Science

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Science ! Back to listing page Paper: CBSE Sample paper 5 (Silver series) - IX - Science -SA II Total marks of the paper: 90 Total time of the paper: 3 Hrs Test instructions:General Instructions: i) The question paper comprises of two sections, A (Question No. 1 to 24)and B (Question No. 25 to 42), 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 numbers1 to 3 in section A are one mark question. These are to be answered in one word or one sentence. vi) Questions numbers 4 to 7 are two marks questions, to be answered in about 30 words. vii) Question numbers 8 to 19 are three marks questions, to be answered in about 50 words. viii) Question numbers 20 to 24 are five marks questions, to be answered in about 70 marks. ix) Question numbers 25 to 42 in section B are multiple choice questions are based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you. Questions: 1] Is potential energy a vector or a scalar quantity? [Marks :1] 2] State the law of constant proportions? [Marks :1] 3] Write any two methods of preventing soil erosion. [Marks :1]

Transcript of Science

Science

! Back to listing page

Paper: CBSE Sample paper 5 (Silver series) - IX - Science -SA II

Total marks of the paper:

90

Total time of the paper:

3 Hrs

Test instructions:General Instructions:i) The question paper comprises of two sections, A (Question No. 1 to 24)and B (Question No. 25 to 42), 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 numbers1 to 3 in section A are one mark question. These are to be answered in one word or one sentence.vi) Questions numbers 4 to 7 are two marks questions, to be answered in about 30 words.vii) Question numbers 8 to 19 are three marks questions, to be answered in about 50 words.viii) Question numbers 20 to 24 are five marks questions, to be answered in about 70 marks.ix) Question numbers 25 to 42 in section B are multiple choice questions are based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you.

Questions:

1] Is potential energy a vector or a scalar quantity? [Marks:1]

2] State the law of constant proportions? [Marks:1]

3] Write any two methods of preventing soil erosion. [Marks:1]

4] (i) Give any two examples of longitudinal waves.(ii) What is the most essential property of a wave motion and why?

[Marks:2]

5] (a) Which phylum of kingdom animalia has spiny body? Give one example of it.(b) Write the name of the class to which the following belongs:(i) Sea horse.(ii) King cobra.

[Marks:2]

6] (a) Write two points of difference between amphibians and reptiles.(b) List two characters which help amphibians to survive on land.

[Marks:2]

7] (a) Name any two abiotic factors that make soil.(b) What would happen if all the oxygen present in the environment is converted to ozone?

[Marks:2]

8] (a) Calculate the work done in lifting 200 kg of water through a vertical height 6 meter. (Assuming g = 10m/s2)(b) When an object moves on a circular path, what is the work done?

[Marks:3]

9] (a) Define frequency and wavelength in reference to sound.(b) What is echo? Give formula for time of echo.

[Marks:3]

10] (a) Establish a relation between wavelength, frequency and speed of sound in a medium.(b) Give two examples of transverse waves.

[Marks:3]

11] Which would have greater effect on the kinetic energy of an object, doubling the mass or doubling the velocity?

[Marks:3]

12] What is the loudness of sound? On what factors do it depends? [Marks:3]

13] (i) Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?(ii) Name the term used for the symbolic representation of a molecule of an element or a compound? Give an example of it.

[Marks:3]

14] (a) What is the mass of?(i) 0.2 mole of oxygen atoms?(ii) 0.5 mole of water molecules?(b) Name the two types of radicals.

[Marks:3]

15] (i) On the basis of Thomson's model of an atom, explain how the atom is neutral as a whole?(ii) Where are electrons found in the atom?(iii) What is the atomic number of an atom with 7 proton, 8 neutrons and 7 electrons?

[Marks:3]

16] (a) What are lichens? Give two examples and one use of it?(b) Name the excretory organs of following:(i) Cockroach(ii) Leech

[Marks:3]

17] (a) What are the two ways to treat an infectious disease?(b) Name any two sexually transmitted diseases.

[Marks:3]

18] (a) How air borne transmitted diseases like common cold spreads?(b) What do we call such microorganisms that cause diseases? Give one example also.

[Marks:3]

19] (a) Why antibiotics do not work against viruses?(b) (i) Name any two diseases which have long term effect on the health of an individual.(ii) What is immunity?

[Marks:3]

20] (a) Calculate the power of an engine which can lift 200 Kg of water to store in a tank at a height of 10 m in 4.9 s. Also express in horse power. (given = 9.8 m/s2.(b) What type of energy is stored in the spring of a watch?(c) What is the work done by the tension in the string of a sample pendulum?Or(a) What happens to the kinetic energy when:(i) The mass of the body is doubled at constant velocity?(ii) The velocity of the body is doubled at constant mass?(iii) The mass of the body is doubled but the velocity is reduced to half?(b) Two bodies of equal masses move with the uniform velocities v and 3v respectively. Find the ratio of their kinetic energies.

[Marks:5]

21] (a) State Archimedes' principle. Mention a few applications of Archimedes' principle.  (b) Why railway tracks are laid on large sized wooden sleepers?Or(a) Give relation between velocity, wavelength and frequency.

[Marks:5]

(b) A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

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[Marks:5]

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[Marks:5]

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[Marks:5]

25] Waves propagate well in [Marks:1]

A. Unloaded slinkyB. Equally in (a) and (b)C. None of theseD. Loaded slinky

26] What type of surface is needed for the reflection of sound waves? [Marks:1]

A. Smooth surface only.B. Polished and smooth surface.C. Polished and rough surface.D. Hard surface only.

27] SI unit of pressure is [Marks:1]

A. Newton

B. Newton m2

C. Pascal m2

D. Newton/m2

28] The measuring range of a measuring cylinder is 25 ml. If its least count is ½ ml, then the space between 5 ml and 10 ml mark should be divided into

[Marks:1]

A. 25 equal partsB. 5 equal partsC. 2 equal partsD. 10 equal parts

29] The sea water is denser than fresh water due to [Marks:1]

A. EvaporationB. Mixing of sandC. StagnationD. Mixing of salts

30] Apparent loss in weight is caused due to [Marks:1]

A. Decrease in mass.B. Decrease in volume.C. Decrease in density.

D.Upward thrust exerted by the liquid.

31] A nail sinks in the sea water but a much heavier ship floats on it because [Marks:1]

A. Density of sea water is very high.B. Ship is not too heavy.

C.The uplift acting on ship is very small compared to the weight of the ship.

D.The weight of the water displaced by the ship is more than that of the ship.

32] A body is weighed using a spring balance. It will show the weight of the body at your place to be

[Marks:1]

A. Equal to that at the poles.B. Less than that at the equator.C. More than that at the poles.D. More than at the equator.

33] What is the colour of the precipitate that gets formed in the experiment carried out for the verification of the law of conservation of mass?

[Marks:1]

A. GreenB. BlueC. YellowD. White

34] What is the correct statement of the 'Law of Conservation of Mass'? [Marks:1]

A.The elements are always present in a constant proportion in a chemical substance.

B.

If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.

C.The rate of reaciton is directly proportional to the active mass of the reactants.

D.That mass can neither be created nor be destroyed.

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[Marks:1]

A. UlothrixB. ChlamydomonasC. CladophoraD. Spirogyra

36] Which of the following is the characteristic feature of ferns? [Marks:1]

A. They have male and female cones.B. They have rhizoids.C. They have needle shaped leaves.

D.Their plant body is differentiated into root, stem and leaves.

37] Choose the option which includes the feature that helps the fish to change its direction.

[Marks:1]

A. Caudal fin and pelvic finB. Dorsal fin and anal finC. Dorsal fin onlyD. Caudal fin only

38] Pick the odd one out: [Marks:1]

A. Jointed legsB. Compound eyesC. WingsD. Scales

39] Which of the following is not an aerial adaptation of bird? [Marks:1]

A. Presence of strong flight muscles.B. Streamlined body.C. Forelimbs modified into wings.D. Presence of vertebral column.

40] Choose the option that best describes the feature of spirogyra. [Marks:1]

A.Multicellular, autotrophic, root like rhizoids

B.Cytoplasmic strands, autotrophic, presence of rhizome

C.Presence of male cones, nonvascular filaments

D.Filamentous, Presence of cytoplasmic strands, presence of pyrenoids

41] Identify the group of plants in which vascular tissues are present, but no seeds, [Marks:1]

A. BryophytaB. GymnospermC. AngiospermD. Pteridophyta

42]

[Marks:1]

A. Pointed headB. Bulky thoraxC. Presence of scalesD. post anal tail

Click here to view Solutions

Solutions:

1] Potential energy is a scalar quantity.2] Law of constant proportions: In a chemical substance, the elements are  always present in

definite proportions by mass.

3] (a) Grazing of animals should be prevented.(b) Prevention of deforestation and increase of forestation.

4] (i) Waves produced in air.(ii) When a freely suspended spring is pulled downwards and released, longitudinal waves are produced.(b) The most essential property of a wave motion is its frequency. Frequency of a wave is its inherent characteristic and does not change by the change in temperature, pressure or change in medium.

5] (a) The animals of phylum Echinodermata have spiny skinned body.Example - Asterias (star fish), Holothuria (Sea cucumber) (Any one)(b) (i) Sea horse - Pisces.(ii) King cobra - Reptilia.

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7] (a) (i) Sun(ii) Water(iii) Wind(Any two)(b) If all the oxygen present in the environment is converted to ozone then it would be difficult to breathe and survive and all the living forms would be killed.

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11] (i) As kinetic energy of an object is directly proportional to its mass, so if mass is doubled (i.e. it becomes 2 m), then kinetic energy will also get doubled.(ii) On the other hand, the kinetic energy of an object is directly proportional to the "square of its velocity" (v2).So, if the velocity is doubled (i.e. it becomes 2 v), then kinetic energy will become four times. This is because (2v)2 = 4v2.Hence, it is clear that doubling the velocity has a greater effect on the kinetic energy of an object.

12] The sensation of hearing, which enables us to distinguish between a loud and a soft sound is called loudness.The factors on which sound depends are:(i) Amplitude of vibration of the source producing the sound waves.(ii) Amplitude depends upon the force with which an object is made to vibrate.(iii) Loudness is also related to the intensity of sound.

13] (i) "Atoms are indivisible particles which can neither be created nor destroyed in a chemical reaction".(ii) Chemical formula.Example - Chemical formula of sodium carbonate is Na2CO3.

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15] (i) According to Thomson's model, an atom is made up of positively charged sphere in which electrons are embedded. The negative and positive charges are equal in magnitude. An atom has the same number of electrons and protons. This explains that the atom is neutral as a whole.(ii) Electrons revolve around the nucleus in certain fixed paths which are called orbits or shells having definite energy.(iii) Atomic number = Number of protons = 7.

16] (a) Lichens are a symbiotic combination between algae and fungi where both are

mutually benefited. It is used as pollution indicators. (b) (i) Cockroach - Malphigian tubules (ii) Leech - Nephridia

17] (a) The two ways to treat an infectious disease are:(i) To reduce the effects of the disease. (ii) To kill the cause of the disease. (b) Syphilis and AIDS.

18] (a) Air borne diseases occur through the little droplets thrown out by an infected person who sneezes or coughs.Someone standing closely can breathe in these droplets, and the microbes get a chance to start a new infection.(b) PathogensExample - bacteria, fungi, virus, protozoan(Any one)

19] (a) Viruses have different cell pathways as compared to bacteria. Thus, they cannot be killed by antibiotics.Viruses have few biochemical mechanisms of their own. They enter the host cell and use their machinery for their life processes.If we have to reduce the severity of the disease then we have to work against our body or the host cell.(b) (i) Diabetes and AIDS. (ii) The built in resistance of body for a disease is called immunity.

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25] Loaded slinky26] Hard surface only.27] Newton/m2

28] 10 equal parts29] Mixing of salts30] Upward thrust exerted by the liquid.31] The weight of the water displaced by the ship is more than that of the ship.32] More than at the equator.33] White34] That mass can neither be created nor be destroyed.35] Spirogyra36] Their plant body is differentiated into root, stem and leaves.37] Caudal fin only38] Scales39] Presence of vertebral column.40] Filamentous, Presence of cytoplasmic strands, presence of pyrenoids41] Pteridophyta42] post anal tail

CBSE Sample paper 4 (Silver series) - IX - Science -SA II

Total marks of the paper: 90

Total time of the paper: 3 Hrs

Test instructions:General Instructions:i) The question paper comprises of two sections, A (Question No. 1 to 24)and B (Question No. 25 to 42), 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 numbers1 to 3 in section A are one mark question. These are to be answered in one word or one sentence.vi) Questions numbers 4 to 7 are two marks questions, to be answered in about 30 words.vii) Question numbers 8 to 19 are three marks questions, to be answered in about 50 words.viii) Question numbers 20 to 24 are five marks questions, to be answered in about 70 marks.ix) Question numbers 25 to 42 in section B are multiple choice questions are based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you.

Questions:

1] When an object moves on a circular path, what is the work done? [Marks:1]

2] What do the following abbreviations stands for?(a) 2O(b) O2

[Marks:1]

3] What is the percentage of nitrogen and oxygen in the air? [Marks:1]

4] Give any two important applications of Archimedes' principle. [Marks:2]

5] (a) Identify any two features possessed by Chordates.(b) In which class would you place an organism which has:(i) A scaly exoskeleton and a bony endoskeleton.(ii) A scaly exoskeleton and lay eggs outside water.

[Marks:2]

6] (a) What is the advantage of classifying organisms? (b) Why some organisms are considered diploblastic?

[Marks:2]

7] What are the two types of natural resources? Define and give an example of each.

[Marks:2]

8] (a) A stone of mass 2 kg is falling from rest from the top of a steep hill. What will be its kinetic energy after 5 s?(b) Write an expression for the work done when a force is acting on an object in the direction of its displacement.

[Marks:3]

9] (a) Why is sound wave called a longitudinal wave?(b) A bat can hear sound at frequencies upto 120 kHz. Determine the wavelength of sound in air at this frequency. Take the speed of sound in air as 344 m/s.

[Marks:3]

10] (a) Give any two characteristics of wave motion.(b) Write any two examples of electromagnetic waves.

[Marks:3]

11] In which of the following cases will the work done by a force be maximum; when the angle between the direction of force and displacement is (i) zero or (ii) 90o?

[Marks:3]

12] Why sound waves are called mechanical waves? Why is a loud sound heard at resonance?

[Marks:3]

13] (a) Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas? (b)Write the molecular formula of a diatomic gas and a triatomic gas.

[Marks:3]

14] (a) How many grams of chlorine are contained in one mole of chlorine? (Gram atomic mass of Chlorine = 35.5 g)(b) How many molecules are there in 1 g of chlorine?

[Marks:3]

15] (a) Electron in an atom moves from K to L- shell. Will the energy be absorbed or evolved?(b) Give one achievement and one limitation of Thomson's model.

[Marks:3]

16] (a) State any two conditions essential for good health.(b) How are antibiotics effective in the treatment of some diseases?

[Marks:3]

17] (a) How cholera is spread through water? (b) Name the primary and secondary host of the pathogen that causes malaria.

[Marks:3]

18] (a) What do you mean by immunization?(b) List two disadvantages of treatment of a disease.

[Marks:3]

19] (a) What are fungi? Why are they referred to as saprophytes?(b) What is the function of cnidoblasts cells in Hydra?

[Marks:3]

20]

[Marks:5]

21] (a) What is buoyancy ? What is the condition for floatation?(b) What are the factors on which buoyant force depends?OrExplain with examples to illustrate that sound wave is produced by vibrating objects.

[Marks:5]

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[Marks:5]

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[Marks:5]

24] (a) Define the following terms:(i) Lichens(ii) Cryptogamae(iii) Phanerogams(b) Why whales are not grouped in the fishes?(c) What is bilateral symmetry?Or(a) Give reasons for the following:(i) Bryophytes are called amphibians of plant kingdom.(ii) From Phylum Platyhelminthes onwards, animals are categorized as 'triploblastic'.(iii) The presence of 'coelom' in an animal's body is considered as

[Marks:5]

advantageous.(b) What are oviparous animals?(c) Name the phylum in which pharyngeal gill slits are present.

25] In which of the following gases is the sound speeds maximum? [Marks:1]

A. AirB. Carbon-dioxideC. HeliumD. Hydrogen

26] In a spring balance the space between 0 and 25 g marks is divided into 10 equal parts. The least count of spring balance is:

[Marks:1]

A. 25 g wtB. 0 g wtC. 15 g wtD. 2.5 g wt

27] The common spring balance is used in science laboratories measures the weight of body suspended from its lower hook in:

[Marks:1]

A. Kg wtB. dynesC. newtonsD. g wt

28] Volume of a glass topper is 12.5 cm3 and its density is 2.4 g cm-3 . To weigh it we shall prefer a spring balance of range:

[Marks:1]

A. 25 gB. 250 gC. 1000 gD. 100 g

29] In a graduated measuring cylinder there are four additional marks between 0 ml and 5 ml marks. Using this measuring cylinder we can find volume to an accuracy of:

[Marks:1]

A. 4 mlB. 1/4 mlC. 1/5 mlD. 1 ml

30] Thrust exerted by an iron cuboid when placed on sand is equal to [Marks:1]

A. mass of cuboidB. weight per unit surface areaC. mass per unit surface areaD. weight of cuboid

31] S.I unit of pressure is [Marks:1]

A. N mB. N m2

C. N/m

D. N/m2

32] The linear distance between two consecutive centers of compressions in a sound wave is known as

[Marks:1]

A. AmplitudeB. FrequencyC. Wave velocityD. Wave length

33] In the experiment for the verification of law of conservation of mass, along with Barium chloride ,which of the following reagent can be used.

[Marks:1]

A. Sodium carbonateB. Sodium chlorideC. Copper sulphateD. Sodium sulphate

34] What is the chemical formula of the precipitate formed in the experiment? [Marks:1]

A. Na2SO4

B. BaCO3

C. BaCl2

D. BaSO4

35]

[Marks:1]

A. A bryophyteB. A pteridophyteC. A gymnospermD. An angiosperm

36] Earthworm has an unsegmented band called [Marks:1]

A. CephalothoraxB. ThoraxC. MetathoraxD. Clitellum

37] Which of the following belongs to thallophyta? [Marks:1]

A. PinusB. FernC. All of them

D. Spirogyra38] Cell wall of Agaricus is made up of: [Marks:1

]A. CelluloseB. Protein and fatC. LigninD. Chitin

39] Body of the bony fish does not show gills as they are covered by [Marks:1]

A. ScalesB. FinsC. SkinD. Operculum

40] The number of wings in cockroach is [Marks:1]

A. TwoB. SixC. NoneD. Four

41] Forelimbs in birds are: [Marks:1]

A. AbsentB. RudimentaryC. Only hind limbs are presentD. Modified into wings

42]

[Marks:1]

A. AB. BC. CD. D

Click here to view Solutions

Solutions:

1] Work done is zero, because displacement is perpendicular to the direction of force always.

2] (a) Two atoms of oxygen.(b) One molecule of oxygen.

3] (i) Nitrogen 78%(ii) Oxygen 21%

4] (i) It helps in designing motorboats, ships and submarines.(ii) Working of lactometer and hydrometer is based on Archimedes' principles

5] (a) (i) Presence of notochord or dorsal nerve chord.(ii) They are triploblastic and are coelomate.(b) (i) Class Pisces.(ii) Class Reptilia.

6] (a) There is very large number of organisms and it is very difficult to study them individually, so classification enables us to deal with enormous diversity of life in an arranged manner.(b) The body of some animals is made up of two layers of cells, one makes up the cells on the outside of the body and the other makes the inner linning of the body, so these animals are considered diploblastic.

7] The two types of natural resources are:(a) Exhaustible resources - The resources which take millions of years to be formed and are depleted at a faster rate due to consumption by human beings are called exhaustible resources. Examples - coal, petroleum. (Any one)(b) Inexhaustible resources - The resources which are recycled easily and can be replenished in a very short duration of time are called inexhaustible resources. These are present in unlimited quantity in nature.Examples - water, air (Any one)

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10] (a) Characteristics of wave motion.(i) Wave motion is a periodic disturbance which is produced by a vibrating object.(ii) In wave motion, due to disturbance the particles of the medium vibrates along with its mean position, but do not leave their position.

(b) Radio waves and light waves.11]

12] Sound waves are called mechanical waves because a material medium is required for propagation of sound.During resonance, the amplitude of the vibrating particles increases because a compression falls over a compression and a rarefaction falls over a rarefaction. As intensity of sound is directly proportional to the square of amplitude, maximum sound is heard.

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15] (a) The energy is absorbed.(b) Achievement of Thomson's model:It explained the electrical neutrality of the atom.Limitation of Thomson's model:It failed to explain how the positive and negative charges were arranged in an atom so close to each other.

16] (a) (i) Better social environment.(ii) Better public cleanliness.(b) Antibiotics block the biochemical pathways of bacteria due to which they are not able to make their cell walls and they die. This helps in curing bacterial diseases.

17] (a) The water borne diseases occur if the excreta from someone suffering from an infectious gut disease, such as cholera, get mixed with the drinking water used by people living near by. The cholera causing microbes will enter new hosts through the water they drink and cause disease in them. Such diseases are much likely to spread in the absence of safe supplies of drinking water.(b) (i) Primary host is Human being.(ii) Secondary host is Mosquito.

18] (a) Immunization is a process of inoculation of substance into a healthy person in order to develop immunity against the disease.(b) Disadvantages of principle of treatment.• A person gets bedridden due to which his or her work gets affected.• Person becomes source of infection for others also.

19] (a) (i) Fungi are hetrotrophic eukaryotic organisms.They use decaying organic material as food and are therefore, called saprophytes.(b) Cnidoblasts are the special stinging cells present on the tentacles of Hydra which helps in capturing its prey.

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21] (a) The tendency of a liquid or gas to push an object immersed in it upward with some force(called upthrust or buoyant force) is called buoyancy. An object floats on the surface of a liquid if the weight of the object is equal to buoyant force acting on it.Weight of object = Weight of liquid displaced by the immersed part of the object.(b) The buoyant force depends upon the following two factors:1. The volume of object immersed in fluid.2. The density of fluid in which the object is immersed.OrSound wave is a kind of energy which is produced due to vibrations. When the vibration stops, the sound also stops.This can be illustrated by the following examples:1. The sound in a sitar or guitar is produced by the vibrations of the stretched strings.2. The sound of a drum is produced by the vibrations of their skin or membranes when struck. 3. The sound of a flute is produced by the vibration of the air enclosed in the flute tube.

4. the sound in the radio or television is produced by the vibration of the thin cone of the speaker.5. When a bird flaps its wings, it produces vibrations in air and we hear sound.6. A stretched rubber band when plucked vibrates and produces sound.7. The underwater sound waves produced in submarines are produced by the vibrations in their propellers.8. the sound of our voice is produced by the vibrations of two vocal chords in our throat, caused by air coming from the lungs.(Any five)

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24] (a) (i) Lichens: Some fungal species live in permanent mutually dependent relationships with blue-green algae. Such relationships are called symbiotic and the symbiotic life forms are called lichens.(ii) Cryptogamae: The reproductive organs of the thallophytes, the bryophytes and the pteridophytes are very inconspicuous and are therefore, called 'cryptogamae'. It means the plants with 'hidden reproductive organs'.(iii) Phanerogams: The plants with well differentiated reproductive tissues that ultimately make seeds are called 'phanerogams'.(b) Whales can swim in water like the fishes but are not fish as they respire with lungs and have four chambered heart and mammary glands, so they are mammals.(c) When the body of an organism can be cut into two similar halves which are mirror image of each other, only by one plane then the organism is said to have bilateral symmetry.Or

(a) (i) Just like amphibians, bryophytes require water for fertilization as their gametes require aqueous medium for movement.(ii) There are three layers of cells from which differentiated tissues can be made. This allows inside and outside body linings as well as some organs to be made. There is thus some degree of tissue formation.(iii) Coelom is a true internal body cavity in which well-developed organs can be accommodated.(b) The animals which lay eggs are known as oviparous animals.(c) Chordata.

25] Hydrogen26] 2.5 g wt27] g wt28] 100 g29] 1 ml30] weight of cuboid31] N/m2

32] Wave length33] Sodium sulphate34] BaSO4

35] An angiosperm36] Clitellum37] Spirogyra38] Chitin39] Operculum40] Four41] Modified into wings42] D

CBSE Sample paper 3 (Silver series) - IX - Science -SA II

Total marks of the paper: 90

Total time of the paper: 3 Hrs

Test instructions:General Instructions:i) The question paper comprises of two sections, A (Question No. 1 to 24)and B (Question No. 25 to 42), 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 numbers1 to 3 in section A are one mark question. These are to be answered in one word or one sentence.vi) Questions numbers 4 to 7 are two marks questions, to be answered in about 30 words.vii) Question numbers 8 to 19 are three marks questions, to be answered in about 50 words.viii) Question numbers 20 to 24 are five marks questions, to be answered in about 70 marks.ix) Question numbers 25 to 42 in section B are multiple choice questions are based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you.

Questions:

1] A blacksmith uses a heavy hammer and brings it from a height before striking on the chisel. Why?

[Marks:1]

2] Give two examples of polyatomic ions? [Marks:1]

3] Name the two gases that comprise about 99% part of atmosphere. [Marks:1]

4] Explain the following:(a) Swimmers are provided with an inflated rubber jacket/tube. Why?(b) It is easier to swim in sea water than in river water. Why?

[Marks:2]

5] (a) How do gymnosperms and angiosperms differ from each other?(b) Name the largest phylum which is probably the largest group of animals?

[Marks:2]

6] (a) List any two uses of ground water.(b) How ozone layer is useful to us?

[Marks:2]

7] (a) Name the factors which influence the patterns of winds.(b) Name any two green house gases.

[Marks:2]

8] (a) Distinguish between longitudinal and transverse wave. Give one example each.(b) Write two important applications of ultra sound waves.

[Marks:3]

9] (a) Define potential energy and give few examples of objects possessing potential energy.(b) What is gravitational potential energy? How does the change in potential energy of an object between two given points depend?

[Marks:3]

10]

(a) A ship sends out ultrasound produced by transmitter that returns from the sea bed and detected after 3.42 s. If the speed of ultrasound waves through sea water is 1530 s-1, what is the distance of the sea bed from the ship?(b) What is SONAR?

[Marks:3]

11]

Define 1 joule of work. What is the relation between joule and erg? [Marks:3]

12]

A wave pulse on a string moves a distance of 8m in 0.05s.(a) Find the velocity of the pulse.(b) What would be the wavelength of the wave on the same string if its frequency is 200 Hz?

[Marks:3]

13]

(a) Write the electronic configuration of the elements whose atomic numbers are 5 and 7.(b) Why is an atom considered to be neutral?

[Marks:3]

14]

[Marks:3]

15]

Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur. (Given: Atomic mass of S = 16)

[Marks:3]

16]

(a) What is advantage of using scientific name instead of common name?(b) Write two points of differences between amphibians and aves.

[Marks:3]

17]

(a) Give suitable term for the following:(i) Animals carrying the infecting agents from a sick person to another potential host.(ii) Preventive inoculation against a disease.(b) Write the full form of AIDS. Name the virus that caused AIDS.

[Marks:3]

18]

(a) What is the binomial system of nomenclature?(b) Mention any two characteristic feature of phylum Echinodermata?

[Marks:3]

19]

(a) Under which of the following conditions is a person most likely to fall sick?(i) When she is recovering from malaria.(ii) When she has recovered from malaria and is taking care of someone suffering from chicken pox.(iii) When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why? (b) Name any two infectious diseases against which vaccine is available.

[Marks:3]

20]

(a) What is the amount of work done:(i) By an electron revolving in a circular orbit of radius r round a nucleus?(ii) By an electron moving with half the speed of light in empty space free of all forces?(b) An electric pump is used to pump water from an underground sump to the overhead tank situated 20 m above. It transfers 2000 kg of water to overhead tank in 15 minutes. Calculate the power of pump.(c) What do you mean by instantaneous power of a device?         Or(a) Certain force acting on a 20 kg mass changes its velocity from 5m/s to 2m/s. Calculate the work done by the force.(b) State two possible conditions under which the work done would be zero.(c) If the kinetic energy of the body is increased by 300% then determine the percentage increase in the momentum.

[Marks:5]

21]

The volume of a 500 gm sealed packet is 350 cm3. Will the packet float or sink in water if the density of water is 1gm cm-3, explain it. What will be the mass of the water displaced by this packet?ORWhat are the characteristics of sound? Discuss each one of them briefly.

[Marks:5]

22]

[Marks:5]

23]

[Marks:5]

24]

(a) What type of characteristics are possessed by the chordates? Give three points.(b) Why fungi and bacteria are considered as plants even though they do not have chlorophyll?(c) What is notochord?Or(a) Give any three differences between bony and cartilaginous fish.(b) What are cold blooded animals?(c) Name the excretory organs of: (i) Sponges (ii) Annelids

[Marks:5]

25]

In the experiment of verifying the law of reflection of sound the clock should be placed just at the edge of tubes so that:

[Marks:1]

A. Tubes may transmit sound.B. Disturbance due to wind is avoided.

C.Sound produced by clock becomes a musical sound.

D.Only sound passing through tube no. 1 and reflected from wall comes through tube no. 2 is received.

26]

[Marks:1]

A. =125 gB. >125 g

C.Faulty balance, hence cannot estimate.

D. <125 g27]

[Marks:1]

A. 25 equal partsB. 5 equal partsC. 2 equal partsD. 10 equal parts

28]

If we want to determine the volume of a solid by immersing it in water, the solid should be

[Marks:1]

A. Lighter than waterB. Heavier than waterC. Insoluble in water

D.Heavier than water and insoluble in it

29]

[Marks:1]

A. AB. CC. DD. B

30]

In which of the following medium will the sound waves travel faster? [Marks:1]

A. AirB. Vacuum ofC. WaterD. Steel

31]

For a given applied thrust, pressure exerted on a surface by a sharp pin is [Marks:1]

A.less than the pressure exerted by a blunt pin.

B.equal to the pressure exerted by a blunt pin.

C.either less or equal to the pressure exerted by a blunt pin.

D.more than the pressure exerted by a blunt pin.

32]

In an experiment to observe and compare the pressure exerted by a solid on sand, a student placed the iron cuboid on sand in three different manners in contact with sand as A1, A2 and A3 respectively. If the corresponding depress observed by him were d1, d2 and d3, then

[Marks:1]

A.

B.

C.

D.

33 Which of the following reagents are used in the experiment to verify the law of [Marks:

] conservation of mass along with sodium sulphate? 1]A. Copper sulphateB. Lead nitrateC. Sodium chlorideD. Barium chloride

34]

Which type of reaction is being used in the experiment of verifying the law of conservation of mass?

[Marks:1]

A. Displacement reactionB. Decomposition reactionC. Double decomposition reactionD. Precipitation reaction

35]

Which of the following belongs to thallophyta? [Marks:1]

A. PinusB. FernC. All of themD. Spirogyra

36]

[Marks:1]

A. UlothrixB. ChlamydomonasC. CladophoraD. Spirogyra

37]

[Marks:1]

A. a bryophyte

B. a pteridophyteC. a gymnospermD. an angiosperm

38]

Rudra, Rehman, Shweta and Parol were given a specimen of fern for recognising the main characters of pteridophyta. Each one wrote four characters in favour of answer. Who gave the right answer?

[Marks:1]

A.

B.

C.

D.

39]

[Marks:1]

A. AB. CC. DD. B

40]

A specimen of a fish was given to students to identify the externally visible chordate feature in it. The student would look for

[Marks:1]

A. OperculumB. NotochordC. Dorsal tubular nerve cordD. Post anal tail

41]

[Marks:1]

A. Antennae of A and segments of B.

B.Three pairs of appendages of A and clitellum of B.

C. Wings of A and slender body of B.

D.Jointed appendages of A and segmented body of B without appendages.

42]

Rajiv found out the role of spiracle in a cockroach as: [Marks:1]

A. ExcretionB. CirculationC. MovementD. Respiration

Click here to view Solutions

Solutions:

1] So that hammer has higher amount of potential energy and hence more work can be done on the chisel.

2] Some examples of polyatomic ions are NO3-, NH4

+, OH-, SO42-, and SO3

2-.3] Nitrogen and oxygen.4] (a) Swimmers are provided with an inflated rubber jacket or rubber tube. The jacket tube

has low weight and large volume. Hence, it displaces large volume of water. As a result, up thrust due to water increases and the person remains floating i.e., there is no chance of drowning of the swimmer in such case.(b) It is easier to swim in sea water because density of sea water is more due to its salty nature. Hence, up thrust acting on the swimmer in sea water is more in case of sea water than in fresh water. So, it is easier to swim in sea water.

5]

6] (a) Ground water is used for:(i) human consumption(ii) irrigation(b) It absorbs harmful radiations such as UV rays from the sun which are injurious to human beings.

7] (a) The factors which influence the patterns of winds are;(i) The rotation of the earth.(ii) The presence of mountain ranges in the paths of the wind.(b) Two green house gases are carbon di oxide and methane.

8]

9]

10]

11]

12]

13]

14]

15]

16] (a) Common names of plants and animals differ from one country to other and from state to another in one country whereas the scientific name is universal, being used all over the world irrespective of the language of the people.(b) Amphibia -Cold-blooded animal having three-chambered heart.Aves -Warm-blooded animal having four-chambered heart

17] (a) (i) Vector (ii) Vaccination(b) AIDS - Acquired Immuno Deficiency Syndrome.Human Immuno deficiency virus.

18] (a) Each and every organism is given a biological name, which consist of two components, one is genus name and second is species name.For example, the scientific name of man is "Homo Sapiens", where the genus name of man is Homo and the specific name is sapiens.(b) (i) Body is unsegmented and is covered by calcareous spines.(ii) Sexes are separate.

19] (a) A person is most likely to fall sick under condition mentioned at (iii).Reason:After recovering from malaria she is on a four day fast. Fasting weakens the body immune system and she is likely to get chicken pox as chicken pox is a contagious disease which spreads through direct contact with the patient.(b) Tetanus, Diphtheria, Whooping cough, Measles, Polio(Any two)

20]

21]

22]

23]

24]

25] Only sound passing through tube no. 1 and reflected from wall comes through tube no. 2 is received.

26] <125 g27] 10 equal parts28] Heavier than water and insoluble in it29] B30] Steel31] more than the pressure exerted by a blunt pin.32]

33] Barium chloride34] Precipitation reaction35] Spirogyra36] Spirogyra37] an angiosperm

38]

39] B40] Post anal tail41] Antennae of A and segments of B.42] Respiration

Questions:

1] When do we say that work is done? [Marks:1]

2] What is an atom? [Marks:1]

3] Name two processes that play an important role in oxygen cycle. [Marks:1]

4] Distinguish between loudness and intensity of sound. [Marks:2]

5] (a) How many cotyledons are present in the seeds of monocots and dicots? (b)Why do bryophytes called as amphibians of the plant kingdom?

[Marks:2]

6] (a) Name the carbon compound responsible for depletion of ozone.(b) What are the different states in which water is found during the water cycle?

[Marks:2]

7] List one similarity and one difference between fungi and plant. [Marks:2]

8] Draw a neat diagram of human ear and label external ear, middle ear and inner ear.

[Marks:3]

9] A man whose mass is 50 kg climbs up 30 steps of the stairs in 30 seconds. If each step is 20 cm high, calculate the power used in climbing the stairs.

[Marks:3]

10]

(a) Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.(b) What is the consequence of two sound waves which arrive at the ear in a time interval shorter than 0.1 s?

[Marks:3]

11]

Calculate the force exerted by the brakes when a motor car weighing 2000kg travelling at 20 ms-1 stops at a distance of 50m retarding uniformly. Also calculate the work done by the brakes.

[Marks:3]

12]

Distinguish between transverse waves and longitudinal waves. [Marks:3]

13 What is the mass of? [Marks:

] (i) 0.2 mole of oxygen atoms?(ii) 0.5 mole of water molecules?

3]

14]

(a) What is the significance of symbols? (b) Define the atomic mass unit.(c) Why is it not possible to see an atom with naked eyes?

[Marks:3]

15]

(a) Draw a sketch of Bohr's model of an atom with three shells.(b) If K and L shell of an atom are full, then what would be the total number of electrons in the atom? (c) What is the charge on protons?

[Marks:3]

16]

What precautions can you take in your school to reduce the incidence of infectious diseases? Mention any three points.

[Marks:3]

17]

(a) Who discovered vaccine for the first time?(b) What is an antibiotic? Give two examples.

[Marks:3]

18]

(a) Give one word for:(i) Diseases which can spread from one person to another.(ii) Diseases which are present since birth.(iii) Diseases which last for short duration.(iv) Diseases which last for longer duration.(b) What is vaccination?

[Marks:3]

19]

(a) Define(i) Vector(ii) Carrier(b) What are the modes of transmission of AIDS?

[Marks:3]

20]

State and prove Archimedes' principle.OrWhat are multiple echoes? Discuss their important practical applications.

[Marks:5]

21]

[Marks:5]

22]

[Marks:5]

23]

(a) What would be the impact of increase in the concentration of carbon dioxide in the atmosphere?(b) (i) What do you mean by biogeochemical cycles? Name any two of the

[Marks:5]

Biogeochemical cycles.(ii) Nitrogen cycle is called a perfect cycle in nature. Explain.Or(a) (i) Name two agents of soil erosion(ii) Write any two steps used to control soil erosion.(b) A forest area has cleaned by cutting trees for industrialisation purpose. List any two changes that will be brought in the water cycle of that area.

24]

If we want to determine the volume of a solid by immersing it in water, the solid should be

[Marks:1]

A. Any solidB. Heavier than waterC. Insoluble in water

D.Heavier than water and insoluble in it

25]

S.I. unit of weight is [Marks:1]

A. 1 kgB. 1 gC. 1 g wtD. 1 N

26]

A spring balance [Marks:1]

A. Can measure weight only.B. Is used to determine density.C. Is used to measure mass only.

D.May be used to determine mass as well as weight.

27]

[Marks:1]

A. 118gB. 120g

C. 125gD. 115g

28]

Density of salty water as compared to the density of pure water [Marks:1]

A. is lessB. is equalC. may be less or moreD. is always more

29]

Which principle tells us about the decrease in weight of a body when immersed in a liquid?

[Marks:1]

A. Pascal's lawB. Avogadro's lawC. Boyle's lawD. Archimedes' law

30]

Sound waves in air are: [Marks:1]

A. Transverse wavesB. Shock wavesC. Radio wavesD. Longitudinal waves

31]

The thread used to tie a solid should be [Marks:1]

A. As fine as possibleB. ThickC. A metallic wireD. Fine but strong enough

32]

What is the correct statement of the 'Law of Conservation of Mass'? [Marks:1]

A.The elements are always present in a constant proportion in a chemical substance.

B.

If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.

C.The rate of reaciton is directly proportional to the active mass of the reactants.

D.That mass can neither be created nor be destroyed.

33]

According to Law of conservation of mass of reactants wil be equal to the mass of [Marks:1]

A. CatalystsB. Heat released

C. Heat absorbedD. Products

34]

[Marks:1]

A. Cells of the body.

B.Cell walls separating the cells of the body.

C.Vertically arranged muscles of the body.

D.Septa separating segments of the body.

35]

Thallophyta is a group of plants which: [Marks:1]

A. Bear flowers.

B.Have well developed roots, stem and leaves.

C. Have naked seeds.

D.Do not have well differentiated body.

36]

The exoskeleton of cockroach is made up of: [Marks:1]

A. CartilageB. Calcium and phosphorousC. CelluloseD. Chitin

37]

Bala observed the position of mouth in a bony fish as: [Marks:1]

A. Dorsally placedB. Ventrally placedC. Anteriorly placedD. Terminal placed

38]

[Marks:1]

A. Jointed legs

B. Mouth partC. SpiracleD. Antenna

39]

[Marks:1]

A. GillsB. PiliusC. AnnulusD. Stipe

40]

The sub division of Spirogyra is: [Marks:1]

A. FungiB. BryophytaC. PteridophytaD. Algae

41]

[Marks:1]

A. UlothrixB. ChlamydomonasC. CladophoraD. Spirogyra

42]

[Marks:0]

Solutions:

1] When a force acts on an object and displacement occurs in the direction of force, we say that work is done.

2] An atom is a building block of all kinds of matter.

3] (i) Photosynthesis(ii) Respiration

4] Intensity of sound is the amount of sound energy passing each second through unit area.Loudness is the measure of response of the ear to the sound.

5] (a) Monocots have one cotyledon where as Dicots have two cotyledons.(b)Bryophytes are called amphibians amongst plants because they live in damp areas as:(i) The plant body of bryophytes is devoid of vascular tissues, roots, etc.(ii) Like amphibians of animal kingdom, the sperms require an external supply of water for swimming and reaching the eggs for fertilizing the same.

6] (a) CFC's (Chloro fluoro carbons)(b) The different states in which water is found during the water cycle are liquid (water), gas (water vapour) and solid (snow).

7] Similarity: Both fungi and plant cell have an outermost covering of cell wall.Difference• In fungi cell wall is made up of Chitin.• In plants cell wall is made up of Cellulose.

8]

9]

10]

11]

12]

13]

14]

(a) (i) It represents the name of the element.(ii) It represents one atom of the element.(b) One atomic mass unit is the mass unit equal to exactly one - twelfth the mass of one atom of carbon - 12.(c) Because the size of an atom is too small.

15]

16]

(i) Prevent water logging to avoid mosquito breeding.(ii) Provision of safe drinking water.(iii) Periodic cleaning of toilets.

17]

(a) Edward Jenner(b) Antibiotic is a chemical substance that kills pathogens. They are secreted byMicroorganisms, like fungi and bacteria.Example- Penicillin and streptomycin.

18]

(a) (i) Infectious diseases or communicable diseases(ii) Congenital diseases(iii) Acute diseases(iv) Chronic diseases(b) The process of injecting killed or attenuated microbes in order to activate the immune system against disease causing microbes to prevent from diseases is vaccination.

19]

(a) (i) Vectors: Organisms which carry disease causing organism from person to person. Pathogen completes some part of its life cycle in vector's body. Example: Mosquito.(ii) Carrier: Organisms which carry pathogens from one person to another. Pathogens are not able to complete their life cycle in carriers. Example: Housefly(b) Modes of transmission of AIDS are:(i) Blood transfusion(ii) Unprotected sexual contact.

20]

21]

22]

23]

24]

Heavier than water and insoluble in it

25]

1 N

26]

May be used to determine mass as well as weight.

27]

115g

28]

is always more

29]

Archimedes' law

30]

Longitudinal waves

31]

Fine but strong enough

32]

That mass can neither be created nor be destroyed.

33]

Products

34]

Septa separating segments of the body.

35]

Do not have well differentiated body.

36]

Chitin

37]

Terminal placed

38]

Antenna

39]

Stipe

40]

Algae

41]

Spirogyra

42]