086/X/SA2/22/A1
Class - X
·¤ÿææ - X
SCIENCE
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Time : 3 to 3½ hours
â×Ø Ñ 3 âð 3½ ƒæ´ÅðU
Maximum Marks : 80
¥çÏ·¤Ì× ¥´·¤ Ñ 80
Total No. of Pages : 16
·é¤Ü ÂëcÆUæð´ ·¤è ⴁØæ Ñ 16
General Instructions :
1.
The question paper comprises of two sections, A and B, you are to attempt both the sections.
2.
All questions are compulsory.
3.
There is no overall choice. However, internal choice has been provided in all the three questions
of five mark category. Only one option in such question is to be attempted.
4.
All questions of section A and all questions of section B are to be attempted separately.
5.
Question numbers 1 to 4 in section A are one mark questions. These are to be answered in
one word or one sentence.
6.
Question numbers 5 to 13 are two mark questions, to be answered in about 30 words.
7.
Question numbers 14 to 22 are three mark questions, to be answered in about 50 words.
8.
Question numbers 23 to 25 are five mark questions, to be answered in about 70 words.
9.
Question numbers 26 to 41 in section B are multiple choice questions based on practical
skills. Each question is a one mark question. You are to choose one most appropriate response
out of the four provided to you.
10. An additional 15 minutes time has been allotted to read this question paper only. Candidates
will not write any answer on the answer sheet during this time interval.
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SECTION - A
Name the part of the eye
(a) that controls the amount of light entering into the eye.
(b) that has real, inverted image of the object formed on it.
1.
1
2.
Draw the structure of pentanal (C4H9CHO)
1
3.
Which of the following belong to the first trophic level ?
Grasshopper, Rose plant, Neem plant, Cockroach, Vulture.
1
4.
How is depletion of ozone layer in the atmosphere responsible for causing skin
cancer ?
1
5.
A person can read the number plate of a distant bus clearly but he finds difficulty in
reading a book. What type of defect of vision he is suffering from ? Name the type of
lens he needs to correct this defect. Write the causes of this defect.
2
6.
What is meant by Refractive index ? If the speed of light in a medium is 2/3rd of the
speed of light in vacuum, find the Refractive index of that medium.
2
7.
Explain, why sun appears white when it is over head at Noon ?
2
8.
Why do we need to use coal and petroleum judiciously ?
2
9.
State modern periodic law. Why are isotopes of an elements having different atomic
masses placed at the same position in the periodic table ?
2
10.
Account for the following :
(a) Although hydrogen resembles halogens in properties yet it is placed in group I of
the periodic table.
(b) Elements of group -18 are called zerovalent.
2
11.
What is watershed management ? How is it helpful to ecosystem ?
2
12.
Describe the role of the following in human male (a) Seminal vesicle
(b) Prostate gland
2
13.
(a)
(b)
Why do testes located in scrotum outside the abdominal cavity ?
What will happen to ovary and ovule after fertilization in angiospermic plants?
2
14.
An object is 2m away from a lens, which forms an erect image one-fourth the size of
the object. Determine the focal length of the lens. What type of lens is this ?
3
15.
A concave mirror produces three times enlarged real image of an object placed at 12
cm in front of it. Calculate the radius of curvature of the mirror.
3
16.
The near point of a person suffering from hypermetropia is 75cm. Calculate the focal
length and power of the lens required to enable him to read the newspaper which is
kept at 25cm from the eye.
3
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17.
(a)
(b)
List and explain in brief the two properties of carbon which lead to huge number
of carbon compound we see around us.
Which of the following hydrocarbon(s) undergo addition reaction ? C2H6, C3H6,
C2H2 , C3H8
3
Name two elements that have two electrons in their outermost shells.
How would the following properties of the element vary down the group in the
modern periodic table ? Give reasons.
(i)
Tendency to lose electron. (ii) Valency
3
18.
(a)
(b)
19.
The genotype of green stemmed tomato plants is denoted as GG and that of purple
stemmed tomato plants as gg. When these two are crossed
(i)
What colour of stem would you expect in their F1 progeny ?
(ii) What is the percentage of purple stemmed plants in F2 progeny if F1 plants are
self pollinated ?
(iii) In what ratio would you find the genotype of GG and Gg in the F2-progeny ?
3
20.
(a)
(b)
What is speciation ?
Explain whether the traits like eye colour or height is genetically inherited or not.
Do power to lift weight and reading French also belong to same category ? Justify
your answer.
3
21.
(a)
(b)
Write two factors which could lead to the rise of a new species.
(i)
What is the scientific term of the organs shown below ?
(ii) How do these organs provide evidence in support of evolution ?
LS
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22.
(a)
(b)
Name an organism in which binary fission occurs in a definite orientation.
Draw a neat diagram of a germinating seed and label on it the following Cotyledon, Plumule, Radicle
23.
It is required to get (i)
a magnified, erect and virtual image
(ii) a diminished, virtual and erect image of a given object.
What type of lens should we use in each case and where should the object be kept ?
Draw a ray diagrams to show the image formation in each case.
Which of these lenses could also form a magnified, real and inverted image of an
object ? Also indicate the position of object for which this could happen ?
OR
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(a)
(b)
24.
(a)
(b)
It is desired to obtain an erect image of an object, using concave mirror of focal
length 20cm.
(i)
What should be the range of distance of object from the mirror ?
(ii)
Will the image be smaller or larger than the object ?
(iii)
Draw ray diagrams to show the image formation in this case.
One half of a convex lens of focal length 20cm is covered with black paper
(i)
Will the lens produce a complete image of the object ?
(ii)
Show the formation of the image of an object placed at 2F1 of such
covered lens with the help of a ray diagram
(iii)
What will happen to the intensity of the image formed by a convex lens
which is partly covered with black paper ?
Write chemical equations for the followings :
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(i)
conversion of ethanol to ethene. .
(ii)
Reaction of ethanol with ethanoic acid in presence of conc. Sulphuric
acid
(iii)
Reaction of ethanol with sodium metal.
What are isomers ? Write any two possible structure for the formula C5H12
OR
(a)
25.
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Illustrate the following reactions with example.
(i)
Substitution reaction
(ii)
Addition reaction
(iii)
Oxidiation reaction
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(b)
What is glacial acetic acid ? Why is it named so ? State its two uses.
(a)
Name a plant in which vegetative propagation takes place by leaves.
(b)
Write the causal organism of the following diseases.
(i)
Warts
(ii)
Syphilis
(c)
Draw a neat diagram of reproductive system of human female and label the
following parts :
(i)
the part which is responsible for providing shelter to the growing embryo.
(ii)
the part where fertilization takes place.
(iii)
the part in which ovum formation takes place.
(iv)
the part which is ligated to avoid fertilization.
OR
(a)
Which device prevents implantation by irritating the lining of uterus ?
(b)
What could be the possible reason for declining female : male sex ratio in our
country. Suggest two measures to achieve 1:1 ratio.
(c)
Name those parts of a flower which serve the same function as the following
do in animals.
(i)
Testis
087/X/SA2/22/A1
(ii)
Ovary
(iii)
Eggs
(iv)
Sperms
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SECTION - B
26.
For the refraction through a rectangular glass slab the diagram is given below
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The angle of incidence, angle of a emergence and angle of refraction are respectively.
(a)
27.
28.
X,P,M
(b)
X,M,P
(c)
Y,M,P
(d)
Y,N,P
In an experiment the image of distant object formed by a convex lens is obtained on
a screen. To determine the focal length of the lens, we need to measure the distance
between the
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(a)
object and the screen
(b)
object and the lens
(c)
lens and the screen
(d)
lens and the screen and also between the object and the screen.
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The focal length of the concave mirror in the experimental set up shown below is :
(a)
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10.3 cm
087/X/SA2/22/A1
(b)
11.0 cm
(c)
11.7 cm
(d)
12.2 cm
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29.
30.
31.
32.
A student is performing a glass slab experiment. Which of the following precautions
he needs not take
(a)
All lines be drawn thin.
(b)
Only one eye is used in fixing two pins on the other side of the slab.
(c)
All pins are fixed vertically.
(d)
Make sure that the first two pins for incident ray are fixed by looking through
the slab.
Out of the following the correct way to do the experiment on finding the focal
length of a convex lens by obtaining the image of a distant object, is to :
(a)
hold the lens in hand and keep the screen in a stand with the screen behind
the lens.
(b)
hold the lens in a stand and hold the screen in hand with the screen in front of
the lens.
(c)
keep both the lens and screen in suitable stands with the screen put in front of
the lens.
(d)
keep both the lens and the screen in suitable stands with the screen put behind
the lens.
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A student added zinc granules to copper sulphate solution taken in a test tube. Out
of the following the correct observation(s) made by the students will be :
Zinc granules have no regular shape.
(ii)
Zinc granules have silvery grey colour in the beginning
(iii)
The colour of zinc granules changed to brownish black
(i) only
(c)
(iii) only
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(b)
(ii) only
(d)
(i), (ii) and (iii)
Four students observed the colour and odour of acetic acid and its reaction with sodium
hydrogen carbonate. They tabulated their observations as given below.
Student Colour of
acetic acid
Odour of acetic Action with
acid
sodium hydrogen
carbonate
A
Blue
Fruity
B
Colourless
Gas evolves
without bubble
Smell of vinegar Effervescence
C
Light green
Odourless
D
Light brown
Rotten egg
Gas evolves
without bubbles
effervescence
The correct of observation is that of student
(a)
A
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(b)
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(a)
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B
(c)
C
(d)
D
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33.
An iron nail was suspended in copper sulphate solution and kept for a while. The
solution
(a) remained blue and a coating was formed on the nail.
(b) turned green and a coating was formed on the nail.
(c) remained blue and no coating was formed on the nail.
(d) turned green and no coating was formed on the nail.
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34.
A strip of copper was placed in a beaker containing zinc sulphate solution. On observing
the strip next day, it was noticed that :
(a) the copper strip remained as it was
(b) the copper strip became thinner
(c) the copper strip became thicker
(d) the colour of the strip changed
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35.
The most appropriate method of testing the odour of a given liquid is :
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(a)
I
(b)
II
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(c)
III
(d)
IV
36.
Select the correct precaution with reference to the procedure to determine the percentage
of water absorbed by raisins.
(a) Raisins should be without stalk
(b) stalked raisins should be gently wiped by filter paper before final weighing.
(c) Raisins must be sundried before final weighing.
(d) Do not wipe the raisins with filter paper after keeping them in water for about
2 hours.
1
37.
A student is given a permanent slide showing binary fission in Amoeba. The following
are the steps in focusing the object under the microscope.
(i)
Place the slide on the stage ; look through the eye piece and adjust the mirror and
diaphragm to get even illumination.
(ii) Look through the eye piece and raise the objective using coarse adjustment until
the object is focused.
(iii) Make the focus sharp with the help of fine adjustment.
(iv) Look through the eye piece and move the slide until the object is visible.
The proper sequence of steps is :
(a) (i), (iii), (iv), (ii)
(b) (ii), (iii), (iv), (i)
(c) (iv), (iii), (ii), (i)
(d) (i), (iv), (ii), (iii)
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38.
Student A,B and C were given five raisins each of equal weight. The raisins were soaked
in distilled water at room temperature. A removed the raisins after 30 minutes, B after
two hours and Cafter one hour If PA, PB and PC denote percentage absorption of
water obtained by students A,B and C respectively, then :
(a) PB>PC>PA
(b) PA<PB<PC
(c) PA<PB>PC
(d) PA=PB=PC
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39.
A slide showing several amoeba was givan to a student and was asked to focus the
amoeba undergoing binary fission. The slide of dividing amoeba to be correctly focused
by the student is (a) an amoeba with many pseudopodia and a small nucleus.
(b) a rounded amoeba with rounded nucleus.
(c) an amoeba covered by a cyst and many nuclei.
(d) an amoeba with elongated nucleus and a constriction in the middle.
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40.
A student weighed 108 raisins and designated the weight as A. She then soaked them
in 50mL distilled water in a beaker. After 2 hours, she removed the raisins, wiped them
dry from outside and weighed again and called that weight as B. For determining the
percentage of water absorbed by raisins, she should calculate as follows :
1
41.
(a)
B 2A
X 100
A
(c)
B 2A
X 100
B
(b)
B 2A
1
X
A
100
(d)
B 2A
1
X
B
100
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After observing a slide under compound microscope a student observed the following
and asked to identify the slide. The correct identification is-
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(a)
(c)
Budding of yeast to form colony (b)
Binary fission in yeast cell
(d)
Spore formation in yeast cell
Regeneration in yeast cell
-o0o-
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