Series Z1XYW/2 SET-3

. Q.P. Code 31/2/3

Roll No. 1 31alelLle T-y8 fd
ONO Candidates must write the Q.P. Code
on the title page of the answer-book.

frdi

farRT atg 10.15 q feT TIT | 10.15 À 10.30 a 75 I

Please check that this question paper contains 27

printed pages.
Q.P. Code given on the right hand side of the question paper should be written
on the title page of the answer-book by the candidate.
Please check that this question paper contains 39 questions.
Please write down the serial number of the question in the answer-book before
attempting it.
1 5 minute time has been alloted to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the
students will read the question paper only and will not write any answer on the
answer-book during this period.

fasITA
SCIENCE

TTeriRa aH4: 3 auR 3f8paH 3c5 80

Time allowed 3 hours Maximum Marks : 80

31/2/3 1
P.T.O.
eneral Instructions:
ead the following instructions very carefuly and strictly follow them:
This question paper comprises 39 questions. All questions are compulsory.
i) This question paper is divided into five sections - A, B, C, D and E.
Section A -Questions No. 1 to 20 are multiple choice questions. Each question
carries 1 mark.
v) Section B-Questions No. 21 to 26 are very short answer type questions. Each
question carries 2 marks. Ansuwer to these questions should be in the range of
30 to 50 words.
) Section C- Questions No. 27 to 33 are short answer type questions. Bach
question carries 3 marks. Answer to these questions should in the range of
50 to 80 words.
vi) Section D - Questions No. 34 to 36 are long answer type questions. Each

question carries 5 marks. Ansuwer to these questions should be in the range of

80 to 120 words.
vii) Section E -Questions No. 37 to 39 are of 3 source-basedlcase-based units of
assessment carrying 4 marks each with sub-parts.
vii) There is no overall choice. However, an internal choice has been provided in
some sections. Only one of the alternatives has to be attempted in such
questions.
SECTION A
This section has 20 multiple choice questions ([Link]. 1 - 20). All questions are
compulsory. 20x1=20

1. The number of electrons in the outermost shell of the atom of a non-metal

can be:
(a) 1,2 or 3 (b) 3, 4 or 5

. (c 5, 6 or 7 (d) 5, 6 or 8

2 Select the correct option(s) in the following table

Option Natural Sources Acid present
(i) Tamarind Tartaric acid
i) Tomato Acetic acid
ii) Ant sting Oxalic acid
(iv) Nettle sting Methanoic acid
(a) ) only (b) ii) only
c i) and (iv) (d) (i), (ii) and (iv))
31/2/3 3
P.T.O.
Among the following, the metal with lowest density is:
(a) Lithium (b) Lead
(c) Magnesium (d) Aluminium

A Which of the following is an example of endothermic process ?

(a) Formation of slaked lime
(b) Decomposition of vegetable matter into compost
(c) Dissolution of ammonium chloride in water
(d) Digestion of food in our body ALcl3+

In order to balance the following chemical equation, the values of the

coefficients x and y respectively are
x Pb(NO32
)aHeat2 PbO +y NO2 +O2
(a) 2, 4 2 , 2,2 Gao
(c) 2,3 (d) 4,2

When zinc reacts with sodium hydroxide,the product formed is

(a) Sodium oxide Sodium zincate

(c) Zinc hydroxide (d) Zinc oxide 2n+ aon

NAn0y
Select the correct option from the following

Salt Parent acid Parent base Nature of salt |

(a) Sodium acetate CH3COOH NaOH Neutral
(b) Sodium carbonate HgCOs NaOH Basic

(c) Sodium chloride HC1 NaOH Acidic

(d) Sodium nitrate HNO3 NaOH Acidic

electric circuit diagram in which

For verifying Ohm's law, we design an
different circuit components. We find that
we show the arrangement of

with respect to the resistor, the:

voltmeter in series.
x (a) ammeter is connected in parallel and the
ammeter is connected in series and the voltmeter in parallel.
b)
ammeter and voltmeter are both connected in series.
ammeter and voltmeter are both connected in parallel.
y (d)
5 P.T.O
31/2/3
to the
An object is placed in front ofa convex mirror at infinity. According
and the sign
New Cartesian Sign Convention, the sign of the focal length
ofthe image distance in this case are respectively:
a) + {b)-+
(c) (d) +,+

When an * bearing sperm fertilises the egg, the resulting zygote has the
following combination of chromosomes:
44+XXK (b) 44 + XY
(a)
22+XX 22 +XY

Sphincter muscles are present at the exit of:

(a) Stomach and small intestine
(b) Stomach and anus
(c)
(c) Small intestine and large intestine

(d) Oesophagus and stomach

In the following diagram, identify the cells through which massive
12 amounts of gaseous exchange takes place for photosynthesis

II

III

IV

(a) I (b) IV
c) III (d) II
31/2/3 7 P.T.O.
outer muscles
of cramps in the
exercise, the
occurrence

1 3 During vigorous to:

of an athlete is due to the
conversion of pyruvate
(b) Ethanol
(a) Glucose
(d) Lactose
(c) Lactic acid

unisexual flowers are

14 Plants which bear

(a) Mustard and Papaya

(b) Hibiscus and Watermelon

Mustard and Hibiscus

(c)
(a) Watermelon and Papaya
to it as shown.
A positron enters a uniform magnetic field at right angles
15. be
The direction of force experienced by the positron will
Positron t

Magnetic field

(a) to the right

(b) to the left
into the page
(d) out of the page

current is increased to two times, the

In a resistive circuit if the
percentage change in the amount, of heat dissipated in the circúit would
be

(a) 400% (b) 300%

(d) 100% 2
c) 200%

31/2/3 9 P.T.O.
2T
as
ror Questions number 17 to 20, two statements are given- one labelled
Reason (R). Select the correct
Assertion (A) and the other labelled a s
and (d) a s given below.
answer to these questions from the codes (a), (b), (c)
Reason (R) is the
(a) Both Assertion (A) and Reason (R) are true and

correct explanation of the Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not
b)
(6)
correct explanation of the Assertion (A).

(c) Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.
(d)

other.
17 Assertion (A): Magnetic field lines do not intersect each
to
Reason (R): Magnetic field lines are imaginary lines, the tangent
which at any point gives the direction of the field at that

point.

X8. Assertion (A): Sodium oxide is an amphoteric oxide.

Reason (R): Metal oxides which react with both acids as well as bases
are known as amphoteric oxides.
)
Assertion (A): The angle through which a ray of light bends on passing
through a prism is called the angle of deviation.
Reason (R): The peculiar shape of a prism makes the emergent ray
bend at an angle to the direction of the incident ray.

2 0 Assertion (A): When a bacterium divides into two, and the resultant two
bacteria divide again, the four bacteria produced would be

6) almost similar.

Reason (R): DNA copying involves small inaccuracies in thee

reproduction process.

31/2/3 11 P.T.O.
SECTIONB

shown. If both wires

21 V-I graph for two conducting wires A and B are as

diameter, which of the two is made of a

are of the same length and same

to justify your answer. 2

material of high resistivity ? Give reasons

V
A

State the role of the following in the process of digestion 2

22%
(a) Bile juice and bile salts

b Pancreatic enzymes
14
(a) What is observed when aqueous solutions of potassium iodide and
lead nitrate are mixed together ? Name the type of reaction and
write the chemical equation for the reaction that occurs. 2
OR
(bWhen copper powder is heated in a watch glass, a black substance
is formed.

Why is this black substance formed ? Name it.

(i) How can this black substance be reversed to its original

form? 2

31/2/3 13 P.T.O.
24 Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt)
all tal plants in F1 generation.
and obtained

is the gene combination present in the plants of F1

aa)2What
generation?

Give reason why only tall plants are observed in Fi progeny.

What will be the ratio of the plants obtained in the F2 generation

when F1 plants are self-pollinated? 2

When and where does a rainbow appear in the sky ? Draw a

(a)
26
labelled ray diagram to show its formation.

OR

blue ? 2
(b) What is scattering of light ? Why does the clear sky appear

essential function for the

"Ozone, although a deadly poison, performs an

earth and its inhabitants." Explain. 2

SECTION C

27/Aa) Define oxidation.

in the following reactions and balance

Identify the oxidising agent
thechemical equations

Pbg04PbgO4 HCI 3PbClh+Cl2 +H20

3
i) MnOg 4Al ZMn +2Al;03
31/2/3 15 P.T.O
3MO+ A 3MA 2
AL,O2
loses its
moist gas 'A' in the air and slowly
reacts with
a
Copper the substance
28 It turns green. Identify A' and
brown surface.
shiny the surface of copper.
on
coating formed
of the green chemical
? Write the
(bY How is copper
the
obtained from

reaction involved
its sulphide
in its
ore

extraction.
2
3

equations for

What is meant by excretion?

29. (a)i) with the urinary
that connects the kidneys
Name the organ
(ij function.
bladder. State its reabsorbed
amount of water
which the
iii) List two factors on
3
depends.

OR
name the following:
In the human respiratory system,
(b) (i) fine hairs and
mucus

Part where air is

filtered by
()
lining abdominal
chest cavity from
ID
(II) Part which separates
cavity takes
structures where exchange of gases
(LII) Balloon like
(III)
place trachea to
air passages
that lead from
(IV) The two large
the lungs
which make it an
characteristics of lungs
(i)
i) List any two 3
efficient respiratory surface.

3 cm on a
of an object of height
the image 12 cm. If the
A student has focussed mirror of focal length
30 concave
of
white screen using a
the mirror is
18 cm, find the values
from
distance of the object
the following
the mirror x 36
image from
Distance of the 3
Height of the image

OR
P.T.O
17
31/2/3 Cs
of a lens is 10 cm. Write
a lens. The focal length
-

Define power of
(b)
If a n object is placed at
a

the natureof the lens and find its power.

from the optical centre of this lens,
according to
distance of 20 cm

be the sign of
the New Cartesian Sign Convention, what will
?
3
magnification in this
case

food
harmful chemicals enter our bodies through the
3 1 Explain how some
to be
is the concentration of these harmful chemicals found
chain. Why
3
maximum in human beings ?

List two factors on which the magnitude of magnetic field produced

32.
32.

by a current carrying straight conductor depends.

field in
State the rule which determines the direction of magnetic

the above case.

produced in this 3
Draw the pattern of magnetic field lines
case.

gland which secretes it in human

33
33 Name the hormone released and the
How does the body respond to enable it to
beings during scary situations.
3
deal with the situation?
SECTION D

a List three points of difference between nervous and

hormonal mechanisms for control and coordination in

animals.

) How are auxins related with the bending of plant shoot

towards unidirectional light ? Explain. 5

OR

31/2/3 19 P.T.O.
which is likely to suffer from
Name the disorder
a person
b) (i)
due to the following

Over-secretion of growth hormone

(I)
(II) Deficiency of oestrogen in females

(III) Less secretion of thyroxine

the gland that secretes each of the hormones
Also name

mentioned above.

timing and amount of hormone released

(ii) How is the
5
regulated? Explain with the help of an example.

An acid X and an alcohol Y react with each other in the presence

)
of an acid catalyst to form a sweet smelling substance Z. Identify
reaction
chemical equation for the
X, Y and Z'. Write the
treatment with sodium
involved and name it. The substance Z on

alcohol Y and sodium ethanoate.

hydroxide produces back the
reaction involved and name it,
Write the chemical equation for the
5
giving justification for the
name.

OR

Draw its electron

Name the simplest saturated hydrocarbon.
exist in this compound?
dot structure. Which type of bonds
carbon compound used as a
Name any two mixtures of the
mentioned compound is
fuel in life, of which the above
daily
an important component.

of carbon compounds can this

i In which homologous series

compound be placed ? Write the general formula of thhe

series.
it ? 5
ivWhich type offlame is produced burning
on

21 P.T.O.
a ray diagram tor
showing the convergence of parallel
a
(a Draw
36. mirror and mark the positions of pole
beam of light by
a concave

in it.
and the centre of curvature
concave
4 cm in size is placed at 25 cm in front of a
(b)An object
from the mirror
mirror of focal length 15 cm. At what distance
? Find
should a screen be placed in order to obtain a sharp image
the nature and size of the image.

5
List any two uses of a concave mirror.

SECTION E

source-basedI case-based questions. Read the case

The following questions are
that follow.
carefully and answer the questions
in the laboratory divided the
37. The teacher while conducting practicals
various solutions to find out
students into three groups and gave them
neutral solutions.
their pH and classify them into acidic, basic and

Lemon juice, vinegar, colourless aerated drink

Group A -

Group B -

Tomato juice, coffee, ginger juice

Group C- Sodium hydroxide, sodium chloride, lime water

which group is/are likely to have pH

(a)Forthe solutions provided,
value (i) less than 7, and (ii) greaterthan 7? 1

of a solution 1
L i s t two ways of determining pH
such as lemon juice are effective
Explain, why the sour substances
in cleaning the tarnished copper
vessels. 2

OR
31/2/3 23 P.T.O
(c) "pH has great importance in our
daily life." Justify this statement
by giving two examples.
2

38. All the reproductive methods of living

organisms are broadly categorized
into two types: 1. Asexual
reproduction, and 2. Sexual reproduction.
Asexual reproduction involves the
participation of a single parent
without the formation of gametes,
fertilisation and transfer of genetic
material. This method is a common means of
rapidly increasing
offsprings under favourable conditions.

(a Name the type of fission that occurs in Leishmania and

Plasmodium.

(b) Write one advantage of sexual mode of reproduction over asexual

reproduction. 1

(c) Give reasons why:

) Colonies of yeast fail to multiply in water but multiply in
Sugar solution.

(ii) Rhizopus individuals do not grow on a dry slice of bread. 2

OR

(c) Name the filamentous structures a student could identify when he

collected water from a pond that appeared dark green. How do

these organisms multiply ? Explain. 2

25 P.T.O.
2/3
identical
diagram in which nine
39. Consider the following electrical circuit
of the
each connected as shown. If the reading
resistors of 3 2 are

1 ampere, the following questions

ammeter Aj is answer

ww%A2
3 2
30 32
ww
www
32 3
ww ww*
www
32

? Give
What is the relationship between the readings of A1 and Ag
1
reasons for your answer.

What is the relationship between the readings of A2 and Ag ? 1

(c) Determine the reading of the voltmeter V1.. 2

OR

(c) Find the total resistance of the circuit. 2

27
3
1/2/3
36