Mock SUMMATIVE ASSESSMENT – II (2016-17)
SCIENCE
Class – X
Time allowed : 3 hours
Maximum 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
State maximum covalence of carbon.
1
2
Trilobite, Ammonite are which type of fossils ?
1
3
Write the main aim of conservation of biodiversity?
1
4
2
If the ciliary muscles of a normal eye are in their
(a)
most relaxed state
(b)
most contracted state. Mention in brief how focal length and power of eye lens will
change in both the cases. Give reason for your answer.
5
Industrilization is one of the major causes of deforestation. State its two reasons.
6
Though the kulhads are made up of clay which is an eco-friendly substance but their use has 2
been discontinued in the trains now-a-days. Explain those reasons which lead to
discontinuance of this practice.
7
How does ethanoic acid dissociates in water ? Is it a strong acid or a weak acid ? Give reason.
Page 1 of 6
2
3
Give its reaction with a base such as sodium hydroxide.
8
(a)
(b)
(c)
Identify the elements amongst the following that would belong to the same group,
H, He, Li, B, C
State the group number.
Name another element belonging to the same group.
3
9
Write the structural formula and IUPAC name of the following :
(i)
A carboxylic acid with four carbon atoms
(ii)
An alkyne with three carbon atoms
(iii)
An alcohol having one carbon atom
3
10
Two elements X and Y have atomic number 11 and 17 respectively.
(a)
Write the electronic configuration of both
(b)
Which type of bond will they form ?
(c)
Write the formula of the compound formed by them with each other
3
11
What will happen if both the characters present in F1 generation pass together in F2 3
generation ?
12
(a)
(b)
13
(a)
(b)
(c)
14
(a)
(b)
Name the glands that add their secretions to the flow of sperms through vasdeferens. 3
State the role of these secretions.
Why is vas deferens an important part of the male reproductive system ?
What function is performed by human arms, forelimbs of dog and forelimbs of whales 3
?
Which type of organs are these ?
Why do we call them so ?
How would you relate the following methods to asexual reproduction ?
(i)
Binary fission
(ii)
Spore formation
State any one advantage of using sexual reproduction over asexual reproduction.
3
15
Budding is a type of asexual reproduction used by Hydra.
3
(a)
What is meant by asexual reproduction ? How is it different from sexual reproduction
?
(b)
Name any other type of asexual reproduction used by Hydra ? Define it.
16
A person is not able to see objects beyond 2 m from it. Identify giving reason the defect he is 3
suffering from. Mention the position relative to retina where his eye is forming image. State
the nature, of the lens used to correct the defect.
Page 2 of 6
17
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.
18
Yamuna River passing through 22 km in Delhi was once described as the lifeline of the city, 3
but today it has become one of the most polluted rivers in the country. According to the
Central Pollution Control Board (CPCB) the water quality of Yamuna River falls under the
category "E" which makes it fit only for recreation and industrial cooling. It is completely unfit
for underwater life.
(a)
Give two possible causes of water pollution in Yamuna river.
(b)
Suggest any one method by which the pollution could be reduced in the Yamuna
river.
(c)
Mention the values portrayed by you here?
19
Atomic radii of some elements like C, Li, N, O, B and Be are 77, 152, 74, 66, 88 and 111 pm 5
respectively.
(a)
Rearrange them in decreasing order of their atomic radii.
(b)
Name the elements which have largest and the smallest size respectively.
(c)
Give reason for the change in atomic radius as you move from left to right in a
period.
20
(a)
(b)
(c)
Why do we say that homozygous plants produce pure progeny ?
Define heterozygous.
Explain how the process of speciation takes place.
21
(a)
The two cells formed after DNA copying are similar but not identical. What reason can 5
be associated for this ?
Variation though leads to certain changes in an individual but is useful for the
survival of species over time. Justify this statement.
Is the consistency of DNA copying important during reproduction ?
(b)
(c)
5
22
An old person is unable to see the things around him clearly. The doctor said that the eye lens 5
has become cloudy. What is this condition called ? How can it be corrected ? What will
happen if the eyes are not treated ?
Why do we have two eyes for vision and what difference does it make on seeing from one eye
or two eyes ?
23
(a)
(b)
(c)
Page 3 of 6
5
“The refractive index of rock salt is 1.54.” What is meant by this statement ?
Draw a ray diagram to show that the incident ray of light is parallel to emergent ray
when light falls obliquely on a side of a rectangular glass slab.
The refractive index of diamond is 2.42 and that of glass is 1.51. How much faster does
light travel in glass than in diamond ?
24
(a)
A parallel beam of light is focussed at a distance of 10 cm by a concave mirror. Find 5
the focal length of the concave mirror.
(b)
Study the diagram given below and answer the following questions
mirror A
mirror B
mirror C
Which of the three mirror is convex mirror ?
For the reflected rays shown in the above diagrams draw the corresponding
incident ray.
(iii)
Out of the three mirror A, B and C identify the one used by dentist to observe
cavities in the teeth.
(iv)
Identify the mirror which reflects a parallel beam of light as a converging
(i)
(ii)
beam.
SECTION - B
25
The alkali used to prepare soap is :
(a)
sodium hydroxide
(c)
magnesium hydroxide
26
After completion of saponification process the hot reaction mixture is poured into :
(a)
salt solution
(b)
water
(c)
alcohol
(d)
acetone
27
Take four test tubes labelled as I, II, III and IV each having water. Dissolve sodium sulphate in 1
test tube I, calcium sulphate in test tube II, magnesium sulphate in test tube III and potassium
sulphate in test tube IV. The test tubes in which water behaves as soft water is/ are :
(a)
Only in II
(b)
Only in IIII
(c)
In II and III
(d)
In I and IV
28
If you have to determine the focal length of a
have :
(a)
a convex lens and a screen.
(b)
a convex lens and a lens holder.
(c)
a lens holder, a screen holder and a scale.
(d)
a convex lens, a screen, holders for them and a scale.
29
A student has to do experiment to find the focal length of a concave mirror by using a distant 1
object. The following four set-ups are available to him :
(A)
a screen, a mirror holder and a scale, screen holder
(B)
a mirror holder, a screen holder and a scale,
Page 4 of 6
(b)
(d)
1
calcium hydroxide
lithium hydroxide
convex
lens,
you
1
should 1
(C)
a screen holder and a scale
(D)
a mirror holder and a screen holder
The set-up that is likely to give him the best result, is the set-up labeled as.
(a)
A
(b)
B
(c)
C
(d)
D
30
While performing an experiment “to trace the path of a ray of light through a rectangular 1
glass slab” one must take the following precautions :
(I)
The experiment should be conducted for the angle of incidence between 30 and 60.
(II)
The pins should be fixed in upright positions by applying a gentle pressure with the
thumb.
(III)
Distance between two pins must be nearly between 5 cm and 8 cm.
(IV)
The eye must be in line with the feet of the pins while fixing them on other side of slab.
Choose the correct precautions :
(a)
I and III
(b)
II and IV
(c)
II, III, and IV
(d)
All of these
31
While doing the experiment of tracing the path of ray of light through a triangular glass prism 1
a student takes precautions :
(A)
position of prism should be fixed while doing experiment.
(B)
angle of incidence should not be less than 30.
(C)
two pins taken as object should be placed on incident ray at proper
distance
from each other.
(D)
locate the position of image keeping both eyes open.
One of the precautions is not appropriate. It is :
(a)
(A)
(b)
(B)
(c)
(C)
(d)
(D)
32
Forelimbs of man and frog are examples of :
(a)
homology
(b)
(c)
diversity
(d)
33
The condition needed by most seeds to break dormancy is :
(a)
exposure to heat
(b)
exposure to moisture
(c)
exposure to cold
(d)
sowing in soil.
1
34
Study the following flow chart and identify A, B, C and D
2
Page 5 of 6
analogy
variations
1
35
A student tried to observe the slide of binary fission in amoeba under a microscope. After 2
focussing on the slide he was not able to get a clear view even after adjusting the diaphragm.
Suggest two possible modes of adjustments of the microscope to get a clear view of the slide.
36
In the given figure PQ is an object placed in front of a converging lens L. F1 and F2 are two 2
foci and F1O F2 is principal axis.
Complete the ray diagram to locate the position of image formed after refraction through it.
Also compare the size of image and the object.
Page 6 of 6