2014 10 Lyp Science Sa2 09 Outside Delhi

8/9/2019 2014 10 Lyp Science Sa2 09 Outside Delhi

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narjmWu H moS >H mo Cma-nwpVH m Ho _wI-n>na Ad` {bIo&Candidates must write the Code on the

title page of the answer-book.

Series HRS H moS> Z. 31/3Code No.

amob Z.Roll No.

gH {bV narjm II

SUMMATIVE ASSESSMENT II{dkmZ

SCIENCE

{ZYm[aV g_` : 3KQ>o A{YH V_ AH : 90

Time allowed : 3 hours Maximum Marks : 90

H n`m OmM H a b| {H Bg Z-n _o _w{V n> 24h & Z-n _| Xm{hZo hmW H s Amoa {XE JE H moS >Z~a H mo N>m Cma-nwpVH m Ho _wI-n> na

{bI|& H n`m OmM H a b| {H Bg Z-n _| >42Z h & Hn`m Z H m Cma {bIZm ew H aZo gonhbo, Z H m H _mH Ad` {bI| & Bg Z-n H mo nT>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 monT>|Jo Ama Bg Ad{Y Ho XmamZ do Cma-nwpVH m na H moB Cma Zht {bI|Jo &

Please check that this question paper contains 24printed 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 42questions.

Please write down the Serial Number of the question beforeattempting 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.


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gm_m` {ZX}e:

(i) Bg Z n H moXmo ^mJm|, ^mJ A Ama ^mJ ~, _| ~mQ>m J`m h& AmnH moXmoZm| ^mJm| HoZm| Ho Cma {bIZo h &

(ii) g^r Z A{Zdm` h &

(iii) AmnH mo ^mJ A Ama ^mJ ~ Ho g^r Zm| Ho Cma nWH -nWH ^mJ Ho AmYma na

{bIZoh &

(iv) ^mJ A Ho Z g`m 1go 3Ho Z EH -EH AH Ho h& BZHo Cma EH eX AWdmEH dm` _| X| &

(v) ^mJ A Ho Z g`m 4 go 7 Ho Z Xmo-Xmo AH m| Ho h & BZHo Cma bJ^J30eXm| _| XoZo h &

(vi) ^mJ A Ho Z g`m 8 go 19 Ho Z VrZ-VrZ AH m| Ho h & BZHo Cma bJ^J50eXm| _| XoZo h &

(vii) ^mJ A Ho Z g`m 20 go 24 Ho Z nmM-nmM AH m| Ho h & BZHo Cma bJ^J70eXm|_| XoZo h &

(viii) ^mJ ~ Ho Z g`m 25go 42Ho Z `moJm_H H meb na AmYm[aV ~h {dH nr Zh& `oH Z EH AH H m h & {XE JE Mma {dH nm| _| go AmnH mo Hodb EH g~goCn`w {dH n MwZZm h &

General Instructions :

(i) The question paper comprises of two Sections, A and B. You are toattempt both the sections.

(ii) Allquestions are compulsory.

(iii) All questions of Section A and all questions of Section B are to beattempted separately.

(iv) Question numbers 1to3in Section A are one-mark questions. These are tobe answered in one word or in one sentence.

(v) Question numbers4to 7in Section A are two-marks questions. These areto be answered in about 30 words each.

(vi) Question numbers 8 to 19in Section A are three-marks questions. Theseare to be answered in about 50 words each.

(vii) Question numbers 20 to 24 in Section A are five-marks questions. Theseare to be answered in about 70 words each.

(viii) Question numbers 25 to 42 in Section B are multiple choice questionsbased 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.


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^mJ ASECTION A

1. VrZ Vdm| A, B Ama C Ho na_mUw H _mH H _e: 12, 18 Ama 20 h & H maU XoVo hE{b{IE {H BZ_| go {H Z XmoVdmo Ho JwUY_ g_mZ hm|Jo & 1The atomic numbers of three elements A, B and C are 12, 18 and 20

respectively. State, giving reason, which two elements will show similar

properties.

2. {H gr g_{> _| H moB Xmo Ord {Zanoj n _|g_mZ Zht hmoVo & `m| ? 1No two individual are absolutely alike in a population. Why ?

3. Hw N> bmoJm| H s g_ OrdZ-ebr H m n`mdaU na nS>Zodmbm EH X^md {b{IE & 1

Write one negative effect of affluent lifestyle of few persons on theenvironment.

4. hmBS>m _| _wHw bZ H mo XemZo Ho {bE> Zm_m{H V AmaoI It{ME & 2Draw labelled diagrams to illustrate budding inHydra.

5. 15 cm \ moH g Xar H m H moB AdVb XnU AnZo gm_Zo aIo {~~ H m grYo Amd{YV HogmW-gmW CQ>m Amd{YV {V{~~ r ~Zm gH Vm h &Bg H WZ H s nwpQ> XmooZm| H aUm| _|

{V{~~ m H aZoHo {bE {~~ H s XnU Ho Ywd Ho g~Y _| pW{V H m CoI H aVohEH s{OE & 2

A concave mirror of focal length 15 cm can form a magnified erect as

well as inverted image of an object placed in front of it. Justify this

statement stating the position of the object with respect to the pole of the

mirror in both cases for obtaining the images.

6. ndr go AnKQ>H m| Ho {dbw hmoZo Ho {H ht Xmo g^d n[aUm_m| H m H maU g{hV CoIH s{OE & 2State with reason any two possible consequences of elimination of

decomposers from the Earth.

7. Ob gJhU `m h ?`h VH ZrH Ob gajU _| {H g H ma ghm`Vm H a gH Vr h ? 2What is water harvesting ? How can this technique help in the

conservation of water ?


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8. {ZZ{b{IV gmaUr H m A``Z H s{OE {Og_| N> : Vdm| A, B, C, D, E Ama F H spW{V`m CZH s AmYw{ZH AmdV gmaUr _| pW{V`m| Ho AZwgma XemB JB h : 3

g_yh

AmdV 1 2 3 12 13 14 15 16 17 18

2 A B C

3 D E F

Cn w gmaUr Ho AmYma na {ZZ{b{IV Zm| HoCma Xr{OE :(i) Cg Vd H m Zm_ {b{IE Omo Ho db ghg`moOr `m{JH ~ZmVm h &(ii) Cg Vd H m Zm_ {b{IE {OgH s g`moOH Vm VrZ h Ama dh YmVw h &(iii) Cg Vd H m Zm_ {b{IE {OgH s g`moOH Vm VrZ h Ama dh AYmVw h &

(iv) D Ama E_o go{H g Vd H m AmH ma ~S>m h Ama m| ?(v) Vd C Ama F{Og n[adma Ho gX` h CgH m gm_m` Zm_ `m h ?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

Period

1 2 3 12 13 14 15 16 17 18

2 A B C

3 D E F

On the basis of the above table, answer the following questions :

(i) Name the element which forms only covalent compounds.

(ii) Name the element which is a metal with valency three.

(iii) Name the element which is a non-metal with valency three.

(iv) Out of D and E, which is bigger in size and why ?

(v) Write the common name for the family to which the elements Cand F belong.

9. Be, Mg VWmCa Vdm|_| go ooH Vd Ho ~mV_ H moe _| Xmo BboQ>mZ hmoVo hAma oAmYw{ZH AmdVgmaUr _| H _e: 2, 3 Ama4 AmdVHo gX` h & oH H aU _| nwpQ>H aVo hE {ZZ{b{IV Zm| Ho Cma Xr{OE : 3(i) o Vd {H g g_yh Ho gX` h ?(ii) BZ_| g~go H _ A{^{H merb Vd H mZ-gm h ?(iii) BZ_| go {H g Vd H s na_mUw {`m A{YH V_ h ?


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The elements Be, Mg and Ca each having two electrons in their

outermost shells are in periods 2, 3, and 4 respectively of the modern

periodic table. Answer the following questions, giving justification in each

case :

(i) Write the group to which these elements belong.

(ii) Name the least reactive element.

(iii) Name the element having largest atomic radius.

10. H moB H m~m}pg{bH Ab (AmpdH -gy C2H4O2) CoaH Ho n _| {H gr Ab H sCnpW{V _| {H gr EoH mohmb go A{^{H m H aHo EH `m{JH X~ZmVm h & `h EoH mohmbjmar` KMnO4Ho gmW AmgrH aU Ho nMmV AbrH aU H aZo na dhr H m~mopg{bHAb C2H4O2~Zm XoVm h & (i) H m~m}pg{bH Ab, (ii) EoH mohmb VWm (iii) `m{JHXHo Zm_ Ama gaMZm {b{IE & 3A carboxylic acid (molecular formula C2H4O2) reacts with an alcohol in

the presence of an acid catalyst to form a compound X. The alcohol on

oxidation with alkaline KMnO4followed by acidification gives the same

carboxylic acid C2H4O2. Write the name and structure of (i) carboxylic

acid, (ii) alcohol and (iii) the compound X.

11. gaMZm_H g_md`dVmH s n[a^mfm {b{IE & `m`m H s{OE {H monoZ `h JwUY_ `m|Zht Xem gH Vm & yQ>oZ C4H10Ho g^m{dV g_md`dm| H s gaMZmAm|Ho AmaoI It{ME & 3Define the term structural isomerism. Explain why propane cannot

exhibit this property. Draw the structures of possible isomers of butane,C4H10.

12. H moB N>m {H gr XnU Ho Ywd go _mo_~mr H s dmbm H mo 15 cm Xar na aIH a CgH m{V{~~ XnU go 90 cmXa pWV nXo na m H aZm MmhVm h & 3

(a) gwPmBE {H Cg N>m H mo {H g H ma H m XnU Cn`moJ H aZm Mm{hE &(b) Bg H aU _| a{IH AmdYZ kmV H s{OE &(c) {~~ Ama CgHo {V{~~ Ho ~rM H s Xar kmV H s{OE &

(d) Bg H aU _| {V{~~ ~ZZm XemZo Ho {bE {H aU AmaoI It{ME &A student wants to project the image of a candle flame on a screen 90 cm

in front of a mirror by keeping the flame at a distance of 15 cm from its

pole.

(a) Suggest the type of mirror he should use.

(b) Determine the linear magnification in this case.

(c) Find the distance between the object and its image.

(d) Draw ray diagram to show the image formation in this case.


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13. {ZZ{b{IV oH H aU _| And{VV {H aU H m nW XemZo Ho {bE {H aU AmaoIIt{ME : 3H me H s H moB Amn{VV {H aU {H gr AdVb b|g Ho(i) H m{eH Ho go JwOaVr h &(ii) _w` Aj Ho g_mVa h &(iii) _w` \ moH g H s Amoa {ZXo{eV h &

Draw a ray diagram to show the path of the refracted ray in each of thefollowing cases :

A ray of light incident on a concave lens is

(i) passing through its optical centre.

(ii) parallel to its principal axis.

(iii) directed towards its principal focus.

14. doV H me H m EH nVbm {H aU-nwO PQ {M _| XemE AZwgma H mM Ho {H gr {_ABC_| go JwOaVm h &

Bg {M H moAnZr Cma nwpVH m na It{ME Ama nXo DE na {ZJV nwO Ogm {XImBXoJmCgH m nW ItMH a XemBE &(i) ojU H s OmZo dmbr n[aKQ>Zm H m Zm_ Ama CgH m H maU {b{IE &(ii) BgHo A{V[a H {V _| Bg n[aKQ>Zm H m Amn Ama H hm ojU H aVo h ?(iii) Bg ojU Ho AmYma na doV H me Ho Ad`dm| Ho ~mao _| Omo {ZH f {ZH mbm Om

gH Vm hCgH m CoI H s{OE & 3A narrow beam PQ of white light is passing through a glass prism ABCas shown in the diagram.


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Trace it on your answer sheet and show the path of the emergent beam

as observed on the screen DE.

(i) Write the name and cause of the phenomenon observed.

(ii) Where else in nature is this phenomenon observed ?

(iii) Based on this observation, state the conclusion which can be drawn

about the constituents of white light.

15. {H gr Amhma mIbm _| D Om-dmh EH {X{eH hmoVm h &Bg H WZ H s nw{> H s{OE &nrS>H Zmer {H gr Amhma mIbm _| doe H aHo ~mX _| h_mao eara _| H go nhM OmVoh,g_PmBE & 3Energy flow in a food chain is unidirectional. Justify this statement.

Explain how the pesticides enter a food chain and subsequently get into

our body.

16. Ab{JH OZZ Ama b{JH OZZ Ho ~rM EH AVa {b{IE & Ab{JH OZZ H aZo dmbrAma b{JH OZZ H aZodmbr _| go {H gHo mam O{ZV nrerO H s CmaOr{dVm Ho ~ohVag`moJ hmogH Vo h ? AnZo Cma H s nwpQ> H s{OE & 3Write one difference between asexual and sexual mode of reproduction.

Which species is likely to have better chances of survival the one

reproducing asexually or the one reproducing sexually ? Justify your

answer.

17. OZZ {H m na DNA {VH {V ~ZZo, `{n `h {H m nyU noU {ddgZr` Zht h , H m`m ^md h ? `{n oH Z`r gV{V Xmo `pQ>`m| H s DNA {VH {V`m| H m g`moOZhmoVr h, V~ r Cg_| DNAH s _mm {H g H ma {Z`V ~Zr ahVr h ? 3What is the effect of DNA copying, which is not perfectly accurate, on the

reproduction process ? How does the amount of DNA remain constant

though each new generation is a combination of DNA copies of two

individuals ?

18. Om{V CX^dZ Ho {bE CmaXm`r VrZ _wI H maH m| H s gyMr ~ZmBE Ama CZ_| go oH H mgjon _| dUZ H s{OE & 3List three main factors responsible for the speciation and briefly describe

each one of them.

19. Eogm hmogH Vm h {H H moB bjU demZwJV hmo OmE, naVw ` Zht hmo & EH Cn wCXmhaU H s ghm`Vm go Bg H WZ H s nwpQ> H s{OE & 3A trait may be inherited, but may not be expressed. Justify this

statement with the help of a suitable example.


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20. H m~Z Ho A`{YH g`m _| `m{JH ~ZZo Ho Xmo H maU {JZmBE & BgHo A{YH me `m{JH m|_| nmE OmZo dmboAm~YZ Ho H ma H m Zm_ {b{IE & H m~Z _w` n goBgr H ma HoAm~YZ mam `m{JH `m| ~ZmVm h ?

H maU Xr{OE {H 5

(i)

H m~Z `m{JH mo Ho JbZmH Ama dWZmH {ZZ `m| hmoVo h &(ii) H m~Z `m{JH J{bV AdWm _| {dwV H m MmbZ `m|Zht H aVo &

List two reasons for carbon forming a large number of compounds. Name

the type of bonding found in most of its compounds. Why does carbon

form compounds mainly by this kind of bonding ?

Give reason why the carbon compounds

(i) generally have low melting and boiling points.

(ii) do not conduct electricity in molten state.

21. (a) _mZd Zo Ho CZ ^mJm| H s gyMr ~ZmBE Omo Zo _| doe H aZo dmbo H me H s _mm

H mo {Z {V H aVoh & do Bg H m H mo {H g H ma H aVo h, g_PmBE & 12

1

(b) _mZd Zo _| ao{Q>Zm (pQ>nQ>b) H m H m {b{IE &2

1

(c) `m Amn OmZVo h {H H m{Z`m-AYVm H m CnMma ZoXmZ mam nm H m{Z`m Ho`mamonU mam {H m Om gH Vm h ?h_| `moAma {H g H ma g_mO Ho gX`m|

H mo _ w Ho nMmV ZoXmZ Ho {bE mogm{hV H aZo Ho {bE g_yhm| H mo gJ{R>VH aZm Mm{hE? 3(a) List the parts of the human eye that control the amount of light

entering into it. Explain how they perform this function.

(b) Write the function of retina in human eye.

(c) Do you know that the corneal-impairment can be cured by

replacing the defective cornea with the cornea of the donated eye ?

How and why should we organise groups to motivate the

community members to donate their eyes after death ?22. (a) Jmobr` b|gm| go g~{YV {ZZ{b{IV nXm|H s `m`m H s{OE :

(i) H m{eH Ho (ii) dH Vm-Ho(iii) _w` Aj(iv) maH(v) _w` \ moH g(vi)

\ moH g Xar


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(b) {H gr A{^gmar b|g H s \ moH g Xar 12 cm h & dh {~~ Xar n[aH {bV H s{OE{Og na {H gr {~~ H mo aIZo na CgH m n{V{~~ b|g Ho Xgar Amoa bog go48 cmXa ~ZVm h & 5

(a) Explain the following terms related to spherical lenses :

(i) optical centre(ii) centres of curvature

(iii) principal axis

(iv) aperture

(v) principal focus

(vi) focal length

(b) A converging lens has focal length of 12 cm. Calculate at what

distance should the object be placed from the lens so that it formsan image at 48 cm on the other side of the lens.

23. (a) _mZd _mXm OZZ-V Ho H mQ> ` H m AmaoI It{ME & Cg ^mJ H m Zm_mH ZH s{OE Ohm(i) AS> {dH {gV hmoVo h &(ii) {ZfoMZ hmoVm h&

(iii) {Zfo{MV AS> Amamo{nV hmoVm h &

(b) gjon _| CZ n[adVZm| H m dUZ H s{OE Omo J^me` _| Cg pW{V _o hmoVo h(i) O~ dh w_ZO JhU H aVm h &(ii) O~ w_ZO Zht ~ZVm & 5

(a) Draw a sectional view of human female reproductive system and

label the part where(i) eggs develop.

(ii) fertilisation take place.

(iii) fertilised egg gets implanted.

(b) Describe, in brief, the changes the uterus undergoes

(i) to receive the zygote.

(ii) if zygote is not formed.


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24. (a) ZrMo {XE JE {M _| Zm_m{H V ^mJm| A, B, C Ama DHo Zm_ {b{IE :

(b) namJU `m h ?BgHo _hd H m CoI H s{OE &

(c) nwnm| _| {ZfoMZ {H g H ma hmoVm h ?nwn Ho Cg ^mJ H m Zm_ {b{IE Omo (i)~rO_o| {dH {gV hmoVm h, VWm (ii){ZfoMZ Ho nMmV \ b _| {dH {gV hmoVm h& 5

(a) Name the parts labelled as A, B, C and D in the diagram given below :

(b) What is pollination ? State its significance.

(c) How does fertilisation occur in flowers ? Name the parts of the

flower that develop into (i) seed, and (ii) fruit after fertilisation.


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^mJ ~SECTION B

25. {ZZ{b{IV {H gr [~rOnr ~rO Ho yU H s gaMZm HoAmaoI _| BgHo A{H V ^mJ I, IIAma III H_dma `m h ? 1

(A) mHwa, ~rOn, _ybmHw a(B) mHwa, _ybmHw a, ~rOn(C) ~rOn, mHw a, _ybmHwa(D) _ybmHw a, mHw a, ~rOn

In the following diagram showing the structure of embryo of a dicot seed,

what are the parts marked I, II and III sequentially ?

(A) Plumule, Cotyledon, Radicle(B) Plumule, Radicle, Cotyledon

(C) Cotyledon, Plumule, Radicle

(D) Radicle, Plumule, Cotyledon

26. {ZZ{b{IV H WZm| H m A``Z H s{OE :I. njr Ho nI Ama M_JmXS> Ho nI g_OmV AJ h &II. njr Ho nI Ama H sQ>m| Ho nI nmV[aV AJnmX h &III.

njr Ho nI Ama H sQ>m| Ho nI g_d{m AJ h &IV. njr Ho nI Ama KmoS>o Ho AJnmX g_OmV AJ h &

BZ_| ghr H WZ h 1(A) I AmaII(B) II AmaIII(C) III AmaIV(D) I AmaIV


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Study the following statements :

I. Wings of birds and wings of bats are homologous organs.

II. Wings of birds and wings of insects are modified forelimbs.

III. Wings of birds and wings of insects are analogous organs.

IV. Wings of birds and forelimbs of horse are homologous organs.

The correct statements are

(A) I and II

(B) II and III

(C) III and IV

(D) I and IV

27. {ZZ{b{IV Xmo gpO`m| H m H mZ-gm OmoS>m g_OmV gaMZmAm|H m ghr {Z nU H aVm h ? 1(A) eH aH Xr Ama Amby(B) eH aH Xr Ama Q>_mQ>a(C) JmOa Ama Amby(D) _ybr Ama JmOaWhich of the following pairs of two vegetables represents the correct

homologous structures ?

(A) Sweet potato and potato

(B) Sweet potato and tomato(C) Carrot and potato

(D) Radish and carrot

28. O~ Amn `rQ> _| _wHw bZ Ho {d{^ MaUm| H mo XemVr hB bmBS> H m A``Z H aVo h, VmoCg g_` Amn {ZZ{b{IV MaUm| H m ojU H aVoh :I. _wHwb OZH H m` go nWH hmo ahm h Ama Z`r `pQ> _| {dH {gV hmo ahm h&II. _wHwb H m` {dH {gV hmoVr h Ama Cggo A` {eew _wHw b H m CXJ_ hmoVm h &III. OZH H mo{eH m H s H m` go{H gr ^r {Xem _| _wHw b ~mha AmVm h &IV. Bg H ma o EH H mbmoZr (_S>b) ~Zm boVoh &Cn w MaUm| H m ghr H_ h 1(A) II, I, III, IV

(B) II, III, I, IV

(C) III, II, I, IV

(D) III, I, II, IV


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When you study a slide showing different stages of budding in yeast, you

observe the following stages :

I. The bud may get separated from the parent body and develop into

a new individual.

II. The body of the bud develops and gives rise to another baby bud.

III. A bud comes out in any direction from the body of the parent cell.

IV. Thus they may form a colony.

The proper sequence of the above stages is

(A) II, I, III, IV

(B) II, III, I, IV

(C) III, II, I, IV

(D) III, I, II, IV

29. {H gr N>m H mo A_r~m _| [IS>Z Ho {d{^ MaUm| H mo XemZo dmbr V`ma bmBS> H moAnZo g w gy_Xeu _| \ moH {gV H aZm h& BgHo {bE Cgo {OZ g^d MaUmo H m nmbZ

H aZm h do A`dpWV H_ _| ZrMo {XE JE h :I. gy_Xeu Ho S>m`m\ m_ Ama XnU H mo Bg H ma g_m`mo{OV H s{OE {H bmBS> H mo

Xr H aZo Ho {bE n`m H me doe H a gHo &

II. _M (Q>oO) na bmBS> H mogmdYmZrnydH bJmBE &

III. gy_Xeu H mo Ce{ na g_m`mo{OV H aHo \ moH {gV H s{OE &

IV. gy_Xeu H mo {ZZ e{ na g_m`mo{OV H aHo \ moH {gV H s{OE &

gy_Xer_| bmBS> Ho ojU Ho {bE Cn w MaUm| H m ghr H _ h 1

(A) I, II, IV, III

(B) II, I, IV, III

(C) II, IV, I, III

(D) I, IV, II, III


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A student has to focus his compound microscope to observe a prepared

slide showing different stages of binary fission inAmoeba. The steps he is

likely to follow are listed below in a haphazard manner :

I. Adjust the diaphragm and the mirror of the microscope so that

sufficient light may enter to illuminate the slide.

II. Fix the slide on the stage carefully.

III. Adjust the microscope to high power and focus.

IV. Adjust the microscope to low power and focus.

The correct sequence of the above steps to observe the slide under the

microscope is

(A) I, II, IV, III

(B) II, I, IV, III

(C) II, IV, I, III

(D) I, IV, II, III

30. H moB N>m EH ewH naIZbr _| bJ^J 2 mL EWoZmBH Ab boH a Cg_| EH MwQ>H sgmo{S>`_ hmBS>moOZ H m~moZoQ> {_bmVm h & BgHo nMmV dh {ZZ{b{IV ojU ZmoQ> H aVmh :I. VwaV hr ~wX~wXmhQ> Ho gmW H moB aJhrZ Ama JYhrZ Jg {ZH bVr h &

II. `h Jg MyZoHo nmZr _| JwOmao OmZo na Cgo X{Y`m H a XoVr h &

III. ObVr {N>nQ>r H moBg Jg Ho {ZH Q> bmZo na `h Jg {d\ moQ> HogmW ObVr h &

IV. O~ ObVr {N>nQ>r H moBg Jg Ho {ZH Q> bmVo h Vmo dh {N>nQ>r ~wP OmVr h &BZ_| ghr ojU h 1(A) I, II AmaIII(B) II, III AmaIV(C) III, IV AmaI(D) I, II AmaIV


15/24

31/3 15 P.T.O.

A student takes about 2 mL ethanoic acid in a dry test tube and adds a

pinch of sodium hydrogen carbonate to it. He reports the following

observations :

I. Immediately a colourless and odourless gas evolves with a brisk

effervescence.

II. The gas turns lime water milky when passed through it.

III. The gas burns with an explosion when a burning splinter is

brought near it.

IV. The gas extinguishes the burning splinter that is brought near it.

The correct observations are

(A) I, II and III

(B) II, III and IV

(C) III, IV and I

(D) I, II and IV31. EWoZmBH Ab Ho JwUY_mo H m A``Z H aZoHo {bE EH `moJ _| H moB N>m EH ewH

naIZbr _| bJ^J 3 mLEWoZmBH Ab boVm h & dh Bg naIZbr _| BVZr hr _mm _| AmgwV Ob {_bmH a, naIZbr H mo^br-^m{V {hbmVm h & Hw N> g_` nMmV ojU H aZona dh N>m nmEJm {H 1(A) naIZbr _| EH H mobmBS> ~Z J`m h &(B) EWoZmBH Ab Ob _| AmgmZr go Kwb J`m h &(C) {db`Z hH m ZmaJr hmo J`m h &(D) EWoZmBH Ab H s gVh Ho D na Ob Va ahm h &In an experiment to study the properties of ethanoic acid, a student takes

about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount

of distilled water to it and shakes the test tube well. After some time he

is likely to observe that

(A) a colloid is formed in the test tube.

(B) the ethanoic acid dissolves readily in water.

(C) the solution becomes light orange.

(D) water floats over the surface of ethanoic acid.32. h_o gm~wZrH aU A{^{H m H m A``Z H aZo Ho {bE 20% Obr` gmo{S>`_ hmBS>mgmBS>

{db`Z Mm{hE & O~ h_ R>mog gmo{S>`_ hmBS>mgmBS> H s ~moVb H m T> Z ImobVo h, Vmoh_ Bgo {H g d n _| nmVoh ? 1(A) aJhrZ nmaXeu _{UH m (~rS>)(B) N>moQ>r doV _{UH m (~rS>)(C) doV Jw{Q>H mE/nn{S>`m(D) doV _hrZ MyU


16/24

31/3 16

We need 20% aqueous solution of sodium hydroxide for the study of

saponification reaction. When we open the lid of the bottle containing

solid sodium hydroxide we observe it in which form ?

(A) Colourless transparent beads

(B) Small white beads

(C) White pellets/flakes

(D) Fine white powder

33. gm~wZrH aU A{^{H m H m A``Z H aVo g_` H moB N>m A{^{H m {_lU H m Vmn _mnVmh Ama gmW hr dh Zrbo/bmb {bQ>_g n mam Cg {_lU H s H {V ^r kmV H aVm h&CgHo ojUm| Ho AmYma na ghr {ZH f `m hmoJm ? 1(A) A{^{H m D _mjonr hAma A{^{H m {_lU Abr` h &(B) A{^{H m D _memofr hAma A{^{H m {_lU Abr` h &(C) A{^{H m D _memofr h Ama A{^{H m {_lU jmar` h &

(D) A{^{H m D _mjonr hAma A{^{H m {_lU jmar` h &While studying saponification reaction, a student measures the

temperature of the reaction mixture and also finds its nature using

blue/red litmus paper. On the basis of his observations the correct

conclusion would be

(A) the reaction is exothermic and the reaction mixture is acidic.

(B) the reaction is endothermic and the reaction mixture is acidic.

(C) the reaction is endothermic and the reaction mixture is basic.

(D) the reaction is exothermic and the reaction mixture is basic.34. {H gr ~Vr _| `moJ H aZo Ho {bE Amd`H H R>moa Ob CnbY Zht h & naVw Hy b H s

`moJembm _| {ZZ{b{IV bdU CnbY h :1. gmo{S>`_ g\o Q>2. H pg`_ g\o Q3. _Zr{e`_ bmoamBS>4. gmo{S>`_ bmoamBS>5.

Hpg`_ bmoamBS> 6. nmoQ>{e`_ g\oQ>`moJ Ho {bE H R>moa Ob m H aZo Ho {bE Ob _| Cn w bdUm| _| go {H ho Kmobm OmgH Vm h ? 1(A) 2, 3 Ama 5(B) 1, 2 Ama 5(C) 1, 2, 4 Ama 6(D) Hodb 3 Ama 5


17/24

31/3 17 P.T.O.

In a locality, hard water, required for an experiment, is not available.

However, the following salts are available in the school laboratory :

1. Sodium sulphate

2. Calcium sulphate

3. Magnesium chloride

4. Sodium chloride

5. Calcium chloride

6. Potassium sulphate

Which of the above salts may be dissolved in water to obtain hard water

for the experiment ?

(A) 2, 3 and 5

(B) 1, 2 and 5

(C) 1, 2, 4 and 6

(D) 3 and 5 only

35. {H gr N>m Zo ZrMo {M _| XemE AZwgma H m{eH w{ X H m Cn`moJ H aHo gy H s[H aUm|H mo nXo Sna \ moH {gV {H m &

Bggo `h {ZH f{ZH mbm Om gH Vm h {H w{ X(ghr {dH n Mw{ZE) 1(A) 10 cm \ moH g Xar H m Cmb b|g h &

(B) 20 cmdH Vm {`m H m Cmb b|g h &

(C) 20 cm \ moH g Xar H m Cmb b|g h &

(D) 20 cm \ moH g Xar H m AdVb XnU h &


18/24

31/3 18

A student focussed the Sun rays using an optical device X on a screen Sas shown.

From this it may be concluded that the device Xis a (select the correctoption)(A) Convex lens of focal length 10 cm.

(B) Convex lens of radius of curvature 20 cm.

(C) Convex lens of focal length 20 cm.(D) Concave mirror of focal length 20 cm.

36. {H gr N>m Zo {XE JEF1 \ moH g Xar Ho Jmobr` Xnm Ho Cn`moJ mam {H gr ^br-^m{VXr XaW {~~ H m {V{~~ nXo na \ moH {gV {H m & BgHo nMmV {ejH Zo Cgo F2\ moH g Xar H m H moBA` XnU XoH a Cgr {~~ H mo Cgr nX} na \ moH {gV H aZo Ho {bEH hm & Cg N>m Zo `h nm`m {H Cgr {~~ H mo XgaoXnU go \ moH {gV H aZo Ho {bE CgoXnU H mo nX} go Xa hQ>mZm nS>m & CgHo Bg ojU go `h {ZH f {ZH mbm Om gH Vm h {H

Cgo {XE JE XmoZm| Jmobr` XnU (ghr {dH n Mw{ZE)1

(A) AdVb WoVWm F1< F2(B) AdVb WoVWm F1> F2(C) Cmb Wo VWm F1< F2(D) Cmb Wo VWm F1> F2A student has obtained an image of a well-illuminated distant object on ascreen to determine the focal length, F1of the given spherical mirror. Theteacher then gave him another mirror of focal length, F2and asked him

to obtain a focussed image of the same object on the same screen. Thestudent found that in order to focus the same object using the secondmirror, he has to move the mirror away from the screen. From thisobservation it may be concluded that both the spherical mirrors given tothe student were (select the correct option)(A) Concave and F1< F2

(B) Concave and F1> F2

(C) Convex and F1< F2

(D) Convex and F1> F2


19/24

31/3 19 P.T.O.

37. {ZZ{b{IV AmaoI _| H mM Ho {_ go hmoH a JwOaZo dmbr {H gr H me {H aU H m nWXem`m J`m h :

Bg AmaoI _| AmnVZ H moU, {ZJV H moU VWm {dMbZ H moU H_e: {H Z Ajam| mam{Z {nV {H E JE h ?(ghr {dH n Mw{ZE) 1

(A) X, R AmaT(B) Y, Q AmaT

(C) X, Q AmaP

(D) Y, Q AmaP

In the following diagram, the path of a ray of light passing through a

glass prism is shown :

In this diagram the angle of incidence, the angle of emergence and the

angle of deviation respectively are (select the correct option) :

(A) X, R and T

(B) Y, Q and T

(C) X, Q and P

(D) Y, Q and P


20/24

31/3 20

38. {ZZ{b{IV {Mmo H mo A``Z H s{OE {OZ_| Mma N>mm| P, Q, RAma S mam {H gr H mMHo {_ go hmoH a Jw OaZo dmbr H me {H aU Ho Ambo{IV nW XemE JE h :

ghr nW Ambo{IV H aZo dmbm N>m h 1

(A) P

(B) Q

(C) R

(D) S

Study the following diagrams in which the path of a ray of light passing

through a glass prism as traced by four students P, Q, R and S is shown :

The student who has traced the path correctly is

(A) P

(B) Q

(C) R

(D) S


21/24

31/3 21 P.T.O.

39. H moB N>m 18 cm \ moH g Xar Ho Cmb bog H m Cn`moJ, b|g go {~~ H s {d{^ X[a`m| Ho{V{~~ ~ZZo H m A``Z H a ahm h & dh ojU H aVm h {H O~ dh {~~ H mo b|g go27 cm Xar na aIVm h, Vmo {V{~~ bog Ho Xgar Amoa 54 cm Xar na ~ZVm h &{ZZ{b{IV AmaoI _| go CZ VrZ {H aUmo H mo Mw{ZE OmoH me Ho AndVZ Ho {Z`_m| H mnmbZ H aVr h Ama {OZH m Cn`moJ gJV {H aU AmaoI ItMZo Ho {bE [H m Om gH Vm

h&1

(A) 1, 2 Ama 4(B) 1, 3 Ama 5(C) 2, 4 Ama 5(D) 2, 3 Ama 4

A student is using a convex lens of focal length 18 cm to study the image

formation by it for the various positions of the object. He observes that

when he places the object at 27 cm, the location of the image is at 54 cm

on the other side of the lens. Identify from the following diagram the

three rays that are obeying the laws of refraction and may be used to

draw the corresponding ray diagram.

(A) 1, 2 and 4

(B) 1, 3 and 5

(C) 2, 4 and 5

(D) 2, 3 and 4


22/24

31/3 22

40. H moB N>m 10 cm \ moH g Xar Ho Cmb b|g H m Cn`moJ H aHo {~~ H s {d{^ X[a`m|Ho

{bE Cmb b|g mam ~ZZo dmbo {V{~~m| H m A``Z H a ahm h& {H gr EH ojU _| dh

`h nm gH Vm h {H O~ {~~ b|g go 20 cm Xar na aIm h, Vmo CgH m {V{~~ ~ZVm h

(ghr {dH n Mw{ZE) 1

(A) b|g Ho Xgar Amoa 20 cmXar na Ama `h g_mZ AmH ma H m, dmV{dH Ama grYmh &

(B) b|g Ho Xgar Amoa 40 cmXar na Ama `h Amd{YV, dmV{dH Ama CQ>m h &

(C) b|g HoXgar Amoa 20 cmXar na Ama `h g_mZ AmH ma H m, dmV{dH Ama CQ>mh &

(D) b|g Ho Xgar Amoa 20 cm Xar na Ama `h g_mZ AmH ma H m, Am^mgr Ama grYmh &

A student is using a convex lens of focal length 10 cm to study the image

formation by a convex lens for the various positions of the object. In one

of his observations, he may observe that when the object is placed at adistance of 20 cm from the lens, its image is formed at (select the correct

option)

(A) 20 cm on the other side of the lens and is of the same size, real and

erect.

(B) 40 cm on the other side of the lens and is magnified, real and

inverted.

(C) 20 cm on the other side of the lens and is of the same size, real and

inverted.

(D) 20 cm on the other side of the lens and is of the same size, virtual

and erect.


23/24

31/3 23 P.T.O.

41. H moB N>m H mM H s Am`VmH ma {gr gohmoH a Jw OaZodmbr H me {H aU H m nW Ambo{IVH a Cg na ZrMo {XE AZwgma AmnVZ H moU i, AndVZ H moU r VWm {ZJV H moU e A{H VH aVm h &

BZ_| go ghr A{H V H moU h/h 1(A) Hodb i(B) Hodb e(C) Hodb r(D) i Ama e

A student traces the path of a ray of light passing through a rectangular

glass slab and marks the angle of incidence i, angle of refraction r and

angle of emergence e, as shown.

The correctly marked angle(s) is/are

(A) i only

(B) e only

(C) r only

(D) i and e


24/24

42. Mma {^ _mZ dmbo AmnVZ H moU H s H me {H aUm| H m, H mM H s Am`VmH ma {gr gohmoH a JwOaZona, nW H m AmboIZ H aZo Ho nMmV, {H gr N>m Zo AnZo ojUm| H mo gmaUrHo n _| {ZZ H ma Xem`m :

H _ g`m i r e

I 30 19 29

II 40 28 40

III 50 36 50

IV 60 40 59

BZ_| gdmom_ ojU h 1

(A) I

(B) II

(C) III

(D) IV

After tracing the path of a ray of light passing through a rectangular

glass slab for four different values of the angle of incidence, a student

reported his observations in tabular form as given below :

S. No. i r e

I 30 19 29

II 40 28 40

III 50 36 50

IV 60 40 59

The best observation is

(A) I

(B) II

(C) III

(D) IV

2014 10 Lyp Science Sa2 09 Outside Delhi

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