoa gaH$mZm Mm{hE & Xn U Am a nX} XmoZm| H$mo gy` H$s Amoa gaH$mZm Mm{hE & Ho$db nX} H$mo hr gy` H$s Amoa gaH$mZm Mm{hE & A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do ? (A) (B) Should move the mirror and screen both towards the sun. (D) 31/2/1 Should move the mirror towards the screen. (C) 31. Should move the mirror away from the screen. Should move only the screen towards the sun. C mb b|g H$s \$moH$g X ar {ZYm [aV H$aVo g_` Amn b|g mam {H$gr X a W {~ ~ H$m {V{~ ~ nX} na \$moH${gV H$aZo H$m `mg H$aVo h & nX} na ~ZZo dmbm `h {V{~ ~, {~ ~ Ho$ gmnoj H $gm hmoZm Mm{hE ? (A) grYm Am a ~h V N>moQ>m (B) grYm Am a ~ S>m (C) C Q>m Am a ~ S>m (D) C Q>m Am a ~h V N>moQ>m 13 1 P.T.O. While determining the focal length of a convex lens, you try to focus the image of a distant object formed by the lens on the screen. The image formed on the screen, as compared to the object, should be (A) (B) erect and enlarged (C) inverted and enlarged (D) 32. erect and highly diminished inverted and highly diminished H$m M Ho Am`VmH$ma b ~ go Jw OaZo dmbr H$me {H$aU H$m nW AZwao{IV H$aZo Ho$ {bE ZrMo Xem `r JB Mma m`mo{JH$ `d WmAm| _| go gd lo > `d Wm H$m Z-gr h ? Which of the following is the best experimental set-up out of the four shown for tracing the path of a ray of light passing through a rectangular glass slab ? 31/2/1 14 1 33. ZrMo {XE JE Mma AmaoIm| _| go {H$g_| H$m M Ho$ { _ go Jw OaZo dmbr H$me {H$aU H$m nW ghr T> J go Xem `m J`m h ? 1 In which of the following four diagrams is the correct path of a ray of light passing through a glass prism shown ? 31/2/1 15 P.T.O. 34. H$moB N>m Eogr{Q>H$ A b Ho$ JwUY_m] H$m A ``Z H$a ahm h & CgHo$ mam ojU {H$E OmZo dmbo Eogr{Q>H$ A b Ho$ Xmo ^m {VH$ JwUY_m] H$s gyMr ~ZmBE & O~ dh Bg A b _| EH$ MwQ>H$s gmo{S>`_ hmBS >moOZ H$m~m}ZoQ> {_bmVm h V~ `m hmoVm h ? H$moB Xmo ojU {b{IE & 2 A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid ? Write any two observations. 35. H$moB N>m `r Q> _| _wHw$bZ mam Ab {JH$ OZZ Ho$ {d{^ MaUm| H$mo Wm`r bmBS> _| gy _Xeu mam XoI ahm h & dh bmBS> _| Omo Hw$N> XoIVm h Cgo AmaoI ItMH$a (H $_dma) Xem BE & 2 A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he sees (in proper sequence). 36. H$moB N>m 8.0 cm b ~m {~ ~ 20 cm \$moH$g X ar Ho$ {H$gr C mb b|g Ho$ _w ` Aj Ho$ b ~dV aIVm h & {~ ~ H$s bo|g go X ar 30 cm aIH$a dh b|g Ho$ X gar Amoa nX} na {~ ~ H$m Vr U {V{~ ~ m V H$aVm h & nX} na m V {V{~ ~ H$s H ${V (C Q>m, grYm {dd{Y V, N>moQ>m) `m hmoJr ? AnZo C ma H$s nw{ > Ho$ {bE {H$aU AmaoI It{ME & A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen ? Draw ray diagram to justify your answer. 31/2/1 16 2

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