F7D5GKISUMMATIVE ASSESSMENT – II (2013-14)

SCIENCE Class – X

Time allowed : 3 hours Maximum Marks : 90

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 7 in Section-A are two marks questions. These are to be

answered in about 30 words each.(vii) Question numbers 8 to 19 in Section-A are three marks questions. These are to be

answered in about 50 words each.(viii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be

answered in about 70 words each.(ix) Question numbers 25 to 42 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.

SECTION-A

1 State maximum covalence of carbon. 1

2 Give a method used by Rhizopus to increase its population. 1

3 Mention the name of biotic components which make up an ecosystem. 1

4 What will be the consequences if all the carbon of all fossil fuel is converted into carbon dioxide ?

2

5 Non-biodegradable materials do not break down by the action of microorganism. Will there be 2

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any effect of heat and pressure if they remain on the land for a long time ?

6 State the laws of reflection. 2

7 What is genetic drift ? 2

8 All the members of group 1 are metals. Li and Na reacts with water rapidly whereas K, Rb and Cs react vigorously. Write electronic configuration of Li and K and find valency from the given information. Infer the change in reactivity in a group given. (Atomic numbers of Li and K are 3 and 19 respectively.)

3

9 (a) Name the element with atomic number 4.

(b) To which group does it belong ?

(c) To which period does it belong ?

(d) Write its electronic configuration

3

10 An element A is in the third group of periodic table. Write the chemical formula of its oxide and chloride.

3

11 Explain how the tendency to form electropositive ions change on moving down a group ? 3

12 A part of the male reproductive system is shown below. Study the diagram and answer the questions that follow.

(a) Two parts have been incorrectly labeled. Identify them.

(b) Give the function of urethra.

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(c) Which hormone is released by testis ?

13 The genotype of a round seeded pea plant is denoted as RR and that of wrinkle seeded plants as rr. When cross between them occurs :

(a) What will be the phenotype expected in F1 generation ?

(b) Give the % age of wrinkle seeded plants if F1 plants are self pollinated.

(c) In which ratio do you find RR, rr and Rr in F2 progeny ?

3

14 A child questioned his teacher that why do organisms resemble their parents more as compared to grand parents. In which way will the teacher explain to the child ?

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15 Define the following processes as used as a method of reproduction. (a) Fragmentation

(b) Self-pollination

(c) Vegetative propagation

3

16 (a) A beam of white light splits into component colours when it passes through a prism. Name this phenomenon and give its reason.

(b) List the colours into which it splits on emergence from prism in increasing order of angle of deviation.

3

17 A person cannot see objects beyond 1.2 m distinctly. Giving reason name the defect of vision and find the power and nature of corrective lens.

3

18 Define magnification produced by a mirror in terms of height of on object and image. How is it related to object and image distance. Explain why magnification is positive for virtual image and negative for real image ?

3

19 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.

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

20 Classify the following organic compounds on the basis of their unique chemical properties write the chemical equation for the one indicated in the column.

Compounds Reaction with

(i) C2H5OH sodium

(ii) CH3COOH sodium carbonate

(iii) CH3COOCH3 sodium hydroxide

(iv) CH2 CH 2 hydrogen

(v) CH4 chlorine molecule (in presence of sunlight)

5

21 (a) When a pesticide is sprayed on a population of insects, all insects do not get killed but few of them survive. Give reason

(b) When is a recessive trait capable of expressing itself ? Write its expression with respect to height of plant (genotype).

5

22 Define the following :

(i) Gene (ii) Genetic drift

(iii) Recessive trait (iv) Evolution

(v) Genetics

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23 (a) A student places a pencil in a glass filled with water. Explain the observation made by him with the help of figure.

(b) State Snell’s law.

(c) Draw a ray diagram to show image formed by a concave lens for the object placed at infinity. How will the nature of image be effected if object starts moving closer to the lens. Justify your answer with reason.

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24 (i) Define magnification for a lens.

(ii) If magnification for a lens is positive what will be the nature of image formed by a lens. Give reason for your answer.

(iii) Velocity of light in water is 3/4 times the velocity of light in vacuum. Find the refractive index of water.

(iv) What is meant by optically denser and optically rarer media.

(v) Why is absolute refractive index of a medium always greater than 1.

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SECTION - B

25 A dilute solution of acetic acid in a test tube is given to a student. He introduced a strip of moist blue litmus paper into it and noted the following observation :

(a) blue litmus strip does not change its colour

(b) blue litmus strip changes to red

(c) blue litmus strip changes to colourless

(d) blue litmus strip changes to green

1

26 When Acetic Acid is added to a solution of substance X a colourless gas Y which extinguishes burning candle is formed. Identify X and Y respectively :

(a) Sodium bicarbonate and Oxygen

(b) Sodium hydroxide and Carbon dioxide

(c) Sodium bicarbonate and Carbon dioxide

(d) Sodium acetate and nitrogen

1

27 During the saponification reaction oils and fats are treated with :

(a) a strong base (b) a strong acid

(c) a weak base (d) a weak acid

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28 Nature of soap is :

(a) acidic (b) basic

(c) neutral (d) amphoteric

1

29 Soap does not form lather with :

(a) Soft water (b) Rain water

(c) hard water (d) distilled water

1

30 (During an experiment to find out the focal length of convex lens a student got a clear image of a test object at a far distance on the screen but he did some mistake in making measurements is shown below in diagram. The mistake he did while finding the focal length is :

(a) Distance of screen from object was not measured.

(b) Object distance was not measured.

(c) lens was not adjusted properly.

(d) Distance of image was not measured from the optical center of the lens.

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31 A student performs an experiment to find the focal length of a convex lens. The image formed in this case would be :

(a) real and enlarge (b) virtual and enlarged

(c) virtual and diminished (d) real and diminished

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32 In the experiment on refraction of light through a glass slab done by four students A, B, C and D, the following observations were made :

(A) The emergent ray moves towards the normal after second refraction through glass slab with ie

(B) The emergent ray moves away from the normal after second refraction through glass slab with i < e

(C) For any angle of incidence, always i > e

(D) The emergent ray moves away from normal after second refraction through glass slab with ie

The student who has made the correct observation is :

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

(c) (C) (d) (D)

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33 In the experiment on tracing the path of a ray of light passing through a rectangular glass slab, the correct setting of the protractor for measuring the angle of incidence and the angle of emergence respectively, corresponds, to diagram :

(a) (K) (b) (L)

(c) (M) (d) (N)

1

34 The diagram represented below illustrates : 1

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(a) Formation of pseudopodia in amoeba.

(b) Bud formation in yeast.

(c) Sporulation in amoeba.

(d) Binary fission in amoeba.

35 In which type of reproduction the identify of the parent is lost ?

(a) Budding (b) Sexual

(c) Layering (d) Sporulation

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36

A student while doing the experiment to trace the path of light ray through a rectangular glass prism made a ray diagram of the experiment. The mistake he did in making the diagram is :

(a) angle of incidence is on the right side of prism.

(b) normal is drawn wrongly.

(c) prism is placed on the wrong base.

(d) emergent ray is wrongly drawn.

1

37 A prism is used to :

(a) to deviate a light path by refraction.

(b) to deviate a light path by reflection only.

(c) to pass the light undeviated.

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(d) to refract, reflect or diffract the light depending on experimental condition.

38 If an object whose shape is is placed at the 2f of a convex lens, than the image formed on screen will be

(a) (b) (c) (d)

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39

An image is formed by a converging lens. Suppose the bottom half of the lens in covered, as shown, the expected changes to image will be :

(a) The image disappears.

(b) The image fades

(c) The image is formed closer to the lens.

(d) The bottom half of the image disappears.

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40 The wings of birds and flippers of seal are examples of :

(a) homologous organs (b) analogous organs

(c) vestigeal organs (d) fossilized organs

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41 Tendrils in Passiflora are modified stem, tendrils in Pea are modified leaflets and thorns of Bougainvillea are modified stem. The homologous organs are of :

(a) Passiflora and Pea.

(b) Passiflora and Bougainvillea.

(c) Pea and Bougainvillea.

(d) Pea, Passiflora and Bougainvillea.

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42 Make the correct match for Part A and Part B of a dicot seed where :

A-shoot forming B-root forming

The correct match is :

A B

(a) Radical Plumule

(b) Plumule Hypocotyle

(c) Plumule Radicle

(d) Hypocotyle Radicle

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