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CBSE Class 10 Board Exam 2020 : Science (Series 5)

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

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H$moS> Z . Code No. amob Z . 31/5/1 narjmWu H$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. (I) ZmoQ> H $n`m Om M H$a b| {H$ Bg Z-n _o _w{ V n > 23 h & (II) 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| & (III) H $n`m Om M H$a b| {H$ Bg Z-n _| >30 Z h & H $n`m Z H$m C ma {bIZm ew $ H$aZo go nhbo, C ma-nwp VH$m _| 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 & (IV) (V) NOTE (I) Please check that this question paper contains 23 printed pages. (II) 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. (III) Please check that this question paper contains 30 questions. (IV) Please write down the Serial Number of the question in the answer-book before attempting it. (V) 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. {dkmZ SCIENCE {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 80 Time allowed : 3 hours .31/5/1 Maximum Marks : 80 1 P.T.O. gm_m ` {ZX}e : {Z Z{b{IV {ZX}em| H$mo ~h V gmdYmZr go n{ T>E Am a CZH$m g Vr go nmbZ H$s{OE : (i) `h Z-n VrZ I S>m| _ o {d^m{OV {H$`m J m h 30 Z h & g^r Z A{Zdm` h & H$, I Am a J & Bg Z-n _| (ii) I S> H$ Ho$ g^r Z/CZHo$ ^mJ, Z g `m 1 go 14 VH$ EH$-EH$ A H$ Ho$ h & BZ Zm| _| ~h {dH$ nr Z, A{V bKw-C mar` Z VWm A{^H$WZ-H$maU H$ma Ho$ Zm| H$mo gp _{bV {H$`m J`m h & BZ Zm| Ho$ C ma EH$ e X AWdm EH$ dm ` _| {XE OmZo Mm{hE & (iii) I S> I _| Z g `m 15 go 24 VH$ bKw-C mar` H$ma Ho$ Z h , `oH$ Z H$m h & `oH$ Z H$m C ma bJ^J 50 go 60 e Xm| go A{YH$ Zht hmoZm Mm{hE & 3 A H$ (iv) I S> J _| Z g `m 25 go 30 VH$ XrK -C mar` H$ma Ho$ Z h , `oH$ Z H$m h & `oH$ Z H$m C ma bJ^J 80 go 90 e Xm| go A{YH$ Zht hmoZm Mm{hE & 5 A H$ (v) C ma g {j VWm q~X dma hmoZm Mm{hE Am a gmW hr Cn`w $ e X gr_m H$m `Wmg ^d nmbZ {H$`m OmZm Mm{hE & (vi) Z-n _| g_J na H$moB {dH$ n Zht h & VWm{n `oH$ I S> _| Hw$N> Zm| _| Am V[aH$ {dH$ n {XE JE h & Eogo Zm| _ o go Ho$db EH$ hr {dH$ n H$m C ma {b{IE & (vii) BgHo$ A{V[a $, Amd `H$VmZwgma, `oH$ I S> Am a Z Ho$ gmW `Wmo{MV {ZX}e {XE JE h & I S> H$ 1. ghg `moOr `m {JH$ gm_m `V: {d wV Ho$ Hw$MmbH$ hmoVo h & `m| 2. {Z Z{b{IV V dm| Ho$ gm_m ` JwU H$m C boI H$s{OE ? : 1 1 ~moam Z, {g{bH$m Z, O_}{Z`_ Am a Amg}{ZH$ AWdm Cg AmdV {Z`_ H$m C boI H$s{OE {Og na AmYw{ZH$ AmdV gmaUr AmYm[aV h & .31/5/1 2 1 General Instructions : Read the following instructions very carefully and strictly follow them : (i) This question paper comprises three Sections A, B and C. There are 30 questions in the question paper. All questions are compulsory. (ii) Section A Questions no. 1 to 14 all questions or part thereof are of one mark each. These questions comprise Multiple Choice Questions (MCQ), Very Short Answer (VSA) and Assertion Reason type questions. Answer to these questions should be given in one word or one sentence. (iii) Section B Questions no. 15 to 24 are short answer type questions, carrying 3 marks each. Answer to these questions should not exceed 50 to 60 words. (iv) Section C Questions no. 25 to 30 are long answer type questions, carrying 5 marks each. Answer to these questions should not exceed 80 to 90 words. (v) Answers should be brief and to the point. Also the above mentioned word limit be adhered to as far as possible. (vi) There is no overall choice in the question paper. However, an internal choice has been provided in some questions in each Section. Only one of the choices in such questions have to be attempted. (vii) In addition to this, separate instructions are given with each section and question, wherever necessary. SECTION A 1. Covalent compounds are generally poor conductors of electricity. Why ? 1 2. State the common characteristic of the following elements : 1 Boron, Silicon, Germanium and Arsenic OR State the Periodic Law on which the Modern Periodic Table is based. .31/5/1 3 1 P.T.O. 3. {Z Z{b{IV AZw N>oX Am a g ~ {YV n T>r J`t g H$ nZmAm| H$s `m `m Ho$ AmYma na Z g `m 3(a) go 3(d) Ho$ C ma Xr{OE : ^maV _| gm a e{ $ EH$ Vrd {dH${gV hmoVm h Am C moJ h & 31 OwbmB , 2019 VH$ Xoe H$s gm a {V R>m{nV j_Vm 30.071 GW VH$ nh M JB Wr & ^maV _| {V R>m{nV gm a e{ $ g ` m| H$s {V MW ny Or bmJV g~go H$_ h & OZdar 2019 _| gm a {d wV OZZ Hw$b Cn`moJ hmoZo dmbr {d wV OZZ H$m bJ^J 3.4% [aH$m S> H$s JB & {Z Z{b{IV Vm{bH$m _| {nN>bo N>: dfm] _| dm{f H$ gm a e{ $ OZZ H$mo Xem `m J`m h & df gm a e{ $ OZZ 2013 14 3.35 2014 15 4.60 2015 16 7.45 2016 17 12.09 2017 18 25.87 2018 19 39.27 (TWh) h_mam Xoe ^m `embr h {H$ df Ho$ A{YH$m e ^mJ _| gm a D$Om m V hmoVr ahVr h & Eogm AZw_mZ h {H$ ^maV 5000 {Q >{b`Z kWh Ho$ Vw ` D$Om go A{YH$ D$Om EH$ df _| gy` go m V H$aVm h & 3(a) gm a gob `m h 3(b) Yyn _| aIo OmZo na {H$gr $nr gm a gob go {H$VZr dmo Q>Vm {dH${gV Am a {H$VZr {d wV C n H$s Om gH$Vr h ? 1 3(c) ^maV _| gm a D$Om mam e{ $ OZZ H$m ^{d ` C db h & BgH$m H$maU Xr{OE & 1 3(d) gm a gobm| Ho$ Xmo bm^m| H$mo gyMr~ H$s{OE & 1 .31/5/1 ? 1 4 3. Answer question numbers 3(a) 3(d) on the basis of your understanding of the following paragraph and the related studied concepts : Solar power in India is a fast developing industry. The country s solar installed capacity reached 30 071 GW as of 31 July, 2019. India has the lowest capital cost per MW to install solar power plants. Solar electricity generation recorded nearly 3 4% of total utility electricity generation in January 2019. The following table shows Annual Solar Power Generation of the last six years. Year Solar Power Generation (TWh) 2013 14 3 35 2014 15 4 60 2015 16 7 45 2016 17 12 09 2017 18 25 87 2018 19 39 27 Our country is lucky to receive solar energy for the greater part of the year. It is estimated that during a year India receives the energy equivalent to more than 5000 trillion kWh from the Sun. 3(a) What are solar cells ? 1 3(b) How much voltage can be developed and how much electricity can be produced by one typical solar cell when exposed to the Sun ? 3(c) 3(d) .31/5/1 1 The future of power generation by solar energy is bright in India. Give reason. 1 List two advantages of solar cells. 1 5 P.T.O. 4. Z g `m 4(a) go AmYm[aV h & 4(d) ZrMo Xr JB Vm{bH$m Am a AZw N>oX _| Xr JB g ~ {YV gyMZmAm| na WmBam BS> C rnH$ hm _m}Z (TSH) Wm`am p gZ C n H$aZo Ho$ {bE WmBam BS> J {W H$mo C r V H$aVm h & ZrMo Xr JB Vm{bH$m H$m A ``Z H$s{OE & Vm{bH$m : J^m d Wm H$s Ad{Y _| TSH Ho$ Va J^m d Wm H$m MaU W_ {V_mhr gm_m ` {Z Z C M (mU/L) (mU/L) (mU/L) 0 .2 2 . 5 < 0.2 2.5 10 { Vr` {V_mhr 0 .3 3 . 0 < 0.3 3.01 4.5 V Vr` {V_mhr 0 .8 5 . 2 < 0.8 > 5.3 J^m d Wm _| TSH Ho$ Va H$mo _m ZrQ>a H$aZm _h dnyU hmoVm h & TSH H$m C M Va Am a hmBnmoWmBam B{S> _ J^m nmV Ho$ g `moJ H$mo {deof $n go ^m{dV H$a gH$Vm h & AV: WmBam BS> J {W H$s g_w{MV {H $`m Ho$ {Z`_Z/{Z` U Ho$ {bE S>m Q>a Ho$ nam_e mam C{MV XdmB`m ({M{H$ gm) XoZm Amd `H$ hmoVm h & 5. 4(a) TSH H$m nyam Zm_ {b{IE & 1 4(b) TSH Ho$ _wI H$m` H$m C boI H$s{OE & 1 4(c) J^ dVr _{hbmAm| Ho$ 4(d) {H$gr J^ dVr _{hbm H$m TSH Va XoI-^mb H$s Amd `H$Vm h ? TSH Va H$mo _m ZrQ>a H$aZo H$s Amd `H$Vm `m| h 8.95 mU/L ? h & Cgo {H$g H$ma H$s O~ h_ gm_m ` Zo go {H$gr {~ ~ H$s X ar _| d { H$aVo h , Vmo A{^Zo b|g go {V{~ ~ X ar (A) ~ T> OmVr h & (B) KQ> OmVr h & (C) _| H$moB n[adV Z Zht hmoVm & (D) Zo -JmobH$ Ho$ gmB O na {Z^ a H$aVr h & .31/5/1 6 1 1 1 4. Question numbers 4(a) 4(d) are based on the table and related information in the passage given below. Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below. Table : TSH levels during pregnancy Stage of pregnancy Normal (mU/L) Low (mU/L) High (mU/L) First trimester 0 2 2 5 < 0 2 2 5 10 Second trimester 0 3 3 0 < 0 3 3 01 4 5 Third trimester 0 8 5 2 < 0 8 > 5 3 It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland. 4(a) Give the full form of TSH. 1 4(b) State the main function of TSH. 1 4(c) Why do TSH levels in pregnant women need to be monitored ? 1 4(d) A pregnant woman has TSH level of 8 95 mU/L. What care is needed for her ? 5. 1 The image distance from the eye lens in the normal eye when we increase the distance of an object from the eye (A) increases. (B) decreases. (C) remains unchanged. (D) depends on the size of the eyeball. .31/5/1 7 1 P.T.O. 6. mA Am a A Ho$ (A) (B) (C) (D) 7. 1 b ~mB l VWm EH$g_mZ AZw W-H$mQ> jo \$b A Ho$ {H$gr ~obZmH$ma MmbH$ H$m {VamoY R h & Cgr nXmW Ho$ {H$gr A ` MmbH$ {OgH$s b ~mB 2.5 l VWm {VamoY 0.5 R h , H$m AZw W-H$mQ> jo \$b hmoJm (A) (B) (C) (D) 8. _mZ H $_e: h 10 6 A Am a 10 9 A 10 3 A Am a 10 6 A 10 3 A Am a 10 9 A 10 6 A Am a 10 3 A 5A 2 .5 A 0 .5 A 1 A 5 {H$gr ZB n[a`moOZm H$mo Ama ^ H$aVo g_` gm_m `V: H$s OmZo dmbr {Z Z{b{IV AmbmoMZmAm| na {dMma H$s{OE : I. {~Zm _wAmd Om {XE {H$gmZm| Am a WmZr` Am{Xdm{g`m| H$m {d WmnZ & II. {~Zm {H$gr bm^ Ho$ OZVm Ho$ ~h V A{YH$ YZ H$mo brb OmZm & III. dZmo _ybZ Am a O d{d{dYVm H$s hm{Z & {deofH$a ~ S>o ~m Ym| Ho$ ~mao _| hmoZo dmbr AmbmoMZmE h (A) I Am a II (B) II Am a III (C) I Am a III (D) I, II Am a III AWdm AZmd `H$ ~ ~m| Am a n Im| Ho$ p dM Am \$ H$aZm VWm [agmd dmbr Q>m|{Q>`m| H$s _a _V H$amZm nm M H$ma Ho$ R _| go {H$go ghr n[a^m{fV H$aVm h ? (A) nwZ: MH $U (B) nwZ: Cn`moJ (C) nwZ: `moOZ (D) H$_ Cn`moJ> .31/5/1 1 8 1 1 6. 7. The values of mA and A are (A) 10 6 A and 10 9 A respectively (B) 10 3 A and 10 6 A respectively (C) 10 3 A and 10 9 A respectively (D) 10 6 A and 10 3 A respectively A cylindrical conductor of length l and uniform area of cross-section A has resistance R . Another conductor of length 2 5 l and resistance 0 5 R of the same material has area of cross-section (A) 5A (B) 2 5 A (C) 0 5 A 1 A 5 (D) 8. 1 1 Consider the following criticisms that are generally addressed when a new project is launched : I. Displacement of peasants and local tribals without compensation. II. Swallowing up large amount of public money without any benefits. III. Deforestation and loss of biodiversity. The criticisms about large dams in particular are (A) I and II (B) II and III (C) I and III (D) I, II and III 1 OR Switching off unnecessary lights and fans and repairing leaking taps correctly defines which term of 5R s ? (A) Recycle (B) Reuse (C) Repurpose (D) Reduce .31/5/1 9 1 P.T.O. 9. J T>dmb H$m aoZr Jm d {H$gHo$ {bE {g h ? (A) EH$ hr H$ma Ho$ d jm| nmBZ (Mr S>), gmJm Z (Q>rH$) Am a `yHo${b Q>g CJmZm (_moZmoH$ Ma) (B) {MnH$mo Am XmobZ (C) {d V V O d{d{dYVm (D) dZm| Ho$ Xj ~ YZ _| WmZr` bmoJm| H$s ^mJrXmar 10. \o$ag g \o$Q> H$mo A `{YH$ V V H$aZo na H$moB ^yam R>mog Am a Xmo J g| ~ZVr h & Bg A{^{H $`m H$mo {H$Z H$mam| _| dJuH $V {H$`m Om gH$Vm h ? (A) {d WmnZ Am a aoS>m g (B) {d`moOZ Am a aoS>m g (C) {d WmnZ Am a D$ _memofr (D) {d`moOZ Am a D$ _m-C _moMr (D$ _mjonr) 11. 12. `{X g_mZ gm Vm Ho$ 10 mL H2SO4 H$mo 10 mL Mg(OH)2 Ho$ gmW {_bm`m OmE, Vmo n[aUm_r {db`Z gmd { H$ gyMH$ H$mo {Z Z{b{IV _| go H$m Z-gm a J XoJm ? (A) bmb (B) nrbm (C) ham (D) Zrbm na_mUw H $_m H$ 12 H$m H$moB V d X na_mUw H $_m H$ 17 Ho$ {H$gr A ` V d `m {JH$ ~ZmVm h & Bg H$ma ~Zo `m {JH$ H$m gy hmoJm (A) XY (B) XY2 (C) X2Y (D) X2Y3 Y 10 1 1 Ho$ gmW H$moB AWdm H$moB V d X A br` Am gmBS> ~ZmVm h & BgH$s AmYw{ZH$ AmdV gmaUr _| gdm {YH$ g ^m{dV p W{V h (A) J wn 1 Am a AmdV 3 (B) J wn 16 Am a AmdV 3 (C) J wn 17 Am a AmdV 3 (D) J wn 2 Am a AmdV 3 .31/5/1 1 1 1 9. 10. 11. 12. The Reni village of Garhwal is famous for (A) Monocultures of pine, teak and eucalyptus. (B) Chipko Movement. (C) Extensive biodiversity. (D) Participation of local people in efficient management of forests. 1 Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as (A) displacement and redox. (B) decomposition and redox. (C) displacement and endothermic. (D) decomposition and exothermic. If 10 mL of H2SO4 is mixed with 10 mL of Mg(OH)2 of the same concentration, the resultant solution will give the following colour with universal indicator : (A) Red (B) Yellow (C) Green (D) Blue An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is (A) (B) XY XY2 (C) X2Y (D) X2Y3 OR An element X is forming acidic oxide. Its most probable position in the modern periodic table is (A) Group 1 and Period 3 (B) Group 16 and Period 3 (C) Group 17 and Period 3 (D) Group 2 and Period 3 .31/5/1 11 1 1 1 1 P.T.O. Z g `m 13 Am a 14 Ho$ {bE, Xmo H$WZ {XE JE h {OZ_| EH$ H$mo A{^H$WZ (A) VWm X gao H$mo H$maU (R) mam A {H$V {H$`m J`m h & BZ Zm| Ho$ ghr C ma ZrMo {XE JE H$mo S>m| (i), (ii), (iii) Am a (iv) _| go MwZH$a Xr{OE & (i) (ii) (iii) (iv) (A) Am a (R) XmoZm| ghr h VWm (R), A{^H$WZ (A) H$s ghr `m `m H$aVm h & (A) Am a (R) XmoZm| ghr h , na Vw (R), A{^H$WZ (A) H$s ghr `m `m Zht H$aVm (A) ghr h , na Vw (R) JbV h & (A) JbV h , na Vw (R) ghr h & h & 13. A{^H$WZ (A) : H$m~ Z H$s `m Vmo Bbo Q >m Z ImoH$a AWdm Bbo Q >m Z J hU H$aHo$ C H $ Q> J g 14. {d `mg m V H$aZo H$s ~b d { m hmoVr h & H$m~ Z Ho$ ~m V_ H$moe _| Mma Bbo Q >m Z hmoVo h Am a Bg_| H$m~ Z AWdm A ` V dm| Ho$ Bbo Q >m Zm| go gmPoXmar H$aZo H$s d { m hmoVr h & C Vmnm| na YmVwAm| Ho$ Vmam| _| bKwnWZ H$s A{YH$ g ^mdZm hmoVr h & {H$gr nXmW H$m {VamoY Am a {VamoYH$Vm XmoZm| hr Vmn Ho$ gmW {dMaU H$aVo h & I S> I H$maU (R) : 15. 16. A{^H$WZ (A) : H$maU (R) : H$moB M_H$Xma YmVw M ObZo na MH$mMm Y H$aZo dmbr g\o$X dmbm go ObVr h Am a g\o$X nmCS>a N _| ~Xb OmVr h & (a) M Am a N H$s nhMmZ H$s{OE & (b) Cn`w $ A{^{H $`m H$mo g Vw{bV amgm`{ZH$ g_rH$aU Ho$ $n _| {Z ${nV H$s{OE & (c) Bg A{^{H $`m _| M H$m CnM`Z hmoVm h AWdm AnM`Z ? AnZo C ma H$s nw{ > H$s{OE & Ob Ho$ {d wV -AnKQ>Z _| (a) EoZmoS> Am a H $WmoS> na _w $ hmoZo dmbr J gm| Ho$ Zm_ {b{IE & (b) EH$ Bbo Q >moS> na _w $ hmoZo dmbr J g H$m Am`VZ X gao Bbo Q >moS> na _w $ hmoZo dmbr J g Ho$ Am`VZ H$m X JwZm `m| hmoVm h ? (c) `{X Ob _| VZw H2SO4 Z {_bmE Vmo `m hmoJm ? AWdm {H$gr amgm`{ZH$ `m {JH$ X H$m Cn`moJ gm~wZ Am a H$m M C moJ _| hmoVm h & Bgo bdU-Ob (~ mBZ) go ~Zm`m OmVm h & (a) X H$m amgm`{ZH$ Zm_, gm_m ` Zm_ Am a amgm`{ZH$ gy {b{IE & (b) BgHo$ ~ZZo _ o hmoZo dmbr A{^{H $`m H$m g_rH$aU {b{IE & (c) `m hmoVm h O~ `h Eogo Ob go A{^{H $`m H$aVm h {Og_| Ca `m Mg Ho$ bdU Kwbo hmoVo h ? .31/5/1 12 1 1 3 3 3 For question numbers 13 and 14, two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below. (i) Both (A) and (R) are true and (R) is correct explanation of the assertion (A). (ii) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A). (iii) (A) is true, but (R) is false. (iv) (A) is false, but (R) is true. 13. Assertion (A) : Carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Reason (R) : 14. Carbon has four electrons in its outermost shell and has the tendency to share electrons with carbon or other elements. 1 Assertion (A) : At high temperatures, metal wires have a greater chance of short circuiting. Reason (R) : Both resistance and resistivity of a material vary with temperature. 1 SECTION B 15. 16. A shining metal M , on burning gives a dazzling white flame and changes to a white powder N . (a) Identify M and N . (b) Represent the above reaction in the form of a balanced chemical equation. (c) Does M undergo oxidation or reduction in this reaction ? Justify. 3 In the electrolysis of water (a) Name the gases liberated at anode and cathode. (b) Why is it that the volume of gas collected on one electrode is two times that on the other electrode ? (c) What would happen if dil. H2SO4 is not added to water ? 3 OR A chemical compound X is used in the soap and glass industry. It is prepared from brine. (a) Write the chemical name, common name and chemical formula of X . (b) Write the equation involved in its preparation. (c) What happens when it is treated with water containing Ca or Mg salts ? 3 .31/5/1 13 P.T.O. 17. 18. 19. V dm| Li, K, Mg, C, Al, S _| go nhMm{ZE : (a) g_mZ g_yh (J wn) Ho$ V d (b) Xmo Bbo Q >m Z ImoZo H$s d { m dmbm V d (c) dh V d Omo AnZm A >H$ nyam H$aZo Ho$ {bE Bbo Q >m Zm| H$s gmPoXmar H$mo mW{_H$Vm XoVm h (d) g~go A{YH$ Ymp dH$ V d (e) dh V d Omo A br` Am gmBS> ~ZmVm h (f) g_yh 13 H$m V d Amhma m Ibm _| nmofr Va go `m Vm n` h ? Mma nmofr Vam| H$s Wbr` Amhma m Ibm ~ZmBE & Amhma m Ibm _| D$Om dmh gX d EH${X{eH$ hmoVm h & `m| ? AWdm nm[aV Am a CgHo$ g KQ>H$m| na AmYm[aV {Z Z{b{IV dmh AmaoI H$mo nyam H$s{OE & (a) (b) (c) .31/5/1 dgZ {H $`m _| Hy${nH$m Ho$ H$m` H$m C oI H$s{OE & Wbr` Ordm| H$s Anojm Obr` Ordmo H$s dmg Xa ~h V A{YH$ ( V) hmoVr h & BgH$m H$maU Xr{OE & byH$mo O Ho$ {dI S>Z H$mo Xem Zo dmbo {Z Z{b{IV nW H$mo nyam H$s{OE : 14 3 3 3 3 17. 18. 19. From the elements Li, K, Mg, C, Al, S identify the (a) elements belonging to the same group. (b) element which has the tendency to lose two electrons. (c) element which prefers sharing of electrons to complete its octet. (d) most metallic element. (e) element that forms acidic oxide. (f) element that belongs to group 13. 3 What is meant by trophic level in a food chain ? Construct a terrestrial food chain with four trophic levels. The energy flow in a food chain is always unidirectional. Why ? OR 3 Complete the following flow chart based on ecosystem and its components. 3 (a) In the process of respiration, state the function of alveoli. (b) Rate of breathing in aquatic organisms is much faster than that in terrestrial organisms. Give reasons. (c) Complete the following pathway showing the breakdown of glucose : .31/5/1 15 3 P.T.O. 20. 21. 22. 23. 24. (a) O~ {H$gr b ~o _Q>a Ho$ nm Yo H$m {H$gr ~m Zo _Q>a Ho$ nm Yo go g H$aU H$am`m OmVm h Vmo F1 nr T>r Ho$ g^r nm Yo gX d b ~o hr `m| hmoVo h ? (b) F1 g V{V Ho$ nm Ym| H$m dnamJU H$amZo na m V F2 g V{V Ho$ nm Yo F1 g V{V Ho$ nm Ym| go {H$g H$ma {^ hmoVo h ? Bg ojU H$m H$maU Xr{OE & (c) Bg ojU Ho$ AmYma na {ZH$mbm Om gH$Zo dmbm EH$ {Z H$f {b{IE & 3 (a) _mZd ewH $mUwAm| H$mo nmofU H$m Z XmZ H$aVm h ? ewH $mUwAm| H$m AmZwd {eH$ g KQ>Z {b{IE & (b) (i) {H$gr _mXm {eew, VWm (ii) {H$gr Za {eew H$m qbJ {ZYm aU H$aZo dmbo `w _ZO _o| Cnp WV JwUgy m| Ho$ `wJbm| H$m C oI H$s{OE & 3 {Z Z{b{IV `oH$ H$aU _| `h Xem Zo Ho$ {bE {H$aU AmaoI It{ME {H$ namdV Z Ho$ n MmV Cg Amn{VV {H$aU H$m `m hmoVm h O~ dh (a) {H$gr C mb Xn U na CgHo$ _w ` Aj Ho$ g_m Va AmnVZ H$aVr h & (b) {H$gr AdVb Xn U na CgHo$ _w ` \$moH$g go Jw OaVo h E AmnVZ H$aVr h & (c) {H$gr C mb Xn U Ho$ Y wd na Xn U Ho$ _w ` Aj Ho$ {V` H$ AmVr h B AmnVZ H$aVr h & 3 (a) {d wVamoYr Vma H$s H$moB Hw$ S>br {H$gr J d Zmo_rQ>a go g `mo{OV h & Cg p W{V _| `m ojU {H$`m OmEJm `{X {H$gr ~b N> S> Mw ~H$ Ho$ X{jU Y wd H$mo Bg Hw$ S>br Ho$ EH$ {gao (i) H$s Amoa Vo Or go bm`m OmEJm ? (ii) go Vo Or go X a bo Om`m OmEJm ? (iii) Ho$ nmg p Wa aIm OmEJm ? (b) hmoZo dmbr n[aKQ>Zm H$m Zm_ {b{IE & (c) Cn`w $ VrZ H$aUm| (i), (ii) Am a (iii) Ho$ ojUm| Ho$ AmYma na {ZH$bZo dmbm {Z H$f {b{IE & 3 H$moB N>m 2 5 m \$moH$g X ar Ho$ M _o H$m Cn`moJ H$aVm h & (a) CgHo$ { > Xmof H$m Zm_ {b{IE & (b) Bg Xmof Ho$ g emoYZ Ho$ {bE H$m Z-go b|g H$m Cn`moJ {H$`m OmVm h ? (c) Bg { > Xmof Ho$ hmoZo Ho$ Xmo _wI H$maUm| H$s gyMr ~ZmBE & (d) Bg b|g H$s e{ $ n[aH${bV H$s{OE & 3 AWdm H$maU Xr{OE : (a) Vao Ho$ g Ho$V ({g Zbm|) Ho$ {bE bmb a J MwZm OmVm h & (b) A V[aj _| AmH$me H$mbm VrV hmoVm h & (c) dm V{dH$ gy`m V Am a Am^mgr gy`m V Ho$ ~rM g_` H$m A Va bJ^J 2 {_ZQ> h & 3 .31/5/1 16 20. (a) Why is the F1 progeny always of tall plants when a tall pea plant is crossed with a short pea plant ? How is F2 progeny obtained by self-pollination of F1 progeny different from F1 progeny ? Give reason for this observation. State a conclusion that can be drawn on the basis of this observation. 3 What provides nutrition to human sperms ? State the genetic constitution of a sperm. Mention the chromosome pair present in zygote which determines the sex of (i) a female child, and (ii) a male child. 3 Draw ray diagram in each of the following cases to show what happens after reflection to the incident ray when (a) it is parallel to the principal axis and falling on a convex mirror. (b) it is falling on a concave mirror while passing through its principal focus. (c) it is coming oblique to the principal axis and falling on the pole of a convex mirror. 3 (b) (c) 21. (a) (b) 22. 23. (a) (b) (c) 24. A coil of insulated wire is connected to a galvanometer. What would be observed if a strong bar magnet with its south pole towards one face of the coil is (i) moved quickly toward it ? (ii) moved quickly away from it ? (iii) held stationary near it ? Name the phenomena involved. State the conclusion based on the observations in (i), (ii) and (iii). A student uses spectacles of focal length 2 5 m. (a) Name the defect of vision he is suffering from. (b) Which lens is used for the correction of this defect ? (c) List two main causes of developing this defect. (d) Compute the power of this lens. OR Give reasons : (a) Red colour is selected for danger signals. (b) The sky appears dark in space. (c) The time difference between actual sunset and apparent sunset is about 2 minutes. .31/5/1 17 3 3 3 P.T.O. I S> J 25. Xmo A` H$ X Am a Y {bE JE & BZ A` H$m| H$mo J_ H$aZo na `h nm`m J`m {H$ (a) A` H$ X go CO2 J g {ZH$bVr h , VWm (b) A` H$ Y go SO2 J g {ZH$bVr h & hmoZo dmbr A{^{H $`mAmo Ho$ amgm`{ZH$ g_rH$aU XoVo h E BZ A` H$mo| H$mo YmVwAm| _| n[ad{V V H$aZo Ho$ MaUm| H$mo {b{IE & 5 AWdm 26. 27. (a) {d wV -AnKQ>Z mam H$m na Ho$ n[a H$aU H$s {d{Y H$s `m `m AmaoI H$s ghm`Vm go H$s{OE & (b) Qy>Q>r h B aob H$s nQ>[a`m| H$mo {H$g H$ma Omo S>m OmVm h ? Bg {H $`m H$m Zm_ VWm hmoZo dmbr A{^{H $`m H$m amgm`{ZH$ g_rH$aU Xr{OE & (a) g_md`dVm H$s n[a^mfm Xr{OE & `yQ>oZ Ho$ g^r g ^m{dV g_md`d It{ME & (b) H$moB `m {JH$ X XhZ hmoZo na A `{YH$ YwE Ho$ gmW nrbr dmbm XoVm h & Bg H$WZ go Amn `m {Z H$f {ZH$mbVo h ? (c) {H$gr Eo H$mohm b H$mo VXZw $nr H$m~m}p g{bH$ A b _| n[ad{V V H$aZo H$s A{^{H $`m _| jmar` KMnO4 H$s ^y{_H$m H$m C oI H$s{OE & H$maU Xr{OE 5 : (a) A{b X H$s VwbZm _| {Zb` H$s noer` {^{ m`m _moQ>r hmoVr h & (b) nm Ym| _| n[adhZ {ZH$m` Yr_m hmoVm h & (c) Obr` H$eo {H$`m| _ o {Ya n[ag MaU Wbr` H$eo {H$`m| _| {Ya n[ag MaU go {^ hmoVm h & (d) {XZ _| OmBb_ _| Ob Am a I{ZOm| H$s J{V am{ H$s VwbZm _| A{YH$ hmoVr h & (e) {eamAm| _| dm d hmoVo h O~{H$ Y_{Z`m| _| Zht hmoVo & .31/5/1 5 18 5 SECTION C 25. Two ores X and Y were taken. On heating these ores it was observed that (a) ore X gives CO2 gas, and (b) ore Y gives SO2 gas. Write steps to convert these ores into metals, giving chemical equations of the reactions that take place. 5 OR (a) With the help of a diagram explain the method of refining of copper by electrolysis. (b) How are broken railway tracks joined ? Give the name of the process and the chemical equation of the reaction involved. 26. 5 (a) Define isomerism. Draw all possible isomers of butane. (b) A compound X on combustion gives a yellow flame with lots of smoke. What inference would you draw from this statement ? (c) State the role of alkaline KMnO4 in the reaction involving conversion of an alcohol to corresponding carboxylic acid. 27. 5 Give reasons : (a) Ventricles have thicker muscular walls than atria. (b) Transport system in plants is slow. (c) Circulation of blood in aquatic vertebrates differs from that in terrestrial vertebrates. (d) During the daytime, water and minerals travel faster through xylem as compared to the night. (e) .31/5/1 Veins have valves whereas arteries do not. 19 5 P.T.O. 28. {XE JE AmaoI Ho$ AmYma na ZrMo {XE JE Zm| Ho$ C ma Xr{OE : B A _y me` D C d fU (a) (b) (c) ^mJ A, B, C Am a D H$m Zm_m H$Z H$s{OE & d fU mam m{dV hm _m}Z H$m Zm_ {b{IE Am a BgH$s ^y{_H$m H$m C boI H$s{OE & OZZ {H $`m _| B Am a C Ho$ H$m`m] H$m C oI H$s{OE & AWdm (a) {Z Z{b{IV Ordm| Ho$ OZZ H$s {dYmAm| Ho$ Zm_ {b{IE Am a n `oH$ {dYm H$s _h dnyU {deofVm H$m C oI H$s{OE : (i) boZo[a`m (ii) hmBS >m (iii) amB Omong (b) h_ ~ m`mo{\$b_ H$s n{ m`m| go ZE nm Yo m H$a gH$Vo h & {Q> nUr H$s{OE & (c) OZZ H$s A ` {dYmAm| H$s VwbZm _| H$m{`H$ dY Z Ho$ Xmo bm^m| H$s gyMr ~ZmBE & .31/5/1 20 5 5 28. Based on the given diagram answer the questions given below : B A Bladder D C Testis (a) Label the parts A, B, C and D. (b) Name the hormone secreted by testis and mention its role. (c) State the functions of B and C in the process of reproduction. 5 OR (a) Name the mode of reproduction of the following organisms and state the important feature of each mode : (i) Planaria (ii) Hydra (iii) Rhizopus (b) We can develop new plants from the leaves of Bryophyllum. Comment. (c) List two advantages of vegetative propagation over other modes of reproduction. .31/5/1 21 5 P.T.O. 29. (a) (b) 30. 100 W, 220 V VWm 10 W, 220 V AZw_Vm H$ Ho$ Xmo b n 220 V H$s Amny{V go nm d _| g `mo{OV h & Bg n[anW go dm{hV Hw$b Ymam n[aH${bV H$s{OE & Xmo {VamoYH$m| X Am a Y, {OZHo$ {VamoY H $_e: 2 Am a 3 h , H$mo nhbo nm d _| Am a {\$a loUr _| g `mo{OV {H$`m J`m h & `oH$ H$aU _| Amny{V H$s dmo Q>Vm 5 V h & (i) `oH$ H$aU _| {VamoYH$m| Ho$ g `moOZ H$mo Xem Zo Ho$ {bE n[anW AmaoI It{ME & (ii) {VamoYH$m| Ho$ loUr g `moOZ _| 3 Ho$ {VamoYH$ Ho$ {gam| na dmo Q>Vm n[aH${bV H$s{OE & (a) {H$gr H$m M Ho$ b ~ Ho$ {H$gr \$bH$ na {V` H$ {Xem _| Amn{VV {H$gr H$me {H$aU H$m nW Xem Zo Ho$ {bE Zm_m {H$V {H$aU AmaoI It{ME & (b) H$m M Ho$ b ~ Ho$ nXmW H$m AndV Zm H$ n[aH${bV H$s{OE & {X`m J`m h : H$m M Ho$ b ~ _| H$me H$s Mmb 2 108 m/s VWm dm`w _| H$me H$s Mmb 3 108 m/s h & (c) `{X {H$gr b|g H$s e{ $ 2 5 D h , Vmo CgH$s \$moH$g X ar n[aH${bV H$s{OE & 5 5 AWdm (a) {ZH$Q>- { > Xmof go nr{ S>V {H$gr `{ $ H$mo 2 5 D j_Vm Ho$ g emoYH$ b|g H$m M _m nhZZo H$m gwPmd {X`m J`m & Bgr \$moH$g X ar Ho$ {H$gr Jmobr` b|g H$mo `moJembm _| bm`m J`m & H$moB N>m Bg b|g go {H$gr {~ ~ H$mo {H$VZr X ar na aIo Vm{H$ Cg {~ ~ H$m {V{~ ~ b|g go 10 cm X ar na ~Zo ? (b) Cn`w $ H$aU _| ~Zo {V{~ ~ H$s p W{V Am a H ${V H$mo Xem Zo Ho$ {bE {H$aU AmaoI It{ME & .31/5/1 22 5 29. 30. (a) Two lamps rated 100 W, 220 V and 10 W, 220 V are connected in parallel to 220 V supply. Calculate the total current through the circuit. (b) Two resistors X and Y of resistances 2 and 3 respectively are first joined in parallel and then in series. In each case the voltage supplied is 5 V. (i) Draw circuit diagrams to show the combination of resistors in each case. (ii) Calculate the voltage across the 3 resistor in the series combination of resistors. (a) Draw a labelled ray diagram to show the path of a ray of light incident obliquely on one face of a glass slab. (b) Calculate the refractive index of the material of a glass slab. Given that the speed of light through the glass slab is 2 108 m/s and in 5 air is 3 108 m/s. (c) Calculate the focal length of a lens, if its power is 2 5 D. OR (a) A person suffering from myopia (near-sightedness) was advised to wear corrective lens of power 2 5 D. A spherical lens of same focal length was taken in the laboratory. At what distance should a student place an object from this lens so that it forms an image at a distance of 10 cm from the lens ? (b) Draw a ray diagram to show the position and nature of the image formed in the above case. .31/5/1 23 5 5 P.T.O.

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