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CBSE Board Exam Class 10 2017 : Science

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

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SET-1 H$moS> Z . Series HRK Code No. amob Z . 31/1 narjmWu H$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 > 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 31/1 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 V 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 V _| 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. (vii) Question numbers 7 to 18 in Section A are three-marks questions. These are to be answered in about 50 words each. 31/1 2 (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 g_OmVr` loUr Ho$ { Vr` Am a V Vr` gX ` H$m Amp dH$ gy {b{IE {OgH$m W_ gX ` _oW Z h & 1 Write the molecular formula of the 2nd and the 3rd member of the homologous series whose first member is methane. 2. O~ H$moB H$mo{eH$m OZZ H$aVr h , V~ CgHo$ DNA H$m `m hmoVm h ? 1 When a cell reproduces, what happens to its DNA ? 3. {Z Z{b{IV Im m Ibm _|, eoa H$mo D$Om Cnb Y Wr ? 100 J D$Om Cnb Y h & C nmXH$ Va na {H$VZr 1 {haU eoa In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer ? nmXn Plants Deer Lion 4. H$moB {~ ~ 15 cm \$moH$g X ar Ho$ AdVb b|g go 30 cm X ar na p WV h & b|g mam ~Zo {V{~ ~ Ho$ Mma A{^bjUm| ( H ${V, p W{V, Am{X) H$s gyMr ~ZmBE & 2 An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens. 5. (i) dZm|, Ed (ii) d `-OrdZ Ho$ g ajU Ho$ Xmo bm^ {b{IE & 2 State two advantages of conserving (i) forests, and (ii) wild-life. 31/1 3 P.T.O. 6. gm_wXm{`H$ Va na Ob g J hU go g ~ Xmo _wI bm^m| H$s `m `m H$s{OE & 2 Explain two main advantages associated with water harvesting at the community level. 7. EWmZm b H$m g aMZm-gy {b{IE & `m hmoVm h O~ Bgo gm H2SO4 Ho$ Am{Y ` _| 443 K na J_ {H$`m OmVm h ? A{^{H $`m H$m g_rH$aU {b{IE VWm Bg A{^{H $`m _| gm H2SO4 H$s ^y{_H$m H$m C oI H$s{OE & 3 Write the structural formula of ethanol. What happens when it is heated with excess of conc. H2SO4 at 443 K ? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction. 8. `oH$ Ho$ {bE amgm`{ZH$ g_rH$aU H$s ghm`Vm go E Q>arH$aU Am a gm~wZrH$aU A{^{H $`mAm| Ho$ ~rM {d^oXZ H$s{OE & (i) E Q>am|, Am a (ii) gm~wZrH$aU {H $`m H$m EH$-EH$ Cn`moJ {b{IE & 3 Distinguish between esterification and saponification reactions with the help of the chemical equations for each. State one use of each (i) esters, and (ii) saponification process. 9. AmYw{ZH$ AmdV gmaUr _| AmdVm] Am a g_yhm| H$s g `m {b{IE & (i) {H$gr AmdV _| ~mB Amoa go XmB Amoa OmZo na, VWm (ii) {H$gr g_yh _| D$na go ZrMo OmZo na V dm| Ho$ Ymp dH$ A{^bjUm| _| {H$g H$ma n[adV Z hmoVm h ? AnZo C ma H$s H$maU g{hV nwp Q> H$s{OE & 3 Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving (i) from left to right in a period, and (ii) down a group ? Give reason to justify your answer. 10. Na, Mg Am a Al AmYw{ZH$ AmdV gmaUr Ho$ Vrgao AmdV Ho$ V d h {OZH$s g_yh g `m H $_e: 1, 2 Am a 13 h & BZ_| go {H$g V d H$s (a) g `moOH$Vm A{YH$V_, (b) na_mUw { `m A{YH$V_, VWm (c) amgm`{ZH$ A{^{H $`merbVm A{YH$V_ h ? `oH$ Ho$ {bE 3 AnZo C ma H$s H$maU g{hV nwp Q> H$s{OE & Na, Mg and Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity ? Justify your answer stating the reason for each. 31/1 4 11. OZZ gOrdm| H$m EH$ A ` V _h dnyU bjU h & Bg H$WZ Ho$ nj _| VrZ H$maU Xr{OE & 3 Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement. 12. H$m{`H$ dY Z `m h ? Bg {d{Y Ho$ Xmo bm^ Am a Xmo hm{Z`m {b{IE & 3 What is vegetative propagation ? State two advantages and two disadvantages of this method. 13. J^ YmaU H$mo amoH$Zo Ho$ {bE {dH${gV H$s JB VrZ VH$ZrH$m| H$s gyMr ~ZmBE & BZ_| go H$m Z-gr VH$ZrH$ nw fm| Ho$ {bE Zht h ? BZ VH$ZrH$m| H$m Cn`moJ {H$g H$ma {H$gr n[adma Ho$ dm ` Am a g_ { H$mo grYo ^m{dV H$aVm h ? 3 List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males ? How does the use of these techniques have a direct impact on the health and prosperity of a family ? 14. _ oS>b Zo `h {H$g H$ma n Q> {H$`m {H$ `h g ^d h {H$ H$moB bjU d emZwJV hmo OmE na Vw {H$gr Ord _| ` V Z hmo nmE ? 3 How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism ? 15. O d-{dH$mg VWm Ordm| H$m dJuH$aU na na g ~p YV h & Bg H$WZ H$s H$maU g{hV nwp Q> H$s{OE & 3 Evolution and classification of organisms are interlinked. Give reasons to justify this statement. 16. `{X H$moB b|g CgHo$ gm_Zo p WV {H$gr {~ ~ H$s {H$gr ^r p W{V Ho$ {bE gX d hr grYm Am a N>moQ>m {V{~ ~ ~ZmVm h , Vmo Cg b|g H$s H ${V `m h ? AnZo C ma H$s nwp Q> {H$aU AmaoI ItMH$a H$s{OE & `{X Bg b|g H$s j_Vm H$m g `m _H$ _mZ 10 D h , Vmo H$mVu` Umbr Ho$ AZwgma BgH$s \$moH$g X ar `m h ? 3 If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens ? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ? 31/1 5 P.T.O. 17. H$m M Ho$ {H$gr { _ mam doV H$me Ho$ {djonU H$m H$maU {b{IE & `yQ>Z Zo H$m M Ho$ Xmo gd g_ { _m| mam `h {H$g H$ma Xem `m {H$ doV H$me gmV dUm] H$m ~Zm h ? {H$aU AmaoI ItMH$a Xem BE {H$ O~ H$moB g H$sU doV H$me nw O EH$-X gao go C Q>o `dp WV H$m M Ho$ Xmo gd g_ { _m| Ho$ g `moOZ Ho$ W_ { _ Ho$ EH$ \$bH$ na {V` H$V: AmnVZ H$aVm h , Vmo Bg g `moOZ _| Cg nw O H$m `m hmoVm h ? 3 State the cause of dispersion of white light by a glass prism. How did Newton, using two identical glass prisms, show that white light is made of seven colours ? Draw a ray diagram to show the path of a narrow beam of white light, through a combination of two identical prisms arranged together in inverted position with respect to each other, when it is allowed to fall obliquely on one of the faces of the first prism of the combination. 18. (a) Ob EH$ A ` V _h dnyU mH ${VH$ g gmYZ h , Omo OrdZ Ho$ {bE A_ V h & AmnHo$ {dkmZ Ho$ {ejH$ `h MmhVo h {H$ Amn aMZm _H$ _y `m H$Z {H $`mH$bmn Ho$ {bE, mUmYma mH ${VH$ g nXm Ob H$mo H $go ~MmE {df` na H$moB `moOZm ~ZmBE & Ob H$mo H $go ~MmE Ho$ ~mao _| AnZo n S>mog _| OmJ $H$Vm C n H$aZo Ho$ {bE H$moB Xmo Cnm` gwPmBE & (b) {H$gr EH$ Cnm` H$m Zm_ Am a CgH$s `m `m H$s{OE {OgHo$ mam ^m _Ob Va H$mo Am a ZrMo {JaZo go amoH$m Om gHo$ & (a) Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, How to save water, the vital natural resource . Write any two ways that you will suggest to bring awareness in your neighbourhood, on how to save water . (b) Name and explain any one way by which the underground water table does not go down further. 31/1 6 3 19. Hw$N> `m {JH$m| H$mo hmBS >moH$m~ Z `m| H$hm OmVm h ? Eo Ho$Z, Eo H$sZ Am a Eo H$mBZ H$s g_OmVr` lo{U`m| H$m gm_m ` gy {b{IE VWm `oH$ loUr Ho$ W_ gX ` H$s g aMZm ^r It{ME & Eo H$sZ H$mo Eo Ho$Z _| n[ad{V V H$aZo H$s A{^{H $`m H$m Zm_ {b{IE Am a amgm`{ZH$ g_rH$aU mam Bg A{^{H $`m Ho$ hmoZo Ho$ {bE Amd `H$ n[ap W{V`m| H$mo ^r Xem BE & 5 Why are certain compounds called hydrocarbons ? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur. 20. (a) _mZd _mXm OZZ V Ho$ {Z Z{b{IV `oH$ ^mJ Ho$ H$m`m] H$m C oI H$s{OE (i) A S>me` (ii) J^m e` (iii) \ $bmo{n`Z Q> y~ (b) _mZd _mXm _| b go Q>m H$s g aMZm Am a H$m`m] H$m C oI H$s{OE & (a) Write the functions of each of the following parts in a human female reproductive system : (b) 21. (i) Ovary (ii) Uterus (iii) Fallopian tube : 5 Write the structure and functions of placenta in a human female. `oH$ H$m EH$-EH$ CXmhaU XoH$a Cnm{O V bjUm| Am a AmZwd {eH$ bjUm| Ho$ ~rM {d^oXZ H$s{OE & {H$gr `{ Q> mam AnZo g nyU OrdZ-H$mb _| Cnm{O V bjU/AZw^d AJbr nr T>r _| d emZwJV `m| Zht hmoVo ? Bg V ` H$m H$maU CXmhaU XoH$a n Q> H$s{OE & 5 With the help of one example for each, distinguish between the acquired traits and the inherited traits. Why are the traits/experiences acquired during the entire lifetime of an individual not inherited in the next generation ? Explain the reason of this fact with an example. 31/1 7 P.T.O. 22. {Z Z{b{IV ojU Vm{bH$m H$m {d bofU H$s{OE, {Og_| C mb b|g H$s p W{V _|$ {~ ~-X ar (u) Ho$ gmW {V{~ ~-X ar (v) H$m {dMaU Xem `m J`m h , Am a {~Zm H$moB n[aH$bZ {H$E hr {Z Z{b{IV Zm| Ho$ C ma Xr{OE : (a) (b) (c) H $_ g `m {~ ~-X ar {V{~ ~-X ar u (cm) v (cm) 1 2 3 4 5 6 100 60 40 30 25 15 + 25 + 30 + 40 + 60 + 100 + 120 C mb b|g H$s \$moH$g X ar `m h ? AnZo C ma H$s nwp Q> Ho$ {bE H$maU Xr{OE & Cg ojU H$s H $_ g `m {b{IE Omo ghr Zht h & `h {Z H$f AmnZo {H$g AmYma na {ZH$mbm h ? {H$gr C{MV n _mZo H$mo MwZH$a H $_ g `m 2 Ho$ ojU Ho$ {bE {H$aU AmaoI It{ME & AmdY Z H$m bJ^J _mZ ^r kmV H$s{OE & Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations : S.No. 1 2 3 4 5 6 31/1 Object-Distance u (cm) 100 60 40 30 25 15 Image-Distance v (cm) + 25 + 30 + 40 + 60 + 100 + 120 (a) What is the focal length of the convex lens ? Give reason to justify your answer. (b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion ? (c) Select an appropriate scale and draw a ray diagram for the observation at S.No.2. Also find the approximate value of magnification. 8 5 23. (a) (b) 24. (a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why. (b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is + 24 cm. (a) {ZH$Q>- p Q> Xmof go nr{ S>V H$moB N>m 5 m go A{YH$ X ar na p WV {~ ~m| H$mo n Q> Zht XoI nmVm & Bg { > Xmof Ho$ C n hmoZo Ho$ Xmo g ^m{dV H$maUm| H$s gyMr ~ZmBE & {H$aU AmaoIm| H$s ghm`Vm go `m `m H$s{OE {H$ (i) dh N>m 5 m go A{YH$ X ar na p WV {~ ~m| H$mo n Q> `m| Zht XoI nmVm & (ii) Bg p Q> Xmof Ho$ g emoYZ Ho$ {bE Cgo {H$g H$ma Ho$ b|g H$m Cn`moJ H$aZm Mm{hE Am a Bg b|g Ho$ Cn`moJ mam Bg Xmof H$m g emoYZ {H$g H$ma hmoVm h & `{X, Bg H$aU _|, g emoYH$ b|g H$s \$moH$g X ar H$m g `m _H$ _mZ 5 m h , Vmo Z`r H$mVu` {M n[anmQ>r Ho$ AZwgma Bg b|g H$s j_Vm kmV H$s{OE & (b) (a) (b) 31/1 `{X {H$gr Xn U mam CgHo$ gm_Zo p WV {~ ~ H$s {H$gr ^r p W{V Ho$ {bE gX d hr N>moQ>m, grYm Am a Am^mgr {V{~ ~ ~ZVm h , Vmo Bg Xn U H$s H ${V {b{IE Am a AnZo C ma H$s nwp Q> Ho$ {bE {H$aU AmaoI ^r It{ME & Bg H$ma Ho$ Xn Um| H$m EH$ Cn`moJ {b{IE VWm BZH$m Cn`moJ `m| {H$`m OmVm h , CgH$m C oI H$s{OE & Jmobr` Xn Um| H$s dH $Vm { `m H$s n[a^mfm {b{IE & {H$gr Jmobr` Xn U H$s H ${V Am a \$moH$g X ar kmV H$s{OE, {OgH$s dH $Vm { `m + 24 cm h & 5 5 A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain (i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes. (ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens. If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention. 9 P.T.O. ^mJ ~ SECTION B 25. O~ Amn EH$ naIZbr _| gmo{S>`_ ~mBH$m~m}ZoQ> H$m MyU boH$a Cg_| Eogr{Q>H$ A b H$s Hw$N> ~y X| S>mbVo h , Vmo {Z Z{b{IV _| go H$m Z-gm ojU H$aVo h ? (A) H$moB A{^{H $`m Zht hmoVr (B) VrIr J Y dmbr a JhrZ J g H$m Vrd ~wX~wXmhQ> Ho$ gmW {d_moMZ (C) Vrd ~wX~wXmhQ> Ho$ gmW ^yao a J H$s J g H$m {d_moMZ (D) a JhrZ Am a J YhrZ J g Ho$ ~wb~wbm| H$m ~ZZm 1 When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation ? 26. (A) No reaction takes place (B) A colourless gas with pungent smell is released with brisk effervescence (C) A brown coloured gas is released with brisk effervescence (D) Formation of bubbles of a colourless and odourless gas gm~wZrH$aU A{^{H $`m H$m A ``Z H$aVo g_` Amn ~rH$a _| O~ g_mZ _m m _| {H$gr a JhrZ dZ n{V Vob _| NaOH H$m 20% Obr` {db`Z {_bmVo h , Vmo `m ojU H$aVo h ? (A) {_lU H$m a J Jham ^yam hmo J`m h (B) ~rH$a _| Vrd ~wX~wXmhQ> hmo ahr h (C) ~rH$a H$m ~mhar n R> Ja_ hmo J`m h (D) ~rH$a H$m ~mhar n R> R> S>m hmo J`m h While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker ? 31/1 (A) The colour of the mixture has become dark brown (B) A brisk effervescence is taking place in the beaker (C) The outer surface of the beaker has become hot (D) The outer surface of the beaker has become cold 10 1 27. {H$gr N>m H$mo CgH$s `moJembm _| `moJ H$aZo Ho$ {bE H$R>moa Ob Mm{hE Omo Amg-nmg Ho$ jo _| Cnb Y Zht h & `moJembm _| Hw$N> bdU h , Omo AmgwV Ob _| KmobZo na Cgo H$R>moa Ob ~Zm gH$Vo h & bdU Ho$ {Z Z{b{IV g_yhm| _| go dh g_yh Mw{ZE {OgHo$ `oH$ bdU H$mo AmgwV Ob _| Kmobo OmZo na Cgo H$R>moa Ob ~Zm XoJm & (A) gmo{S>`_ bmoamBS>, nmoQ> {e`_ bmoamBS> (B) gmo{S>`_ g \o$Q>, nmoQ> {e`_ g \o$Q> (C) gmo{S>`_ g \o$Q>, H $p g`_ g \o$Q> (D) H $p g`_ g \o$Q>, H $p g`_ bmoamBS> 1 A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard. 28. (A) Sodium chloride, Potassium chloride (B) Sodium sulphate, Potassium sulphate (C) Sodium sulphate, Calcium sulphate (D) Calcium sulphate, Calcium chloride { ~rOn r ~rO Ho$ ^ yU Ho$ {d{^ ^mJm| H$mo nhMmZZo H$m `moJ H$aZo Ho$ {bE gd W_ AmnH$mo H$moB { ~rOn r ~rO Mm{hE & {Z Z{b{IV g_yh _| go { ~rOn r ~rO Mw{ZE : 1 J|h , MZm, _ H$m, _Q>a, Om , _y J\$br (A) (B) (C) (D) Johy , MZm Am a _Q>a MZm, _Q>a Am a _y J\$br _ H$m, _Q>a Am a Om MZm, _ H$m Am a _y J\$br To perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seeds from the following group : Wheat, Gram, Maize, Pea, Barley, Ground-nut 31/1 (A) Wheat, Gram and Pea (B) Gram, Pea and Ground-nut (C) Maize, Pea and Barley (D) Gram, Maize and Ground-nut 11 P.T.O. 29. EH$ Q>moH$ar _| {Z Z{b{IV gp O`m aIr h : Amby, Q>_mQ>a, _ybr, ~ JZ, JmOa, bm H$s BZ_| go H$m Z-gr Xmo gp O`m g_OmV g aMZmAm| H$m ghr {Z $nU H$aVr h (A) JmOa Am a Q>_mQ>a (B) Amby Am a ~ JZ (C) _ybr Am a JmOa (D) _ybr Am a bm H$s ? 1 The following vegetables are kept in a basket : Potato, Tomato, Radish, Brinjal, Carrot, Bottle-gourd Which two of these vegetables correctly represent the homologous structures ? 30. (A) Carrot and Tomato (B) Potato and Brinjal (C) Radish and Carrot (D) Radish and Bottle-gourd {XE JE {H$aU AmaoIm| H$m A ``Z H$s{OE Am a {Z Z{b{IV _| go ghr H$WZ Mw{ZE (A) (B) (C) (D) 31/1 X AdVb Xn U 20 cm Am a 25 cm h h Am a `w{ $ Y C mb b|g & `w{ V X C mb b|g h Am a `w{ $ Y AdVb Xn U 10 cm Am a 25 cm h & `w{ V X AdVb b|g h Am a `w{ $ Y C mb Xn U 20 cm Am a 25 cm h & `w{ V X C mb b|g h Am a `w{ $ Y AdVb Xn U 20 cm Am a 25 cm h & `w{ V 12 : h , {OZH$s \$moH$g X [a`m H $_e: h , {OZH$s \$moH$g X [a`m H $_e: h , {OZH$s \$moH$g X [a`m H $_e: h , {OZH$s \$moH$g X [a`m H $_e: 1 Study the given ray diagrams and select the correct statement from the following : 31. (A) Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20 cm and 25 cm respectively. (B) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 10 cm and 25 cm respectively. (C) Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20 cm and 25 cm respectively. (D) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20 cm and 25 cm respectively. H$moB N>m C mb b|g mam {H$gr X a W {~ ~ H$m Yw Ybm {V{~ ~ naXo na m V H$aVm h & naXo na n Q> {V{~ ~ m V H$aZo Ho$ {bE Cgo Xn U H$mo {IgH$mZm hmoJm (A) naXo go X a (B) naXo H$s Amoa (C) {H$gr Eogr p W{V na Omo naXo go H$m \$s X a h (D) `m Vmo naXo H$s Amoa `m naXo go X a, `h {~ ~ H$s p W{V na {Z^ a H$aVm h 1 A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens 31/1 (A) away from the screen (B) towards the screen (C) to a position very far away from the screen (D) either towards or away from the screen depending upon the position of the object 13 P.T.O. 32. H$moB N>m A ` V gmdYmZrnyd H$ AmnVZ H$moU ( i) Ho$ {d{^ _mZm| Ho$ {bE H$m M Ho$ b ~ go Jw OaZo dmbr H$me {H$aU H$m nW Amao{IV H$aVm h & {\$a dh AmnVZ H$moU Ho$ `oH$ _mZ Ho$ {bE AndV Z H$moU ( r) Am a {ZJ V H$moU ( e) Ho$ g JV _mZm| H$mo _mnVm h & BZ H$moUm| H$s _mnm| H$m {d bofU H$aHo$ Cgo `m {Z H$f {ZH$mbZm Mm{hE ? (A) i> r> e (B) i= e> r (C) i< r< e (D) i= e< r 1 A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence ( i). He then measures the corresponding values of the angle of refraction ( r) and the angle of emergence ( e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be 33. (A) i> r> e (B) i= e> r (C) i< r< e (D) i= e< r {Z Z{b{IV {H$aU AmaoI H$m A ``Z H$s{OE : Bg AmaoI _| AmnVZ H$moU, {ZJ V H$moU Am a {dMbZ H$moU H$mo H $_e: {H$ZHo$ mam {Z ${nV {H$`m J`m h ? 31/1 (A) y, p, z (B) (C) (D) x, q, z p, y, z p, z, y 14 1 Study the following ray diagram : In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by 34. (A) y, p, z (B) x, q, z (C) p, y, z (D) p, z, y `moJembm _| gm~wZ ~ZmZo Ho$ {bE Amd `H$ gm_J r (amgm`{ZH$ nXmWm]) H$m C oI H$s{OE & gm~wZrH$aU A{^{H $`m Ho$ A{^{H $`m {_lU H$s H ${V (A br` /jmar`) H$mo {ZYm [aV H$aZo dmbm narjU Amn {H$g H$ma H$a|Jo ? g jon _| dU Z H$s{OE & 2 Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction. 35. 2 A_r~m _| { I S>Z H$s {H $`m H$mo (Mma MaUm| mam) H $_dma AmaoI ItMH$a Xem BE & Draw in sequence (showing the four stages), the process of binary fission in Amoeba. 31/1 15 P.T.O. 36. H$moB N>m 10 cm \$moH$g X ar Ho$ C mb b|g H$m Cn`moJ H$aHo$ b|g go bJ^J 2 m X ar na aIr _mo_~ mr H$s dmbm H$mo naXo na \$moH${gV H$aVm h & BgHo$ n MmV dh dmbm H$mo Yrao-Yrao b|g H$s Amoa {IgH$mVm h Am a ha ~ma CgHo$ {V{~ ~ H$mo naXo na \$moH${gV H$aVm h & (A) naXo na dmbm H$mo \$moH${gV H$aZo Ho$ {bE Cgo b|g H$mo {H$g {Xem _| {IgH$mZm hmoVm h ? (B) naXo na ~Zo dmbm Ho$ {V{~ ~ Ho$ gmB O _| `m A Va hmoVm h ? (C) naXo na ~Zo dmbm Ho$ {V{~ ~ H$s Vrd Vm (M_H$) _| `m A Va {XImB XoVm h (D) O~ dmbm b|g Ho$ ~h V nmg (bJ^J {XImB XoVm h ? 5 cm ? X ar na) hmoVr h , Vmo naXo na `m A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen. 31/1 (A) In which direction does he move the lens to focus the flame on the screen ? (B) What happens to the size of the image of the flame formed on the screen ? (C) What difference is seen in the intensity (brightness) of the image of the flame on the screen ? (D) What is seen on the screen when the flame is very close (at about 5 cm) to the lens ? 16 2

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