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Paper: Science X Summative Assessment Term I Sample Paper - 1
Total marks of the
paper:90
Total time of the
paper:3. hrs
!eneral Instructions:
1. The "uestion paper comprises of t#o sections$ A an% & 'ou are to attempt (oth
the sections.
). All "uestions are compulsor'.
3. There is no overall choice. *o#ever$ internal choice has (een provi%e% in all thethree "uestions of +ve marks cate,or'. nl' one option in such "uestion is to (e
attempte%.
. All "uestions to section A an% all "uestions of section & are to (e attempte%
separatel'.
. /uestion num(ers 1 to 3 in section A are mark "uestions. These are to (e
ans#ere% in one #or% or one sentence.
. /uestion num(ers to are t#o marks "uestions$ to (e ans#ere% in a(out 30#or%s.
. /uestion num(er 2 to 19 is three mark "uestions$ to (e ans#ere% in a(out 0
#or%s.
2. /uestion num(er )0 to ) are +ve mark "uestions$ to (e ans#ere% in a(out 0
#or%s.
9. /uestion num(ers ) to ) in section & are multiple choice "uestions (ase% on
practical skills. ach "uestion is a one mark "uestion. 4ou are choosin, one most
appropriate response out of the four provi%e% to 'ou.
10. An a%%ition 1 minutes time has (een allotte% to rea% this "uestion paper onl'.
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/uestions:
15 A non-metal X e6ists in t#o %i7erent forms 4 an% 8. 4 is the har%est
natural su(stance$ #hereas 8 is a ,oo% con%uctor of electricit'. I%entif' 4
an% 8.
arks:
15
)5 ;hat is the minimum resistance #hich can (e ma%e usin, +ve resistors
each of 1
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5Three ) resistors$ A$ & an% >$ are connecte% as sho#n in ?i,ure. ach of
them %issipates ener,' an% can #ithstan% a ma6imum po#er of 12 ;
#ithout meltin,. ?in% the ma6imum current that @o# throu,h the three
resistors. arks:35
25 !ive the events that occur %urin, photos'nthesis. arks:
35
95 escri(e the steps involve% in re@e6 action. arks:
35
10
5
;rite chemical e"uations for the reactions takin, place #hen
BiC Dinc sulphi%e is heate% in air
BiiC calcination of Dinc car(onate is %one
BiiiC #hen man,anese %io6i%e is heate% #ith aluminium po#%er
arks:
35
115
BaC ;h' %o #e store silver chlori%e in %ark coloure% (ottles=
B(C *o# %oes slake% lime is prepare% from calcium o6i%e.
arks:
35
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1)
5
;rite the (alance% chemical e"uations for the follo#in, reactions:
BaC So%ium car(onate on reaction #ith h'%rochloric aci% in e"ual molar
concentrations ,ives so%ium chlori%e an% so%ium h'%ro,en car(onate.
B(C So%ium h'%ro,en car(onate on reaction #ith h'%rochloric aci%
,ives so%ium chlori%e an% li(erates car(on %io6i%e.
arks:
35
13
5
A stu%ent prepare% solutions of BiC an aci% an% BiiC a (ase in t#o separate
(eakers. She for,ot to la(el the solutions an% litmus paper is not availa(le
in the la(orator'. Since (oth the solutions are colourless$ ho# #ill she
%istin,uish (et#een the t#o=
arks:
35
1
5
;hat happens at the s'napse (et#een t#o neurons= arks:
35
1
5
BaC *o# much current #ill an electric (ul( %ra# a ))0E source if the
(ul( +lament is 1)00 =
B(C *o# much current #ill an electric heater %ra# from a ))0E source if
the resistance of the heater is 100 =
arks:35
1
5
Fame various plant hormones. !ive one function of each. arks:
35
1
5
;hat %oes the %irection of thum( in%icate in the ri,ht-han% thum( rule= In
#hat #a' this rule is %i7erent from ?lemin,Gs left han% rule=
arks:
35
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12
5
;hat is (iomass= 6plain the principle an% #orkin, of a (io,as plant usin,
a la(ele% schematic %ia,ram.
arks:
35
19
5
BaC ;h' %oes a current carr'in, con%uctor kept in a ma,netic +el%
e6perience force= n #hat factors %oes the %irection of this force %epen%=
Fame an% state the rule use% for %etermination of %irection of this force.
B(C A ma,netic compass sho#s a %e@ection #hen place% near a
current carr'in, #ire. *o# #ill the %e@ection of the compass ,et a7ecte%
if the current in the #ire is increase%= Support 'our ans#er #ith a reason.
H
BaC ;hat is the function of an earth #ire= ;h' is it necessar' to earth
metallic appliances=
B(C T#o circular coils A an% & are place% close% to each other. If the current
in the coil A is chan,e%$ #ill some current (e in%uce% in the coil &= !ive
reason.
arks:
5
)0
5
BaC Salt A commonl' use% in (aker' pro%ucts on heatin, ,ets converte%
into another salt & #hich itself is use% for removal of har%ness of #ater a
,as > is evolve%. The ,as > #hen passe% throu,h lime #ater turns it milk'.
I%entif' A$ & an% >.
B(C ;rite an' t#o uses of (leachin, po#%er
H
BaC ;rite #or% e"uations an% then (alance% e"uations for the reactiontakin, place #hen
BiC %ilute sulphuric aci% reacts #ith Dinc ,ranules.
BiiC %ilute h'%rochloric aci% reacts #ith ma,nesium ri((on.
B(C ;hat is a neutralisation reaction=
arks:
5
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BcC !ive t#o important uses of #ashin, so%a.
)15
BaC ;rite the electron %ot structures for so%ium ma,nesium an%o6',en.
B(C Sho# the formation of Fa) an% , (' transfer of
electrons.
BcC ;hat are the ions present in these compoun%s.
B%C ;h' %o ionic compoun%s have hi,h meltin, point.
H
!ive reason:
BaC Platinum$ ,ol% an% silver are use% to make Je#eller'.
B(C Aluminium is a hi,hl' reactive metal$ 'et it is use% to make utensils for
cookin,.
BcC Heaction of nitric aci% #ith metals ,enerall' %oes not evolve h'%ro,en
,as.
B%C >ar(onate an% sulphi%e ores are usuall' converte% into o6i%es %urin,
the process of e6traction.
BeC >opper is use% to make hot #ater tanks an% not steel Ban allo' of ironC.
arks:5
))
5
?in% out the follo#in, in the electric circuit ,iven in ?i,ure.
BaC 7ective resistance of t#o 2 resistors in the com(ination.
B(C >urrent @o#in, throu,h resistors.
BcC Potential %i7erence across resistance.
B%C Po#er %issipate% in resistor.
BeC i7erence in ammeter rea%in,s$ if an'.
arks:
5
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H
A current of 1 ampere @o#s in a series circuit containin, an electric lamp
an% a con%uctor of #hen connecte% to a 10 v (atter'. >alculate the
resistance of the electric lamp. Fo# if a resistance of 10 is connecte% in
parallel #ith this series com(ination$ #hat chan,e Bif an'C in current
@o#in, throu,h con%uctor an% potential %i7erence across the lamp #ill
take place= !ive reason. ra# circuit %ia,ram.
)3
5
ra# the %ia,ram of alimentar' canal of man an% la(el the follo#in,
parts:
K outh
K esopha,us
K Stomach
K Intestine
;here %o car(oh'%rates$ proteins an% fats ,et %i,este% in human (ein,s=
H
;hat is the a%vanta,e of havin, four cham(ere% heart= Support 'our
ans#er #ith a %ia,ram of the section of a human heart.
arks:
5
)
5
To stu%' the %epen%ence of current BIC on the potential %i7erence BEC
across a resistor H$ t#o stu%ents use% the t#o set ups sho#n in +,ure A
an% & respectivel'. The' kept the contact point L in four %i7erent marke%$
BaC$ B(C$ BcC$ B%C in the t#o +,ures
arks:
15
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?or the t#o stu%ents the ammeter an% voltmeter rea%in, #ill (e ma6imum
#hen the contact L is in the position:
A. B%C in (oth the set ups
&. BaC in (oth the set ups
>.BaC in set up A an% B%C in set
up &
.B%C in set up A an% BaC in set
up &
)
5
The p* values of %istille% #ater$ fruit Juice an% so%ium (icar(onate #ere
measure% usin, p* papers. ;hat is the correct %ecreasin, or%er of p*
values
arks:
15
A.;ater M ?ruit Juice M So%ium
(icar(onate
&.?ruit Juice M ;ater M So%ium
(icar(onate
>.;ater M So%ium (icar(onate M
?ruit Juice
.So%ium (icar(onate M ;ater M
?ruit Juice
)
5
In an e6periment to test the p*$ of a ,iven sample usin, p* paper$ four arks:
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stu%ents recor%e% the follo#in, o(servations.
Sample taken. p* paper colour turne% to.
BIC ;ater !reen
BIIC il. *>l He%
BIIIC il. Fa* &lue
BIEC il. Acetic aci% ran,e
;hich one #ill have p* value of =
15
A. II
&. III
>. IE
. I
)
5
A stu%ent performe% the starch test on a leaf. Some steps involve% are
sho#n (elo#.
The correct se"uence of steps shoul% (e:
arks:
15
A. $ >$ &$ A
&. A$ &$ >$
>. &$ >$ $ A
. A$ >$ $ &
)2
5
?our stu%ents stu%ie% reactions of Dinc an% so%ium car(onate #ith %ilute
h'%rochloric aci% an% %ilute so%ium h'%ro6i%e solutions an% presente%
arks:
15
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their results as follo#s. The GNG represents evolution of ,as #hereas GXG
represents a(sence of an' reaction$
The ri,ht set of o(servations is that of stu%ent
A. &
&. >
>.
. A
)9
5
A sample of soil is mi6e% #ith #ater an% allo#e% to settle. The clear
supernatant solution turns the p* paper 'ello#ish-oran,e. ;hich of the
follo#in, #oul% chan,e the colour of this p* paper to ,reenish-(lue=
arks:
15
A. Oemon Juice
&. Eine,ar
>. >ommon salt
. An antaci%
30
5
;hich one is not o(serve% #hen aluminium is a%%e% to solution of copper
sulphate=
arks:
15
A.The solution is (lue in the
(e,innin,
&.The +nal solution (ecomes
colourless
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>.A (ro#n mass is %eposite% on
the surface of Aluminium
.The +nal solution (ecomes li,ht
,reen
31
5
A more reactive metal %isplaces a less reactive metal from the a"ueous
solution of the latter. ?rom the follo#in, sets tell #hich one represents a
correct picture of (oth the possi(le BNC reactions an% impossi(le B6C
reactions (et#een metals an% the solutions of %i7erent salts.
arks:
15
A.etal Al)BSC3 >uS ?eS
B(C >u N 6 X
&.
etal Al)BSC3 >uS ?eS
BcC ?e N N X
>.etal Al)BSC3 >uS ?eS 8nS
B%C 8n 6 N X N
.etal Al)BSC3 >uS ?eS
BaC Al 6 N N
3)5
In the e6periment on +n%in, the e"uivalent resistance of t#o resistorsconnecte% in parallel three stu%ents connecte% the Eoltmeter in their
circuits in the three #a's X$ 4 an% 8 sho#n here.
The voltmeter has (een correctl' connecte% in.
arks:
15
A. cases X an% 4 onl'
&. cases 4 an% 8 onl'
>. cases 8 an% X onl'
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. all the three cases
335
I%entif' the circuit B?i,ureC in #hich the electrical components have (eenproperl' connecte%.
arks:
15
A. BiC
&. BiiiC
>. BivC
. BiiC
3
5
The rest positions of the nee%les in a milliammeter an% voltmeter #hen
not (ein, use% in a circuit are as sho#n in the +,ure. The Dero error an%
Gleast countG of these t#o instruments are.
arks:
15
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A.BmA$ -0.)EC an% B1mA$ 0.1EC
respectivel'
&.BmA$ -0.)EC an% B)mA$ 0.)EC
respectivel'
>.B-mA$ 0.)EC an% B)mA$ 0.)EC
respectivel'
.B-mA$ 0.)EC an% B)mA$ 0.1EC
respectivel'
3
5
T#o stu%ents BAC an% B&C connect their t#o ,iven resistors H1 an% H) in
the manners sho#n (elo#.
Stu%ent A connects the terminals marke% (1 an% c1 #hile stu%ent &
connects the terminals marke% %) an% c) in their respective circuits at the
points marke% X an% 4.
;hich one of the follo#in, is correct in relation to a(ove arran,ement
arks:
15
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A.
(oth the stu%ents #ill %etermine
the e"uivalent resistance of the
series com(ination of the t#o
resistors
&.(oth the stu%ents #ill %eterminethe e"uivalent resistance of the
parallel com(ination of the t#o
resistors.
>.
Stu%ent A #ill %etermine the
e"uivalent resistance of the
parallel com(ination #hile
stu%ent & #ill %etermine the
e"uivalent resistance of the
series com(ination of the t#o
resistors.
.
Stu%ent A #ill %etermine the
e"uivalent resistance of series
com(ination #hile stu%ent & #ill
%etermine the e"uivalent
resistance of parallel
com(ination of the t#o resistors
3
5
A #ell staine% leaf peel preparation #hen focuse% un%er hi,h po#er of the
microscope #oul%$ sho#
arks:
15
A.
epi%ermal cells$ stomata$ ,uar%
cell #ith man' nuclei an% one
chloroplast cell
&.stomata$ an% ,uar% cells #ithout
nuclei or chloroplasts
>.Stomata$ (ut no ,uar% cells or
epi%ermal cells
.
epi%ermal cells$ stomata$ ,uar%
cells each #ith one nucleus an%
man' chloroplasts
3
5
A stu%ent %ra#s the follo#in, sketch of stomatal apparatus the part I$ II$ III arks:
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an% IE are la(ele% %i7erentl' (' four stu%ents.
The correct la(elin, out of the follo#in, is
15
A.
I !uar% cell II
stoma
III starch,ranule
IE nucleus
&.
I !uar% cell II
starch ,ranule
III Fucleus IE
stoma
>.
I c'toplasm II
chloroplast
III stoma IE
nucleus
.
I >'toplasm II
nucleus
III stoma IE
chloroplast
32
5
!iven (elo# are four %i7erent set ups to sho# that >) is release% %urin,
respiration.
arks:
15
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A. A
&. &
>.
. >
39
5
;hat is the use of Q* solution in this e6periment=
arks:
15
A.A(sor(s ) release% ('
,erminatin, see%s
&. A(sor(s moisture release% ('the see%s
>. Fone of these
.A(sor(s >) release% ('
,erminatin, see%s
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0
5
To o(serve cells in an onion peel$ #e must prepare the sli%e (' mountin,
on it:
arks:
15
A. >rushe% pulp of onion
&. r' scale leaf
>. !reen leaf of onion
. Thin la'er of @esh' leaf of onion
1
5
&1$ &) an% &3 are three i%entical (ul(s connecte% as sho#n in the ?i,ure.
;hen all the three (ul(s ,lo#$ a current of 3A is recor%e% (' the ammeter
A.
BiC ;hat happens to the ,lo# of the other t#o (ul(s #hen the (ul( &1 ,ets
fuse%=
arks:
15
A.&) ,ets %immer an% &3 ,lo#s
(ri,hter
&.&3 ,ets %immer an% &),lo#s
(ri,hter
>. &3 an% &) (oth #ill ,lo# more
. The ,lo# of the (ul(s &) an% &3#ill remain the same
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Paper: Science X Summative Assessment Term I Sample Paper - 1
Total marks of the paper: 90
Total time of the paper: 3.5 hrs
General Instructions:
1. The question paper comprises of two sections, A and B you are to attempt both the sections.
2. A questions are compusory.
3. There is no o!era choice. "owe!er, interna choice has been pro!ided in a the three questions of fi!e mar#s cate$ory. %ny one option insuch question is to be attempted.
&. A questions to section A and a questions of section B are to be attempted separatey.
5. 'uestion numbers 1 to 3 in section A are mar# questions. These are to be answered in one word or one sentence.
(. 'uestion numbers & to ) are two mar#s questions, to be answered in about 30 words.
). 'uestion number * to 19 is three mar# questions, to be answered in about 50 words.
*. 'uestion number 20 to 2& are fi!e mar# questions, to be answered in about )0 words.
9. 'uestion numbers 25 to &2 in section B are mutipe choice questions based on practica s#is. +ach question is a one mar# question. ou
are choosin$ one most appropriate response out of the four pro!ided to you.
10. An addition 15 minutes time has been aotted to read this question paper ony.
Solutions:
1]
Y Diamond and Z Graphite
2]
1/25
3]
Sometimes there is a lack of oxygen in our muscle cells hence the pyruate !reaks do"n
to form lactic acid "hich !uilds up in our muscles during sudden actiity and causescramps#
]
$laster of $aris is calcium sulphate hemihydrates# %t is o!tained !y heating gypsum
&ses'( )1* $lastering fractured !ones
)2* statues+ toys etc#
!]
%t is a dou!le displacement and precipitation reaction#
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"]
$lant kept in continuous light "ill lie longer+ !ecause it "ill !e a!le to produce oxygen
re,uired for its respiration !y the process of photosynthesis#
#]
-aximum current through resistor . 0.
hus the maximum current through resistors and 3 each
$]
he follo"ing eents occur during photosynthesis'
)i* .!sorption of light energy !y chlorophyll#
)ii* 3onersion of light energy to chemical energy and splitting of "ater molecules into
hydrogen and oxygen#
)iii* 4eduction of car!on dioxide to car!ohydrates
%]
he steps inoled in reflex action are'
)i* 4eceptors receie the stimulus
)ii* ere cells takes the stimulus+ conerts it into electrical signal and passes it throughsensory nere#
)iii* he impulse passes through spinal cord "here it gets transmitted through relayneuron and it passes further through motor neuron to the effector organ+ i#e# muscles#
1&]
11]
)a* Siler chloride on exposure to sunlight may decompose as per the follo"ing reaction#
herefore+ it is stored in dark coloured !ottles#
)!* 3alcium oxide reacts igorously "ith "ater to produce slaked lime )calcium
hydroxide* releasing a large amount of heat
12]
)a*
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)!*
13]
%n a!sence of litmus paper a reagent phenolphthalein can !e used# he solution "hichgets pink colour "ith phenolphthalein is !ase other is acid#
1]
. stimulus receied !y a neuron traels through it in the form of an electrochemical
distur!ance# 6hen an electrical signal reaches the axonal end of one neuron+ it releaseschemical su!stance called neurotransmitter that cross the synapse and moe to"ards the
dendritic end of next neuron generating another electrical singal# . narro" fluid filledspace+ called synaptic cleft occurs !et"een the t"o neurons# .n impulse traels through
the neurons only in one direction !ecause the neurotransmitter releases only on one sideof the synapse#
1!]
)a*
)!*
1"]
he arious plant hormones are auxin+ gi!!erellin+ cytokinin and a!scisic acid# 7unctions
of plant hormones'
)a* .uxin ( %t helps the cells to gro" longer at shoot tips#
)!* Gi!!erellin Gro"th of stem#
)c* 3ytokinin $romotes cell diision#
)d* .!scisic acid %nhi!its gro"th in plants
1#]
he thum! in right hand rule indicates the direction of current in the straight conductorheld !y curled fingers+ "hereas the 7leming8s left(hand rule gies the direction of force
experienced !y current carrying conductor placed in an external magnetic field#
1$]
9ints iomass' $lant and animal "astes# Gie description of !iogas plant "ith the
follo"ing diagram#
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1%]
)a*. current carrying conductor produces a magnetic field around it# 6hen it interacts"ith magnetic field it experiences a force# Direction of the force depends upon
direction of current and that of magnetic field#
7leming8s left hand rule# State the rule#
)!*he deflection "ill increase# .s the magnetic field produced around the conductor isproportional to the current flo"ing through the "ire#
:4
a* he earth "ire+ "hich has insulation of green colour+ is
usually connected to a metal plate deep in the earth near the house#
his is used as a safety measure+ especially for those appliances that
hae a metallic !ody+ for example+ electric press+ toaster+ ta!le fan+
refrigerator+ etc# he metallic !ody is connected to the earth "ire+ "hich
proides a lo"(resistance conducting path for the current# hus+ it
ensures that any leakage of current to the metallic !ody of the appliance
keeps its potential to that of the earth+ and the user may not get a seere
electric shock#
!* due to electromagnetic induction+ there "ould !e change in the magnetic field around
the coil . and so "ill !e around # So current "ill !e induced in coil #
2&]
)a* aking po"der )a93:0*+ salt . is commonly used in !akery products# :n heating it
forms sodium car!onate )a23:0*+ and 3:2gas+ 3 is eoled# 6hen 3:2gas is passed
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through lime "ater it forms calcium car!onate )3a3:0*+ "hich is slightly solu!le in "ater
making it milky#
. a93:0
a23:0
3 3:2gas
)!* leaching po"der is used
)i* for !leaching "ood pulp in paper factories#
)ii* for disinfecting drinking "ater to make it free of germs#
:4
)a* )i* Sulphuric acid ; Zinc Zinc sulphate ; 9ydrogen 92S:
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)!* 7orms a protectie layer of aluminium oxide
)c* Strong oxidi=ing agent oxides 92to 92:
)d* >asy to reduce metallic oxide to metal
)e* Good conductor of heat+ on corrosie#
22]
)a*
)!*
)c*
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)!* he digestion of car!ohydrates )starch* starts in the mouth# he salia has saliaryamylase or ptyalin en=yme "hich acts on the starch and conerts it into maltose sugar#
he partially digested food reaches the stomach "here the food gets mixed "ith gastric@uice secreted !y gastric glands# he gastric @uice contains large ,uantities of mucus+ 93l
and pepsin# he en=yme pepsin acts on proteins and coerts them into peptones andproteoses# he gastric lipase emulsifies fats#
ile @uice secreted from lier lipids into small droplets#
$ancreas secretes pancreatic @uice "hich contains the pancreatic amylase+ trypsin andlipase# $ancreatic amylase digests the leftoer starches into maltose# rypsin conertspeptones and proteoses into small peptides# Aipase acts on small droplets and conerts
them into triglycerides#
he food reaches the small intestine "here complete digestion of food takes place in the
presence of an en=yme called succus entericus# he maltose conerts into glucose+
peptide emulsifies into amino acids and the triglycerides emulsifies into fatty acids andglycerol# B
:4
)a* %n four cham!ered heart+ left half is completely separated from right half !y
septa#his preents oxygenated and deoxygenated !lood from mixing# his allo"s ahighly efficient supply of oxygenated !lood to all parts of the !ody# his is useful inanimals that hae energy needs+ such as !irds and mammals#
)!*
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2]
)d* in set up . and )a* in set up
2!]
Sodium !icar!onate C 6ater C 7ruit @uice
2"]
%
2#]
.+ 3+ D+
2$]
.
2%]
.n antacid
3&]
he final solution !ecomes light green
31]
-etal .l2)S:
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3"]
epidermal cells+ stomata+ guard cells each "ith one nucleus and many chloroplasts
3#]
% 3ytoplasm %% nucleus
%%% stoma %? chloroplast
3$]
3%]
.!sor!s 3:2released !y germinating seeds
&]
hin layer of fleshy leaf of onion
1]
he glo" of the !ul!s 2and 0"ill remain the same
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