CBSE QUESTION PAPER CLASS-X

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����,,General Instructions :

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

(ii) All questions are compulsory.(iii) There is no overall choice. However, internal choice has been

provided in all the three questions of five marks category. Only oneoption in such questions is to be attempted.

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

(v) Questions number 1 to 4 in Section A are one-mark questions.These are to be answered in one word or one sentence.

(vi) Questions number 5 to 13 in Section A are two-mark questions.These are to be answered in about 30 words each.

(vii) Questions number 14 to 22 in Section A are three-mark questions.These are to be answered in about 50 words each.

(viii) Questions number 23 to 25 in Section A are five-mark questions.These are to be answered in about 70 words each.

(ix) Questions number 26 to 41 in Section B are multiple choicequestions based on practical skills. Each question is a one-markquestion. You are to select one most appropriate response out of thefour provided to you.

�3l SECTION A

1. 3"";r cfil4f.lcfi � � � � cfiT ;,ri:r � � fufurQ:, � Slcfil4f,l-fcfi � - OHt I 1 Write the name and formula of the second member of the carbon compounds having functional group - OH.

2. llRcf � # qRa1Rcfi1 � � cfirf cfiT � � 1State one function of iris in human eye.

3. cf<lT m-ar � � c!ISJ.i0-5(1 � � � "91: � � q@ q{1�·J14l ftjfcn{OI dllcHil;jH "91:

1

���? 1 What happens when higher energy ultraviolet radiations act on theoxygen at the higher level of the atmosphere ?

4. M � � # '4f<:: 3c<il;cfi � "91: 10,000 � � � t m r�rnl4cfi� � -qm � � it �Hl'*1Ra cfiB � � fcfla';ft � � M ? 1

In a food chain, if 10,000 joules of energy is available to the producer, howmuch energy will be available to the secondary consumer to transfer it to the tertiary consumer ?

5. � ¥9 (TT9 � � � :

6C, 80, 10Ne, 11Na, 14Si

(i) � 'B -a; (TT9 � � � 3Tic@ l) ITT � I

(ii) � 'B -a; <TTcf � � � � # m;,r � I� � l) � � � � cfiT<UT fufurQ:

Choose from the following

6C, 80, 10Ne, 11Na, 14Si (i) Elements that should be in the same period.(ii) Elements that should be in the same group.State reason for your selection in each case.

6. � <TTcf 'X' 3WIB � � WW 3Tic@ � � � cfiT t I � <TTcf (i) cfiT

2

�i.-lcf?Tf.lcfi �, (ii) cfil fi4);jjcfidl fufurQ: I � 3m: cfil cfi"RUT $ � � ·1 2

An element 'X' beiongs to 3rd period and group 17 of the periodictable. State its (i) electronic configuration, (ii) valency. Justify youranswer with reasoning.

7. � � cfiT ;yp:r �, � � � ID"U � � � cfi"{ffi % I �.., � 3-�� 9'l � � � �3TI if; 3lR (�) cf � qiB -q � i I 2

Name an organism which reproduces by spore formation. List threeconditions favourable for spore� to germinate and grow.. .

8. � if; fcrcm:r -q ���I 9'l � cfiT � � I

State the role of placenta in the development of embryo.

9. � � 311W � � � � � fcRuTT cfiT � � � 1 B fcRuTT cfiT� � m fcn<:Tr � � � c:fuT � 4<1clJ.:i it; � � � Wo � m"ITT I B � fcRuTT 9'l � � (fm 4<1cld.-! it; � � � cfiT � � IB fcRuTT it; � ID"U ofcTT@ c:fuT it; � � � � it; � � � it;

2

J.l@f¾kl 9'l WITT'f � � I 2

To construct ray diagram we use two light rays which are so chosenthat it is easy to know their directions after reflection from. themirror. List these two rays and state the path of these rays afterreflection. Use these rays to locate the image of an object placedbetween centre of curvature and focus of a concave mirror.

10. fcfim � it; � � ffif � it; � fcn<ur-� it; � -R � � qi) �it; � <iltiifcha � 311W � I 2

Draw a labelled ray diagram to illustrate the dispersion of a narrow beamof white light when it passes through a glass prism.

11. 3Wflm -q � (fRf � cll«'!Mch w.:rfu � ¥9 � (� <R) ffi � � I .:uiiifcha3:rmsf 9'l flt;lllol � � cxlT&IT � I 2 A star appears slightly higher (above) than its actual position in the sky.Illustrate it with the help of a labelled diagram.

12. � Gltm it; RGfUT � � fil.-f �3TT cfil � � I B �3TT � � ��I 2

List three problems which arise due to construction of big dams.Suggest a solution for these problems.

13. '3Jlcll��l ��if;���� 9'l � � I � -<-·==-�I "CR <F1T � Qffit ? 2

List the products of combustion of fossil foc-13. -.-,nat are their adYerseeffects on the environment ?

14. chl4Rch � cf>1 �G-J11(1ll! � B � � � ? M flG-J!lffill � � � � �<m1l!Rch � � 3:fr< � 'lWT 'i:hT � � � � � � Ci) 'lTI@cfi �,(ii) <lflll!Rc:fi �' q;) Rmftf cf){ffi � I 3 What is meant by homologous series of organic compounds ? Writethe chemical formulae of two members of a homologous series andstate which part determines the (i) physical properties, (ii) chemicalproperties, of these compounds.

15. Na, Mg� Al� � � � Bcfl\ilcfic11 �<-lcf?T..?i cf>1 � � �' � � �� I ¢ (i) � � � :m'� t (ii) c1it.l � � 3ffeii1hlll�Tici � ?>R% � � qiRlTf � 3m � cf>1 � � I 3 Na, Mg and Al are the elements having one, two and three valenceelectrons respectively. Which of these elements (i) has the largestatomic radius, (ii) is least reactive ? Justify your answer statingreason for each.

16. TN-f.ro� cf>1 � � cf>1 � � 3ID: >R% q;t � # � � I

List and explain in brief three methods of contraception.

17. * � � � � � � (�) � � lJT'cTT 'chT � � � � (�)� � lJT'cTT B mur � m � F

1 � � � � � � � 1 � * �

F1

� � � � 'C!Tm 'chT "f9-� �' m � F2

� � � � � mi:a

mrt

(a) F 1 � � 'CIT� � � � ?(b) F2 � # � 'C!Tm �� � 'C!Tm 'chT � � � ?(c) � WfiR � 'C!Tm 'chT � � � F1 � # � � � � � F2

3

� # �fa1ihl< "ITT � I >R% � � qiRlTf � I 3 If we cross pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F

1 generation. If we

now self-cross the pea plant of F 1

generation, then we obtain pea plants of F 2

generation.

(a) What do the plants of F 1 generation look like ?

(b) State the ratio of tall plants to dwarf plants in F2 generation.

(c) State the type of plants not found in F 1 generation but appearedin F 2 generation, mentioning the reason for the same.

18. 3q1�a BaJUTf 3fu: dilj�f�1cti BaJUTf ii � cfiB cTTffi � Fcd11:1a1-m cfil � �<flmT ii � I � cfiT �-� 3c!JQ{OI 'm � I 3

List in tabular form two distinguishing features between acquired traitsand inherited traits, with one example of each.

19. sffiql�14 � m � � ? sffiq1�qi cfil 3TT"g f.J� cJiB cti1 � fcff� cfiT � iicf1JR � I 3

How are fossils formed ? Describe, in brief, two methods of determiningthe age of fossils.

20. cfiT{ � 4lc.H11$fch"'11 t (i) 3Tffl 3W (ii)���' ii��� qffi�twmrcfil��, >R%>!cfi{Uliiam�cti1�t�cnRUT�I 3

· State the types of mirrors used for (i) headlights and (ii) rear view mirrors,in cars and motorcycles. Give reason to justify your answer in each case.

21. 4 cm � � � 24 cm � � t � ml t � � t ('l�qq_ w.rn- � I

� cfil ml � � 16 cm � I ml � qif � � <if.R cfIB Sl@�� ch1 �,���ffl� I 3

A 4 cm tall object is placed perpendicular to the principal axis of a convexlens of focal length 24 cm. The distance of the object from the lens is16 cm. Find the position, size and nature of the image formed, using thelens formula.

22. � � 3TT"g qif � � � 1 m � qilf � 1R w.rn- �an cfiT � � � <TTmt I � � � � � � t ? � �� � m M � "W@" � ? �(i) � zy:f 3W � (ii) �� if; � 'm � a:rrt@ � I 3

An old man cannot see objects closer than 1 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected ? Draw ray diagram for the (i) defect of vision and also (ii) for its correction.

23. t?l��lctil4.:i cf<:lT � ? (i) � Ql��lcfilaf•i'i, (ii) � Q1$�1cfilii{.fl qif � (fey mi=rR� � o2lr >R% m t � �1��1cfi1csf.:i cfil � cfiT � 1 !cnfll �Ql��1cti14.:i cfiT � m � � � "W@" � ? 5

3l?;Jcff

F', -::,m-.:+ � � Tl'TT"d-�f::r,,,- ,,., ' ' ' • (RiJllMcfi �It: ti 3i4J.ll cfi cf<:lT Q ? 't1'1ll� Cfl l\"I� di4J.lj;jjcf,J ql 31l"llTTr Q-, cJ' � � � � cfi1 � � I &l � 1R 'm, � � if &ilctilll4 o2U 4,.S �1414 � � �' � if; � 3i441�chl if; � � cfiT cnRUT l<:'1,...©Q, I

What are hydrocarbons ? Write the name and general formula of (i) saturated hydrocarbons, (ii) unsaturated hydrocarbons, and drawthe structure of one hydrocarbon of each type. How can anunsaturated hydrocarbon be made saturated ?

OR

What -are detergents chemically ? List two merits and two demerits of using detergents for cleansing. State the reason for the suitability of detergents for washing, even in the case of water having calcium and magnesium ions.

24. � cfiT � '1c;IQ.f.UI W Q,ct,f�pft � � � � � � � I �

3ffi"& �·Yilcti< c1facti1Q "Cf{ q{1i1q;oi'f cfiT � � o� frr8 m7Tf cfiT ·ill-lifcha

(i) � �-chln? lcfil (�)

(ii) � �-chln?lcfil (�)

(iii) �O:Sl�ll!31�

1:fm � lTIGT � � cfiT 3ffi"& &f'i:lcti< f.-!1-.-1f�fula m7Tf cfiT 114ifctia �

(i) � � � � � cR'i:iT t I

(ii) � � � � � � cfjf fi@;r mar t

(iii) � � � f.-l�f¾a � (�:�/41\lJ) � � t

�1:fm3lUscfil��mcTTt Mcf<lfmctTt?

Distinguish between unisexual and bisexual flowers givmg one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts

(i) Female germ cell

(ii) Male germ cell

(iii) OvaryOR

5

Draw a diagram of human female reproductive system and label the part

(i) that produces eggs.

(ii) where fusion of egg and sperm takes place.

(iii) where zygote is implanted.

What happens to human egg when it is not fertilised ?

25. � � "[TU � � q{lqcf-1 � � -;,°{ � � qf<q12.l cfil � � I �

5

� @"(-qq,{ � � qf<q12.l cflT 3ij5l�lll fcfim � � � q;r � <iU � �

cra- � cfi8 if � � � � mlH 18 cm� 1R ft.2Rr 1%m � cfiT 1/3 :flT

� � 3lNTm 5lfa�k! � � I

3l?.lcff

Wnm fcfl{ur 3lmsr q;t B�w-1a1 � Wnm ?ti � � � cfiT � � 1 Wnm

?ti � ?ti � m � � cfiT � � � � i1fomllf � if o1:ffii � � I

cfifq � � � cfiT 6JqqJ-1icb 2/3 o2IT � � � � cflT dlqqJ;:ijq, 4/3 � I 'lJfc:; cfifq if � cfil � 2 X 108 rn/s t, fil (a) � if, (b) � if, � cfil ���I

List the new Cartesian sign convention for reflection of light by spherical mirrors. Draw a diagram and apply these conventions for calculating the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.

OR

With the help of a ray diagram, state what is meant by refraction of light. State Snell's law for refraction of light and also express it mathematically.

The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3. If the speed of light in glass is 2 x 108 mis, find the speed of light in (a) air, (b) water.

'qllTif

SECTION B

26. w�o�m���fclwRsPrn:��t

(A) � 3W �

(B) � 3W �

(C) �aw�

(D) �aw�

The aqueous solutions of copper sulphate and zinc sulphate appear

(A) blue and green respectively

(B) green and colourless respectively

(C) blue and brown respectively

(D) blue and colourless respectively

27. W �' � � � m � � fclwR � � .am 31 � sPrn: I, IIcf III � � � I � fclwR # � � Q(jf1lf.Ml4 � sIB � I � �

1

��cfl8"� qftqJ..j -iw:rr� 1

(A) I 3W II#

(B) II� III#

(C) III� I#

(D} � #

Solutions of copper sulphate, iron sulphate and zinc sulphate are

prepared and marked I, II an� III respectively. Few pieces of aluminium

are added to each solution. After some time a change will be observed in

(A) I and II

(B) II and III

(C) III and I

(D) All the three

28. q{{sHffi if 2 n1L � � m � 2 mL Q«lR.i:h � � 7l1TT 3m: � cfi8in:��Tr:JTfcli 1

(A) ������Tr:JTt

(B) TIBf � � � � � t

(C) -ey � � � � �

(D) � � � -rt� ,m Ri:hciffi �

On adding 2 mL acetic acid to 2 mL of water in a test tube, it was observed that

(A) a clear and transparent solution is formed

(B) a white precipitate is formed almost immediately

(C) two separate layers were formed

(D) a colourless and odourless gas is evolved

29. � q{(sj,-tffi if BlfullJ.J �1$�1"1.-1 chl��2 if Q«lR.ch � � in: � � � �� t fcli 1

(A) � an� �QlcTT

(B) � -rt� � � � Rcf>W1l �

(C) � 3fR � � t � � i

(D) ftM; � � � 3JTffi t

On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes

(A) no reaction

(B) a colourless gas with pungent smell

(C) bubbles of a colourless and odourless gas

(D) a strong smell of vinegar

30. QB1k&; 3:pz;f � � # � � � � # � � � � � ?

(A) � m f<-i2.4ft cfil BIB��� an-{��� Ti� a:rrnT �

(B) � m f<-iVlB cfil BIB��� an-{���� Ti� 3mTT �

(C) � BIB f<-i2.4ft c.h1 � � � � an-{ � � � Ti� a:rrnT �

(D) � � fciVH-1 c.h1 � � � � an-{ � � � Ti� a:rrnT �

Which one of the following are the correct observations about acetic acid?

(A) It turns blue litmus red and smells like vinegar

(B) It turns blue litmus red and smells like burning sulphur

(C) It turns red litmus blue and smells like vinegar

(D) It turns red litmus blue and has a fruity smell

31. M � cfil � 1R M � � cfiT SI@�� � � � � � � �

1

� � Rmmf cfwTT � I � im:uwl � cfiB � � � !i)q;foa cfivTT � 1

(A) � � � 3Nqf � cfiT mm

(B) � �-tjr@ � � �

(C) ������fl@

(D) si4Ji1�m.11 � � � � � 1R � l414iil'dl � �

A student has to determine the focal length of a concave mirror by obtaining the image of a distant object on a screen. For getting best result he should focus

(A) a distant tree or an electric pole

(B) a well-illuminated distant building

(C) well-lit grills of the .nearest window

(D) a burning candle placed at the distant edge of the laboratorytable

32. fc.fim � � � � � cfiT � cf � >l@�ki � � � ml'.R & � 1:R�� I ��m�q;)��#�cfif>l<lrn� I 3W��

��

1

(A) � � ml'.R 00 1:R 3Wlf� �m,r >l@�ki

CB) � # � cfiT mm � � >1fa�ki

(C) cfil"{ >l@�ki � � WT � W � 7r:IT �

(D) � � � 1:R � cfiT � � cf � >l@�ki

A student obtained a sharp inverted image of a distant tree on a screen placed in front of the concave mirror. He then removed the screen and tried to look into the mirror. He would now see

(A) a very blurred image on the wall opposite to the mirror

(B) an erect and magnified image of the tree in the mirror

(C) no image as the screen has been removed

(D) a highly diminished inverted image of the tree at the focus of themirror

aa. � � � � m:r � � � � � t, m � llm � �

(A) � � "ffil 3W W

(B) � � "ffil 3W m:r cfiT �

(C) m:r cfiT �, � cfiT � 3W � �

CD) � � m=r, � w, � m � � 3fu: � �

If you are to determine the focal length of a convex lens, you should have

(A) a convex lens and a screen

(B) a convex lens and a lens holder

(C) a lens holder, a screen holder and a scale

(D) a convex lens, a screen, holders for them and a scale

34. cfiRf � 341llolcfil{ � � � � 9@t "5fcflm � c.fiT � 3ffifu@qi8 � ffl cfiT

cnm � � m5f �<ft�� si14'r1cti � #� i:iftUTl1l >TJ1'.<i � 1

�\ � p2 m5f � � � fr.RT cfil � �

0P1 0P1' ' ' ' ' ' ' ' ' ' ' 0P1 ' '

0P1' ' ' ' '

D D D I II III IV

(A) I

(B) II

(C) III

(D) IV

While performing the experiment on tracing the path of a ray of light

through a rectangular glass slab, in which of the following experimental

set-ups is a student likely to get best results ?

P 1

and P 2

are the positions of pins fixed by him.

(A) I

(B) II

(C) III

(D) IV

1

35. � � � � � dii4ciic:fiR � � � � fl � ch1 mUT � � ���3TIWo�I

�m;f��3TIWo����chl��WTTcRTt?

(A) I

(B) II

(C) III

(D) IV

Four students showed the following traces of the path of a ray of light

passing through a rectangular glass slab.

The trace most likely to be correct is that of student

(A) I

(B) II

· (C) III

(D) IV

1

(J 0 (J 6 rt I II III IV V

�@am!

(A) I, II, III

(B) II, III, IV

(C) III, IV, V

(D) I, IV, V

Following diagrams were drawn by different students on having seen

prepared slides of budding in yeast.

I II III IV V

Correct- diagrams are

(A) I, II, III

(B) II, III, IV

(C) III, IV, V

(D) I, IV, V

1

37. � � � � 3Tiffl � � � � 7T'1T t?

(A) I

(B) II

(C) III

(D) IV

In which of the following figures is budding not shown ?

(A) I

(B) II

(C) III

(D) IV

I II III IV

���t

(A) III, II, IV, I

(B) III, IV, II, I

(C) II, in, IV, I

(D) IV, III, II, I

The following figures illustrate binary fission in Amoeba in an incorrect

sequence.

I II

The correct sequence is

(A) III, II, IV, I

(B) III, IV, II, I

(C) II, III, IV, I

(D) IV, III, II, I

III IV

1

(/) '

'

.

.

I

(A) I, II, III

(C) V, II, III

II III '

IV

(B) IV, II, III

(D) IV, I, III

V

From the following diagrams, select the correct ones showing stages of binary fission in Amoeba

I

(A) I, II, III

(C) V, II, III

III '

.

.

'

'

IV

(B) IV, II, III

(D) Iv, I, III

V

40. M � � � fcfi�lfil�TI cl11' � � 'qr{ 'x' � � I � m � r.h�lfl4�TIcl11' 3TIWf � � N7WTT I � 2 � � � m r.h�lfil�n qi) � � RchlWM� � � m � � 3ffi � 'qr{ qi) 'y' � � I r.h�lfil�ri mT �cl�Tiftta �Ch1 5lfcrnaa1 "chT � cf>8 � ,fu"Q: � � \jfR q@T � mrIT

(A)

(C)

y - X

X 100 y

y-x 1 --x-x 100

(B) y - xx 100 ·

X

(D) (y - x) x 100

A student weighed some ra1sms and recorded the weight as 'x'. She then soaked the raisins in distilled water. After about 2 hours she removed the raisins, wiped them dry and weighed again and recorded that as 'y'. The percentage of water absorbed by raisins may be determined using the relationship

(A)

(C)

y-xX 100

y-x 1 --x-x 100

(B)y- x

x 100X

(D) (y - x) x 100

41. 1%�,fil�ri IDU �q�i)ft.!a � q,l" siRwiaa, mfftf cfi8 � m # � 1%�,fil�ri cfil � 1 � clcfi � # � � � � � � lTT1:ffi t t 1:fRUTTrf q,l" qf<u..s:a, � �, $rr � 1%�1f'4�ri � � � � � � � � � 1

(A) � � � �(B) 1f+f � � (�3R) IDU

(C) � � IDU

(D) � � (it-en:) IDU

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by

(A) rubbing with cotton cloth

(B) hot air blower

(C) dry cotton wool

(D) filter paper