CBSE Class 10 Science Question Paper SA 2 2012 (14)

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086/X/SA2/21/B1
Class - X
·¤ÿææ - X
SCIENCE
çߙææÙ
Time : 3 to 3½ hours
â×Ø Ñ 3 âð 3½ ƒæ´ÅðU
Maximum Marks : 80
¥çÏ·¤Ì× ¥´·¤ Ñ 80
Total No. of Pages : 15
·é¤Ü ÂëcÆUæð´ ·¤è ⴁØæ Ñ 15
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
1.
What is the minimum distance between an object and its real image in case of a concave
mirror ?
1
2.
Name the property of carbon element responsible for a large number of compounds
having carbon.
1
1
3.
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What is depicted in the above mentioned scheme ?
4.
Ozone is deadly poisonous, still it performs an essential function. How ?
1
5.
(a)
(b)
We prefer a convex mirror as a rear view mirror in vehicles. Why ?
State a condition for no refraction of light when light enters from one medium to
another.
2
6.
(a)
Why do parallel rays of different colours deviate differently while passing through
a glass prism ?
Name any two phenomenon associated with the formation of rainbow.
2
The increase in demand for fossil fuels is affecting our environment adversely”.
Justify this statement.
Why is LPG considered a better fuel than coal ?
2
(b)
7.
(a)
(b)
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8.
Stars twinkle while the planets do not twinkle. Why ?
2
9.
What are isomers ? Draw the structures of two isomers of butane (C4H10).
2
10.
State the reason for the following :
(a) The elements of the same group have similar chemical properties
(b) The elements of the same period have different properties.
2
11.
Suggest two measures which could be incorporated in daily life to become more
environment friendly.
2
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12.
Differentiate between self pollination and cross pollination.
2
13.
Illustrate the process of regeneration in planaria with the help of a suitable diagram.
2
14.
An object is placed infront of a convex lens of focal length 15 cm. The image formed
is 3 times the size of the object. Calculate the two possible distances of the object
from the lens.
3
15.
(a)
Define 1 dioptre power of a lens.
3
(b)
Two thin lenses of focal lengths 110 cm and 25 cm are kept in contact. Find
the focal length and power of this combination of lenses.
(a)
We wish to obtain an erect image of an object, using a concave mirror of focal
length 15 cm. What should be the range of distance of the object from the mirror?
Draw a ray diagram to show the image formation in this case.
(b)
Why does a ray of light bend when it travels from one medium into another ?
16.
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3
17.
Two carbon compounds A and B have the molecular formula C 3 H 8 and C 3 H 6
respectively. Which one of the two is most likely to show addition reaction ? Explain
with the help of a chemical equation, how an addition reaction is useful in industries.
3
18.
An element X (atomic number 17) reacts with an element Y (atomic number 20) to
form a divalent halide.
3
19.
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(a)
What is the position of elements X and Y in periodic table ?
(b)
What will be the nature of oxide of element Y. Identify the nature of bonding in
the compound formed.
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State one function of each of the following parts of human male reproductive system.
(i)
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Vas deferens
(ii)
Testis
(iii)
3
Prostate gland
20.
How has the method of artificial selection by humans helped in the evolution of different
vegetables ? Explain in brief giving an example.
3
21.
How do Mendel’s experiments show that traits are inherited independently ? Depict
with the help of a cross.
3
22.
Acquired characters are not inherited. Justify the statement with an example. The
wings of bat and the wings of insects are considered analogous organs. Why ?
3
23.
(a)
What is Myopia ? State two causes of Myopia. With the help of a labelled ray
diagram show the correction of Myopia using appropriate lens.
5
(b)
The near point of a hypermetropic eye is 1m. Find the power of the lens required
to correct this defect. Assume that near point of the normal eye is 25 cm.
OR
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(a)
(b)
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What is hypermetropia ? State two causes of hypermetropia. Draw a labelled
ray diagram to show how this defect may be corrected using spectacles of
appropriate focal length.
The near point of a hypermetropic eye is 1.0 m. Find the power of the lens required
to correct this defect. The least distance of distinct vision for a normal eye is
25 cm.
24.
A compound ‘C’ molecular formula (C2H4O2) reacts with sodium metal to form a
compound ‘R’ and evolves a gas which burns with a pop sound. Compound ‘C’ on
treatment with an alcohol ‘A’ in presence of an acid forms a sweet smelling compounds
‘S’ (molecular formula C3H6O2). On addition of NaOH to ‘C’, it also gives ‘R’ and
water. ‘S’ on treatment with NaOH solution gives back ‘R’ and ‘A’. Identify ‘C’, ‘R’,
‘A’, ‘S’ and write the reactions involved.
OR
Write chemical equations to represent what happens when :
(a) ethanol burns in air.
(b) ethanol reacts with sodium metal.
(c) ethanol is heated with alkaline KMnO4.
(d) ethanol is heated with ethanoic acid in presence of few drops of concentrated
sulphuric acid.
(e) ethanol is heated with at 443 k excess of concentrated H2SO4.
5
25.
(a)
(b)
5
(a)
(b)
26.
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State any three advantages of sexual reproduction over asexual reproduction.
Explain what happens to the egg once it gets fertilized in human female.
OR
Draw a diagram showing fertilisation in a flowering plant and label stigma, male
germ cell, pollen grain, egg.
Enlist two advantages of vegetative propagation.
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SECTION - B
Four students traced the path of a ray of light passing through a rectangular glass slab
as shown below
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The trace most likely to be correct is that of student
(a) A
(b) B
(c) C
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(d)
D
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27.
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For the experiment on finding the focal length of a convex lens by obtaining the image
of a distant object following apparatus, is available on the table :
(A)
A stand with a metal needle fixed to it
(B)
A stand with a given convex lens fitted in it
(C)
A wax candle with a match box
(D)
A thick cardboard white screen fitted in a stand
(E)
A metre scale
1
A student can perform the experiment by using the apparatus listed as
(a)
28.
A,B,E
(b)
B,C,D
(c)
B,D,E
(d)
D,A,B
A student focussed the image of a distant object on the screen as shown in the figure by
using a device X. This device ‘X’ could be
1
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30.
(a)
Plane mirror
(c)
Convex mirror
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(b)
(d)
Concave mirror
Convex lens
In an experiment to determine the focal length of a convex lens, a student obtained a
sharp inverted image of a distant tree on the screen behind the lens. She then removed
the screen and looked through the lens in the direction of the object. She will see
w
(a)
an inverted image of the tree at the focus of the lens.
(b)
no image as the screen has been removed.
(c)
a blurred image on the wall of the laboratory
(d)
an erect image of the tree on the lens.
In an experiment to trace the path of a ray of light passing through a rectangular glass
slab, four students tabulated their observations as given below.
Student
∠i
∠r
∠e
A
30 8
18 8
32 8
B
308
208
32.5 8
C
30 8
19 8
30 8
1
1
D
30 8
21.58
29 8
Which student performed the experiment most correctly ?
(a)
A
(b)
B
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(c)
C
(d)
D
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31.
32.
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A strip of zinc was placed in a beaker containing copper sulphate solution. On observing
the strip the next day, it was noticed that :
(a)
the zinc strip remained as it was
(b)
a blue deposit formed on the zinc plate
(c)
the zinc strip becomes thicker
(d)
the colour of the strip becomes reddish brown
A student prepared aqueous solutions of the following four salts :
Salt A
-
Copper Sulphate
Salt B
-
Ferrous Sulphate
Salt C
-
Zinc Sulphate
Salt D
-
Aluminium Sulphate
1
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The colours of these four salt solutions A, B, C and D respectively are :
33.
(a)
Blue, pale green, red, colourless
(b)
Blue, pale green, colourless, colourless
(c)
Blue, dark green, colourless, brown
(d)
pale green, Blue, colourless, colourless.
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Four students observed the colour and odour of acetic acid and its reaction with sodium
hydrogen carbonate. The observation as recorded by the four students A, B, C and D
are given below
Student
colour
A
Pink
B
Colourless
C
D
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odour
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Reaction with sodium hydrogen carbonate
Rotten egg
No reaction
smell of vinegar
Gas evolves which burns with pop
sound
Light blue
smell of vinegar
Gas evolves without bubbles
Colourless
smell of vinegar
Brisk effervescence
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The correct set of observations is that of student :(a)
34.
A
(b)
B
(c)
C
(d)
D
Ethanoic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y
was evolved. The gas was passed through lime water which turned milky. It was
concluded that :
(a)
Solid X is Sodium hydroxide and gas Y is CO2.
(b)
(c)
Solid X is Sodium bicarbonate and gas Y is CO2.
Solid X is Sodium acetate and gas Y is CO2.
(d)
Solid X is Sodium bicarbonate and gas Y is SO2.
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35.
A student took four test tubes I, II, III and IV containing aluminium sulphate, copper
sulphate, ferrous sulphate and zinc sulphate solutions respectively. He placed an iron
strip in each of them. He found a brown deposit formed in test tube
(a)
36.
I
(b)
II
(c)
III
(d)
I
(b)
II
(c)
da
III
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(d)
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IV
Out of the given diagram, the correctly labelled diagram showing budding in yeast is :
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IV
Four stages of binary fission in Amoeba are shown below. The stage at which nuclear
fission and cytokineses are observed is
(a)
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(a)
38.
I
(b)
II
(c)
III
(d)
IV
Following diagrams were drawn by four students A, B, C and D on having observed a
prepared slide of budding in yeast under the fine adjustment of a compound microscope.
The correct diagram is :
(a)
A
(b)
B
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(c)
C
(d)
1
D
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39.
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The figure which does not represent budding is -
(a)
A
(b)
B
(c)
1
C
(d)
D
40.
At the end of the experiment, ‘To determine the percentage of water absorbed by raisins’,
it is advised to wipe the soaked raisins gently by using :
(a) dry cotton cloth
(b) dry cotton wool
(c) silken cloth
(d) filter paper
1
41.
While performing an experiment with raisins a student recorded the following
observations :
Mass of water taken in the beaker
=
30g
Mass of raisins before soaking
=
7g
Mass of raisins after soaking water
=
10g
Mass of water left in the beaker after experiment =
25g
On the basis of these observations the percentage of water absorbed by raisins is :
1
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(a)
(c)
( 30 2 25 ) g
30 g
( 10 2 7 ) g
7g
3 100
(b)
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3 100
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a
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(to )
s
(d)
30 2 25 g
3 100
25 g
( 10 2 7 ) g
10 g
3 100
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3 100
(d)
( 30 2 25 ) g
25 g
( 10 2 7 ) g
10 g
3 100
3 100
-o0o-
086/X/SA2/21/B1
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15
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