~oll No. 1[7 -,,~ -.., .

__ ,__ Candidates must write th e Code on

the title •page of the answ er-bo ok.

• Pleas e check that th. .

. is quest ion pape r conta ins 14 print ed page s.
• Code numb er given h . ,.,·"
b .tt on t e right hand side of the quest ion pape r shou •
th ld
• e wri en on e title page of the answ er-bo ok by the candi date.
• Pleas e check that th• . /
is quest ion pape r conta ins 39 quest ions.
• Pleas e write down th s ·• 1 '
• e ena N upibe r <;>f' the quest
·
ion before attem pting it.
• 15 minu tes time h b
_.., - as een al19tti ed to read this quest ion pape r.
//
• f.

/. l
I j
i• . •"" -.. . "' SC~ENbE·
Time allowed~: 3 hour s
t
j j Maxi mum Mark s : 80
General Instr uctio ns : .
. '1.. • r i . .
\ •/ •1t •
\ ✓·
(i) This que\t ion pape~ co'nsii'ts of 39 {uest ions in 5 sections.
\ \ \;;/ .
(ii) All ques tion~ are comp ulsor y. However, an .inter nal choic e
·~ .. . is prov ided in
some quest ions. A stude nt is expected to attem pt only one of these
"\ .., . quest ions.
' • . ·i

(iii) Sect ion A consi sts of 20 Objective type quest ions carry ing 1 mark each.
. ~ • \ .
\ '
•

(iv) Sect ion B consi sts of6 Very Shor t quest ions carry ing 2 mark
. , .
s each. Answ ers
to these . q~est ions shou ld be jn the range of 30 to 50 words.
' •
'
(v) Sect ion C consi sts ·of 7 Shor~ Answ er type quest ions carry ing '

3 mark s each.
Answ ers to these quest ions sho'-!ld ~e in the range of 50 to 80 word
. s .

(vi) Sect ion D consi sts of 3 Long Answ er type quest ions carry ing
5 mark s each.
Answ er to these quest ions shou ld be in the range of 80 to 120 word
,:'
s.
(vii) Sect ion E consi sts of 3 Sourc e-bas ed I Case-based units of
asses smen t of 4
mark s each with sub-p arts.
 SECTIO N-A
(Select and write one most appropri ate option out of the four options
given for each of the q~estion s 1 - 20)

1. Naman heated crystals of ferrous sulphate in a dry boiling tube, smelt

a
the· fumes of pungent gas and saw c~ange in colour of ferrous sulphate·
crystals. Why does the green colour of ferrous sulphate crystals change
to reddish brown?
1
//-~

~__,◄•---- I,;/ngs • ,,,,.,

)
~-.-----r,1Boiling Jube
I .
CrP,la1s of ferro~s ' \
\"-1111--------./;....·

r. su'rate / \
14---,- Burer : //"'

.I .·•
I •
iL
•-
, : ·-7
·••·•-,
/
(i) Due to formation of ferric /xid~-/ 1
·i. '
j
(ii) .Due to formatioJ ·of sulpliur dioxide. l
. . , , .I
(iii) Due to formation of,_s~lphur .trioxide. !
(iv) Due to 'decomposition of~us sulphate. }
\ ~ . ;
(a) (i), (ii} ana (iii) . \. (b), (ii) and (iii)
,_ :
(c) (i) and (iv) \ ~ ., ~- (d) Only'' (ii)
, ' _./
2. Rajul listed the otganism in col~mn •I and its mod_e of nutrition in
column ·II. One of them is writt:n incorrectl y by her. Which one of
\ ✓. •
.these is not correct? 1
Column· I Column II
(a) Blue gre~n algae . Saprophy tic
(b) Leech. Parasitic
(c) Mould Holozoic
(d) Frog . Heterotro phic

3. The given figure shows the direction of current as well as direction of

the magnetic field lines· of the magnetic field. Identify the rule shown
in the figure. 1
4
 Current

(a) Max wel l's left han d rule .

(b) Rig ht han d thum b rule
(c) Flem ing' s righ t han d rule (d) Flem ing' s left han d rule
4. Wh at w1ll be the a 1 f . . / . .
follo win g diag ram ? ng e o 1nc 1de n~ and ang le of refl ecti on 1n the
1

(a) 35°, 35°

(b) 90°, 90°
(c) 55°, 55°
(d) 35°, 55°
5. Mah i add ed mag nes ium sulp hate , zinc sulp
hate , iron sulp hate and
silv er nitr ate solu tion s in~ ur test tube s A,
B, C and D resp ecti vely .
The n she· add ed cop per piec es to each test tube
. In whi ch of the test
tube s, the blue colo ur will app ear?
·1

---------
---------
MgS 04 ---------
---------
FeS 04 AgN 0 3 ---------
solut ion solution solution

(A) Cu pieces (B) (C) Cu pieces (D)

(a)· In test tube A (b) In test tube B
(c) In test tube C (d) In test tube D
6. Wh ich of the follo win g stat eme nt is not corr
ect? 1
(a) Elec tric curr ent prod uces a mag neti c effe
ct.
(b) Elec trom agn ets invo lve the mag neti c effe
ct of elec tric curr ent.
(c) Mag neti c field is limi ted to and mor e at
the cen ter of bar mag net.
(d) Elec tric curr ent carr ying wire beh aves like
a mag net.
5
P.T. O.
7. A component used to regulate current witho~t changing the voltage
. 1
source 1s
(b) voltmete r
(a) ammete r
(d) battery
(c) variable resistance
s. Look at the picture carefully and select the correctly labelled glands
given in the table. 1

- - - (III)
....,__-,,..; t--(IV)

t .. I

-·
(I) /(ID 1 (III) (IV)

Testis
(a) Pituitary gland 1
~
\Thyr_?jd Adrenal
' /yro1.d
Tii Pancrea s Testis
(b) Pituitary gland"'
'
(c) Pituitary gland Thyroid Pancrea s Ovary
,

(d) Pituitary gland . 'Parathy roid Adrenal Testis

9. While cooking, if you obs·erve the bottom of the cooking vessel getting
blackened, it means 1
(i) a blue flame is produced which makes the bottom black.
(ii) air holes are blocked.
(iii) the fuel is burning completely.
(iv) the fu.el is getting wasted.
(a) (i), (ii) and (iii) (b) (ii), (iii) and (iv)
(c) (ii) and (iv) (d) (i) and (ii)

10. The speed of light in a transpar ent medium is 0.6 times that of its
speed in vacuum. What is the refractive index of the medium? 1

(a) 1.67 (b) 1.54 (c) 1.82 (d) 1.88

6
il• Which of the follo .
wing groups contain only biodegradable items? l
(a) Newspaper pest" .
' icides, clothes (b) Newspaper,leather, used clothes
(c) Detergent, books ·
' 1eather (d) Books, detergent, pesticides
12• Which of the follow·
figure that hel ing observation/s can be concluded from the given
P us to det •
place? ermine t h at a chemical reaction has tak en
1

lt---+il =""~ ical flask

ilute sulphuric acid

nc granules -

(a) Evolution of gas (b) Change in colour

(c) Chang~ in temperature (d) Formation of precipitate

13. The diagram shows the cross section of a leaf. 1

vo)
:!~~~----=-- ~~~~""'"'
1-4---(II)

1) 0 ----=--·
~ ~ O} (IV)

. cells/tissues normally contain stomata?

Which of the fo11owing
(b) (II) and (III)
(a) (I) and (11)
(d) (III) and (IV)

7
14• In the experim t . the dependence of current (I) and potential
. en on studying
difference (V), three students plotted the following graph between (V)
and (I) as per their respective ·observations. 1

tI tI tI
. v~ y-. y-.
(I) (II) UII)

The observation likely to be correct are those of

(a) Student I only (b) ,Student II only
(c) Student III only (d) All the three students

15. Transmission of traits from one generation to next through genes is

known as 1
(a) heredity (r) variations
(c) genetics (a) replication

16. The number of bonds in t e simplest hydrocarbon is 1

(a) 1 (b) 2
(c) 3 (d) 4

Q. no 17 to 20 are Assertion - Reasoning based questions.

These consist of two statements - Assertion (A) and Reason (R).
Answer these questions selecting the appropriate option given below:
(a) Both A and Rare true and R is the correct explanation of A.
(b) Both A and Rare true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

17. Assertion (A): When a current carrying straight conductor is placed

perpendicular to the direction of a uniform magnetic field, it experiences
a mechanical force.
Reason (R): The direction of the mechanical force is given by Fleming's
left hand rule. 1
8
tB· Assertion (A): An. object is situated at a distance of 10 cm from the
optical centre of a convex lens of focal length 20 ~m. The image forIIled
on the screen is found t .
o be an erect and enlarged image.
Reason (R): Convex 1 . 1
ens 1s a converging lens.

19• Assertion (A): Some metals are said to be lustrous.

Reason (R): Metals in their pure state have a shining surface. 1
. ~

20• Assertion (A)·• Maximum

• .
energy 1s,, ahyays\ available at the lowes t
_,,,/ \ •
level in the pyramid. ;· )
I • .,/

ReaSon (R): •Energy flows only u{ one dir:ction from highe~ level to
I ;
lower level. t
f .. ,l
i •
1
~- • . 'f
r .J
l y
-..4' • ._.,.,......., .... ~ ~"\- ... ·.•,.,,:,,.r;-' ,. r.._.
~. dJ

✓<1 " ~SECTION/- B

Q. no. 21 to ~ are very sh~h
f ~,
anler ;~ues~ions.'
1 • .. .
I ·'t
l_·
J •
,
I >'

21. Why is PNA copying~ ad essenJal'part· of· the ptocess of reproduction? 2

•·. ;, f .,. .f '
i .. • ' • ~

22, Write t~e m~1ecufur\ormula

. ', /..
i~tlJ.~l and· dra~: i~ electron dot structure. 2
./ '
23. (a) Nam\. a simple ~u1{J~{i ~ orga~ism :which reproduces by
\;, , .,., • , \_V
1, V,

\ . \ ,: . .-$' • ' !

fragmentatio n. . \.,~ • • .:: . . 1 •

\,
(b) Do you think that human ~eings can also reproduce by fragmentation
. ·\ • ' .

• \ I . \
~ . ~

method? Ex~_Iain. '·\. .\:· 2

. '\._ • • ·, • ,; v·', . .

24. How is the magnetic field produced by bar magnet differe_nt from the
,> • ~
a
magnetic field produced by ar solenoid? 2
t .,..,r
. . ,.. ,,,.,,.-· OR

State and define the rule by~hich.you can find the direction of magnetic
field in the given diagram.
Force on the
conductor

Current
9
 25. In an asexually producing organism, a trait ~A' exists in. 10% of a
population ~nd trait 'B' exists in 75% of the same population. Which
of the two traits is likely to arisen earlier? Give reason to justify your
·choice. 2

26. (a) How do H+ ions exist in ·nature?

(b) State the relation between hydrogen ion concentration of an aqueous
. d ·t H Which has. a higher pH value, 1 M HCl or 1
so1u t 10n an 1 s p . .
2
M NaOH solution?

..
(a) A solution has pH equal to
(i) increase the pH?
/
1
....,r/~· :r-~\ .
.\

(ii) decrease the pH?-...., • -• .: •• _:,>

,.,,. ! . / •
(b) Whil~paring cW,:e/your :~~ r ad~ll(} bafing soda in place of
baking powder. How will it ~ectJ the taste ~f cake and why? .
\. • . j-' 1·.-.-: ~-;~;., ( . _j·1
fl . . ' '.
. y

i :,-.-,
_;;;.~-

. ii .. ' • ..

<;·
t,. r • .,~- ,.:;.. t~ • ~

·
\ · • _ -.· .)\
t '.
SEo/PQN - C j • £, • ,. • •:J
!
I ~
Q.no. 27 to ai ~ Short ans~;-~ions. f j •
· 27. (a) Rahul\ ~ery ca~~~:~~ng off die wJste generated at home
as he kn~~s improper iaste disposal i; not gbod to the environment.
. \\ . ' J f
Expl~in. \. •••_.-· • .?\ • .r~/- ~1 1

\ •. \ ( • I
(b) What is the role of decomp'osers? / • 3
_.. . , \ v/

28. Sanskriti heated b~~

colour ~wder of copper (II) nitrate in a b~iling
tube. Black copper oxit,.Toxygen and a ~rown gas X is formed. 3
I

(a) Identify the brown gas X and the type of reaction·.

(b) Write balanced chemical equation.
(c) What will happen if gas X is dissolved in water? Write the pH
range of aqueous solution of gas X.

29. Reetu took a thoroughly watered . potted .plant and covered it with a
transparent plastic sheath and kept it in the su_nlight for one hour.
After one hour she observed wajer droplets in the inner surface of
plastic sheath.

RSPUEAD/Mock Paper 10
 6 6 6
6 6

From where and wh h

of the sheath ? Stat: ave the water dro • come in the inner surfac e
. th. a nd define ~~~ enome on involved in it. How
is is proces s helpfu l to the gro7 g Plants'? . 3

OR
th th: help of a flow chart /how the pathw ay of break down of
Wi
glucos e m a cell to·prov ide eneJ
(a) in the presen ce of oxygen
(b) in the absenc e of oxygen
(c) lack of oxygen

30. Two resisto rs 3 Q and un~ow n resi tor are connec ted in a series across
a 12 V batter y. If the volta g~op across the unkno wn resisto r is 6 V,
3
find
(a) potent ial across 3 n resista nce
(b) the curren t thro~g h unkno wn resisto r 'R'

(c) equiva lent resista nce of the circuit.

3
31. (a) Write the molec ular formul a of an
(i) alkane
(ii) alkene and alkyne
contai ning four carbon atoms.
Write the formu la of the following compounds.
(b)
(ii) Metha nal
(i) Metha nol
(iii) Metha noic acid

11
 l?
.32. (a) How does the creati on of variat ion in a specie s promo te surv·1va.

JP> 'It is a possib le that a trait ~s i~eri ted but may not be· expressed'.
Give a suitab le exam ple to Justif y the above statem ent. 3

tic
33. (a) Identi fy from the given region s A or B which has a strong er magne
field. Give a reaso n to suppo rt your answe r.
• • * • . •
-;: =.:;.,... •/~ .; ....... ; o _, t • o .' I

of
(b) Expla in with the help of a la:bell ed diagr am the distri butio n
3
magn etic field due to curren t throu gh a circul ar loop.

SECT ION- D

Q.no. 34 to 36 are Long answ er quest ions.

34. . (a) A beam of white light falling on a glass prism gets split
up into
('

seven colour ed marke d 1 to 7 as shown in the diagr am.

1
2
3
4
5
6
7

Identi fy the positi on which corres ponds to

(i) colour of sky (ii) colour of gold metal
(iii) colour. of brinja l (iv) colour of dange r signa l

12 ·
 · 1ig• ht
ft) A glass prism i s a bl e to produce a spect rum when white
passe s throu gh it b t a g1ass slab does not produce ariy spect rum.
E . . u 5
xp1a1n why 1s it so?

OR
. .
(a) Why is norm al e able to focus on an object place d w1th1n
£ ye not
15 cm rom the eye?
(b) Draw a diagr am 0 f h.
uman eye and label only the following parts .
(A) - Cont~ols the size of the pup i.0 )
(B) - Provides finer adjustme t of focal length
(C) - Regu lates and control the amou nt of light enter
ing the eye

(D) - Acts· as a scree~ to olJtain the image of an object

35. (a) Why does menstruation occL?

(b) How will you differentiate etween gamete and zygote?

ods? 5
(c) Wha t could be the reasons or adopting contraceptive meth

(a) Wha t is pube rty?

A, B, C,
(b) Look at the given diagr . dentify the parts labelled as
D and E. Write their functions also.

36. (a) Why is carbo n not used for maki ng alum inium
fr~m alum inium

oxide?
be used
(b) Thou gh alum inium combines with oxygen but still it can
for maki ng kitch en utensils. Explain.
in the
(c) A meta l M is found in natur e as its sulphide MS. It is used
galva nisat ion of iron articles. Identify meta l M and its ore MS.
13
 '

con ver t the car bon ate ore of thi s me tal M into free
(d) How will you
metal? Ex pla in wit h equations. 5
OR
ns
ed to the following aqu eou s solutio
Fo ur metals A, B, C an d D are add
de are tab ula ted below:
one by one. Th e observations ma
Co pp er (II ) Zinc Silver
Metal Iro n (II )
su lph ate As ulp ha te nitrate
su lph ate
~ ............
.......... ••••••••••••••••······
A No rea cti on Re dd 'li
brown deposit

Gr ey dep osi t ...................... No rea cti on ......................

B
No rea cti on Wh ite shining
C No rea cti on
dep osi t
No -reaction
D No reaction No Jeaction

s:
bas ed on the above ob ser vat ion
An sw er the following questions
eta l and why?
(a) Which 'is the mo st active
.)s added to a sol uti on of cop per (II)
~

(b) Wh at would be ?bserv ~ i(B

\;/ .
sul ph ate and why?
y.
'
D in ord er of inc rea sin g rea cti vit
I (c) Ar ran ge the me tal s A, B, C and
ate
Co nta ine r pf wh ic~ me tal can be use d to sto re bo th zin c sul ph
(d)
I solution and silver nit rat e soluti
on?
be eas ily sto red in a con tai ner
I
I
(e) Wh ich of the abo ve sol uti ons
made up of any of the se me tal s?
can

I
I Q.no. 37 to 39 are cas e-b ase d/d
SE CT IO N- E

ata -ba sed qu est ion s wi th 2 to

3 sho rt

ern al cho ice · is pr ov ide d in on e of th ese sub -pa rts .

I sub-parts. Int
I hor izo nta lly an d let it be lik e
tha t
Mo nik a kep t the pot ted plan_t
37. (a)
ure. Af ter tha t she ob ser ved the
for 5-6 days as shown in the fig
vements. Ex pla in.
root and shoot show different mo

14
 (b) How is this ty e Of
P move ment differ ent from the move ment in
touch -me-n ot plant? 4

OR
by
(b) What are the differ ent tYPes Of directional movements shown
plant s in respo nse to various stiml li?

38. The huma n eye is one of the mol si~fi cant sense organs as it enables
I
us to see the beaut iful colourful orldiaround us. The huma n eye is like
s
a came ra. Light enter s the eye throlil.gh the cornea and lens system
ur,
forms an· image on retina . If cornea, pupil, eye lens, aqueous humo
t in
vitreo us humo ur, retina or..-6'tic nerve is damaged, it will resul
visua l impai rmen t. \ • . 4

d
(a) Why does it take some time to see the objects in a dimly lighte
room when we enter the room from brigh t sunlight outside?

(b) A perso n is advised to wear spectacles with concave lenses. What

type of defect of vision is he suffering from?

(c) What is presbyopia? What causes presbyopia? How is presbyopia

corrected?
OR
.
(c) Shrut i needs a lens of power -3.5 D for correction of her vision
What kind of defect in vision is she suffering from and wha~ is the
focal lengt h of ~he corrective lens?

15
,er
39. A small amount of hydrochloric acid produced in the stomach 1s useful
as it can kill the ~armful bacteria that may enter into the stomach along
with the food that we eat. Akshaya studied the conduction of electricity
through the solution of hydrochloric acid in water and observed that
the bulb starts glowing. He repeated the same experiment with dilute
HNO3 and H 2S04 . Every time the bulb started glowing. 4

• 6 volt ➔
Battery

..,_-;-- Beaker

._.._iL-.1-Nail
4-+----,-- Dilute acid solution

...,___,__ _ Rubber cork

(a) What does he conclude frofu the above observation?

~
(b) What is the colour oft~1 7 solution extracted from the lichen

plant? How will you use these solutions to test whether the given
solution is acidic or basic?
(c) Name two natural 'indicators. Why does a stain of curry on a white
cloth become reddish brown when soap is scrubbed on it and turns
yellow again when the cloth is washed with plenty of water?
OR

(c) What is acid rain and what is its pH? How does it affect the aquatic
life?

16