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31" . : 11r TAG OR E IN T . E•• .• ..R. . .N .. A T ,. . .O...·N.·.ALSCHOOL .cil<R{ ~ ~ . -. - - _ _ -

.:1JJ~;'H, VASANTVIHAR , N . DELH I

SUMMATIVEASSESSMENT II

SCIENCECLAS$,XSet I(

. Da te :01.03.12No. O f pa ge s:O S

Tim e: 3 Hrs,Max.Marks:80

General Instructions1 . Th e q ue stion p ap ercomprisesof two sections, A and B, you a reto a ttem pt b oth th e se ctio ns.2 . A llque s tions a re compu ls or y

3 . The re is no ove ra ll Choice . How eve r, inte rna l choice ha s be en provide d in the e ntire thre eq ue stions of five m a rk ~ ate gory. O nly one optionin such q ue stion is to b e a tte m pte d.4 . AU questions of section A and aU questions of section B areto be 'a ttemp ted s epa ra te ly.5 . Q uestion num bers 1 to 4 in section A, are one m ark questions. These a re to be answ ered in onew ord or one se nte nce .

6. Ques tion numbe rs5 to 13 a re two m ark questlons,to be answered in about30 words.7 . Q ue stion num be rs 14 to 2 2 a re three m ark-que stlons, to be a nsw ere d in a boU t 50 w ords.8. Que stion numb ers23 to 25 a re five m arkques tions , . tobe answered in about7Jlwords.9. Que ,s tion numbe rs26 to 41 in s ectio n B are m ultiple choice questions based on practica lskllls,Each ques tio n isa one m arkquest ion.You are tochoose 6~ most a pp ro pria te re sp on seout o f the four provided to y ou. .

10./ (n add it iona l15m inute s tim e ha s bee n a llotte d to re ad th is question' pa pe r only.

/ SectionA

fil{ Lis t twomaincomponentso f ourenvironment .

~ ~ffne th e te rm b io lo gica lm a g nifica tio n.

(1 ma r k)

(1 ma rk ),;,

(1ma r k ) :3 . W hen 9 beam of w hite light passes through a glass prism , state the com ponent of white. lig h twhichd e v ia te s th e( i}I~st (ii)~t

, .. 9 t Y.S atura te d h yd ro ca rb ons b urn w ith a blue flame while uns atura te dhydrocarbonsburn with

a soo tyf lame.Why?

0 5. S ug ge st tw o im porta nt m e asure s to re duce co nsump tio n of theva rious na tu ra lresources. (2 m arks)

(1 ma rk )

~ List any two reasonsfo r adop ting con tracept iv e methods, (2marks )

Q7. ( i)Whydoes th e s unappear redd ishearlyin th e mo rning ?py d oe s th es ky a pp ea rdark in st eadof blue to an a s tronau t?

(2 marks )

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,/., '.

/Q 8. Anobje ct is p la ceda t a d is tanceof 10 e mfrom a co nca ve m irro r.If its im a ge is o bs erve d(2 marks).:',' a t 6cm from th e m irro r, ca lcula te fo ca l le ng th o f th e m irro r.L( '. --_~< i :'~) ,

.. _ ., . ,.'___ "\t"._: ·_if£,.?~_-::

Q9.8un is the uliim atesource of energy ()ffossil fuels,jl)stify thisstate tilenL (2 m arksWritetwodisadvantagesof using fossilfueis. '

010. (i) Write the va lue s of fa r p oint a nd ne ar po int of the hum a n(ii) W hat happens to the im age distance. from the eyewe increase the distance of an object from the eye?

011 . Illustrate the process of rege neration in P lanaria w ith the he lpofasuitable rlbr.;-'lrn

1 2. Th e fo llowin g ta ble s hows e lements re pre se nte d b y th e le tte rsA,B, C, 0, E, F , G, andlLGroup 1 2 13 14 15 16 17 18Element ABC 0 E F G H(i )Which of the elem ents has the a tom ic size(a ) B ig ge st a nd (b ) smalle st?(ii)Wh ich e lemen t h as v ale ncy (a )3 and (b) zero?

013 . 8 ta te Mode rn P eriodic Law. H ow ma ny group sand p erio ds a re th ere in th e mode rnPer iod ic table?

(2marks)

014 . (3 ma rk s)

Name the parts A, Band C shownin the give n diagra m and sta te one function of ea chpart.

015. B rie fly explain the role of natura l selection and gene tic drift in specia tion by citing an(3 marks)example.

016 . Descr ib e any t hr ee me thod s o f tr ac in g evo lu tio na ry r ela tio ns hip s among o rg an isms.(3 ma rk s)

'Q17 . How do prote ins control the cha ra cte ristics th at a re inhe rite d? Ex pla in w ith the he lp of a n(3 marks)example.

Q18. (i )Define powerof a lens and w rite itsS.I unit (3 marks)(i i )A co nv ex le ns o f p ower40 is pla ce d a t a d ista nce o f40 cm from a wall. At whatdistance from the lens should a ' candle be placed so that its im age is form ed onthe wall )t,

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01 9. A person is una ble to se e obje cts ne arer than50 em . He wants to read a book placed at a (3 m arks)dista nce o f 2 5 cm . N am e th e d efe ct o f visio n he is suffe ring from. H ow ca n it b e co rre cte d?D raw ra y d ia gram s fo r( i)t he d efe ctiv e eye(ii) Its cor re ct io n us ing a suit ab le co rr ec tiv e lens .

Q 20. (a ) With the help of a ra y diagram show tha t w he n light fa lls obliquely on a sideof a (3 m arks)re ctangula r g la ss s lab , th e eme rg en t ray is p ar alle lto th ein cid en t r ay.

(b) The refractive index of w aterfor light going from air to water is 1 .33. F ind theR efra ctive ind ex o f a ir fo t a b ea rn o f lig ht gOJngfrom wate r to a ir.

Q 21 . Wh a t is h yd ro ge na tio n? S ta te o ne ind us tria l a pp lica tio n o f th is re actio n w ith a n a pp ro pria te (3 ma rkequation.

Q22 . An elem ent X placed in 2nd group a nd4 thperiod of the periodic table burns in the (3 m arts)p re se nce o f ox yg en to form a b asic ox id e.( a) Ident ify the e lemen t(b ) Wri te i ts e lectronic conf igurat ion .

(c) Wr ite a b ala nce d e qua tio n fo r th e re actio n when· t his o xid e is d is so lv ed in w a te r.Q23. (a) W hat is placenta? Mention its role d uring pregnancy. (5 m arks)

(b) W hat will happen if the egg is not fertilized? .(c) C olo nie s o f y ea st fa il to multip ly in w ate r, b ut multip ly in s ug ar s olutio n. G iv e o ne

re a so n fo r t his .. O R

(a ) Wh at is v eg eta tiv e p ro pa ga tio n? How is it a dva nta ge ous ? G iv e s uita ble e xample .. (b) How ~ill an orga~ism?e benefittedif i.tre pro~ uce s thro ugh EB ore s? .0. h Y i-

( c) HowIS reqeneraton different from fragm entatton? 13e.n e dI ~

Q24. ~am e the type of lens use~ to o ?ta in : .. .,C ; ;n 'je""" ~:r

p . _ (5 ma rks )(I )An e re ct, e nla rg ed a nd v irtua l Im age o f a n o bje ct.13i /'1 ,< 7k 0ly' ~- ni(e(ii) A n e re ct, d im inis he d a nd v irtua l im age o f a n o bje ct.f~ Yl ( .kA'Ve Le,II'~.Draw labelled ray diagram s to show the form ation of im age in each case. W hich ofthe se le nse s could also form a m agnified and rea l im age of the obje ct? Sta te the positiono f th e o bje ct fo r which th is co uld h ap pe n.

O R

Draw a ray diagram in each of the follow ing cases to show the position and natureof im age form ed w he n the obje ct is pla ced:' C J .u., j,! ~ lbY v {/)_-t iror .or.6i~'l;?__t(i) B etw ee n p ole a nd focus o f a conca ve m irro r.B e kw. . . D-< Iice VY (' _k; ej/ e -r ./(ii) B etw een fo cus a nd ce ntre o f curv ature . o f a co nca ve m irro r.(iii) At the centre of curvature of a concave m irror(iv ) B etw een infinitY and p ole o f a co nv ex m irro r.0

() t i fi 't f . '._ r: ; '/I I Aft = -"r""-V a In tn l y rom a convexrmrror j f t;,l..::. !/[, /?O --/YUJ rrHtf(f a b'(/

025. (a) W hat is soap chem ically? Explain the form ation of m icelles. Also, draw a diagram of a (5 m ark

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OR

micelle.(b )Howwilly o utest.th e h ard ne ss o f wate r w ith s oa p?

{a} An organic compound X reacts with sodium m etala gasY .Id entifyX and Y .

(b ) VVhat h ap pe ns whe n e fh arro lish ea te d a t 4 43K w ith co ne .H2S04(c )Wr ite th echemical equationto illust ra te es te r if ica tion reac tion .(d )Drawth e s tr uct ar e o fEthanoiCacid.(e) Nam e the chem ical you would use to distinguish experim entaUy between an

a lco hol a nd a ca rb ox ylic a cid .

S ec tio n B

Q26. A cha in of ye ast cells form s beca use:

( a )Ye ast ce lls do not separa te afterb u d d i h g(b )Daughte r cells a re una ble to survive w ithout pa re nt ce lls( c )Buds reproduce as soon as they are form ed(d )Daughter ce lls stick together with the he lp of mUCl)S

(1mark)

f:":}(b) c : : : ._ ) .- ~ .\~J

. E;P .(1mark)

(0)8 (d)

Which one out of toe aboved i a q r am scor reo tly depict s r ep roduction in Amoeba?• ( a )A(b ) B(ciC(d ) D

028. 59 of ra isins were placed in50 ml of d istille d waie rfof2 hours. Theweightof soaked (1 mark)

raisins was found to be 79. The correct percentage of water absorbed by raiSins is:

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·~'1 0-

. . .: ._. . , ._"_ ' ' . .=W :!~1 0 0

. (c )

Q29 . Astudent observed a slide ofyeastunder 'a m icroscope a nd saw colle ction' of ce lls(1mark)in differentpa rts of th e s lidemarke dA,B ,C . and0 as shown below :

~/~;;~~-~l~ C~(b f~jf1~\1, ,c 13 . ' 1

\lk:: I I ~t-/~-"--, .i.>W h . iy ho f the fo llOiNingpartsof th e slid e sh ow s p ud ding in ye ast?(a )A(b) B. (c) C(d) 0

Q30. Following diagram s were drawn by four different students on having observeda (1mark}p rep ar ed s lid e o f buddingin yeast

The co r rec t lydrawn dia gram (s)i s / a re :

I(a ) Ionly~ (b ) IIand III(c )H and IV(d )lflnd IU

Q31. One of th e precautionslor th ~ exp eriment :To determ ine the percentage of water(1mark)absorbed b y ra is in s is ,.....Wipe.the soaked raisins gently using a ' filter paper beforetakingfinalmass .This precaut ion is importanta s it e ns ure s th at:

II I II

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,,(a ) O nly the w ater a bsorbe d by the ra isins is w eighed(b) H ands do not ge t .w et(c) Sca le pa n does notgetw et(d )The r ais in s lo se wa te r b efo re we ighing.

032. In an experim ent on tracing the path of a ray of light through arectangulargla~ssl~b, (1mfour s tudentsA,B,C,Ou se d th e fo llowin g v alu es o f a ng le o f ine id en ce an d. th e d is ta ncebetween the feet of the two pins (fixed on the incident ray) : .(A )(3 00,4 50600) and 1 em(8 ) ( 3 0 0 ,450,600) and 6cm ,(C ) ( 2 ( ) o ,500,8 00) and 2 cm(0 ) ( 2 0 0 ,500,8 00) and 5 cmO ut of these the best choice is that of student(a )A(b) B(c )C

. (d ) 0

033. P ara llel ra ys from a dista nt tre e incident ona concave m irror, form s an im age on the(1mark)screen wh ichis :

,(a) Real, inver ted and d imini shed .(b ) Vir tu al, e re ct and d im inished.(c) R ea liinver ted and en la rged.( d) Virtu al, e re ct and enla rg ed .

Q34. Outof the four set ups shown for carrying out the experim ent to trace the path ora ray of (1mlight through a re ctangular glass sla b the be st se t up is

C-j,

t.

...................= ~ JDD •..• ~,l. I: i'

L~~." __ .~"JDc

(a )A. ( b ) B(c )C(d ) 0

Q 35. Asha rp im a ge o f a d ista nt ob je ct is o bta ine d o n a scre en usinga convex lens.In o rd er to (1mark)determ ine the focal length of the lens, the student needs to ll1easuJethedistancebetween:(a )Len sand lh e object.(b ) Le ns a nd th e S cre en .. (c ) Ob ject and th e- sc re en.(d ) Le ns a nd th e scre en a nd a lso ob je ct a nd th e scre en.

6Se t 2



(a )A and B.(b ) C and D(c )A and C(d) Band D

039. Dilute ace tic acid was added to the four beakers conta ining(I) NaC I (II) NaHC03(II!)K OH (IV) K2C03Briske ffe rv esce nce a nd e vo lution of colourle ss ga s w as ob se rv edin th e be ake rs :(a ) I and 1 1(b) IIand III(c)H Iand IV

; . ( d ) I I a n dIV

040 . 5m l of a qe tic acid wa s a dded to 5m lof wa te r in a te st tube . Afte r sha king the m ixture and< (1mark)k ee ping it und isturb ed for a bout 1 0 m inute s it is ob se rv ed th at:(a ) The m ixture turnsre d(b ) A strip of red litm us paper dipped In the m ixture turns blue(c ) Two separa te laye rs of wa te r and ace tic acid are seenin the te st tube .

,,(d) A cle ar so lution h aving vine ga r lik e o do ur is form e d

Q41.Amittooka blue coloured solu tion ina te st tube . In this solution he pla ce d an alum inium (1ma rpla te a nd a fte r a bout 2 hours he ob se rve d a re ddish brow n de posit on th e a lum inium pla te .On the basis of th is observa tion he m ay conclude tha t the solution couldbe of a saltof:(a ) sodium(b ) i ron

(C )copper·(d) z i n c

, , * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

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