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CBSE Class X 2014 : SCIENCE

23 pages, 108 questions, 30 questions with responses, 37 total responses,

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

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H$moS> Z . Series HRS/2 Code No. amob Z . 31/2/1 narjmWu H$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 > 23 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 23 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 31/2/1 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) AmnH$mo ^mJ A Am a ^mJ ~ Ho$ g^r Zm| Ho$ C ma n WH $-n WH $ ^mJ Ho$ AmYma na {bIZo hm|Jo & (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 30-30 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 50-50 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 70-70 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. 31/2/1 2 ^mJ A SECTION A 1. 1 V dm| Ho$ dJuH$aU H$m AmYw{ZH$ AmdV {Z`_ {b{IE & State the modern periodic law of classification of elements. 2. {H$gr nrer O _| g^r {d{^ VmAm| Ho$, C maOr{dVm Ho$ {bE g_mZ g `moJ Zht hmoVo & Eogm `m| ? 1 All the variations in a species do not have equal chances of survival. Why ? 3. 1 ~m Ym| H$m {Z_m U H$aZo Ho$ Xmo bm^m| H$s gyMr ~ZmBE & List two advantages of building dams. 4. b _mo{S>`_ Am a bre_ {Z`m {H$g H$ma OZZ H$aVo h A Va {b{IE & ? BZH$s OZZ H$s {d{Y`m| _| EH$ 2 How do Plasmodium and Leishmania reproduce ? Write one difference in their mode of reproduction. 5. {H$gr Jmobr` Xn U mam C n a {IH$ AmdY Z + 1 3 h & Bg _mZ H$m {d bofU H$aHo$ (i) Xn U Ho$ H$ma VWm (ii) Xn U Ho$ Y wd Ho$ gmnoj {~ ~ H$s p W{V H$m C oI H$s{OE & AnZo C ma H$s nw{ > Ho$ {bE {H$aU AmaoI It{ME & 2 1 . Analysing 3 this value state the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror. Draw ray diagram to justify your answer. The linear magnification produced by a spherical mirror is + 6. h_ m` Kaoby An{e >m| H$mo Amdmgr` H$m bmo{Z`m| H$s J{b`m| _| AnK{Q>V hmoVo h E XoIVo h & Eogo Cnm` gwPmBE {OZHo$ mam dhm Ho$ {Zdm{g`m| H$mo `h AZw^y{V hmo {H$ CZH$m AZw{MV T> J go An{e >m| H$m {ZnQ>mam H$aZm n`m daU Ho$ {bE hm{ZH$a h & 2 We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make the residents realise that the improper disposal of their waste is harmful to the environment. 7. Ordm _r B YZm| Ho$ XhZ go C n hmoZo dmbo, H$m~ Z S>mBAm gmBS> Ho$ A{V[a $ A ` Xmo C nmXm| H$s gyMr ~ZmBE & O~ BZ B YZm| H$m XhZ An`m dm`w _| {H$`m OmVm h , Vmo `m hmoVm h ? {H$gr EH$ J rZ hmCg (nm YmKa) J g H$m Zm_ {b{IE & 2 List two products of combustion of fossil fuels other than carbon dioxide. What happens when combustion takes place in insufficient air ? Name a green house gas. 31/2/1 3 P.T.O. 8. g_md`d `m hmoVo h ? Eo Ho$Z loUr Ho$ nhbo VrZ gX `m| Ho$ g_md`d `m| Zht hmo gH$Vo `yQ>oZ, C4H10 Ho$ g ^m{dV g_md`dm| H$s g aMZmAm| Ho$ AmaoI ~ZmBE & ? 3 What are isomers ? Why can t we have isomers of first three members of alkane series ? Draw the possible structures of isomers of butane, C4H10. 9. `h Xem Zo Ho$ {bE {H$ O~-O~ {Z Z{b{IV hmoVo h , Vmo `m hmoVm h , CZHo$ amgm`{ZH$ g_rH$aU {b{IE : (i) (ii) (iii) H$moB E Q>a {H$gr jma go A{^{H $`m H$aVm h & _oW Z gy` Ho$ H$me _| bmoarZ Ho$ gmW A{^{H $`m H$aVr h & g `y[aH$ A b H$s Cnp W{V _| EWoZm b, EWoZm BH$ A b go A{^{H $`m H$aVm h & 3 Write the chemical equations to show what happens when (i) (ii) methane is treated with chlorine in the presence of sunlight ? (iii) 10. an ester reacts with a base ? ethanol reacts with ethanoic acid in the presence of sulphuric acid ? {Z Z{b{IV gmaUr H$m A ``Z H$s{OE {Og_| N> V dm| A, p W{V`m AmYw{ZH$ AmdV gmaUr _| Xem E AZwgma Xr JB h : g_yh AmdV 1 2 3 2 3 12 13 14 B, C, D, E 15 16 A B D E : H$s 18 C 3 (i) Cg V d H$m Zm_ {b{IE Omo Ho$db ghg `moOH$ `m {JH$ ~ZmEJm & (ii) H$m Z-gm V d YmVw h {OgH$s g `moOH$Vm EH$ h (iii) H$m Z-gm V d AYmVw h {OgH$s g `moOH$Vm Xmo$ h (iv) D Am a E _ o go {H$g na_mUw H$s { `m ~ S>r h Am a `m| (v) B Am a D Ho$ g `moOZ go ~Zo `m {JH$ H$m gy {b{IE & 4 F F Cn`w $ gmaUr Ho$ AmYma na {Z Z{b{IV Zm| Ho$ C ma Xr{OE 31/2/1 17 Am a ? ? ? 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 3 A B D E C F On the basis of the above table, answer the following questions : (i) (ii) Which element is a metal with valency one ? (iii) Which element is a non-metal with valency two ? (iv) Out of D and E, which has a bigger atomic radius and why ? (v) 11. Name the element which will form only covalent compounds. Write the formula of the compound formed when B combines with D. AmdV gmaUr _| g_yh Am a AmdV `m hmoVo h ? Xmo V d X VWm Y AmdV gmaUr Ho$ H $_e g_yh 1 Am a g_yh 2 Ho$ gX ` h , na Vw CZHo$ AmdV g_mZ h & X VWm Y Ho$ {Z Z{b{IV JwUY_m] _| {H$g H$ma n[adV Z hm|Jo ? (i) BZHo$ na_mUw H$m gmB O (ii) BZHo$ Ymp dH$ JwU (iii) Am gmBS>m| Ho$ ~ZZo _| BZH$s g `moOH$VmE (iv) BZHo$ bmoamBS>m| Ho$ Amp dH$ gy 3 What are groups and periods in the periodic table ? Two elements X and Y belong to group 1 and 2 respectively and are in the same period of the periodic table. How do the following properties of X and Y vary ? (i) (ii) Their metallic character (iii) Their valencies in forming oxides (iv) 12. Size of their atom Molecular formula of their chlorides {H$gr C^`qbJr nw n Ho$ _mXm OZZm J Ho$ {d{^ ^mJm| Ho$ H$m` H$m g jon _| dU Z H$s{OE & 3 Describe in brief the function of the various parts of the female reproductive part of a bisexual flower. 31/2/1 5 P.T.O. 13. A Q >mgmC S> p b{ZH$m| Ho$ Zmo{Q>g ~moS> na gm_m `V `h {bIm hmoVm h , `hm gd-nyd qbJ (n Xm hmoZo go nyd b S>H$m `m b S>H$s) H$s nhMmZ Zht H$s OmVr & Eogm H$aZm {Z{f h Am a `h X S>Zr` AnamY h & (a) gd-nyd ^ yU qbJ {ZYm aU na H$mZyZr {V~ Y bJmZo Ho$ Xmo bm^m| H$s gyMr ~ZmBE & (b) g_mO H$mo {Z Z{b{IV Ho$ {df` _| {e{jV H$aZo Ho$ {bE N>m `m H$a gH$Vo h ? (i) A YmYw Y _mXm ^ yU h `m Ho$ X n[aUm_ (ii) N>moQ>m n[adma AnZmZo Ho$ _mZX S> 3 On the notice board of ultrasound clinics it is generally stated. Here prenatal sex determination and disclosure of sex (boy or girl before birth) of foetus is not done. It is prohibited and punishable under law. (a) List two advantages determination. of imposing ban on prenatal (b) What can students do to educate the society about the following ? (i) 14. The ill-effects of indiscriminate female foeticide (ii) sex Adopting small family norms Ho$db EH$ gw n > {dn`m gr ({dH$ nr) bjU na {dMma H$aVo h E _Q>a Ho$ nm Ym| Ho$ gmW bjUm| H$s AmZwd {eH$Vm H$m _|S>b mam {H$`m J`m `moJ g_PmBE & 3 Explain Mendel s experiment with peas on inheritance of characters, considering only one visible contrasting character. 15. `oH$ H$m EH$-EH$ CXmhaU XoVo h E, AmZwd {eH$ Am a Cnm{O V bjUm| _| {d^oXZ H$s{OE & H$maU Xr{OE {H$ {H$gr EH$b Ord mam AnZo OrdZ H$mb _| Cnm{O V bjU AJbr nr T>r _| d emZwJV `m| Zht hmoVo & 3 Distinguish between inherited and acquired traits by giving one example of each. Give reason why the traits acquired during the lifetime of an individual are not inherited. 16. H$moB N>m 12 cm \$moH$g X ar Ho$ AdVb Xn U mam {H$gr {~ ~ H$m grYm {V{~ ~ m H$aZm MmhVm h & BgHo$ {bE Xn U go {~ ~ H$s X ar H$m n[aga `m hmoZm Mm{hE ? CgHo$ mam ojU {H$E OmZo dmbo {V{~ ~ H$s H ${V Am a CgH$m gmB O `m hmoJm ? AnZo C ma H$s nw{ > Ho$ {bE EH$ {H$aU AmaoI It{ME & A student wants to obtain an erect image of an object using a concave mirror of 12 cm focal length. What should be the range of distance of the object from the mirror ? State the nature and size of the image he is likely to observe. Draw a ray diagram to justify your answer. 31/2/1 6 3 17. {H$gr Jmobr` b|g go 40 cm X ar na p WV _mo_~ mr H$s dmbm H$m {V{~ ~ b|g Ho$ X gar Amoa b|g go 40 cm X ar na ~ZVm h & Bg b|g Ho$ H$ma H$mo nhMm{ZE Am a BgH$s \$moH$g X ar H$m C oI H$s{OE & `{X _mo_~ mr H$s dmbm H$mo b|g H$s Amoa 25 cm {IgH$m`m OmE, Vmo ~ZZo dmbo {V{~ ~ H$s H ${V `m hmoJr ? AnZo C ma H$s nw{ > {H$aU AmaoI ItMH$a H$s{OE & 3 The image of a candle flame placed at a distance of 40 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 40 cm from the lens. Identify the type of lens and write its focal length. What will be the nature of the image formed if the candle flame is shifted 25 cm towards the lens ? Draw a ray diagram to justify your answer. 18. doV H$me Ho$ {djonU H$s n[a^mfm {b{IE & H$me Ho$ Cg a J H$m Zm_ {b{IE Omo H$m M Ho$ { _ go hmoH$a Jw OaZo na (i) A{YH$V_, (ii) `yZV_, _w S>Vm h & AnZo C ma H$s nw{ > Ho$ {bE {H$aU AmaoI It{ME & 3 Define the term dispersion of white light. Name the colour of light which bends (i) the most, (ii) the least, while passing through a glass prism. Draw a ray diagram to justify your answer. 19. Amhma m Ibm go `m Vm n` h ? Amhma m Ibm _| nmofr Vam| H$s g `m gr{_V hmoVr h & Bg H$WZ H$s nw{ > Ho$ {bE H$maU Xr{OE & 3 What is meant by food chain ? The number of trophic levels in a food chain is limited. Give reason to justify this statement. 20. hmBS >moH$m~ Z `m hmoVo h ? Eo Ho$Z H$m Eo H$sZ go {d^oXZ H$s{OE VWm BZ_| go `oH$ H$m Eo H$mBZ go EH$-EH$ CXmhaU XoH$a ^r {d^oXZ H$s{OE & {XE JE CXmhaU Ho$ `oH$ `m {JH$ H$s g aMZm H$m AmaoI ItMH$a AnZo C ma H$s nw{ > H$s{OE & 5 What are hydrocarbons ? Distinguish alkanes from alkenes and each of them from alkynes, giving one example of each. Draw the structure of each compound cited as example to justify your answer. 21. gmaUr~ $n _| b {JH$ OZZ Am a Ab {JH$ OZZ H$s {d{Y`m| Ho$ ~rM Xmo A Vam| H$s gyMr ~ZmBE & hmBS >m _| Ab {JH$ OZZ H$s {H $`m H$m Zm_ {b{IE Am a BgH$s `m `m Zm_m {H$V AmaoI H$s ghm`Vm go H$s{OE & 5 List in tabular form the two differences between asexual and sexual mode of reproduction. Name and explain with the help of labelled diagram the process by which Hydra reproduces asexually. 31/2/1 7 P.T.O. 22. (a) _mZd Za Ho$ Cg OZZm J H$m Zm_ {b{IE Omo ewH $mUwAm| H$m C nmXZ VWm hm _m}Zm| H$m mdU ^r H$aVm h & m{dV hm _m}Zm| Ho$ H$m` {b{IE & (b) _mZd _mXm OZZ V Ho$ Cg-Cg ^mJ H$m Zm_ {b{IE Ohm H $_e (i) {ZfoMZ VWm (ii) {Zfo{MV A S>o H$m AmamonU hmoVm h & ^ yU H$mo _mVm Ho$ eara Ho$ ^rVa nmofU {H$g H$ma m hmoVm h ? g_PmBE & (a) 23. Name the human male reproductive organ that produces sperms and also secretes hormones. Write the functions of the hormone secreted. (b) 5 Name the parts of the human female reproductive system where (i) fertilization and (ii) implantation occur respectively. Explain how the embryo gets nutrition inside the mother s body. {H$gr b|g H$s j_Vm go `m Vm n` h ? BgHo$ S.I. _m H$ H$m Zm_ Am a CgH$s n[a^mfm {b{IE & EH$ N>m +50 cm \$moH$g X ar H$m b|g Cn`moJ H$aVm h VWm X gam N>m 50 cm \$moH$g X ar H$m b|g Cn`moJ H$aVm h & `oH$ b|g H$s H ${V {b{IE Am a CgH$s j_Vm kmV H$s{OE & BZ XmoZm| _| go {H$g b|g mam {H$gr {~ ~ H$m {V{~ ~ gX d hr Am^mgr, grYm Am a gmB O _| N>moQ>m ~ZoJm Mmho {~ ~ b|g Ho$ gmnoj H$ht ^r p WV hmo ? 5 What is meant by power of a lens ? Name and define its S.I. unit. One student uses a lens of focal length +50 cm and another of 50 cm. State the nature and find the power of each lens. Which of the two lenses will always give a virtual, erect and diminished image irrespective of the position of the object ? 24. {ZH$Q> { > Xmof `m h ? Bg Xmof Ho$ C n hmoZo Ho$ Xmo H$maUm| H$s gyMr ~ZmBE & b|g H$m Cn`moJ H$aHo$ Bg Xmof H$m g emoYZ {H$g H$ma {H$`m Om gH$Vm h ? (i) Xmof`w $ Zo VWm (ii) g emo{YV Zo mam {V{~ ~ ~ZZm Xem Zo Ho$ {bE {H$aU AmaoI It{ME & What is myopia ? List two causes for the development of this defect. How can this defect be corrected using a lens ? Draw ray diagrams to show the image formation in case of (i) defective eye and (ii) corrected eye. 31/2/1 8 5 ^mJ ~ SECTION B 25. Mma N>m m| P, Q, R Am a S Zo EWoZm BH$ A b Ho$ JwUY_m] H$m A ``Z H$aHo$ AnZo ojUm| H$mo {Z Z{b{IV gmaUr _| ZmoQ> {H$`m : Ob _| {_lUr`Vm J Y N>m {gaHo$ g S>o A S>o nyU V Am {eH$ O gr O gr {_lUr` {_lUr` P Q R S BZ_| go {H$g N>m Ho$ ZmoQ> {H$E JE ojU ghr h (A) Q (C) R (D) 1 P (B) ? S Four students P, Q, R and S studied the properties of ethanoic acid and reported their observations in the following table : Miscibility with water Odour Student Like Vinegar Like rotten egg Fully miscible Partially miscible P Q R S The correctly reported observations are of (A) (B) Q (C) R (D) 31/2/1 P S 9 P.T.O. 26. H$moB N>m {H$gr ew H$ naIZbr _| gmo{S>`_ hmBS >moOZ H$m~m}ZoQ> Ho$ nmCS>a H$s Hw$N> _m m boH$a Cg na 4 5 ~y X EWoZm BH$ A b H$s S>mbVm h & dh `m ojU H$aVm h ? (ghr {dH$ n Mw{ZE) (A) Vr U J Y H$s EH$ a JhrZ J g {ZH$bVr h (B) a JhrZ Am a J YhrZ J g Ho$ ~wb~wbo {ZH$bVo h (C) Vrd ~wX~wXmhQ> Ho$ gmW ^yam YwAm {ZH$bVm h (D) a JhrZ J g {ZH$bVr h Omo ObVr {N>nQ>r nmg bmZo na nm n d{Z Ho$ gmW ObVr h 1 A student takes a small quantity of sodium hydrogen carbonate powder in a dry test tube and pours 4 5 drops of ethanoic acid over it. What will he observe ? (Select the right option) (A) (B) Evolution of brown fumes along with a brisk effervescence (D) 31/2/1 Bubbles of a colourless and odourless gas (C) 27. Evolution of a colourless gas with pungent smell Evolution of a colourless gas which burns with a pop sound when a burning splinter is brought near it O~ Amn {H$gr ~rH$a, {Og_| Ob h , _| gmo{S>`_ hmBS >m gmBS> H$m 20% Obr` {db`Z ~ZmVo h , V~ {db`Z ~ZmVo g_` Amn `m ojU ZmoQ> H$aVo h ? ZrMo {XE JE ojUm| _| go ghr ojU N>m {Q>E : I. gmo{S>`_ hmBS >m gmBS> Jw{Q>H$mAm|/nn{ S>`m| Ho$ $n _| h & II. `h Ob _| erK Kwb OmVm h & III. Ob _| gmo{S>`_ hmBS >m gmBS> {_bmZo Ho$ Vwa V n MmV O~ h_ ~rH$a H$mo ~mha go Ny>Vo h Vmo dh h_| R> S>m VrV hmoVm h & IV. O~ h_ Bg {db`Z _| bmb {bQ>_g nona Sw>~moVo h , Vmo dh Zrbm hmo OmVm 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 10 1 When you prepare 20% sodium hydroxide solution in a beaker containing water, then while preparing the solution you record certain observations. Select from the following the observations which are correct : I. II. It dissolves in water readily. III. The beaker appears cold when touched from outside immediately after adding sodium hydroxide to water. IV. When red litmus paper is dipped into the solution, it turns blue. (A) I, II and III (B) II, III and IV (C) III, IV and I (D) 28. Sodium hydroxide is in the form of pellets/flakes. I, II and IV gm~wZ ~ZmVo g_` h_ m` dZ n{V Vob Am a gmo{S>`_ hmBS >m gmBS> Ho$ A{^{H $`m {_lU _| Wmo S>r _m m _| gmYmaU Z_H$ {_bmVo h & gmYmaU Z_H$ {_bmZo H$m C o ` `m h ? (ghr {dH$ n Mw{ZE) (A) gm~wZ H$mo CXmgrZ ~ZmZm (B) gm~wZ H$s jmar` H ${V H$mo H$_ H$aZm (C) gm~wZ H$s g\$mB H$aZo H$s j_Vm _| d { H$aZm (D) 1 gm~wZ Ho$ AdjonU _| ghm`Vm H$aZm While preparing soap we generally add a small amount of common salt to the reaction mixture of vegetable oil and sodium hydroxide. The purpose of adding common salt is to (select the right option) (A) (B) reduce the basic nature of the soap (C) enhance the cleansing power of the soap (D) 31/2/1 make the soap neutral favour the precipitation of soap 11 P.T.O. 29. H$moB N>m Mma naIZ{b`m| P, Q, R VWm S _| `oH$ _| bJ^J 5 mL AmgwV Ob boVm h & dh naIZbr P _| Na2SO4, Q _| K2SO4, R _| CaSO4 Am a S _| MgSO4 H$s g_mZ _m m H$mo `oH$ _| KmobVm h & BgHo$ n MmV dh g^r naIZ{b`m| _| gm~wZ H$m gm {db`Z g_mZ _m m _| {_bmVm h & BZ naIZ{b`m| H$mo ^br-^m {V {hbmZo na, dh {H$Z naIZ{b`m| _| H$m\$s _m m _| PmJ H$m ojU H$aoJm ? (A) P Am a Q (B) Q Am a R (C) R Am a S (D) P, Q Am a S 1 A student takes about 5 mL distilled water in four test tubes marked P, Q, R and S. He dissolves in each test tube an equal amount of Na 2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. After that he adds equal amount of concentrated soap solution in each test tube. On shaking these test tubes well, he would observe a good amount of lather (foam) in the test tubes marked (A) P and Q (B) Q and R (C) R and S (D) P, Q and S 30. {H$gr N>m Zo ZrMo {M _| Xem E AZwgma nX} S na EH$ ^br-^m {V Xr X a W ^dZ H$m {V{~ ~ m H$aZo Ho$ {bE `w{ $ X H$m Cn`moJ {H$`m & `w{ $ X Ho$ {df` _| ghr H$WZ Mw{ZE : (A) (B) (C) (D) 31/2/1 `w{ $ `w{ $ `w{ $ `w{ $ X C mb b|g h {OgH$s \$moH$g X ar 10 cm h & X C mb Xn U h {OgH$s \$moH$g X ar 10 cm h & X AdVb Xn U h {OgH$s \$moH$g X ar 10 cm h & X C mb Xn U h {OgH$s dH $Vm { `m 10 cm h & 12 1 A student used a device X to obtain the image of a well illuminated distant building on a screen S as shown below in the diagram. Select the correct statement about the device X : (A) (B) The device X is a convex mirror of focal length 10 cm. (C) The device X is a concave mirror of focal length 10 cm. (D) 31. The device X is a convex lens of focal length 10 cm. The device X is a convex mirror of radius of curvature 10 cm. {H$gr N>m Zo C mb b|g mam nX} na gy` H$m A `{YH$ N>moQ>m {V{~ ~ m H$a {b`m h & b|g H$s \$moH$g X ar kmV H$aZo Ho$ {bE Cgo `m _mnZm Mm{hE ? (A) b|g Ho$ XmoZm| n >m| H$s dH $Vm (B) b|g H$m maH$ (C) b|g go nX} H$s X ar (D) 1 b|g Ho$ XmoZm| n >m| H$s dH $Vm { `m A student has obtained a highly diminished image of the Sun on a screen using a convex lens. In order to determine the focal length of the lens, what should he measure ? (A) (B) Aperture of the lens (C) Distance of the screen from the lens (D) 31/2/1 Curvature of two surfaces of the lens Radius of curvature of two surfaces of the lens 13 P.T.O. 32. H$moB N>m H$m M H$s Am`VmH$ma {g r go hmoH$a Jw OaZo dmbr {H$gr H$me {H$aU H$m nW Mma {d{^ _mZ Ho$ AmnVZ H$moUm| Ho$ {bE Amao{IV H$aVm h & dh {nZm| H$mo Jm S>Vo g_` Am a {d{^ H$moUm| H$s _mn boZo _| `Wmg ^d g^r gmdYm{Z`m ~aVVm h & BZ _mnm| H$m {d bofU H$aZo na g ^mdZm `h h {H$ dh {Z Z{b{IV {Z H$f {ZH$mbo : (A) (B) i= e< r i= e> r (C) (D) 1 i> e> r e> i> r A student traces the path of a ray of light through a rectangular glass slab for four different values of angle of incidence. He observes all possible precautions while fixing the pins and also while measuring different angles. On analysing the measurements he is likely to draw the following conclusion : (A) (B) i= e> r (C) i> e> r (D) 33. i= e< r e> i> r H$m M H$s Am`VmH$ma {g r go Jw OaZo dmbr H$me {H$aU H$m nW Amao{IV H$aZo Ho$ {bE AmnVZ H$moU Ho$ _mZm| Am a Xmo {nZm| Ho$ nmXm| Ho$ ~rM H$s X ar H$m g~go A N>m {dH$ n H$m Z-gm h ? (A) (30 , 45 , 60 ) Am a 2 cm (B) (30 , 45 , 60 ) Am a 8 cm (C) (25 , 50 , 75 ) Am a 6 cm (D) (25 , 50 , 75 ) Am a 12 cm For tracing the path of a ray of light through a rectangular glass slab, the best choice for the values of angle of incidence and the distance between the feet of the two pins is (A) (B) (30 , 45 , 60 ) and 8 cm (C) (25 , 50 , 75 ) and 6 cm (D) 31/2/1 (30 , 45 , 60 ) and 2 cm (25 , 50 , 75 ) and 12 cm 14 1 34. {Z Z{b{IV {M m| _| H$m M Ho$ { _ go hmoH$a Jw OaZo dmbr {H$gr H$me {H$aU Ho$ nW Ho$ AmaoIm| na {dMma H$s{OE & Cg AmaoI H$mo nhMm{ZE {Og_| {H$aU H$m ghr nW Amao{IV {H$`m J`m h & 1 (A) I (B) II (C) III (D) IV Consider the following traces of the path of a ray of light passing through a glass prism. Identify the diagram which shows the correct path of a ray of light. (A) (B) (C) (D) 31/2/1 I II III IV 15 P.T.O. 35. H$moB N>m AmnVZ H$moU Ho$ Mma {d{^ _mZm| Ho$ {bE H$m M Ho$ { _ go hmoH$a Jw OaZo dmbr {H$aU H$m nW Amao{IV H$aVm h & AmaoIm| H$m {d bofU H$aZo na `h g ^mdZm h {H$ dh `h {Z H$f {ZH$mbo {H$ {ZJ V {H$aU (A) gX d Amn{VV {H$aU Ho$ g_m Va hmoVr h (B) gX d Amn{VV {H$aU Ho$ b ~dV hmoVr h (C) gX d And{V V {H$aU Ho$ g_m Va hmoVr h (D) gX d Amn{VV {H$aU H$s {Xem go {H$gr H$moU na _w S> OmVr h 1 A student traces the path of a ray through a glass prism for four different values of angle of incidence. On analysing the diagrams he is likely to conclude that the emergent ray (A) (B) is always perpendicular to the incident ray (C) is always parallel to the refracted ray (D) 36. is always parallel to the incident ray always bends at an angle to the direction of incident ray {H$gr N>m H$mo {ejH$ Zo 12 cm \$moH$g X ar H$m C mb b|g {XE JE C mb b|g Ho$ H$aU _| {d{^ {~ ~ X [a`m| Ho$ {bE g JV {V{~ ~ X [a`m kmV H$aZm Zm_H$ `moJ H$aZo Ho$ {bE {X`m & Cg N>m Zo g^r g ^d gmdYm{Z`m ~aVVo h E ghr T> J go `moJ H$aHo$ AnZo ojU ZrMo {XE AZwgma gmaUr~ $n _| ZmoQ> {H$E & H $_ g `m {~ ~ X ar (cm) {V{~ ~ X ar (cm) 1 60 15 2 48 16 3 36 21 4 24 24 5 18 36 6 16 48 gmaUr H$s Om M H$aVo g_`, {ejH$ Zo `h {Q> nUr H$s {H$ BZ_| go EH$ ojU _| {V{~ ~ X ar ghr ( `mZnyd H$) ZmoQ> Zht H$s JB h & Cg ojU H$s H $_ g `m nhMm{ZE & (A) (B) 3 (C) 4 (D) 31/2/1 2 6 16 1 A student was given a convex lens of focal length 12 cm by his teacher to perform the experiment, To find the image distance for various object distances in case of given convex lens. He performed the experiment methodically observing all possible precautions and noted down his observations in tabular form as given below. S. No. Object distance (cm) Image distance (cm) 1 60 15 2 48 16 3 36 21 4 24 24 5 18 36 6 16 48 While checking, the teacher remarked that in one of the observations the image distance has not been recorded carefully. Identify the serial number of that observation. (A) (B) 3 (C) 4 (D) 31/2/1 2 6 17 P.T.O. 37. ZrMo {XE JE {M _| Xem B JB nm M Amn{VV {H$aUm| _| go do Xmo Amn{VV {H$aU| nhMm{ZE Omo AndV Z Ho$ {Z`_m| H$m nmbZ Zht H$a ahr h Am a Bg H$ma h_ CZH$m Cn`moJ C mb b|gm| mam {V{~ ~ ~ZZm Xem Zo Ho$ {bE Zht H$a gH$Vo h & (A) 2 Am a 3 (B) 2 Am a 4 (C) 2 Am a 5 (D) 3 Am a 5 Out of the five incident rays shown in the following diagram, identify the two rays that are not obeying the laws of refraction and as such we cannot use them for illustrating the image formation by convex lenses. (A) (B) 2 and 4 (C) 2 and 5 (D) 31/2/1 2 and 3 3 and 5 18 1 38. A_r~m _| { I S>Z Ho$ {d{^ MaUm| H$mo Xem Zo dmbr ~h V gr bmBS>m| H$m ojU H$aZo Ho$ n MmV {H$gr N>m Zo {Z Z{b{IV AmaoI ItMo & na Vw, BZ AmaoIm| _| MaUm| H$m H $_ ghr Zht h & 1 Cn`w $ MaUm| H$m ghr H $_ nhMm{ZE & (A) III, II, I, V, IV (B) III, V, II, I, IV (C) III, I, II, V, IV (D) III, II, V, I, IV After observing various slides showing different stages of binary fission in Amoeba, a student draws the following diagrams. However, these diagrams may not be in proper sequence. Identify the correct sequence of the above stages. (A) (B) III, V, II, I, IV (C) III, I, II, V, IV (D) 31/2/1 III, II, I, V, IV III, II, V, I, IV 19 P.T.O. 39. `r Q> _| _wHw$bZ H$s {H $`m Ho$ ~mao _| {Z Z{b{IV H$WZm| H$m A ``Z H$s{OE : I. _wHw$b {nV H$m` Ho$ {H$gr {deof ^mJ go CJVm h & II. {nV H$mo{eH$m Xmo g V{V H$mo{eH$mAm| _| {d^m{OV hmoVr h , Bg_| n V H$ nhMmZ g_m hmo OmVr h & III. {nV H$m` go n WH $ hmoZo go nhbo _wHw$b EH$ A ` _wHw$b ~Zm gH$Vm h & IV. O~ H$moB _wHw$b {nV H$m` go n WH $ hmo OmVm h , Vmo dh Z`m `{ > ~Z OmVm h & ghr H$WZ Mw{ZE : (A) I, II Am a III (B) II, III (C) I, III (D) I, II 1 Am a IV Am a IV Am a IV Study the following statements about the process of budding in Yeast : I. A bud arises from a particular region of a parent body. II. The parent cell divides into two daughter cells, here the parental identity is lost. III. Before detaching from the parent body, a bud may form another bud. IV. A bud when detaches from the parent body, grows into a new individual. Select the correct statements : (A) (B) II, III and IV (C) I, III and IV (D) 31/2/1 I, II and III I, II and IV 20 40. {H$gr H$jm Ho$ N>m m| Zo nmXnm| Ed O VwAm| Ho$ Cnb Y/n[aa{jV Z_yZm| Ho$ AnZo ojUm| Ho$ AmYma na {Z Z{b{IV {Z H$f {ZH$mbo & BZ {Z H$fm] H$m A ``Z H$s{OE, Am a ghr {Z H$fm] H$m M`Z H$s{OE : I. {gQ >g Ho$ H $Q>H$ VWm A_a~ob (Hw$H$a{~Q>m) Ho$ VmZ nmXnm| _| g_ $n g aMZmE h & II. Amby VWm eH$aH $Xr nmXnm| _| g_ $n A J h & III. H$sQ>m| Ho$ n I Am a M_JmX S>m| Ho$ n I O VwAm| _| g_ $n A J h & IV. H$sQ>m| Ho$ n I Am a n{j`m| Ho$ n I O VwAm| _| g_OmV A J h & 1 ghr {Z H$f h (A) I Am a II (B) II Am a III (C) III Am a IV (D) II Am a IV Study the following conclusions which were drawn by the students of a class on the basis of their observations of available/preserved specimens of plants and animals, and select the correct conclusions : I. Thorns of citrus and tendrils of cucurbita are analogous structures in plants. II. Potato and sweet potato are analogous organs in plants. III. Wings of insects and wings of bats are analogous organs in animals. IV. Wings of insects and wings of birds are homologous organs in animals. The correct conclusions are (A) (B) II and III (C) III and IV (D) 31/2/1 I and II II and IV 21 P.T.O. 41. AmnH$m OyQ> H$m W bm {d{^ gp O`m| O go JmOa, AXaH$, Amby, eH$aH $Xr, _ybr, Q>_mQ>a, \y$bJmo^r, Am{X go ^am h & BZ_| go do Xmo gp O`m Mw{ZE Omo g_OmV g aMZmAm| H$mo ghr {Z ${nV H$aVr h & (A) JmOa Am a Amby (B) Amby Am a Q>_mQ>a (C) Amby Am a eH$aH $Xr (D) 1 _ybr Am a JmOa You have a jute bag full of vegetables such as carrot, ginger, potato, sweet potato, radish, tomato, cauliflower, etc. Identify two vegetables to represent the correct homologous structures. (A) (B) potato and tomato (C) potato and sweet potato (D) 42. carrot and potato radish and carrot {H$gr N>m Zo amO_m (a S> {H$S>Zr ~rZ) Ho$ ^ yU H$m ojU H$aZo Ho$ n MmV CgHo$ ZrMo {XE JE Mma ^mJm| H$mo nhMmZm : I. ~rOn II. m Hw$a III. _ybm Hw$a IV. A V H$dM 1 ghr nhMmZo JE ^mJ h (A) (B) II, III Am a IV (C) I, III Am a IV (D) 31/2/1 I, II Am a III I, II Am a IV 22 A student observed an embryo of a red kidney bean and identified four parts in it as I. Cotyledon II. Plumule III. Radicle IV. Tegmen The correctly identified parts are (A) (B) II, III and IV (C) I, III and IV (D) 31/2/1 I, II and III I, II and IV 23 P.T.O.

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