Sa i Class x Science 1

8/11/2019 Sa i Class x Science 1

1/26

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'.


2/26

/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


3/26

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


4/26

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


5/26

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


6/26

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


7/26

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


8/26

?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:


9/26

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


10/26

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


11/26

>.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'


12/26

. 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


13/26

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


14/26

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:


15/26

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


16/26

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


17/26

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


18/26

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#


19/26

"]

$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*


20/26

)!*

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#


21/26

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


22/26

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:


23/26

)!* 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*


24/26

)!* 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#

)!*


25/26

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:


26/26

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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Sa i Class x Science 1

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