1M6WLF4
SUMMATIVE ASSESSMENT – II (2014-15)
II
SCIENCE /
Class – X /
X
3
90
Time allowed : 3 hours
Maximum Marks : 90
(i)
(ii)
(iii)
(iv)
(v)
1
3
(vi)
4
6
(vii)
7
18
30
(viii)
19
24
(ix)
25
33
(x)
34
50
70
36
General Instructions :
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
The question paper comprises of two Sections, A and B. You are to attempt both the sections.
All questions are compulsory.
There is no choice in any of the questions.
All questions of Section-A and all questions of Section-B are to be attempted separately.
Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one
word or in one sentence.
Question numbers 4 to 6 in Section-A are two marks questions. These are to be answered in
about 30 words each.
Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in
about 50 words each.
Question numbers 19 to 24 in Section-A are five marks questions. These are to be answered in
about 70 words each.
Question numbers 25 to 33 in Section-B are multiple choice questions based on practical skills.
Each question is a one mark question. You are to select one most appropriate response out of
the four provided to you.
Question numbers 34 to 36 in Section-B are questions based on practical skills. Each question
is a two mark question.
SECTION-A
1
1
Draw the structure of propanone.
Page 1 of 12
2
1
State the function of placenta.
3
1
Crop fields are called artificial ecosystems. Justify.
4
2
75 cm
25 cm
After examining eyes of a person doctor tells him that he has cataract ? State what happens to
the eye in such a state ? Suggest one method of its correction.
The near point of a hypermetropic eye is at 75 cm from the eye. What is the nature of lens
required by him to read clearly a book held at 25 cm from the eye ?
5
2
How are large dams built on rivers advantageous to us ? Give any two advantages ?
6
2
Define biological magnification. Will the levels of this magnification be same or different at
different trophic levels ?
7
3
(i)
(ii)
Vegetable oils containing unsaturated fatty acids are good for health where as use of saturated
fat causes health problem.
(i)
Write the name of one saturated hydrocarbon and one unsaturated hydrocarbon.
(ii)
How could you convert unsaturated fat to saturated fat ?
8
H SO
3
2
4
RCOOHROH 
 RCOOR
'X'
(i)
„X‟
(ii)
R
C2H5
„X‟
H SO
2
4
RCOOHROH 
 RCOOR
heat
'X'
(i)
Identify the functional group present in „X‟.
(ii)
Frame
the
chemical
equation
where RC2H5. Name the product thus obtained.
Page 2 of 12
for
the
given
reaction,
9
3
Name two elements which show the same type of chemical property as calcium. Give reason
for the selection of elements along with any one chemical property.
10
3
Explain how the tendency of non metallic character changes on moving down a group in the
periodic table ?
11
3
Name three organisms which are fossilized.
12
3
Explain with the help of a figure that father is responsible for the sex of a child.
13
3
(a)
(b)
Which process is depicted in the diagram below ?
(a)
(b)
Identify the organism.
How is the above process different from reproduction ?
14
3
Explain any three methods that can be used for avoiding pregnancy
Page 3 of 12
15
3
Why does Planaria reproduce by regeneration ? Explain the process.
16
(a)
3
(b)
(a)
(b)
Mention the role of crystalline lens in the human eye.
How does the focal length of the eye lens change when we shift looking from a nearby
object to a distant object ?
17
3
A mirror is used by doctors to examine teeth of a patient. The same mirror can also be used in
solar furnaces for producing high temperature. Draw ray diagrams to illustrate the use of
these mirrors for both situations.
18
3
Ravi advised villagers to wear an extra sweater instead of using a heating device (heater or
sigri) in winter. Mention any two reasons behind this advice. List any two values that would
be developed among villagers.
19
5
(i)
(ii)
(iii)
(iv)
(v)
Explain the following terms with the help of chemical reactions :
(i)
Oxidation reaction
(ii)
Hydrogenation reaction
(iii)
Substitution reaction
(iv)
Esterification reaction
(v)
Saponification reaction
20
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5
(d)
_____
_____
Write the recessive trait in case of the following dominant traits.
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(d)
Write the dominant trait in case of the following recessive trait.
Recessive
Dominant
Yellow pod colour
_____
Green seed colour
_____
21
5
Draw a longitudinal section of a flower and label any six of the following parts :
anther, filament, petal, sepal, stigma, style, ovary (any six)
22
(a)
5
(i)
(ii)
(b)
(c)
(a)
(b)
(c)
Page 6 of 12
Define :
(i)
Atmospheric Refraction
(ii)
Tyndall effect
Why does the sun appear white at noon time ?
Why do the stars appear higher than their actual position ?
A, B, C
23
A
B
C
D
(a)
D
5
1.33
1.44
1.55
1.66
(b)
(c)
B
C
Refractive indices of four media A, B, C and D are given below :
Medium
Refractive index
A
1.33
B
1.44
C
1.55
D
1.66
(a)
In which of the given media is the speed of the light maximum and minimum ?
(b)
Which of them is the most optically dense and which one is the least optically dense
medium ?
(c)
Calculate refractive index of medium B with respect to medium C. Give reasons for
your answers.
24
5
Draw a diagram of human eye. Label the following parts and give their functions :
pupil, eye lens, ciliary muscles, retina.
/ SECTION - B
25
1
(a)
(b)
(c)
(d)
Effect of soap solution on litmus is :
(a)
blue litmus turns red
(b)
red litmus turn blue
(c)
blue litmus becomes colourless
(d)
red litmus becomes colourless
26
Page 7 of 12
1
“X”
(a)
(b)
(c)
(d)
Ritu performed saponification reaction and after the reaction was complete, her test tube
appeared as shown in the following figure :
Substance “X” is :
(a)
Glocose
(c)
Glycerol
(b)
(d)
Glycol
Gelatin
27
1
(a)
(b)
(c)
(d)
The cleansing action of soap will be the most in the water obtained from the source :
(a)
Tap
(b)
Rain (c)
Well
(d)
Hand pump
28
1
A
f1
B
f2
C
f3
(a)
f1f2f3
(b)
f1 < f 2
f1< f3
(c)
f3 < f1 < f2
(d)
f1f3
f1 < f2
Three students measured the focal length of a convex lens using parallel rays from a distant
object. All of them measured the distance between the lens and the inverted image on the
screen as -Student A saw a sharp image and labelled the distance as f1.
Page 8 of 12
Student B saw a slightly larger blurred image and labelled the distance as f2.
Student C saw a slightly smaller blurred image and labelled the distance as f3.
The relationship between three distances would most likely be :
(a)
f1f2f3
(b)
f1< f2 and f1< f3
(c)
f3 < f1 < f2
(d)
f1f3 and f1< f2
29
1
6
(a)
9.4
(b)
6
(c)
9.8
(d)
9.0
While performing an experiment to determine the focal length of a convex lens the teacher
asks a student to fix the given screen at an appropriate place in the given experimental set-up,
so that a clear image can be obtained on the screen. If the focal length of the convex lens is
6 cm, at which mark on the scale he should fix up the screen ?
(a)
(c)
9.4 cm
9.8 cm
(b)
(d)
6 cm
9.0 cm
30
1
I, II, III
IV
AB
Page 9 of 12
CD
P
Q
I
i
e
II
e
i
III
e
i
IV
i
e
(a)
I
(b)
II
(c)
III
(d)
IV
In the above diagram of tracing the path of a ray of light through a rectangular glass slab, four
students I, II, III and IV recorded their observations in respect of incident ray, emergent ray,
incident angle, emergent angle as given in the following table :
Student
I
II
III
IV
Ray
AB
Emergent ray
Incident ray
Emergent ray
Incident ray
CD
Incident ray
Emergent ray
Incident ray
Emergent ray
The correct observation is of student :
(a)
I
(b)
II
(c)
III
(d)
Angle
P
i
e
e
i
Q
e
i
i
e
IV
YML
31
(a)
(b)
(c)
(d)
In the given figure showing path of ray of light on passing through a glass prism, the angle
YML represent:
(a)
(c)
Page 10 of 12
angle of prism
angle of incidence
(b)
(d)
angle of deviation
angle of refraction
1
32
1
(a)
(b)
(c)
(d)
Tendrils of Pea and spines of Berberis are homologous organs as :
(a)
(b)
(c)
(d)
both have a similar function.
both store water.
spines provide mechanical support.
both are modified leaves.
33
1
(a)
(b)
(c)
(d)
Identify which of these is not a dicot seed.
(a)
Pea
(b)
(c)
Maize
(d)
(kidney bean)
Red kidney bean
Gram
A
34
B
The following symbols A and B are usually shown on the bottle of commercial acetic acid.
What does these symbols indicate ?
Page 11 of 12
2
35
2
Write the various steps of the procedure of observing binary fission in amoeba.
36
2
(a)
(b)
.
A ray of light after refractions from a convex lens becomes parallel to the principle axis of lens.
(a)
What is the position of the object ?
(b)
Complete the ray diagram.
-o0o0o0o-
Page 12 of 12