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CBSE Board Exam Class 10 2019 : Science (Series 3)

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

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SET-1 H$moS> Z . Series JMS/3 Code No. amob Z . 31/3/1 narjmWu H$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 > 11 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 _| >27 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 11 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 27 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. {dkmZ SCIENCE {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 80 Time allowed : 3 hours 31/3/1 Maximum Marks : 80 1 P.T.O. gm_m ` {ZX}e : (i) Bg Z-n H$mo nm M ^mJm|, A, ~, g, X Am a | ~m Q>m J m h & AmnH$mo g^r ^mJm| Ho$ Zm| Ho$ C ma {bIZo h & (ii) g^r Z A{Zdm` h & (iii) ^mJ ~, g, X Am a Ho$ Zm| | Am V[aH$ M Z {X m J m h & (iv) ^mJ A Ho$ Z g `m 1 Am a 2 EH$-EH$ A H$ Ho$ Z h & BZHo$ C ma EH$ e X AWdm EH$ dm ` _| XoZo h & (v) ^mJ ~ Ho$ Z g m 3 go 5 Xmo-Xmo A H$m| Ho$ Z h & BZHo$ C ma bJ^J 30 e Xm| `oH$ | XoZo h & (vi) ^mJ g Ho$ Z g m 6 go 15 VrZ-VrZ A H$m| Ho$ Z h & BZHo$ C ma bJ^J 50 e Xm| `oH$ | XoZo h & (vii) ^mJ X Ho$ Z g m 16 go 21 nm M-nm M A H$m| Ho$ Z h & BZHo$ C ma bJ^J 70 e Xm| `oH$ | XoZo h & (viii) ^mJ Ho$ Z g m 22 go 27 moJm H$ H$m eb na AmYm[aV Xmo-Xmo A H$m| Ho$ Z h & BZHo$ g {j V C ma XoZo h & General Instructions : (i) The question paper comprises five Sections, A, B, C, D and E. You are to attempt All the sections. (ii) All questions are compulsory. (iii) Internal choice is given in Sections B, C, D and E. (iv) Questions number 1 and 2 in Section A are one-mark questions. They are to be answered in one word or in one sentence. (v) Questions number 3 to 5 in Section B are two-marks questions. These are to be answered in about 30 words each. (vi) Questions number 6 to 15 in Section C are three-marks questions. These are to be answered in about 50 words each. (vii) Questions number 16 to 21 in Section D are five-marks questions. These are to be answered in about 70 words each. (viii) Questions number 22 to 27 in Section E are based on practical skills. Each question is a two-marks question. These are to be answered in brief. 31/3/1 2 ^mJ A SECTION A 1. 1 {H$gr nXmW H$s d wV {VamoYH$Vm H$s n[a^mfm {b{IE & Define the term electrical resistivity of a material. 2. 1 {H$gr nm[aV Ho$ Xmo n _wI KQ>H$m| H$s gyMr ~ZmBE & List two main components of an ecosystem. ^mJ ~ SECTION B 3. Am`Zr `m {JH$ `m hmooVo h ? Am`Zr `m {JH$ R>mog Ad Wm _| {d wV MmbZ `m| Zht H$aVo ? What are ionic compounds ? Why do ionic compounds not conduct electricity in the solid state ? 2 4. ghmao Ho$ Mmam| Amoa {H$gr VmZ H$s d { _| Am p gZ {H$g H$ma ghm`H$ hmoVo h ? AWdm V { H$m AmdoJ {H$go H$hVo h ? {H$gr Ord Ho$ eara _| J_Z H$aVo g_` {H$gr V { H$m AmdoJ H$s {Xem H$m C oI H$s{OE & 2 2 How do auxins promote the growth of a tendril around a support ? OR What is a nerve impulse ? State the direction followed by a nerve impulse while travelling in the body of an organism. 5. ? Why is the colour of the clear sky blue ? 2 d N> AmH$me H$m dU Zrbm `m| hmoVm h ^mJ g SECTION C 6. H+(aq) Am`Zm| H$s gm Vm Ho$ {db`Z H$s H ${V na ^md H$m C oI H$s{OE & `m jmar` {db`Zm| _| ^r H+(aq) Am`Z hmoVo h ? `{X Eogm h , Vmo {\$a `o jmar` `m| hmoVo h ? 3 + State the effect of concentration of H (aq) ions on the nature of the solution. Do basic solutions also have H+(aq) ions ? If yes, then why are these basic ? 31/3/1 3 P.T.O. 7. VrZ YmVwAm| P, Q Am a R _|, P H$s g{H $`Vm Q go H$_ h VWm R H$s g{H $`Vm P Am a Q XmoZm| go A{YH$ h & H$moB Eogm {H $`mH$bmn gwPmBE {OgHo$ mam P, Q Am a R H$mo BZH$s KQ>Vr h B g{H $`Vm Ho$ H $_ _| `dp WV {H$`m Om gH$Vm h & AWdm _H $ar Ho$ A` H$ H$m Zm_ {b{IE & g Vw{bV amgm`{ZH$ g_rH$aUm| H$s ghm`Vm go _H $ar H$mo CgHo$ A` H$ go {Z H${f V H$aZo H$s {H $`m H$s `m `m H$s{OE & 3 3 Out of three metals P, Q and R, P is less reactive than Q and R is more reactive than P and Q both. Suggest an activity to arrange P, Q and R in order of their decreasing reactivity. OR Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore. 8. {H$gr agm`Zem r Ho$ {bE {H$gr V d H$m na_mUw H $_m H$ Cg V d Ho$ na_mUw `_mZ H$s VwbZm _| A{YH$ Cn`w $ mMb _mZm OmVm h & V d X (na_mUw H $_m H$ 13) H$m 3 CXmhaU boH$a Bg H$WZ H$s nwp Q> H$s{OE & Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist. Take the example of the element X (atomic number 13) to justify this statement. 9. _mZd X` Ho$ Mma H$m`m o H$s gyMr ~ZmBE & _mZd eara _| Xmoham n[ag MaU `m| Amd `H$ h ? 3 List four functions of the human heart. Why is double circulation necessary in the human body ? 10. Am grOZ H$s AZwnp W{V AWdm H$_r _| byH$mo O Ho$ {dI S>Z Ho$ nWm| H$s `m `m H$s{OE & 3 Explain the ways in which glucose is broken down in absence or shortage of oxygen. 11. Vm{bH$m Ho$ $n _| _p V H$ Am a AZw_p V H$ Ho$ ~rM VrZ {d^oXZH$mar bjUm| H$s gyMr ~ZmBE & 3 List in tabular form three distinguishing features between cerebrum and cerebellum. 12. 3 {Z Z{b{IV H$s `m `m H$s{OE : (a) Om{V-CX ^dZ (b) mH ${VH$ M`Z AWdm 31/3/1 4 _|S>b Zo _Q>a Ho$ nm Ym| Ho$ gmW {H$E JE `moJm| _| go EH$ `mo J _| Jmob ~rO dmbo Am a PwauXma ~rO dmbo _Q>a Ho$ nm Ym| H$s {d{^ {H$ _m| H$m g H$aU H$am`m & Bg g H$aU mam F1 Am a F2 nr T>r _| m nm Ym| Ho$ _o S>b Ho$ ojUm| H$m H$maU g{hV C oI H$s{OE & Jmob ~rO Ho$ A{V[a $ _o S>b mam AnZo `moJ _| Cn`moJ {H$E JE {H$ ht Xmo {dn`m gr ({dH$ nr) bjUm| dmbo _Q>a Ho$ nm Ym| H$s gyMr ^r ~ZmBE & 3 Explain the following : (a) Speciation (b) Natural Selection OR Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel s observations giving reasons of F1 and F2 progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments. 13. n`m daUr` AndV Z {H$go H$hVo h ? Zm_m {H$V AmaoI H$s ghm`Vm go `m `m H$s{OE {H$ AmH$me _| {XImB XoZo dmbo {H$gr Vmao H$s p W{V CgH$s dm V{dH$ p W{V Zht hmoVr h & AWdm H$jm _| ~ R>o {H$gr N>m H$mo `h h_ H$~ H$hVo h {H$ dh {ZH$Q>- p Q> Xmof go nr{ S>V h ? Bg Xmof Ho$ Xmo H$maUm| H$s gyMr ~ZmBE & {H$aU AmaoI H$m Cn`moJ H$aHo$ Zo Ho$ Bg Xmof Ho$ g emoYZ Ho$ Cnm` H$s `m `m H$s{OE & 3 3 What is atmospheric refraction ? Explain with the help of a labelled diagram that the position of a star as seen by us is not its true position. OR When do we consider a student sitting in the class to be myopic ? List two causes of this defect. Explain using a ray diagram how this defect of eye can be corrected. 14. CZ Xmo D$Om moVm| H$s gyMr ~ZmBE {O h| Amn ZdrH$aUr` _mZVo h & AnZo M`Zm| H$s nwp Q> H$s{OE & `m `o D$Om moV X fU _w $ hmo gH$Vo h ? AnZo C ma H$s nwp Q> Ho$ {bE Xmo H$maUm| H$s gyMr ~ZmBE &$ 3 Name two energy sources that you would consider to be renewable. Give justification for your choices. Can these energy sources be pollution free ? List two reasons in support of your answer. 15. dZm| H$mo O d {d{dYVm H$m {d{e Q> Wb `m| _mZm OmVm h Mma Cnm` gwPmBE & ? dZm| Ho$ g ajU Ho$ {bE 3 Why are forests considered biodiversity hot spots ? Suggest four approaches towards the conservation of forests. 31/3/1 5 P.T.O. ^mJ X SECTION D 16. (a) (b) (a) (b) (c) (a) (b) (a) (b) (c) 17. (a) (b) (a) (b) 31/3/1 { {d WmnZ A{^{H $`m {H$go H$hVo h ? {H$gr CXmhaU g{hV `m `m H$s{OE & {H$gr ~rH$a _| Hw$N> Ob boH$a Cg_| {~Zm ~wPo MyZo H$s Hw$N> _m m {_bmB J`r h & (i) hmoZo dmbr A{^{H $`m H$m Zm_ Am a CgH$s n[a^mfm {b{IE & (ii) Cn`w $ A{^{H $`m H$m g Vw{bV amgm`{ZH$ g_rH$aU Am a ~ZZo dmbo C nmX H$m amgm`{ZH$ Zm_ {b{IE & (iii) Bg A{^{H $`m Ho$ Xmo _wI ojUm| H$s gyMr ~ZmBE & AWdm boS> ZmBQ >oQ> H$s AnKQ>Z ({d`moOZ) A{^{H $`m H$mo {ZX{e V H$aZo Ho$ {bE {H$gr {H $`mH$bmn H$s A{^H$ nZm H$s{OE & m`mo{JH$ `d Wm H$m Zm_m {H$V AmaoI ItMH$a Xmo _wI ojUm| H$s gyMr ~ZmBE & A{^H$_ H$ Am a C nmXm| H$s ^m {VH$ Ad Wm H$m C oI H$aVo h E hmoZo dmbr A{^{H $`m H$m g Vw{bV amgm`{ZH$ g_rH$a m {b{IE & 5 5 What is a double displacement reaction ? Explain with an example. A small amount of quick lime is added to water in a beaker. (i) Name and define the type of reaction that has taken place. (ii) Write balanced chemical equation for the above reaction and the chemical name of the product formed. (iii) List two main observations of this reaction. OR Design an activity to demonstrate the decomposition reaction of lead nitrate. Draw labelled diagram of the experimental set-up. List two main observations. Write balanced chemical equation for the reaction stating the physical state of the reactant and the products. `oH$ Ho$ {bE amgm`{ZH$ g_rH$aU {bIH$a E Q>arH$aU Am a gm~wZrH$aU A{^{H $`mAm| Ho$ ~rM {d^oXZ H$s{OE & {d mb` H$s `moJembm _| {H$gr E Q>a H$m ~ZZm Xem Zo Ho$ {bE H$moB {H $`mH$bmn {b{IE & Distinguish between esterification and saponification reactions with the help of chemical equation for each. Write an activity to show the formation of an ester in a school laboratory. 6 5 18. (a) (b) (a) (b) (a) (b) (a) (b) 19. 20. (a) (b) OZZ {H$go H$hVo h ? BgHo$ Xmo H$mam| H$s gyMr ~ZmBE & EH$H$mo{eH$s` Ordm| Am a ~h H$mo{eH$s` Ordm| _| OZZ H$s {dYmE {H$g H$ma {^ hmoVr h ? AWdm b {JH$ g M[aV amoJ (STD) `m hmoVo h ? Xmo OrdmUw O{ZV Am a Xmo dm`ag g H ${_V b {JH$ g M[aV amoJm| H$s gyMr ~ZmBE & J^ {ZamoY {H$go H$hVo h ? J^ {ZamoYH$ Cnm`m| H$mo AnZmZo Ho$ VrZ H$maUm| H$s gyMr ~ZmBE & g_Vb Xn Um| mam ~Zo {V{~ ~m| Ho$ Mma A{^bjUm o H$s gyMr ~ZmBE & H$moB 5 cm D $Mm {~ ~ 30 cm \$moH$g X ar Ho$ {H$gr AdVb Xn U go 20 cm X ar na p WV h & Xn U gy H$m Cn`moJ H$aHo$ ~ZZo dmbo {V{~ ~ H$s p W{V Am a gmB O {ZYm [aV H$s{OE & List four characteristics of the images formed by plane mirrors. A 5 cm tall object is placed at a distance of 20 cm from a concave mirror of focal length 30 cm. Use mirror formula to determine the position and size of the image formed. (a) R1, R2 (a) (b) 31/3/1 5 What is reproduction ? List its two types. How are the modes of reproduction different in unicellular and multicellular organisms ? OR What are Sexually Transmitted Diseases (STD) ? List two viral and two bacterial STDs. What is contraception ? List three reasons for adopting contraceptive methods. (a) (b) (b) 5 Am a R3 {VamoYm| Ho$ VrZ {VamoYH$ (i) loUrH $_ _|, VWm (ii) nm d H $_ _| g `mo{OV h & `oH$ H$aU _| g `moOZ Ho$ Vw ` {VamoY Ho$ {bE ` OH$ {b{IE & 12 Ho$ Xmo gd g_ {VamoYH$ 3 V H$s {H$gr ~ Q>ar go g `mo{OV h & {Z ZV_ {VamoY Am a A{YH$V_ {VamoY Ho$ n[aUm_r g `moOZm| mam Cn^w $ e{ $`m| H$m AZwnmV n[aH${bV H$s{OE & AWdm b ~mB l Am a AZw W-H$mQ> jo \$b A Ho$ ~obZmH$ma AmH ${V Ho$ {H$gr MmbH$ Ho$ {VamoY Am a CgHo$ nXmW H$s d wV {VamoYH$Vm Ho$ ~rM g ~ Y {b{IE & Bg H$ma d wV {VamoYH$Vm H$m S.I. _m H$ `w n H$s{OE & 5 m b ~o {H$gr YmVw Ho$ Vma H$m {VamoY 100 h & `{X Bg Vma H$s AZw W-H$mQ> H$m jo \$b 3 10 7 m2 h , Vmo YmVw H$s {VamoYH$Vm n[aH${bV H$s{OE & 7 5 5 5 P.T.O. (a) Three resistors of resistances R1, R2 and R3 are connected (i) in series, and (ii) in parallel. Write expressions for the equivalent resistance of the combination in each case. (b) Two identical resistors of 12 each are connected to a battery of 3 V. Calculate the ratio of the power consumed by the resulting combinations with minimum resistance and maximum resistance. OR (a) (b) 21. (a) (b) (a) (b) Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of a cylinder of length l and area of cross-section A . Hence derive the S.I. unit of electrical resistivity. Resistance of a metal wire of length 5 m is 100 . If the area of cross-section of the wire is 3 10 7 m2, calculate the resistivity of the metal. {H$gr EH$g_mZ Mw ~H$s` jo _| jo Ho$ b ~dV p WV Ymamdmhr grYo MmbH$ mam AZw^d {H$E OmZo dmbo ~b H$s {Xem {ZYm [aV H$aZo dmbo {Z`_ H$m Zm_ Am a {Z`_ {b{IE & {d wV _moQ>a H$m Zm_m {H$V AmaoI It{ME & 5 Name and state the rule to determine the direction of force experienced by a current carrying straight conductor placed in a uniform magnetic field which is perpendicular to it. Draw a labelled diagram of an electric motor. ^mJ ` SECTION E 22. Xmo ~rH$am| _| \o$ag g \o$Q> Ho$ {db`Z ^ao h Am a BZ_| EH$ _| H$m na H$s n r Am a X gao _| Eobw{_{Z`_ H$s n r S>mbZo Ho$ bJ^J 1 K Q>o Ho$ n MmV `m ojU hm|oJo ? `{X a J _| H$moB n[adV Z nm`m OmVm h , Vmo hmoZo dmbr A{^{H $`m H$m Zm_ VWm A{^{H $`m H$m amgm`{ZH$ g_rH$aU ^r {b{IE & AWdm H$moB N>m \o$ag g \o$Q> {H $ Q>b boH$a {dI S>Z ({d`moOZ) A{^{H $`m H$m A ``Z H$aZm MmhVm h & Bg `moJ H$mo H$aVo g_` CgHo$ mam ~aVr OmZo dmbr Xmo gmdYm{Z`m {b{IE & 31/3/1 8 2 2 What is observed after about 1 hour of adding the strips of copper and aluminium separately to ferrous sulphate solution filled in two beakers ? Name the reaction if any change in colour is noticed. Also, write chemical equation for the reaction. OR A student wants to study a decomposition reaction by taking ferrous sulphate crystals. Write two precautions he must observe while performing the experiment. 23. EWoZm BH$ A b Ho$ ZrMo {XE JE JwUY_m o H$m A ``Z H$aVo g_` Amn Omo {Z H$f {ZH$mb|Jo CZH$s gyMr ~ZmBE : (a) J Y (b) Ob _| {dbo`Vm (c) {bQ>_g n na ^md (d) gmo{S>`_ hmBS >moOZ H$m~m oZoQ> Ho$ gmW A{^{H $`m 2 List the conclusions you will draw while studying the following properties of ethanoic acid : 24. (a) Odour (b) Solubility in water (c) Effect on litmus paper (d) Reaction with sodium hydrogen carbonate {H$gr N>m Zo dgZ H$s Ad{Y _| CO2 {ZH$bVr h H$mo Xem Zo Ho$ {bE CnH$aU `dp WV H$a {b`m h & bJ^J 1 K Q>o Ho$ n MmV dh {ZH$mg Zbr _| Ob Ho$ Vb _| H$moB A Va Zht nmVm & `moJ H$s Ag\$bVm Ho$ Xmo g ^m{dV H$maU {b{IE & 2 A student has set up an apparatus to show that CO2 is released during respiration . After about 1 hour he observes no change in the water level in the delivery tube. Write two possible reasons for the failure of the experiment. 31/3/1 9 P.T.O. 25. a Y m| H$m ojU H$aZo Ho$ {bE n mr Ho$ {N>bHo$ H$m A Wm`r AmamonU V `ma H$aZo Ho$ `moJ _| h_ Ob Ho$ A{V[a $ Xmo A ` dm| H$m Cn`mooJ H$aVo h & BZ dm| Ho$ Zm_ {b{IE Am a C oI H$s{OE {H$ `o d H$~ Am a `m| Cn`moJ {H$E OmVo h & 2 AWdm CZ Mma gmdYm{Z`m| H$s C{MV H $_ _| gyMr ~ZmBE {OZH$m nmbZ h_ n mr Ho$ {N>bHo$ H$m A Wm`r AmamonU V `ma H$aVo g_` H$aVo h & 2 In the experiment of preparing a temporary mount of a leaf peel to observe stomata, we use two liquids other than water. Name these two liquids and state when and why these liquids are used. OR List four precautions in proper sequence which we observe while preparing a temporary mount of a leaf peel. 26. {H$gr X a W {~ ~ H$m {V{~ ~ m H$aHo$ {XE JE AdVb Xn U H$s g{ H$Q> \$moH$g X ar {ZYm [aV H$aZo Ho$ `moJ H$mo H$aZo H$s {d{Y Ho$ MaUm| H$s H $_dma gyMr ~ZmBE & 2 AWdm {H$gr N>m H$mo AmnVZ H$moU Ho$ Mma {d{^ _mZm| Ho$ {bE H$m M Ho$ Am`VmH$ma b ~ go Jw OaZo dmbr H$me {H$aU H$m nW Amao{IV H$aZm h & (a) Bg `moJ H$s Xmo _h dnyU gmdYm{Z`m| H$s gyMr ~ZmBE & (b) Bg `moJ na AmYm[aV N>m mam {ZH$mbo JE Xmo {Z H$fm o H$s gyMr ~ZmBE & List in proper sequence the steps of the experiment for determining the approximate focal length of a given concave mirror by obtaining the image of a distant object. OR A student has to trace the path of a ray of light passing through a rectangular glass slab for four different values of angle of incidence. (a) (b) 31/3/1 Write two important precautions for this experiment. List two conclusions the student will draw based on his experiment. 10 2 27. AmaoI _| Xem E JE dmo Q>_rQ>a Ho$ n _mZo na {dMma H$s{OE Am a {Z Z{b{IV Zm| Ho$ C ma Xr{OE : (a) (b) (c) dmo Q>_rQ>a H$m A nV_m H$ `m h ? dmo Q>_rQ>a H$m nmR> m H$ `m h ? `{X `h dmo Q>_rQ>a {H$gr 20 Ho$ {VamoYH$ Ho$ {gam| go g `mo{OV h , Vmo {VamoYH$ go {H$VZr Ymam dm{hV hmo ahr h ? 2 Consider the scale of a voltmeter shown in the diagram and answer the following questions : (a) What is the least count of the voltmeter ? (b) What is the reading shown by the voltmeter ? (c) If this voltmeter is connected across a resistor of 20 , how much current is flowing through the resistor ? 31/3/1 11 P.T.O.

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