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SUMMATIVE ASSESSMENT II, 2012

II, 2012

SCIENCE /

Class IX / IX

Time allowed : 3 hours Maximum Marks : 90

3 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 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 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.

(i)

(ii)

(iii)

(iv)

(v) 1 3

(vi) 4 7 30

(vii) 8 19 50

(viii) 20 24 70

(ix) 25 42

47004

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SECTION-A /

1. Write the atomicity of the following molecules.

(i) H2SO4 (ii) CCl4

(i) H2SO4 (ii) CCl4

1

2. Name the phylum to which Leech and Earthworm belong.

1

3. What is ozone hole ?

?

1

4. State the type of body cavity found in platyhelminthes. Write whether they are parasitic or

free living.

2

5. Explain how individual health depends on social and mental well being.

2

6. Why do buildings have wide foundations ?

2

7. Write the form of energy possessed by the body in the following situations :

(a) a coconut falling from tree. (b) an object raised to a certain height (c) blowing wind (d) A child driving a bicycle on road.

(a)

(b)

(c)

(d)

2

8. A 0.24 g sample of a compound of oxygen and Boron was found by analysis to contain

0.096 g of boron and 0.144 g of oxygen.

(i) Calculate the percentage composition of the compound by weight.

(ii) Find the number of moles in 0.144 g of oxygen gas

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(atomic mass oxygen 16.0u)

0.24 g 0.096 g

0.144 g

(i)

(ii) 0.144 g

9. An element

24

12X loses two electrons to form a cation which combines with the anion of

element 35

17Y formed by gaining an electron.

(i) Write the electronic configuration of element X (ii) Write the electronic configuration of the anion of element Y. (iii) Write the formula of the compound formed by the combination of X and Y.

24

12X

35

17Y

(i) X

(ii) Y

(iii) X Y

3

10. (i) Write the postulates of Bohr model of atom.

(ii) Draw a sketch of Bohr model of an atom with atomic number 15.

(i)

(ii) 15

3

11. State reasons for the following :

(a) Mammals have mammary glands.

(b) Annelids have a true body cavity.

(c) Fish possess gills.

(a)

(b)

(c)

3

12. Write one point of difference each between the following :

(a) Porifera and Coelenterata

(b) Gymnosperms and Angiosperms

(c) Birds and Reptiles

(a)

(b)

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(c)

13. (a) State the principle of Immunisation. Name two diseases for which vaccine is

available. (b) Mention two basic principles of prevention of infectious diseases.

(a)

(b)

3

14. (a) Do all bodies immersed in a given fluid experience the same buoyant force ?

Explain.

(b) A 100 cm3 block has a mass of 395g. Find its relative density.

(Density of water)1 g/cm3

(a)

(b) 100 cm3 395g

1 g/cm3

3

15. Mention the commercial unit of energy. Express it in terms of Joules. Calculate the energy

in Joule consumed by a device of 60 W in 1 hour.

60 W 1

3

16. Study the figure given and answer the following questions :

(a) What is the potential energy of the object of mass (m) at point B and C when it is

raised from point A to B and B to C. (b) Calculate the potential energy of the object when raised directly from point A to C. (c) Calculate whether same amount of work done against gravity in each case.

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Write your inference.

(a) m A B B C B C

(b) A C

(c)

17. Study the figure shown below and answer the following questions.

(i) Name the technique depicted in the figure.

(ii) What is the principle of this technique

(iii) List its two applications.

(i)

(ii)

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(iii)

18. Explain the occurrence of land breeze in coastal areas.

3

19. What is soil erosion ? Write any two methods of preventing soil erosion.

?

3

20. (a) Write the chemical formulae of

(i) Silver nitrate (ii) Magnesium sulphate (iii) Potassium carbonate (iv) Barium chloride (v) Sodium phosphate (vi) Sulphur dioxide (b) Define Avogadros Number. Convert 2 moles of Magnesium Sulphate sample into number of molecules present in the sample.

(a)

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(b) 2

5

OR/

(a) Write the chemical formulae of : (i) Aluminium Chloride (ii) Potassium Oxide (iii) Hydrogen sulphide (iv) Hydrogen chloride

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(v) Calcium carbonate (vi) Sodium chloride (b) Write any two postulates of Daltons atomic theory.

(a)

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(b)

21. (a) State two characteristic features of group Mollusca.

(b) Identify the organisms on the basis of the following features :

(i) A Reptile with four chambered heart

(ii) An Egg laying mammal

(iii) An Autotrophic Moneran

(a)

(b)

(i)

(ii)

(iii)

5

OR/

(a) Identify the kingdoms on the basis of the following features :

(i) Unicellular eukaryotic organisms

(ii) Heterotrophic eukaryotic organisms

(iii) Multicellular eukaryotic autotrophic organisms

(b) Give two characteristic features of the sub-phylum protochordata :

(a)

(i)

(ii)

(iii)

(b)

22. (a) Give one example each for positive and negative work done by a force.

(b) What is the work done to increase the velocity of a car from 30 km/h1 to

60 kmh1 if the mass of the car is 1500 kg ?

(a)

(b) 1500 kg 30kmh1 60 kmh1

5

OR /

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(a) Power of an electrical machine is rated at 2 KWh. What does it mean ? (b) Two girls, each of weight 400 N climb up a rope through a height of 8 m. We name one of the girls A and the other B. Girl A takes 20 s while B takes 50 s to accomplish this task. What is the power of each girl ?

(a) 2 Kwh.

(b) A B 400 N 8 m

20 s B 50 s

23. State laws of reflection of sound. Explain three applications based on these laws.

5

OR

(i) Explain why are sound waves called mechanical waves ?

(ii) Derive this relationship between the wavelength of a sound wave and its frequency with its speed.

(iii) In which medium the speed of sound will be greater air or water ? Give reason for your answer.

(i)

(ii)

(iii)

24. (a) Explain two ways in which nitrogen from the atmosphere is converted into a usable

form.

(b) (a) (b)

Give a schematic representation of the Carbon cycle, Label the main processes involved in it.

OR/ (a) What is acid rain ? Name the two gases which cause acid rain.

(b) List any two harmful effects of air pollution.

(a) ?

(b)

5

SECTION - B /

25. To verify the law of conservation of mass in a chemical reaction, four students A, B, C and

D performed the following chemical reactions. A : Heated crystals of lead nitrate(s) in a test tube B : Added quick lime to water.

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C : Dipped magnesium ribbon in copper sulphate solution. D : Added barium chloride solution to sodium sulphate solution. The student who is likely to get the best result is : (a) A (b) B (c) C (d) D

A, B, C

D

A : (s)

B :

C :

D :

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

26. A student mixed 53.5 g of copper sulphate solution with an unknown mass of a solution of

sodium carbonate. The total mass of the solutions after the reaction between the two chemicals was found to be 111.5 g. Assuming that the experiment was conducted without any error, the initial mass of sodium sulphate should be (a) 53.5g (b) 58.0g (c) 111.5g (d) 165.0 g

53.5

111.5 g

(a) 53.5g (b) 58.0g (c) 111.5g (d) 165.0 g

1

27. In the body of earthworm both male and female sex organs are present in the same

organism. It is thus :

(a) Hermaphrodite (b) Oviparous

(c) Unisexual (d) Viviparous

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

1

28. Which of the following represents a moss plant body ?

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

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

29. The incorrect statement with reference to Cockroach is :

(a) It has three pairs of legs.

(b) It has three pairs of wings.

(c) Body is divided into head, thorax and abdomen.

(d) Chitinous exoskeleton.

: (a) (b) (c) , , (d)

1

30. Which of the following is not an Angiospermic plant ?

(a) mustard (b) brinjal (c) coconut (d) pinus

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

1

31. Four students A, B, C and D are observing the seeds and flowers of gram plant. They

reported their observations that the gram plant has :

(A) dicotyledonous seeds and trimerous flowers.

(B) dicotyledonous seeds and pentamerous flowers.

(C) monocotyledonous seeds and trimerous flowers.

(D) monocotyledonous seeds and pentamerous flowers.

The student whose report is correct is :

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

A, B, C D

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(A)

(B)

(C)

(D)

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

32. A student was observing the developmental stages in the life cycle of a mosquito. He

observed that the stage in which it appears like a worm is of :

(a) egg (b) larva (c) pupa (d) adult

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

1

33. Before suspending a stone of mass 100g, the spring balance showed a reading of 2g. What

will be the reading after the stone is suspended ?

(a) 98g (b) 99g (c) 100g (d) 102g

100g 2g

(a) 98g (b) 99g (c) 100g (d) 102g

1

34. The mass of a solid object in air is 140g while its mass when fully immersed in water is

105g. Which of the following statement is correct about the object ?

(a) The volume of the object is 105 cm3

(b) The density of the object is 4g/cm3

(c) The buyant force acting on the object in water is 105 N.

(d) The density of the object is 0.25g/cm3.

140g 105g

(a) 105 cm3

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(b) 4g/cm3

(c) 105 N

(d) 0.25g/cm3

35. In an experiment to establish the relationship between loss in weight of solid when

immersed fully in a given liquid with the weight of water displaced by it, the volume of the displaced water gives us :- (a) volume of the object (b) mass of the object (c) weight of the object (d) all of these

(a) (b)

(c) (d)

1

36. On immersing a body fully in a liquid, the apparent loss in weight will be :-

(a) more in denser liquid (b) independent of the density of the liquid (c) less in a denser liquid (d) more in a lighter liquid

(a) (b)

(c) (d)

1

37. An iron cuboid of dimension 10 cm 5 cm 2 cm when placed on a bed of sand will

depress the sand bed the most when it is made to lie on the face having dimensions : (a) 10 cm 2 cm (b) 10 cm 5 cm (c) 5 cm 2 cm (d) The depression will be same for all surface.

10 cm 5 cm 2 cm

(a) 10 cm 2 cm (b) 10 cm 5 cm

(c) 5 cm 2 cm (d)

1

38. To observe and compare the pressure exerted by the three faces of a cuboid on sand, the

following apparatus is available in the laboratory : (i) iron cuboid (ii) aluminum cuboid of same dimension (iii) coarse sand in a tray (iv) fine sand in a tray The best choice would be : (a) iron cuboid and coarse sand (b) aluminium cuboid and coarse sand (c) iron cuboid and fine sand (d) aluminium cuboid and fine sand

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(i)

(ii)

(iii)

(iv)

(a) (b)

(c) (d)

39. In the experiment on verifying the laws of reflection of sound the tube facing the clock is at

an angle of 40 with the reflecting surface, the position of second tube at which ear will get the best reflected sound is obtained when the angle at which it is placed to reflecting surface is :

(a) 30 (b) 40 (c) 50 (d) 20

40

'x'

(a) 30 (b) 40 (c) 50 (d) 20

1

40. A laboratory had the following apparatus available in it

(i) Two thin hollow wooden tubes (ii) An intense and broad source of sound (iii) An intense and pointed source of sound (iv) A sharp pointed detector of sound (v) A well polished metal sheet (vi) A white painted thermocol sheet Experiment on verifying the laws of reflection of sound can be done successfully by choosing the apparatus labeled as : (a) (i), (iii), (iv), (v) (b) (i), (iii), (v) (c) (i), (ii), (iv), (v) (d) (i), (iii), (iv)

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(a) (i), (iii), (iv), (v) (b) (i), (iii), (v) (c) (i), (ii), (iv), (v) (d) (i), (iii), (iv)

1

41. While performing experiment to determine the velocity of pulse through slinky, four

students, A, B, C, D did it by stretching the slinky given to each of them to 4m, 10m, 3.5m, 2.8m respectively. The student who is likely to get most correct result is

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

A, B, C, D

4m, 10m, 3.5m 2.8m

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

42. In performing the experiment to measure velocity of pulse in a slinky, Mita stretched the

slinky to 4.5m length. Time taken by the pulse making 5 journeys from one end to the other is 5s. The speed of pulse measured by her would be

(a) 0.9 ms1 (b) 1 ms1 (c) 3.6 ms1 (d) 4.5 ms1

4.5m

5s

(a) 0.9 ms1 (b) 1 ms1 (c) 3.6 ms1 (d) 4.5 ms1

1