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VW40LCN

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 30

(vii) 7 18 50

(viii) 19 24 70

(ix) 25 33

(x) 34 36

General Instructions : (i) The question paper comprises of two Sections, A and B. You are to attempt both the sections.

(ii) All questions are compulsory. (iii) There is no choice in any of the questions. (iv) All questions of Section-A and all questions of Section-B are to be attempted separately. (v) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one

word or in one sentence. (vi) Question numbers 4 to 6 in Section-A are two marks questions. These are to be answered in

about 30 words each. (vii) Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in

about 50 words each. (viii) Question numbers 19 to 24 in Section-A are five marks questions. These are to be answered in

about 70 words each. (ix) 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.

(x) Question numbers 34 to 36 in Section-B are questions based on practical skills. Each question is a two mark question.

SECTION-A

1

Mention the functional group which always occurs at the terminal position of a carbon chain

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of a organic compound.

2

State the function of prostate gland and seminal vesicles

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3

Select the item which is made up of biodegradable material-Plastic bag, leather bag, nylon rope, kettle.

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4

(a)

(b)

(c)

(d)

Mention the kind of lens that can form (a) a real, inverted and magnified image

(b) a virtual, erect and magnified image

(c) a real, inverted and diminished image

(d) a virtual, erect and diminished image

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5

What are the advantages of using a long term perspective in managing the natural resources ?

2

6

Suggest any two methods that should be adopted to ensure that the local air and local water bodies are not polluted.

2

7 X

Y C2H6O

(i) X Y

(ii) C2H6O

A colorless organic liquid ‘X’ has no action on any litmus paper and is used as a nail polish remover. Another colorless organic liquid ‘Y’ of molecular formula C2H6O is used in tincture

of iodine. (i) Identify the functional group present in ‘X’ and to which homologous series does ‘Y’

belong ? (ii) Write the name and chemical formula of C2H6O.

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8 (i)

(ii)

(i) Define covalent bonding and give one example of an element other than carbon which forms covalent bond.

(ii) State the number of valence electrons and valency of carbon atom.

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9 Li Be 3 4

(a)

(b)

(c)

The atomic number of Li and Be is 3 and 4 respectively and they belong to the same period. (a) Which one would have smaller atomic size ? (b) Which one would be more electropositive ? (c) To which group would each one belong ?

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10 (a)

(b)

(c)

(a) Name the elements present in group 1. (b) Write the electronic configuration of third element of this group. (c) Write the valency of group 1 elements.

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11 (a)

(b)

(a) Why are variations incorporated at molecular level significant ? (b) What is the outcome of genetic drift between two sub

populations ?

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12 (a)

(b) F2

(a) What is the physical basis of heredity ? (b) Write the phenotypic and genotypic ratio in F2 generation in a monohybrid cross.

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13 A, B, C

Label the parts A, B and C and write their functions.

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14

(a)

(b)

(c)

Study the diagram given below :

(a) Identify the process. (b) Which organism uses the above method for reproduction ? (c) How is the above method different from the process of fragmentation ?

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15 (a)

(b)

(a) How many gene sets should a germ cell have ? (b) Mention two factors causing evolution.

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16

Briefly describe an activity along with diagram of an experimental set up for observing scattering of light in colloidal solution.

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17 80 cm 10 cm 20 cm

A robot of size 80 cm is placed 20 cm away from a diverging mirror of focal length 10 cm. Write the nature, position and size of the image of the robot.

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18

(a)

(b)

Eco-club of your school is organising a debate on the topic ‘Nature’s Fury Unleashed by Human’s Greed’ (Uttrakhand Disaster). (a) List three arguments that you will use to convince the audience that humans are

responsible for this disaster. (b) List any three values that will be inculcated with this debate.

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19 ‘A’ ‘B’

‘C’

(i)

(ii)

(iii) ‘C’

(iv) ‘C’

An organic compound ‘A’ on heating with another compound ‘B’ in presence of concentrated sulphuric acid forms a sweet smelling compound ‘C’ : (i) Identify the name of this chemical reaction. (ii) Write a balanced chemical equation for the above chemical reaction. (iii) Write one use of compound ‘C’. (iv) Write a balanced chemical equation for the reaction when an acid or a base is added to compound ‘C’.

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20

(a)

(b)

In organisms, some changes pertain to body cells and are not inherited whereas some changes pertain to germ cells and are inheritable. (a) Name the two types of variations respectively. (b) Explain the two ways by which individuals with a particular trait may increase in a

population.

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21

(a)

(b)

Different organisms reproduce by different methods suitable to their body designs. (a) Justify the above statement using examples of three different organisms which reproduce by

different methods of asexual reproduction.

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(b) Differentiate between sexual and asexual modes of reproduction.

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(a)

(b)

(c)

Give reasons for the following : (a) Stars seem higher than they actually are. (b) Stars appear to twinkle where as the planets do not. (c) Danger signal lights are red in colour.

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23 (a)

(b) A, B, C

(i) A, B, C

(ii)

(iii) A B

(iv) B C 1

(a) Define absolute refractive index. (b) The path of a light ray from three different media A, B and C for a given angle of

incidence is shown below. Study the diagrams and answer the following questions.

(i) Which of the three media A, B or C has maximum optical density ? (ii) Through which of the three media, will the speed of light be maximum ? (iii) Will the light travelling from A to B bend towards or away from the normal ? (iv) Will the refractive index of B relative to C be more than unity or less than unity ?

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24 (a)

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(b)

(i)

(ii)

(c)

(a) What is meant by scattering of light ? State the relationship between the wavelength of light and the size of the particle causing scattering.

(b) State the reason for the following observations recorded from the surface of moon :

(i) Sky appears dark.

(ii) Rainbow is never formed.

(c) Why the sun appears white at noon ?

/ SECTION - B

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(a)

(b)

(c)

(d)

The soap prepared in the laboratory is crude soap. It is : (a) fit to use as toilet soap (b) corrosive (c) fit for washing but not for bathing (d) non-corrosive

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(a) (b)

(c) (d)

In a saponification reaction, fats and oils are treated with : (a) A strong acid (b) A weak base (c) A weak acid (d) A strong base

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(a)

(b)

(c)

(d)

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Soap does not form lather in : (a) homogeneous solution of calcium chloride in water (b) tap water (c) rain water (d) river water

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(a)

(b)

(c)

(d)

In an experiment to determine the focal length of a concave mirror by forming image of a distant object the screen should be placed (a) perpendicular to the plane of mirror (b) parallel to plane of mirror (c) inclined at an angle from the mirror (d) in any direction

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29

(a) (A) (b) (B) (c) (C) (d) (D) Which of the following diagram correctly describes the refraction of a parallel beam of light through a convex lens ?

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(a) (A) (b) (B) (c) (C) (d) (D)

30 A, B C

(A)

(B)

(C)

(a) (A) (B) (b) (B) (C)

(c) (A) (C) (d)

A teacher asked three students A, B and C to write one precaution each regarding the experiment on tracing the path of a ray of light through a rectangular glass slab. They wrote following precautions : (A) While tracing emergent ray, we should see heads of pins (B) One eye should be kept closed, while tracing emergent ray (C) Glass slab should have parallel edges The correct precautions are of students : (a) (A) and (B) (b) (B) and (C) (c) (A) and (C) (d) All three

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31 YML

(a) (b)

(c) (d)

In the given figure showing path of ray of light on passing through a glass prism, the angle YML represent:

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(a) angle of prism (b) angle of deviation (c) angle of incidence (d) angle of refraction

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(a)

(b)

(c)

(d)

The wings of bat and wings of insect are analogous as : (a) both are structurally similar but dissimilar in function (b) both are modifications of forelimbs (c) both are structurally dissimilar but functionally similar (d) both are modifications of hindlimbs

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33 A

(a) (b)

(c) (d)

Label the part A in the adjoining diagram, from the following :

(a) Plumule (b) Radical (c) Cotyledon (d) Embryo

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34 A, B, C D 2

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Study the following flow chart and identify A, B, C and D

35 A B

A

B

After observing the slides of binary fission in Amoeba and budding in yeast the observations of two students A and B respectively are as follows : A The daughter cells of Amoeba are smaller than the parent but bud of yeast is larger

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than the parent. B The daughter cells of Amoeba and the bud of yeast are smaller than their respective

parent cells. Whose observation is correct and why ?

36

(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.

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