SET A
Roll No.
Code No.
86/2/1
INDIAN SCHOOL MUSCAT
SUMMATIVE ASSESSMENT - II
SCIENCE
Class : 10
Subject Code: 086
13.03.2016
Time Alloted: 3 Hrs.
Max.Marks: 90
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
2
3
4
5
6
7 (a)
(b)
8
9
The atomic number of an element X is 15. Identify its position in terms of group and period in
the modern periodic table.
Why is it that the unit of evolution is population, not the individual ?
Name the gas which is produced due to incomplete combustion of fossil fuels.
Briefly describe an activity to find approximate focal length of a Convex lens.
List four changes in our habits which can make a difference in our energy consumption
patterns.
Draw a sequence of suitable methods of disposal of waste produced at your home to
minimize environmental pollution.
At times we observe the bottoms of cooking vessels getting blackened. Why this happens ?
We use LPG at home which is mainly mixture of propane and butane. Give a balanced
chemical equation for combustion of butane.
Be (4), Mg (12) and Ca (20) belong to the same group in the modern periodic table
(a)
Name the period of each element.
(b)
Write the electronic configuration of each element.
Mineral acids are used in laboratory but carboxylic acid like vinegar is used as a preservative
in pickles.
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1
1
1
2
2
2
3
3
3
(i)
10
11
12
13
14
15
16
17
18
Illustrate vinegar as a weak acid and hydrochloric acid as a strong acid with the help
of ionisation equation.
(ii)
Compare vinegar with glacial acetic acid.
3
Out of the following elements
H(1); Be (4); Na(11); Mg (12)
(a)
Write the pair elements having similar chemical properties.
(b)
state the group number of each pair.
(c)
name one other element belonging to each of these groups.
3
Study of evolution and classification are interlinked. Explain.
3
Identify from the diagram –the type of reproduction used and the organism showing it.
Explain with the help of a figure that father is responsible for the sex of a child.
DNA content has the tendency to double itself during sexual reproduction due to combining
of the genetic materials from two parents. How can the problem of DNA doubling be solved
to maintain the consistency of the genetic material throughout the species ?
What happens when the following situations are initiated :
(a)
A Planaria is cut into three different pieces.
(b)
Leaf of the Bryophyllum with notches falls on the soil.
(c)
Testosterone is released in the male reproductive system
Name the four parts labelled as 1, 2, 3 and 4 in the given diagram of human eye. State the
function of pupil of an eye.
3
3
3
3
3
The following table gives the focal length of some mirrors and lenses.
S. No
1
2
3
4
Device
Concave
Concave
Convex
Convex lens
Mirror
lens
mirror
Focal length 20 cm
15 cm
30 cm
10 cm
Select any two of these devices that may be used to produce an image of the same size as the
object. State also the relevant object distance in each case. Draw a ray diagram for only one
case.
Monika was observing a lizard on the wall which chased an insect and ate it. She felt 3
that the lizard was cruel and ugly. Suddenly the lizard fell off and was eaten by a cat.
She started thinking how organisms are connected to each other for their food.
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19
20
21
22
23
24
(a)
What is a food chain ? Will the world be a better place without lizards ?
(b)
Make a food chain of five organisms.
(c)
Do you think that a lizard is cruel and ugly ?
(d)
To
which
trophic
level
of
the
food
chain
does
lizard
belong ?
(a)
State any three physical properties of carbon compounds.
(b)
Carbon is a versatile element. Justify this statement.
(a)
Why do we say that homozygous plants produce pure progeny ?
(b)
Define heterozygous.
(c)
Explain how the process of speciation takes place.
(i)
(a)
Write full form of DNA.
(b)
State the role of DNA in the cell nucleus.
(c)
What will be the after effect if the information of the DNA is changed.
(ii)
Explain the importance of DNA copying in reproduction.
(a)
Define :
(i)
Atmospheric Refraction
(ii)
Tyndall effect
(b)
Why does the sun appear white at noon time ?
(c)
Why do the stars appear higher than their actual position ?
An object is situated at 20 cm from convex lens of focal length 10 cm. Use lens formula to find
the position and nature of image. Draw ray diagram to explain the formation of image in this
case (not to scale).
(a)
In the figure given below mark the angle of prism, angle of deviation for red and violet
colour and the incident ray.
(b)
Explain how the components of white light can be recombined after a prism has
separated them. Explain with the help of figure.
5
5
5
5
5
5
SECTION - B
25
While preparing soap in the laboratory, Sonia added “X” to vegetable oil and stirred the 1
mixture. She observed that the test tube became hot, then she added sodium chloride and
after sometime “Y”settled at the bottom of test tube.
The substances “X” and “Y” are :
(a)
Sodium carbonate and soap
(b)
Sodium hydroxide and glycerol
(c)
Sodium carbonate and soap
(d)
Sodium hydroxide and soap
26
During saponification reaction, Rupal takes refined oil in a test tube and adds 20% NaOH
solution. She then stirs the reacting mixture and observes that soap formed :
(a)
floats over the resulting solution in the test tube.
(b)
settles down in the test tube.
(c)
dispersed In the resulting mixture in the test tube.
(d)
dissolves in the resulting mixture in the test tube.
1
27
The cleansing action of soap will be the most in the water obtained from the source :
1
Page 3 of 5
(a)
Tap
(b)
Rain
(c)
Well
(d)
Hand pump
28
To perform an experiment of determining the focal length of a convex lens a student was 1
provided with a convex lens of focal length between 20 cm to 25 cm. While focusing a distant
object to find its focal length, he should adjust the position of the screen between :
(a)
40 cm and 50 cm marks on scale from lens.
(b)
20 cm and 25 cm marks on scale from lens.
(c)
15 cm and 20 cm marks on scale from lens.
(d)
25 cm and 30 cm marks on scale from lens.
29
In an experiment to find the focal length of a concave mirror, a graph is drawn between v and 1
u. Choose the correct graph from the graphs given below ?
(a)
A
(b)
B
(c)
C
(d)
D
30
1
The rectangular glass slab experiment shown below, four students A, B, C and D did the following :
(A)
(B)
(C)
Kept the eyes far from the glass slab while placing both the pins P3 and P4
Kept the eyes close to the glass slab while placing both the pins P3 and P4
Kept the eyes close to the glass slab while placing pins P3 and far from the slab while placing
pin P4
(D)
Kept eyes far from glass slab while placing pin P3 and close to slab while placing pin P4
The correct procedure is that of students :
(a)
(A)
(b)
(B)
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(c)
(C)
(d)
(D)
31
A student while doing the experiment of tracing the path of ray of light through a triangular
glass prism is not able to get the image of object (pins) in straight line clearly. This may be due
to :
(a)
the two pins used as object were not fixed vertical.
(b)
angle of incidence was 40
(c)
brightness in laboratory.
(d)
use of white paper on which prism is placed.
1
32
Forelimbs of Lizard are homologous to :
(a)
arm of man
(c)
wings of butterfly
1
(b)
(d)
fins of fish
wings of dragonfly
33
The area between the radicle and the place of origin of cotyledon is termed as :
(a)
Hypocotyl
(b)
Radicle
(c)
Plumule
(d)
Micropyle
34
2
Complete the following statements regarding the study of properties of acetic acid :
(a)
Odour of acetic acid resembles with _________.
(b)
On shaking a mixture of 5 ml acetic acid and 5 ml water in a test tube, it was observed
that the resulting solution appears ________.
(c)
On adding a few drops of acetic acid to solid sodium hydrogen carbonate __________
was observed.
(d)
When a drop of acetic acid was put on red litmus paper, the red litmus paper
__________.
35
In the figure of budding in yeast given below, label the parts shown as A, B, C and D.
36
A student was asked to draw a ray diagram for image formation by a convex lens of focal 2
length 7.5 cm. Find the position where the image will be formed when an object is placed at a
distance of 20 cm in front of it. Also draw a ray diagram for image formation.
1
2
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