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SUMMATIVE ASSESSMENT II, 2012

II, 2012SCIENCE /

Class X / XTime allowed : 3 hours Maximum Marks : 80

3 80General 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 overall choice. However, internal choice has been provided in all the five

questions of five marks category. Only one option in such questions is to be attempted.

(iv) All questions of Section-A and all questions of Section-B are to be attempted separately.

(v) Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in

one word or in one sentence.

(vi) Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered

in about 30 words each.

(vii) Question numbers 14 to 22 in Section-A are three marks questions. These are to be

answered in about 50 words each.

(viii) Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered

in about 70 words each.(ix) Question numbers 26 to 41 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.

(i)

(ii)

(iii)

(iv)

(v) 1 4

(vi) 5 13 30

(vii) 14 22 50

(viii) 23 25 70

(ix) 26 41

SC 2036

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SECTION A /

1. Name an element, other then carbon, which exhibits the property of catenation upto seven oreight atoms ? Are these compounds stable ?

2. The sky appears dark to passengers flying at very high altitudes. Why ?

3. State the role of decomposers in an ecosystem.

4. Which organism occupies the first trophic level in a food chain ?

5. The position of three elements X , Y and Z in the Periodic Table are shown below :(i) Which type of ion, cation or anion, will be formed by element X ?(ii) Which element, Y or Z, has the atom of comparatively larger size ?

Give reason in each case.

Group 1 Group 2

- -

X -

- -

Y Z

X , Y Z

(i) X

(ii) Y Z

1 2

- -

X -

- -Y Z

6. How does metallic characters of elements vary on moving from(i) left to right in a period,(ii) from top to bottom in a group ?

Give reasons for your answers.

(i) (ii)

7. Differentiate between vas deferens and Fallopian tube.

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8. Can termination of pregnancy be misused by people ? Justify your answer with reason.

9. Define absolute refractive index of a medium. Light enters from air to water having refractive

index 4/3. Find the speed of light in water. The speed of light in vacuum is 3108 m/s.4/3

3108 m/s

10. With the help of a diagram, explain the formation of a rainbow in the sky.

11. The following figure shows the defective eye of a person.

(i) Name the defect of vision he is suffering from. How can it be connected ?(ii) List two causes for this defect of vision.

(i)

(ii)

12. Why are forests considered biodiversity hot spots? What would happen due to loss ofbiodiversity ?

13. List two elements present in coal and petroleum besides carbon and hydrogen. What happenswhen combustion of coal and petroleum takes place in insufficient air (oxygen) ? State the gas

released and its consequences.

14. What is meant by hydrogenation ? With the help of chemical equation, explain the role of thisreaction in industry.

15. Three elements X,Y and Z have atomic numbers 7 , 10 and 14 respectively.(i) Identify the group number of these elements in the Periodic Table.

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(ii) Mention one unique feature each of elements Y and Z.(iii) Which two of the above elements belong to the same period ?

X,Y Z 7, 10 14

(i)

(ii) Y Z

(iii)

16. Explain the followings :(a) Testes and Ovaries are considered as the primary sex organs.(b) Advantage of seed production in plant(c) Vas deferens is long in human male.

(a)

(b)

(c)

17. Show inheritance of two characters over two generations by making a cross between round andyellow seeded plant (RRYY) with wrinkled and green seeded plant(rryy).

(RRYY) (rryy)

18. Explain the term :(a) Geographical isolation(b) Genetic drift

(c) Natural selection

(a)

(b)

(c)

19. (a) Which of the following fossils is invertebrate and which one vertebrate ?(i) Dinosaur (ii) Ammonite

(b) How can the age of fossil be ascertained ? State in brief any two methods.

(a)

(i) (ii)(b)

20. (i) List any two properties of the image formed by a plane mirror.(ii) The power of a spherical lens is 2D. State its nature and calculate its focal length in

centimeter.

(i)

(ii) 2D

21. (i) Define optical centre of a lens.(ii) In refraction of light through a rectangular glass slab, the emergent ray is parallel to the

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direction of the incident ray. Why ?(iii) What happens when a light ray is incident normally on one of the faces of a rectangular

glass slab ?

(i)

(ii)

(iii)

22. (i) What is meant by least distance of distinct vision ?(ii) How does iris controls the size of the pupil in bright light and dim light ?

(i)

(ii)

23. (i) When a compound X reacts with another compound Y in the presence of an acid

catalyst, a sweet smelling compound Z is produced. What are X and Y ? Write thechemical equation for this reaction.

(ii) What happens when the compound Z combine with an acid or a base ? Write the name

and chemical equation of the reaction.

(i) X Y

Z X Y

(ii) Z

OR/

(i) Distinguish between saturated and unsaturated hydrocarbons ? Which one of the two ismore reactive ?(ii) When do you get

(a) yellow sooty, (b) blue, flame in the burner ?(iii) Draw the structures for the following compounds :

(a) Cyclohexane (C6H12) (b) Propanoic acid (C2H5COOH)

(i)

(ii)

(a) (b)

(iii)

(a) (C6H12) (b) (C2H5COOH)

24. (a) Mention the changes which occur in the following female reproductive organs(i) Ovary and(ii) Uterus , during menstrual cycle.

(b) Explain the role of placenta.

(a)

(i) (ii)

(b)

OR/

(a) What is meant by reproduction. State its importance.(b) Draw a neat diagram of carpel showing germination of pollen on stigma. Label.

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(i) Male germ cell (ii) Pollen tube (iii) Ovary(iii) Female germ cell (iv) Pollen grain (iv) stigma

(a)

(b)

(i) (ii) (iii)(iii) (iv) (iv)

25. (i) Draw a ray diagram in each of the following cases. Also mark the angle of incidence (i)and angle of reflection in the diagram.(a) A ray passing through the principal focus of a convex mirror.(b) A ray incident obliquely to the principal axis towards the pole of a concave

mirror.(ii) An object, 2.0cm in size, is placed 20.0cm in front of a concave mirror of focal length

15.0cm. At what distance from the mirror should a screen be placed in order to obtain asharp image ? Find the nature and the size of the image formed.

(i) (i)

(r)

(a)

(b)

(ii) 2.0 cm 15.0 cm 20.0 cm

OR/

(i) Draw the ray diagrams in each of the following cases to show the position and nature ofthe image formed when the object is placed :(a) at 2F of a converging lens.(b) between the focus and optical centre of a converging lens.

(ii) The magnification produced by a spherical lens is1

3. If the image is formed at a distance

of 10cm from the lens, find the position of object. Also find the nature and focal length ofthis lens.

(i)

(a) 2F(b)

(ii)1

3 10 cm

SECTION B /

26. A colourless solution is kept in a test tube. This solution could be(a) Ferrous sulphate (b) Copper sulphate

(c) Aluminium sulphate (d) potassium permanganate

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(a) (b)

(c) (d)

27. When zinc metal is dipped in CuSO4 solution it is observed that(a) No reaction takes place.(b) The solution becomes green and copper gets deposited on the zinc metal.

(c) The solution remains blue and copper gets deposited on the zinc metal.(d) The solution becomes colourless and reddish brown coating gets deposited on the zinc

metal.

CuSO4

(a)

(b)

(c)

(d)

28. The odour of acetic acid is similar to that of(a) ethanol (b) orange (c) vinegar (d) burning sulphur

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

29. Sonia dipped a strip of red litmus paper into a test tube containing acetic acid. She observedthat the colour of litmus paper(a) changed to blue (b) remains red(c) becomes green (d) disappears

(a) (b)

(c) (d)

30. In the given experimental set up, a gas is evolved which turns lime water milky. The compoundX is :

(a) Sodium bicarbonate (b) Sodium hydroxide(c) Sodium acetate (d) Ethanol

X

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(a) (b)

(c) (d)

31. A student before determining the focal length of a concave mirror sees his face in the mirror andmeasures the distance between the mirror and his face as d . He then focuses a distant tree on ascreen and measures the distance between the screen and the mirror as x. Which one of thefollowing option is correct ?(a) x > d

(b) x < d(c) x = d(d) x can be greater than or less than d, depending on the distance of the tree from the

mirror.

d x

(a) x > d(b) x < d(c) x = d

(d) x d

32. The given figure shows the experimental set up of determination of focal length of a convexlens. Where should the screen be placed to obtain a clear image, if the focal length of the lens is5.8 cm ?

(a) 15.0cm (b) 10.2 cm (c) 9.6cm (d) 9.2cm

5.8 cm

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(a) 15.0cm (b) 10.2 cm (c) 9.6cm (d) 9.2cm

33. A student uses two convex lens, one is thicker and other is thinner, to obtain a sharp image of adistant tree. After getting the clear image on the screen by using both lenses, he is most likely toobserve that the distance between the lens and the screen is __________ .(a) greater in thicker lens (b) greater in thinner lens(c) same in both lenses (d) independent of thickness of lens.

(a) (b)

(c) (d)

34. Which one of the following precautions need to be modified in an experiment on tracing thepath of a ray of light passing through a rectangular glass slab for different angles of incidence.(a) The boundary of glass slab should be marked correctly.(b) The pins should be fixed correctly and the distance between them on either side of glass

slab should be about 2cm.(c) While seeing the images of pins, the feet of the pins should be along same straight line.(d) The angle of incidence should lie between 30 and 60.

.

(a)

(b) 2 cm

(c)

(d) 30 60

35. A student traces the path of a ray of light passing through a rectangular glass slab.

The correct position of the protractor (D) to measure the angle of emergence is shown in figure :(a) A (b) B (c) C (d) D

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

36. The following figures illustrate binary fission in Amoeba :

Select the option giving the correct sequence.

(a) I, II, IV, III (b) II, I, IV, III (c) II, III, I, IV (d) II, IV, I, III

(a) I, II, IV, III (b) II, I, IV, III (c) II, III, I, IV (d) II, IV, I, III

37. Out of the following diagrams select the one which depicts a stage in binary fission in amoeba.

(a) I (b) II (c) III (d) IV


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38. Following diagrams were drawn by four student on having seen a prepared slides of budding inyeast

The correct diagram(s) is / are(a) I and II, (b) III (c) I and III (d) II and IV

(a) I and II, (b) III (c) I and III (d) II and IV

39. Out of the following diagrams, the correctly labelled diagram showing budding in yeast is



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40. While performing the experiment with raisins to determine the percentage of water absorbed bythem a student noted following observation(1) volume of water taken in the beaker = 60 mL(2) mass of dry raisins = 4.2 g(3) mass of raisins after soaking water for 1 hour = 6.3g(4) volume of water left in the beaker after the experiment = 55 mL

The percentage of water observed by raisins is(a) 8.25% (b) 16.5% (c) 33.3% (d) 50%

(1) = 60 mL

(2) = 4.2 g

(3) 1 = 6.3g

(4) = 55 mL

(a) 8.25% (b) 16.5% (c) 33.3% (d) 50%

41. To determine the percentage of water absorbed by raisins, before final weighing of raisins afterbeing kept in water for about one hour, we remove extra water from the surface of soakedraisins by(a) dry cloth (b) filter paper (c) dry cotton wool (d) hot air

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

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2036 SC QP