10 Science Sa 2 Sample Paper Unsolved 01

8/11/2019 10 Science Sa 2 Sample Paper Unsolved 01

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SUMMATIVE ASSESSMENT II

SCIENCE

Class X

Time allowed: 3 hours Maximum Marks: 90

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) There is no overall choice. However, internal choice has been provided. Only one option in

such questions is to be attempted.

(iv) All questions of Section-A and all questions of Section-B are to be attempted separately.

(v) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in

one word or in one sentence.

(vi) Question numbers 5 to 11 in Section-A are two marks questions. These are to be answered in

about 30 words each.(vii) Question numbers 12 to 23 in Section-A are tree marks questions. These are to be answered

in about 50 words each.

(viii) Question numbers 2! to 2" in Section-A are #i$e marks questions. These are to be answered

in about "0 words each.

(ix) Question numbers 2% to !3 in Section-B are multiple choice questions based on practical

sills. !ach question is a one mark question. You are to select one most appropriate response

out of the four provided to you.

S&'(I)*-A

1. "rite the names of alenes havin# two and three carbon atoms respectively.

2. $tate the nature of the ima#e formed at the retina of human eye.

3. "hat is meant by %&' copyin# ention its importance in reproduction

4. "rite two advanta#es of ve#etative propa#ation

5. 'n element *+placed in nd #roup and -rd period of the modern periodic table, burns in air

to form a basic oide. /dentify whether the element is a metal or non0metal and write its

atomic number and confi#uration. 1ustify your answer.

6. 2There is an anomaly when it comes to the position of hydro#en in the modern periodic

table3. $tate any two reasons.

7. $tate any two differences between binary fission and multiple fission.

8. ore comple or#anisms cannot #ive rise to new individuals throu#h re#eneration. "hy

9. "hat is meant by radius of curvature of a spherical mirror How is it related to the focal

len#th of the mirror

10. (a) "hat is the near point of the human eye with normal vision

(b) "hy is a normal eye not able to see clearly the ob4ects placed closer than the near point

11. The sun appears oval (or flattened) at sunrise and sunset, but appears circular at noon.

!plain, why

12."hy do we need to build lar#e dams 5ist four reasons. "hat are their demerits


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13. 26urnin# fossil fuels is a cause of (i) acid rains and (ii) #lobal warmin#3. 1ustify this

statement.

14. (a) "hy are deter#ents considered more useful than soaps these days $tate one reason only.

(b)%raw electron dot structure for Oy#en molecule.

(c) $elect alanes from the followin#7 8H9 , 8:H; , 89Hmetals (iii) &oble #ases and (iv) etalloids in the

odern =eriodic Table.

16. $tate the reasons for adoptin# contraceptive methods. 5ist four methods of contraception.

17. /n a cross between plants with purple flowers and plants with white flowers the off sprin#s

of ?; #eneration all had white flowers. "hen the ?; #eneration was self > crossed, it was

observed in the ? #eneration that out of ;@@, A: flowers were white. ae a cross and

answer the followin# 70

(a) what are the #enotypes of the ? pro#eny

(b) "hat is the ratio of "hite 7 =urple flowers in the ? #eneration

18. (a) !plain Beo#raphical isolation.

(b) Bivin# reasons state whether the followin# are Homolo#ous or 'nalo#ous or#ans 70

(i) "in#s of butterfly and win#s of a bat (ii) forelimbs of fro# and human.

19. 5oo at the #iven picture and write its name. 'lso #ive its si#nificance in

the study of evolution of or#anisms.

20. 'n ima#e C-rd the siDe the ob4ect is formed by a conve lens at a distance of

;cm from it. ?ind the focal len#th of the lens.

21. %raw ray dia#ram and describe the nature of the ima#e formed by a concave mirror when

the ob4ect ept 7

(a) between pole and focus of the mirror(b) 6etween infinity and centre of curvature of the mirror.

22. ' student has difficulty in readin# the blac board while sittin# in the last row "hat could

be the defect the student is sufferin# from How can it be corrected

%raw the ray dia#rams for (a) defective eye (b) its correction.

23. (a) "hat happens when a pollen #rain falls on the sti#ma

(b) %raw a well labeled dia#ram showin# #ermination of pollen #rain on sti#ma .

24. (a) &ame the followin# compounds (i) 8H-08H08H-(ii) 8H-8HO

(b) (i) 8omplete the followin# equation 8H-8HOH E O00

(ii) &ame the above reaction

(c) %raw the structure for 6enDene.

OR

(a) How can an ester be prepared in laboratory "rite the chemical reaction involved in

its preparation.

(b) !thanoic acid is also nown as #lacial acetic acid. "hy

(c) 5ist two differences between saturated and unsaturated hydrocarbons.

25. %raw a neat dia#ram of lon#itudinal section of a flower showin# #rowth of pollen tube and

label on it the followin# 7 (i) ovary (ii) style (iii) sti#ma $tate in brief the functions of these

parts.

OR(a) &ame the parts of flower which contain #erm cells.


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(b) "hat is the difference between self0pollination and cross pollination

(c) Testes are located outside the abdominal cavity. "hy

(d) ?ertiliDation is possible if copulation has taen place durin# middle of menstrual cycle.

Bive reason.

(e) "hat happens when the e## is not fertiliDed

26.(a) %efine power of a lens.(b) 'n ob4ect is ept at a distance of ;


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(a) ' and 6 (b) 6 and 8

(c) 8 and % (d) % and '

31. : m5 each of acetic acid and water are mied to#ether in a test tube. On shain# the miture

it is found that the dia#ram depictin# the correct observation is 7

(a) / (b) //

(c) /// (d) /

32. "hen sodium hydro#en carbonate powder is added to acetic acid, a #as evolves. "hich one

of the followin# statements is not true for this #as /t 7

(a) turns lime water mily.

(b) etin#uishes a burnin# splinter.

(c) turns red litmus blue.

(d) is a colourless and odourless #as.

33. To ?ind focal len#th of a conve lens in laboratory, ano4 fied it on a stand and ept it on a

mar of ;:.- cm an optical bench. To #et a clear ima#e of a distant tree, he ad4usted a screenand finally #ot clear ima#e when screen was placed at -.: cm. ?ocal len#th of the lens is 7

(a) -.: cm (b) ;A. cm

(c) -9.9 cm (d) 9A.< cm

34. ' teacher held a pencil close to a spherical mirror and ased four students ', 6, 8, % to

identify the nature with the help of ima#e that formed in the mirror. /t was erect and

enlar#ed. The students identified it the mirror as 7

(') conve in nature. (6) concave in nature.

(8) plane mirror (%) plane at the center and concave from ed#es

8orrect identification was done by

(a) ' (b) 6

(c) 8 (d) %

35. "hile tryin# to identify conve lens from a #roup of #lass pieces lyin# on a table, 'sha found

that there is lens that always forms a virtual and diminished ima#e. The ind of this lens is 7

(a) plane conve lens (b) double concave lens

(c) double conve lens (d) plane #lass sheet


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36. /n an eperiment to trace the path of a ray of li#ht passin# throu#h a rectan#ular #lass slab,

the correct measurement of an#le of incidence (i), an an#le of refraction (r) and an#le of

emer#ence (e) is shown in dia#ram

(a) ' (b) 6

(c) 8 (d) %

37. "hile performin# the eperiment on tracin# a ray of li#ht passin# throu#h a rectan#ular

#lass slab, the inference #iven by four students after measurin# an#les of incidence,

refraction and emer#ence is as IIIIIIIIII .

(a) an#le of refraction is #reater than an#le of emer#ence

(b) an#le of refraction is equal to an#le of emer#ence

(c) an#le of incidence is #reater than an#le of emer#ence

(d) an#le of incidence is equal to an#le of emer#ence

"hich student has #iven correct inference

(a) ' (b) 6(c) 8 (d) %

38. "hich of the followin# represent binary fission in amoeba 7

(a) (i) (b) (ii)

(c) (iii) (d) (iv)

39. 'fter students had observed the slide of binary fission of amoeba, a teacher ased her

students why this process was called binary fission. Out of the four statements #iven by

different students, which one is the correct one

(a) One parent cell divides into two dau#hter cells.

(b) Two dau#hter cells combine to form one new cell.

(c) One parent and one dau#hter cell are involved in the process.

(d) Two parent cells combine to form dau#hter cells.


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40. "hich one of the followin# does not represent buddin# in yeast

(a) ' (b) 6

(c) 8 (d) %

41. Out of the #iven dia#rams, the correctly labelled dia#ram showin# buddin# in yeast is 7

(a) / (b) //

(c) /// (d) /

42. $tudents ', 6 and 8 were #iven five raisins of equal wei#ht. The raisins were soaed in

distilled water at room temperature. ' removed raisin after @ minutes, 6 after two hours

and 8 after 9@ minutes. /f =', =6 and =8 denote percenta#e absorption of water, obtained by

students ', 6 and 8 respectively, then 7

(a) =' J =6 J =8 (b) =' K =6 K =8

(c) =' K =6 J =8 (d) =' J =6 K =8

43. /f *+ represents wei#ht of soaed raisins and *Y represents wei#ht of dry raisins then

100x y

y

is a way to calculate percenta#e of

(a) water absorbed by raisins in hypertonic solution.

(b) water absorbed by raisins in hypotonic solution.

(c) water lost by raisins in hypotonic solution.

(d) water lost by raisins in hypertonic solution.

10 Science Sa 2 Sample Paper Unsolved 01

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