Set - A
MT EDUCARE LTD.
CBSE - X
SUMMATIVE ASSESSMENT - II
(2015-16)
Set - A
Code No.
Roll No.
32/1
Series RLH
•
Please check that this question paper contains 6 printed pages.
•
Code number given on the right hand side of the question paper should be
written on the title page of the answer-book by the candidate.
•
Please check that this question paper contains 36 questions.
•
Please write down the serial number of the question before attempting it.
SCIENCE (Theory)
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 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 marks question.
... 2 ...
Set - A
SECTION - A
1.
Name the element whose allotropic form is graphite.
1
2.
What are the functions performed by testes in human beings ?
1
3.
A ray of light is incident normally on a plane mirror.
What will be the :
(a) angle of incidence ?
(b) angle of reflection ?
1
4.
For the conservation of forests who can be a stakeholder ?
2
5.
Write the formula of the functional group present in carboxylic acids
and alcohols.
2
6.
State the characteristics of an image formed by a plane mirror.
2
7.
(a) What is meant by catenation ? Name two elements which exhibit the
property of catenation.
(b) Write the names and structural formulae of 2 possible isomers of
hexane.
3
8.
What is a homologous series ? State the characteristics of homologous
series.
3
9.
Give 2 examples each of :
(i) group 1 elements
(ii) group 17 elements
(iii) group 18 elements
1
1
1
10. Name the reaction which is usually used in the conversion of vegetable
oils to fats. Explain the reaction involved in detail. Write a chemical
equation to illustrate your answer.
3
11. What are the different methods of contraception ?
3
12.
2
1
(a) What are STDs ? Give examples of STDs.
(b) What is the role of seminal vesicles and prostate gland ?
13. What is Natural Selection ?
14. (a) Draw a ray diagram to represent how a narrow beam of white light
after dispersion through a prism can be recombined as white light.
3
... 3 ...
Set - A
(b) Name the defects of vision when a person cannot see clearly,
(i) the nearby objects,
(ii) the distant objects.
(c) A person suffering from a defect of vision uses a corrective lens of
power - 2D. Find the nature and focal length of the corrective lens.
3
15. A concave lens has focal length of 15 cm. At what distance should the
object from the lens be placed so that it forms an image at 10 cm from the
lens ? Also find the magnification produced by the lens.
3
16. A dentist uses a mirror in front of a decayed tooth at a distance of 4 cm
from the tooth to get a 4 times magnified image in the mirror. Use mirror
formula to find the focal length and nature of the mirror used.
3
17. Explain 3R’s with one example each.
3
18. Why are bacteria and fungi called decomposers ? List any two
advantages of decomposers to the environment.
3
19. Which element has :
(a) 2 shells, both of which are completely filled with electrons ?
(b) the electronic configuration 2, 8, 2 ?
(c) a total 3 shells, with 4 electrons in its valence shell ?
(d) a total of 2 shells, with 3 electrons in its valence shell ?
(e) twice as many electrons in it’s second shell as it’s first shell ?
1
1
1
1
1
20. (a) Draw a diagram showing longitudinal section of a flower and label
on it :
stigma, ovary, anther, filament.
(b) How is the process of pollination different from fertilisation ?
(Mention 3 points of differentiation)
2
21.
1
(a) What is genetics ?
(b) Give the common name of the plant on which Mendel performed
his experiments.
(c) What for did Mendel use the term factors and what are these
factors called now ?
(d) What are genes ? Where are the genes located ?
22. (a) A true breeding tall plant is crossed with a true breeding short plant.
All the offsprings of the F1 generation are tall. Of these two characters
which one is dominant and which is recessive.
(b) In the tall plants of the F1 generation are selfed. What is the outcome
or ratio of the F2 progeny ?
3
1
1
2
2
3
... 4 ...
Set - A
23. (a) Differentiate between reflection and refraction.
(b) A ray of light is incident on the interface separating diamond and
water. Given that refractive index of diamond and water with respect
to air are 2.42 and 1.33 respectively, complete the diagram by showing
refracted ray and mark angles of incidence and refraction.
(c) Light enters from air to glass having refractive index 1.50. What is the
speed of light in glass ? The speed of light in vacuum is 3 × 108 ms-1.
24. (a) Two convex lenses, A and B have powers P1 and P2 respectively and P2
is greater than P1. Draw ray diagram for each lens to show which one
will be more converging. Give reason for your answer.
(b) 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? What is the nature of the image ? Is the image larger
or smaller than the object ? Draw a ray - diagram to show the image
formation in this case.
1
2
2
2
3
SECTION - B
25. Which of the following can damage optic nerve leading to blindness, if
taken internally ?
(a) CH3COOH
(b) C2H5OH
(c) NaHCO3
(d) CH3OH
1
26. Butanone is a 4–carbon compound having the functional group :
(a) –COOH
(b) –CHO
(c) –CO
(d) –OH
1
27. Buckminster fullerene is an allotropic form of the element :
(a) Phosphorus
(b) Fluorine
(c) Carbon
(d) Sulphur
1
28. A student obtained a blurred image of an object on a screen by using a
concave mirror. In order to obtain a sharp image on the screen, he will
have to shift the mirror.
... 5 ...
Set - A
(a) Towards the screen
(b) Either towards or away from the screen depending upon the position of
the object.
(c) Away from the screen
(d) To a position very far away from the screen
1
29. Meenu placed a concave mirror at 36.8 cm on an optical bench. A clear
image of a distant tree is obtained on screen placed at 18.9 cm. The focal
length of mirror is :
(a) 17.9 cm
(b) 35.8 cm
(c) 18.9 cm
(d) 37.8 cm
1
30. A student was asked to pick up a concave mirror from an assembly of
convex, plane and concave mirrors lying on a table for finding its focal
length. He picks up the right one. He was able to identify concave mirror
because it ........ :
(a) Was depressed at the centre as compared to edges.
(b) Was elevated at the centre as compared to edges.
(c) Was plane at the centre and edges.
(d) Was plane at the centre and elevated at the edges.
1
31. ______________ is the portion on which grafting is done and it provides the
roots ?
(a) Stock
(b) Scion
(c) Both (a) and (b)
(d) None of these
1
32. Bud in notches of leaves of following plant help in its propagation
(a) Radish
(b) Bryophyllum
(c) Bougainvillea
(d) Jasmine
1
33.
1
1
2
3
4
Set - A
... 6 ...
Chose the correct option
(a)
(b)
(c)
(d)
1
2
3
4
Plumule
Radicle
Cotyledon
Radicle
Radicle
Plumule
Seed coat
Plumule
Cotyledon
Seed coat
Radicle
Cotyledon
Seed coat
Cotyledon
Plumule
Seed coat
34. (i) Potato is homologous to
(a) Ginger
(c) Garlic
(b)
(d)
Onion
Tomato
1
(ii) Cabbage is being cultivated for thousands of years and humans
have generated brocoli, cauliflower, kale etc from it. This is an
example of
(a) Natural selection
(b) Genetic drift
(c) Geographic isolation
(d) Artificial selection
1
35. The near point of a person suffering from hypermetropia is 75 cm.Calculate
the focal length and power of the lens required to enable him to read the
newspaper which is kept at 25 cm from the eye.
2
36. Construct Ray diagram to illustrate the formation of a virtual image using
converging lens.
2
All the Best

Set - A
MT EDUCARE LTD.
CBSE X
SUBJECT : SCIENCE
Set - A
Marks : 90
SUMMATIVE ASSESSMENT - II
Date :
MODEL ANSWER PAPER
Time : 3 hrs.
SECTION - A
1.
Carbon
1
2.
The function of testes in human beings is to produce sperms and male
sex hormone called testosterone.
1
3.
(a) 0º
(b) 0º
1
4.
(i) The
(ii) The
(iii) The
(iv) The
people who live in or around forests.
Forest Department of the Government.
industrialists who use various forest produce.
wildlife and nature enthusiasts who want to conserve nature.
2
5.
–COOH, –OH
2
6.
The characteristics of an image formed by a plane mirror are :
1. The image formed by a plane mirror is virtual. It cannot be received
on a screen.
2. The image formed by a plane mirror is erect. It is the same side up as
the object.
3. The image by a plane mirror is of the same size as the object.
4. The image formed by a plane mirror is at the same distance behind
the mirror as the object is in front of the mirror.
5. The image formed by a plane mirror is laterally inverted (or sideways
reversed).
2
7.
(a) The property of direct bonding between atoms of the same element to
form a long chain is called catenation.
Carbon and Silicon shows the property of catenation
Set - A
... 2 ...
(b)
2-methylpentane
8.
9.
10.
2, 3-dimethylbutane
A homologous series is a group of organic compounds having similar
structures and similar chemical properties in which the successive
compounds differ by CH2 group.
Characteristics of Homologous series :
(i) All the members of a homologous series can be represented by the
same general formula.
(ii) Any two adjacent homologous differ by 1 carbon atom and 2 hydrogen
atoms in their molecular formulae.
(iii) The difference in the molecular masses of any two adjacent
homologues is 14 u.
(iv) All the compounds of a homologous series show similar chemical
properties.
(v) The members of a homologous series show a gradual change in their
physical properties with increase in molecular mass.
3
(i) Li,
(ii) F,
(iii) He,
1
1
1
Na,
Cl,
Ne,
K,
Br,
Ar,
Rb,
I,
Kr,
Cs, Fr.
At.
Xe, Rn
Conversion of vegetable oils to fats is called hydrogenation of oil.
Vegetable oils are unsaturated fats having double bonds between some of
their carbon atoms. When a vegetable oil is heated with hydrogen in the
presence of finely divided nickel as catalyst then a saturated fat called
vegetable ghee.
R
R
C
C
+ H2
R
R
(unsaturated fat)
(liquid state)
11.
3
Ni
Heat
R
H
H
C
C
R
R
R
(saturated fat)
(solid state)
Contraception is the method to avoid pregnancy. Various methods of
contraception are as follows :
3
... 3 ...
Set - A
Physical Barrier Methods : Use of condoms, diaphragms, cervical caps
can be used. These prevent the entry of sperms into the female genital
tract by acting as a barrier between them.
Chemical Methods : Oral pills can be used which change the hormonal
balance and stop release of egg. Vaginal pills kill the sperms.
Surgical Methods : These include vasectomy (sperm duct is removed) in
males and tubectomy (removal of small portion of fallopian tube) in females.
Other : IUCD (Intra-uterine Contraceptive Device) like the copper-T, the
loop prevent the implantation of the fertilized egg.
12.
3
(a) STDs are Sexually Transmitted Diseases. Examples of sexually
transmitted diseases are :
Bacterial STDs – Gonorrhoea, Syphilis.
Viral STDs – AIDS, Warts.
2
(b) These are the accessory glands associated with the male reproductive
system. Seminal vesicles and prostrate gland secrete a fluid which
makes the transport of sperms easier and also provides nourishment
to the sperms. This fluid together with the sperms is called the semen. 1
13. According to Darwin, natural selection is the process which brings about
evolution of new species of plants and animals.
It consists of the following processes :
1. He noted that the size of population tends to remain constant despite
the fact that more offsprings are produced than needed.
2. Variations provide adaptations.
3. The best adapted survive in the changing environment. (Survival of
the fittest).
4. Nature selects the best organisms with better adaptations and after
many generations new species are formed, (Natural Selection).
3
14. (a)
(b) (i)
Hypermetropia
(c) P = – 2D,
P
1
100

  50 cm
f
2
Lens – Diverging – Concave.
15. f =- 15 cm, v = - 10 cm, u = ?
1 1

v u
(ii) Myopia
=
1
f
3
... 4 ...
1
1

-10 -u
=
1
-15
1
-u
=
1
1

-15 -10
=
32
-30
=
1
-30
u =
Magnification, m
16.
=
Set - A
-30 cm
 10
v
1
=  30 =
u
3
3
u   4cm; m  4
m 
v
u
v  m u
v  16cm
Mirror formula
1 1 1
 
f
v u
vu
4  16
f 

uv
4  16
f 
64
  5.33cm
12
– ve sign of focal length indicates that mirror is concave.
Nature of image – Real and inverted.
3
17. The 3R’s are Reduce, Recycle, Reuse.
Reduce – Less use of products like paper, clothes, plastic, wood, coal,
petroleum so that it is not exploited from the nature.
Recycle – To make new items from the used articles like plastic, paper,
wood, glass, etc.
Reuse – Use the same thing again and again. e.g., use the jam and pickle
containers for keeping kitchen stuff, etc.
3
18. Bacteria and fungi are called decomposers as they breakdown the dead
remains and waste of organisms. They convert the organic complex
substances into simple inorganic substances that go into the soil and are
used up by plants. They recycle the organic matter in nature.
3
Set - A
... 5 ...
19. (a)
(b)
(c)
(d)
(e)
1
1
1
1
1
Neon (2, 8)
Magnesium
Silicon (2, 8, 4)
Boron (2, 3)
Carbon (2, 4)
20. (a)
Stigma
Anther
Filament
Ovary
2
3
(b)
Fertilisation
Pollination
1.
2.
3.
Transfer of pollen grains from
anther to stigma of a flower.
It is a physical process, no new
substance is formed.
1.
Its types are se lf or cross
pollination.
c.
b.
Fusion of pollen nucleus and
ovule in the ovary.
It is a chemical process in
which a new material called
zygote is formed.
Its type s are inte rnal and
external fertilisation.
21. (a) Science which deals with the study of heredity and variations is
called genetics.
(b) Garden Pea plant (Pisum sativum).
(c) Mendel termed ‘genes’ as factors.
(d) Genes are the unit of inheritance. It is a part of the chromosome which
controls the appearance of a set of hereditary characters.
Genes are located on the chromosome.
22. (a)
Parents
Tall Plants
TT
Short
tt
gametes
T
t
Tt
tall
F1 generation
(b) From the results of the F1 generation, ‘tall’ is the dominant trait as it
is expressed in the F1 generation and ‘dwarf’ is the recessive trait as
it is not expressed in the F1 generation.
1
1
1
2
2
Set - A
... 6 ...
Parent
tall
Tt
gametes
T
tall
Tt
t
T
T
t
T
TT
Tt
t
Tt
tt
TT
Tall
Phenotypic Ratio
Tt
tall
t
Tt
tall
tt
short
Tall: short
3:
1
3
Genotypic Ratio 1(TT) : 2(Tt) : 1(tt)
23. (a) Bending of a ray of light as it passes from one medium to other —
Refraction.
Ray of light on striking surface returns to same medium — Reflection.
1
(b)
Diagram
i and r marked
(c) v= c/n = 3 × 108/1.5 = 2 × 108 m/s
24. (a)
P
2
2
2
> P1  F 2 < F 1
A
B
B is more converging because rays are refracted more.
2
Set - A
... 7 ...
(b) In order to obtain an erect image of an object with a concave mirror,
the object should be at a distance less than its focal length. Here the
focal length of concave mirror is 15 cm. So to obtain an erect image of
the object by using this concave mirror, the object should be placed at
any distance which is less than 15 cm from the mirror. The nature of
image will be virtual and erect. The image will be larger than the
object.
A'
5
B
C
F
B
P
B'
3
SECTION - B
25. (d) CH3OH
1
26. (c) –CO
1
27. (c) Carbon
1
28. (a) Blurred image is seen only when the separation between the screen
and mirror is less than focal length.
1
29. (a) f = 36.8 – 18.9 = 17.9 cm
1
30. (a) Was depressed at the centre as compared to edges.
1
31. (a) Stock
1
32. (b) Bryophyllum
1
33. (d) Radicle, Plumule, Cotyledon, Seed coat
1
34. (i) (a) Ginger (as potato and ginger are both underground stems and does
the function of storage of food.)
(ii) (d) Artificial selection
1
1
Set - A
... 8 ...
35. u = -25 cm
v = -75
1 1 1
1
1
1
1
1
1
2
1
  

 

 

v u f
75 25 f
75 25 f
75
f
 f  37.5 cm 
So,
36.
P
37.5
 0.375m
100
1
100
1000


 2.66 D
f
0.375
375
2
A'
2
M
A
B'
2F1
F1 B
O
N

F2
2F2