science paper 1

8/2/2019 Science Paper 1

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CBSE Class IX Science paper - SA II

Total marks : 90 Total time: 3:00 Hr s

Test instr uctions: Gener al Instr uctions: 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 fivemarks 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 toyou.

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 e lectrons?

[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.

(b) A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02s. If the speed

[Marks:5]




of sound in salt water is 1531 m/s, how far away is the cliff?

22]

[Marks:5]

23]

[Marks:5]

24]

[Marks:5]

25] Waves propagate well in [Marks:1]

A. Unloaded slinky

B. Equally in (a) and (b)

C. None of these

D. 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 spacebetween 5 ml and 10 ml mark should be divided into

[Marks:1]

A. 25 equal parts

B. 5 equal parts

C. 2 equal parts

D. 10 equal parts

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

A. Evaporation

B. Mixing of sand

C. Stagnation

D. 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. Green

B. Blue




C. Yellow

D. 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 wholenumbers.

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.

35]

[Marks:1]

A. Ulothrix

B. Chlamydomonas

C. Cladophora

D. 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 fin




B. Dorsal fin and anal fin

C. Dorsal fin only

D. Caudal fin only

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

A. Jointed legs

B. Compound eyes

C. Wings

D. 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 cytoplasmicstrands, presence of pyrenoids

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

A. Bryophyta

B. Gymnosperm

C. Angiosperm

D. Pteridophyta

42]

[Marks:1]

A. Pointed head

B. Bulky thorax

C. Presence of scales

D. post anal tail

science paper 1

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