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CBSE Sample Paper -03 (solved)

SUMMATIVE ASSESSMENT –II

SCIENCE (Theory)

Class – IX

Solution

1. Neutron does not have any charge. Its mass is 1.6! " 1#$% &g.

%. 'aemocoel is a sedocoel ith *lood. It is +ound in arthroods and mulluscs.

,. To +ind density o+ ater

-. Its valency is one *ecause it can gain one electron to *ecome sta*le li&e no*le gases.

!. The grou o+ organisms hich have ancient *ody designs and have not changed much arecalled /rimitive0 organisms. They are di++erent +rom the advanced organisms as advanced

organisms are grou o+ organisms hich have acuired their articular *ody designs recently.

6. 2ir resistance deends on sur+ace area hich is more in case o+ sheet o+ aer.

. a. N'-3 S4-

%$ *. 5g%3 'C4,$  c. a%3  N4,

$

(N'-)% S4- 5g('C4,)% a(N4,)%

7. 5ole is de+ined as counting unit and is eual to 6.#%% " 1#%, atoms.

a. num*er o+ moles o+ car*on8 num*er o+ atoms9 6.#%% " 1#%,

8 ,.#11 " 1#%, 9 6.#%% " 1#%,

8 : 8 #.! mol

*. num*er o+ moles o+ o"ygen gas8 given mass9 molar mass 8 ,%9 ,% 8 1 mole

;. The characteristics +eatures o+ Thallohyta are <

a. The lant *ody consists o+ individual thallus.*. The se" organs are single celled.

c. 2+ter +ertili=ation> no em*ryo is +ormed.

1#. /lants and animals are ut into di++erent categories on the +olloing *asis<

a. lants are stationary hile animals are not.

*. lants ma&e their on +ood hereas animals eat lants or animals as +ood.

c. lants gro inde+initely hereas animals sto groing a+ter attaining a certain si=e.

d. lant cells are surrounded *y a cell all hereas animals cells are not.

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e. lant cells contain chlorohyll hile animals cells do not.

11. ?aundice – Contaminated +ood and ater

@a*ies – Saliva o+ in+ected animal

2IAS – Through se"ual contact> *lood trans+usion> contaminated needle +rom mother to +oetus.

1%. (a) 2nti*iotics *loc& the *acterial rocess that *uild cell all in *acteria. 2s a result> the

groing *acteria *ecome una*le to ma&e cell all and die easily. Biruses do not have

*iochemical mechanisms o+ their on. They enter our cells and use our machinery +or their li+e

rocesses. There+ore ma&ing o+ anti viral medicine is di++icult than anti *acterial medicine.

(*) e can revent e"osure to air *orne micro*es *y roviding living conditions that are not

overcroded. E"osure to ater *orne micro*es can *e revented *y roviding sa+e drin&ing

ater. This can *e done *y treating the ater to &ill any micro*ial contamination. E"osure to

vector$*orne in+ections can *e revented *y roviding clean environments.

1,. /ressure is de+ined as thrust er unit area. Its SI unit is ascal.(/a)

m8 ,# &g

28 %#cm " 1! cm

8 ,## cm% 8 #.#,m%

g8 1# m9s%

/8mg9B 8 ,# " 1# 9 #.#, 8 1#- /a

1-. h 8 !# m

g8 1# m9s%

m8 7 " 1#% &g

t8 1 min 8 6# s

/oer8 9t 8 mgh 9t 8 7 " 1#% " 1# " !#9 6# 8 6.6 " 1#, 

1!. a. or& done *y gravity on a rolling *all.

*. hitting a stationary *all.

c. or& done *y a +riction o+ a rolling *all.

16. a. 'eat and light

*. /lants store energy in the +orm o+ 2T/Ds hich is used as +ood (directly or indirectly) or

+uel ( in the +orm o+ +ossil +uels).

c. 5ano is curious> inuisitive and courageous to as& uestions.

1. Fes> hen the o*ect is thron u> /.E ( in the +orm o+ mechanical energy) is non$=ero at the

highest oint o+ a roectile> even i+ &inetic is =ero due to =ero velocity.

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17. a. I+ a*sor*ent materials are a*sent there ill *e multile echoes due to hich sound cannot

*e heard clearly.

*. Sound aves are mechanical aves and cannot ass through vaccum.

1;. 5ass o+ silver in the ornament 8m gram

5ass o+ gold in the ornament 8m " 191## 8 #.#1 m gram

1#7 g o+ 2g contains 6.#%% " 1#%, atoms

5 gram o+ 2g Contains (6.#%% " 1#%,91#7)" m

m91#7 " 6.#%% " 1#%,

1; g o+ 2u contains 6.#%% " 1#%, atoms

m91## g o+ 2u contains (6.#%% " 1#%,91;) " m91## atoms

ratio o+ num*er o+ atoms o+ gold and silver 8 2u < 2g

8 (6.#%% " 1#%,91;) " m91## < (6.#%% " 1#%, " m)91#7

8 1#7 < 1;## 8 1<17%.-1

%#. Cause< @a*ies is a viral disease caused *y ra*ies virus> resent in the saliva o+ the in+ected

animal> articularly Aog.

Symtoms <

(a)  Severe 'eadache

(*)  /ain+ul Contraction o+ muscles o+ throat and chest.

(c)  'igh +ever and restlessness.

(d)  Ai++iculty in ta&ing even liuid +ood.

/revention<

(a)  ound caused a+ter the *ite should *e immediately ashed ith car*olic soa and clean

ater and antisetic medicine should *e alied. Then a doctor should *e soon consulted.

(*)  2ll dogs> cats and et dogs in the neigh*orhood should *e immunised.

(c)  The ra*ies animal shoing e"cessive salivation and see&ing isolation must *e &illed.

Control< 2 course o+ +ive anti$ra*ies vaccines are rescri*ed at an interval o+ #$,$$1-$,# days

o+ dog *ite. This is called /asteurDs treatment.

%1. or& is said to *e done hen a +orce alied on an o*ect moves it in its on direction.

E"amle o+ negative or&$ hen a *ody is sliding on a sur+ace> or& done *y +orce o+ +riction

is negative.

m 8 %### Gg

u8 17 Gm9hr

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v8 ;#Gm9hr

8 (17 " !917) m9s8 ! m9s

v8 (;# " !917)8 %! m9s

or& done to increase velocity>

8 : m(v%$u%)

819% " %### (%!% – !%)

8 1### (6%!$%!) 8 6 " 1#! ?

%%. (a) uoyant +orce 8 eight o+ liuid dislaced

8 (Bolume immersed ) " ( Aensity o+ liuid) " (acceleration due to gravity)

So> density o+ liuid and volume immersed a++ect *uoyant +orce.

uoyant +orce e"erted *y liuid does not deend uon its volume.

() 'ydrometer and lactometer are *ased on 2rchimedesD rincile. Su*marines are also

designed according to 2rchimedesD rincile.

%,. 4T2

%-. 4T2

%!. Het mass o+ 2gN4, used *e ".

5ass o+ NaN4, +ormed ill *e "9%

5ass o+ reactants8 mass o+ roducts

"3 ! 8 7.1 3 "9%

"9% 8 ,.1

" 8 6.1#g

mass o+ 2gN4, used 8 6.1# g

mass o+ NaN4, used 8 6.1#9% 8 ,.#! g

%6. emale cones are<

Harge and oody

5ale cones are<

Smaller and tender

%. (, " %) cm% /ressure is inversely area. I+ area is less > ressure is more.

%7. a

%;. c

,#. d

,1. *

,%. c

,,. a

,-. d

,!. a

,6. *