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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

SC 1080

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SECTION – A /

1. State the law of constant proportion.

2. Which division among plants has simplest organisms ?

3. What is green house effect ?

4. What is notochord ? Write its functions.

5. If you go to the hospital to meet your friend suffering from malaria, what are the chances of

malaria spreading to you and your friends ?

6. (a) An object of volume V is immersed in a liquid of density P. Calculate the magnitude

of buoyant force acting on the object due to the liquid. (b) Mention the direction of buoyant force.

(a) V P

(b)

7. (a) State the factors on which work done on an object depends.

(b) Write the expression for work done when a constant force F applied on an object displaces the object through a distance S in the direction of force.

(a)

(b) F S

8. (a) Calculate the mass of 0.72 g molecule of CO

2.

(At mass of C12 u, O16 u)

(b) Calculate the number of moles of iron in iron sheet containing 1022 atoms of iron.

(a) CO2

0.72

C12 u , O16 u

(b) 1022

9. (a) If an atom contains one electron and one proton Will it carry any charge or not ? (b) On the basis of Thomson’s model of an atom explain how the atom is electrically neutral.

(a)

(b)

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10. (a) If the K and L shells of an atom are full then what would be the number of electrons in

the atom ? (b) Helium atom has atomic mass of 4u and has 2 protons in its nucleus. How many neutrons does it have ? (c) Why are isotopes of an element chemically similar ?

(a) K L

(b) 4u 2

(c)

11. Write four characteristics of Monerans. Blue green algae have been included under the

kingdom monera not under plantae. Why ?

12. You are given Leech, Neries, Prawn and Scorpion; and all have segmented body

organizations. Will you classify them in one group ? If not, give the important characters based on which you will separate these organisms into different groups.

13. (a) While going abroad why is it essential to get vaccinated against certain diseases ?

(b) Name a vaccine which saves the life of babies from three diseases. (c) A person is suffering from chest pain, breathlessness, loss of body weight, persistent cough and produces blood stained sputum ? Name the disease.

(a)

(b)

(c)

14. What is meant by relative density of a substance ? What is its Significance ? The relative

density of mercury is 13.6. What is its density in SI unit ? (Density of water1000 kg/m3)

13.6 SI

1000 kg/m3

15. The Kinetic energy of a cat running with a velocity of 10 m/s is 500 J. Find the Kinetic energy

of the cat. (i) If its velocity is doubled and (ii) if its velocity is increased three times

10 m/s 500 J

(i) (ii)

16. The power of a motor pump is 5 KW. How much water per minute the pump can raise to a

height of 20 m ? (g10 m/s2)

5 KW 20 m (g10 m/s2)

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17. Give reasons for the following :

(a) The reverberation time of a hall used for speeches should be very short. (b) A vibrating body produces sound. However no sound is heard when a simple pendulum oscillates in air. (c) Sounds of same loudness and pitch but produced by different musical instruments like a violin and flute are distinguishable.

(a)

(b)

(c)

18. (a) What are two different states in which water is formed during the water cycle ?

(b) What is the major source of fresh water in the city/town/village where you live ? (c) Do you know of any activity which may be polluting this water source ?

(a)

(b) / /

(c)

19. What is ozone hole ? Where is it found ? What is its effect ?

20. (a) Write the chemical formulae of the following compounds :

(i) Zinc sulphate (ii) Magnesium chloride (b) When 3.0 g of carbon is burnt in 8.0 g of oxygen 11.0 g of CO

2 is formed. What mass

of carbon dioxide will be formed, when 3.0 g of carbon is burnt in 50.0 g of oxygen. Which law of chemical combination will govern your answer ? State the law.

(a)

(i) (ii)

(b) 3.0 g 8.0 g 11.0 g 3.0 g

50.0 g

OR/

(a) Which of the following has more number of atoms ? (i) 10 g Nitrogen (N

2) gas

(ii) 10 g Ammonia (NH3) gas

(b) A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.

(a)

(i) 10 (N2)

(ii) 10 (NH3)

(b) 0.24 g 0.096 g

0.144 g

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21. (a) Identify the organism. Name the Phylum to which this organism belongs. Write any

two characteristic features of the phylum.

(b) Pick up the odd one out and justify your choice by giving reasons. Crocodile, salamander, sparrow, bat (c) Write the common name for Ascaris, Wuchereria

(a)

(b)

(c)

OR/

(a) Explain the three basic features for grouping all organisms into five major kingdoms. (b) Euglena is a dual organism. Why ?

(a)

(b) (dual)

22. State the Law of conservation of energy. Show that the energy of a freely falling body is

conserved.

OR/

(a) Define the term energy. (b) List the different forms of energy. (c) Show that work done by a force on an object is equal to the change in Kinetic energy of the object.

(a)

(b)

(c)

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23. A sound wave travelling in a medium is represented as shown in figure

(a) Which letter represents the amplitude of the sound wave ? (b) Which letter represents the wavelength of the wave ? (c) What is the frequency of the source of sound if the vibrating source sound makes 360 oscillations in 2 minutes ? (d) Calculate the time period of the source of sound.

(a)

(b)

(c) 2 360

(d)

OR/

(a) Draw a graph for a wave representing wave disturbance and time for a sound changing from low pitch to high pitch keeping amplitude of the sound same. (b) What happens to the medium through which sound travels ? (c) Name the physical quantity which determine the pitch of the sound. (d) A sound wave travels at a speed of 399 m/s. If its wave length is 1.5 m. What is the frequency of the wave ? Will it be audible to us’.

(a)

(b)

(c)

(d) 399 m/s 1.5 m

24. (a) A motor car with its glass totally closed is parked directly under the sun. The inside temperature of the car rises very high. Explain why ? (b) Why lichens do not occur in Delhi whereas they commonly grow in Manali or Darjeeling ? (c) How are root modules useful for the plants ?

(a)

(b)

(c)

OR/

How is soil formed ? What are the methods of preventing or reducing soil erosion ? Why is step farming common in hills ?

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SECTION - B /

25. A change in physical state of a substance can be brought about :

(a) only when energy is given to the substance. (b) only when energy is taken out from the substance. (c) When energy is either given to or taken out from the substance. (d) Without any energy change.

(a)

(b)

(c)

(d)

26. 16.8 g of sodium hydrogen carbonate is added to 12.0 g of acetic acid. The residue left

weighed 20.0 g. The mass of CO2 escaped in the reaction is

(a) 20.0 g (b) 8.8 g (c) 16.8 g (d) 36.8 g

12 16.8 20.0

CO2

(a) 20.0 (b) 8.8 (c) 16.8 (d) 36.8

27. The first segment in the body of earthworm is called :-

(a) Prostomium (b) Clitellium (c) Peristomium (d) Annuli

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

28. Parts of Agaricus labelled as A, B, C and D are

(a) Pileus, gills, stipe, hyphae (b) Pileus, hyphae, gills, stipe (c) Pileus, stipe, gills, hyphae (d) Pileus, gills, hypae, stipe

A, B, C D

(a) (b)

(c) (d)

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29. A student found the posterior part of a male cockroach in the laboratory. The following sketch was made. The missing part in the sketch is

(a) anal cerci (b) anal style (c) brood pouch (d) antennae

(a) (anal cerci) (b) (c) (d)

30. Chloroplast in spirogyra is

(a) spirally arranged without pyrenoids (b) spirally arranged in ribbon shape with pyrenoids (c) circular (d) cup shaped

(a)

(b)

(c)

(d)

31. Identify the dicots from the following sketches :-

(a) i and iii (b) ii and iii (c) i and iv (d) ii and iv

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

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32. At which stage of the life cycle of a mosquito is it best to eradicate mosquitoes (a) the egg stage (b) the larva stage (c) the pupa stage (d) the adult stage

(a) (b)

(c) (d)

33. The mass of a solid iron cube of side 4 cm is to be determined by using any four of spring

balances available. The one best suited for this purpose would have : (a) range0 to 100 g and least count1 g. (b) range0 to 100 g and least count5 g. (c) range0 to 1000 g and least count10 g. (d) range0 to 1000 g and least count25 g.

4 cm

(a) 0 100 1

(b) 0 100 5

(c) 0 1000 10

(d) 0 1000 25

34. The spring balance shown below is used to measure the mass of the given solid. The mass of

the solid is :-

(a) 115 g (b) 118 g (c) 120 g (d) 125 g

(a) 115 (b) 118 (c) 120 (d) 125

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35. The correct experimental setup for determining the mass of the solid in water is shown in figure :-

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

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

36. If a solid copper sphere is placed in water, the upthrust acting on it will be

(a) greater than the weight of the sphere (b) equal to the weight of the sphere (c) lesser than the weight of the sphere (d) none of these

(a) (b)

(c) (d)

37. The graph obtained between pressure and force by keeping area constant is

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

(P) (F)

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

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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 of dimensions 12 cm6 cm3 cm (ii) aluminium cuboid of dimension 12 cm6 cm3 cm (iii) coarse sand in a tray (iv) very 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

(i) 12 cm6 cm3 cm

(ii) 12 cm6 cm3 cm

(iii)

(iv)

(a) (b)

(c) (d)

39. If we place the porous surface at the back of the hollow tubes in the experimental setup of

reflection of sound then (a) Sound will be heard with greater intensity than the incident sound. (b) Sound will be heard with lesser intensity than the incident sound. (c) No reflection of sound takes place. (d) Reflected sound will remain same as incident sound.

(a)

(b)

(c)

(d)

40. A laboratory has the following apparatus available in it

(A) Two thin hollow wooden tubes. (B) An intense and broad source of sound. (C) An intense pointed source of sound. (D) A sharp pointed detector of sound. (E) A well polished metal sheet. (F) A white painted thermocol sheet. A student can do his experiment for verifying the laws of reflection of sound successfully by choosing the apparatus labelled as : (a) A, C, D, E (b) A, C, E (c) A, B, D, E (d) A, C, D

(A) (B)

(C) (D)

(E) (F)

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(a) A, C, D, E (b) A, C, E (c) A, B, D, E (d) A, C, D 41. A pulse was created in a string/slinky of length 4 m by a group of 4 students. They observed

that it returned after reflection, at the point of creation 6 times in 10 seconds and calculated the speed as follows :

Student A B C D

Speed in m/s 0.4 2.4 4.8 9.6

The correct speed was calculated by the student (a) A (b) B (c) C (d) D

4 m

10 6

A B C D

m/s 0.4 2.4 4.8 9.6

(a) A (b) B (c) C (d) D 42. The figure given below shows an incident pulse P reflected from a rigid support. Which out

of A, B, C, D represent the reflected pulse correctly.

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

P

A, B, C, D

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

- o O o -

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