KUWAIT SAHODAYA FINAL EXAMINATION SESSION: 2018 …the object? OR A bullet of mass 5g hitting a sand...

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KUWAIT SAHODAYA FINAL EXAMINATION

SESSION: 2018-2019

Class: IX SCIENCE (086) Date: …/… /2019

Time: 3 hours SET-1 Max. Marks: 80

General Instructions:

(i)The question paper comprises of five sections –A, B,C,D and E. You are to attempt all the

sections.

(ii)All questions are compulsory.

(iii) Internal choice is given in sections C,D and E.

(iv) Question numbers 1 and 2 in section-A are one mark questions. They are to be answered in one

word or in one sentence.

(v) Question numbers 3 to 5 in section- B are two marks questions. These are to be answered in

about 30 words each.

(vi) Question numbers 6 to 15 in Section- C are three marks questions. These are to be answered

in about 50 words each.

(vii)Question numbers 16 to 21 in Section-D are five marks questions. These are to be answered in

about 70 words each.

(viii)Question numbers 22 to 27 in Section-E are based on practical skills. Each question is a two

marks question. These are to be answered in brief.

SECTION – A

1 The relative density of mercury is 13.6. What does this mean?

1

2 Write the chemical formulae for the following compounds.

(a) Magnesium Chloride (b) Ammonium Carbonate

1

SECTION – B

3 What is meant by Crystallisation? List two ways in which Crystallisation technique is

better than simple evaporation technique.

2

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4 (a) Which separation technique will you apply for the separation of the following:

1. Butter from curd 2. Drugs from blood

(b) Give one point of difference between physical change and chemical change.

2

5 Humus is a major factor in deciding the soil structure. Why?

2

SECTION – C

6 Give reason for the following:

(a) It is easier to stop a tennis ball than a cricket ball moving with same speed.

(b) A gunman gets a jerk on firing a bullet

(c) Luggage placed on the roof of a car or bus is tied with rope.

3

7 (a) What is an echo? What are the minimum conditions required for an echo to be heard

at a temperature of about 22°C in air?

(b) Draw the graphical representation of two sound waves having same frequency but

different amplitudes.

3

8 Provide reasons for the following:

1. Water kept in an earthen pot becomes cool during summer.

2. A gas exerts pressure on the walls of the container.

3. Particles in steam at 100o C have more energy than water at the same temperature.

3

9 What are the important features of Rutherford’s nuclear model of an atom?

3

10 Write one function of the following.

a) Xylem parenchyma

b) Phloem

c) Lateral meristem

OR

Where are areolar tissue found in human body? What are their functions?

3

11 Which cell organelle is known as power house of cell? Why?

Briefly explain its structure.

3

12 What is lactation period? Name any two breeds of cattle which are selected for their

long lactation period. Why are they crossed with local breeds?

3

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13 (a) An atom of an element ‘X’ has 17 protons and 18 neutrons in it.

1. What is the number of valence electrons in it?

2. What is its mass number?

3. Write the name and the valency of the element X.

(b) What are isotopes? Give an application of it.

OR

(a) Based on Rutherford’s experiment, give experimental evidence to show that ,

1. The whole mass of an atom is concentrated at the nucleus.

2. An atom has a lot of empty space in it.

(b) An element has 2 electrons in its M shell. What is its atomic number? Identify the

element.

3

14 A constant force acts on an object of 5 kg mass for a period of 2 seconds. It increases

the objects velocity from 3m/s to 7m/s. Find the magnitude of the applied force? Now,

if the force were applied for a period of 5 seconds, what would be the final velocity of

the object?

OR

A bullet of mass 5g hitting a sand bag suspended in air gets embedded in it. If the

velocity of the bullet is 900m/s just before it, find out the speed with which the sand

bag will move due to the impact of the bullet. The mass of the sand bag is 50kg.

3

15 State Newton’s law of Gravitation. What will happen to the gravitational force when (a)

distance between two objects is doubled (b) mass of one of the objects is doubled?

3

SECTION – D

16 (a) “The motion of a body which is moving with constant speed in a circular path is said

to be accelerated”. Explain.

Identify the force that causes this acceleration and its direction.

(b) A cyclist goes around a semi-circular track of radius 105 m with constant speed in 2

minutes. Calculate the (i) distance covered (ii) displacement, and (iii) speed of the

cyclist.

OR

(a) Derive an equation for position-velocity relation.

(b) A car accelerates from 5m/s to 15m/s in 10seconds. Calculate the (i) acceleration

and (ii) the distance covered by the car during this time interval.

5

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17 (a) Derive the relation between work done and change in kinetic energy.

(b) A ball of mass 1kg is dropped from a height of 5m. Find the kinetic energy of the

ball just before it reaches the ground. What is the speed with which it hits the ground?

5

18 Answer the following questions:-

(a) Define atomicity.

(b) Classify the following as monoatomic , diatomic, triatomic and tetra atomic:

Argon, Ozone, Nitrogen, Phosphorous

(c) Calculate the number of molecules of Sulphur (S8) present in 16 g of solid Sulphur.

( Atomic mass of Sulphur= 32 u)

OR

(a) State the law of constant proportion. Which postulate of Dalton’s atomic theory

supports the above law.

(b) What are poly atomic ions? Give an example.

(c )Which has more number of atoms? 100g of Sodium or 100g of Aluminium.

(Atomic mass of Na – 23 u; Al - 27 u)

5

19 (a) Explain the basis for grouping organisms into five kingdom.

(b) Enlist any two main features of fungi.

(c) What are lichens?

OR

(a) Identify the class/phylum of animals having the following characteristic features.

Give an example of each.

i) Non motile animals which have pores all over the body.

ii) Animals have jointed legs and coelomic cavity filled with blood.

(b) Differentiate between Aves and Reptiles.

(c) Define bilateral symmetry.

5

20 (a) Make a schematic diagram of carbon cycle.

(b) What is the role of the atmosphere in climate control?

5

21 (a) It was diagnosed that the body of a patient has lost his power of fighting any

infection.

i) Name the disease and causative organism.

ii) Mention two ways by which it spreads from one person to another.

(b) What is meant by inflammation? Give one local and general effect of inflammation.

5

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SECTION – E

22 What do you observe when an iron nail is placed in Copper Sulphate solution? Provide

reason for your observation.

OR

What happens when:

(a) Magnesium ribbon is burnt in air.

(b) Sodium Sulphate solution is mixed with Barium chloride solution.

2

23 When a mixture of iron filings and Sulphur is heated in a china dish, a black coloured

substance is formed.

(a) What is the name and chemical formula of the compound?

(b) Can we separate iron from this compound by using a bar magnet? Give reason.

2

24 What precautions would you take while preparing a stained temporary mount of onion

peel cells?

2

25 Mention two identifying features of each of skeletal and smooth muscle.

OR

Akansha had observed a slide of plant tissue under the microscope and drawn the

sketch.

a) Identify the observed tissue by Akansha

b) Write its main functions.

2

26 An object weighing 10N in air, weighs 8N in liquid A and 9N in liquid B. In which liquid,

the buoyant force experienced by the object is more and why?

OR

2

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There are 4 beakers containing 100 ml of water. In beaker A, 5g of common salt is

dissolved. Similarly, in beakers B, C and D 10g, 15g and 20g of common salt is dissolved.

A stone suspended from a spring balance weighs 60g. The stone is immersed in each

beaker one by one and reading is observed. In which case spring balance shows least

weight and why?

27 Identify the types of waves produced by the stretched slinky shown below. List any one

property of each.

Figure A

Figure B

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2

KUWAIT SAHODAYA FINAL EXAMINATION

SESSION: 2018-2019

Class: IX SCIENCE (086) Date: …/… /2019

Time: 3 hours MARKING SCHEME Max. Marks: 80

Set-

3

Set-

2

Set-

1

SECTION – A

1 2 1 Mercury is 13.6 times as heavy as an equal volume of water

1

1

2 1 2 a) MgCl2 b) (NH4) 2 CO3

½ X2

1

SECTION – B

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5 3 3 Crystallization is a process that separates pure solid in the form of its crystals

from a solution

It is better than simple evaporation because :

1. Some solids decompose or some like sugar may get charred on heating.

2. Some impurities may remain dissolved in the solution even after filtration. On

evaporation, these contaminate the solid.

1,1 2

4 4 4 (a) 1. Centrifugation 2. Chromatography

(b) Any one difference.

½ X2

1

2

3 5 5 Because (i) it causes the soil to become more porous

(ii) allows water and air to penetrate deep underground

1+1 2

SECTION – C

6 8 6 Newton's second law. Explanation.

Newton's third law. Explanation

Newton's first law. Explanation

1x3 3

8 7 7

(a)

(b)

Repeated reflection of sound

Minimum distance of the obstacle from the source of sound must be 17.2m.

Time interval between the original sound and the reflected sound must be at least

0.1 second

1

½

½

½

½

3

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7 6 8 (i) Water will come out through the small pores in the earthen pot and will get

evaporated by absorbing energy from the water thus making it cool

(ii) Gas particles can move freely as they have less force of attraction between

the particles. The pressure exerted by the gas is due to the force exerted by

the gas particles per unit area on the walls of the container

(iii) Particles in steam have absorbed extra energy in the form of latent heat of

vaporization

1x3 3

9 11 9 Important features of Rutherford’s model

1. There is a positively charge at the center in an atom called the nucleus. All the

mass of an atom resides in the nucleus.

2. The electrons revolve around the nucleus in well-defined orbits.

3. The size of the nucleus is very small as compared to the size of the atom

3 3

10 10 10 a) Stores food and helps in sideways conduction of water

b) Transports food from leaves to other parts of the plant

c) Increases the girth of root or stem

OR

Location: between the skin and muscles, around blood vessels and nerves, in the

bone marrow

Functions: fills the space inside the organs, supports internal organs, and helps in

repair of tissues.

1+1+1

1½

1½

3

12 9 11 Mitochondria

The energy required for various chemical activities needed for life is released by

mitochondria in the form of ATP

Structure:

Rod shaped: double membrane-outer membrane- very porous, inner membrane-

deeply folded which create a large surface area for ATP generating chemical

reactions.

½

1

1½

3

11 15 12 The period of milk production after the birth of a calf.

Jersey, Brown Swiss

To get animals with both the desired qualities such as long lactation period and

disease resistance

1

1

1

3

15 13 13 (a) 1.Valence electrons = 7:

2. Mass number = 35

3. Chlorine: Valency =1

Isotopes are the atoms of the same element having the same atomic number but

different mass number. Anyone application.

OR

(a)1. A very small fraction of alpha particles were deflected by 180o

½

½

½ X2

1

1

3

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2. Most of the alpha particles pass through the gold foil without any deflection

(b)Atomic number = 12: Magnesium

1

½ X2

14 14 14

OR

½

½

½

½

½

½

1

1

1

3

13

12

15

Newton's Law of Gravitation - Correct statement

(a)

(b)

1x3

3

SECTION – D

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18 20 16 (a) It is because of the change in velocity due to change in the direction of

motion.

Centripetal force

Towards the center, along the radius

(b) (i) Distance covered =105 π m

(ii) Displacement = 2R= 210m

(iii) Speed = distance/ time = 7/8 π m/s

OR

(a) Graph with proper labelling

Appropriate steps

(b)(i)

Substitution

a= 1 m/s2

(ii)

Substitution

S=75m

1

½

½

1

1

1

1

1

½

½

½

½

½

½

5

17 21 17 (a)

(b)

Loss in P.E = Gain in K.E

= mgh

Substitution = 50 J

½

½

½

1

½

½

½

½

½

5

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16 19 18 (a) Atomicity is the number of atoms in a molecule.

(b) Argon – Monoatomic , Ozone – Triatomic, Nitrogen – Diatomic, Phosphorous

– Tetra atomic

(c ) Number of moles in 16g of Sulphur (S8) = 16/256= 0.0625

Number of molecules = n x Avogadro’s number = 0.0625 x 6.022 x 1023

= 3.76 x 1022 molecules.

OR

(a) In a chemical substance, elements are always present in definite proportion

by mass.

(b) The relative number and kind of atoms are constant in a given compound

(c ) A group of atoms carrying a charge is known as poly atomic ions. Any one

example.

The number of atoms of Na = n x Avogadro’s number

= 100/23 x 6.022 x 1023

= 2.618 x 1024

The number of atoms of Al = 100/27 x 6.022 x 1023 = 2.23 x 1024

Hence 100g of Sodium has more atoms.

1

½ X4

1,1

1,1

1

1,1

5

21 18 19 a) i) Number and complexity of cell structure – unicellular or multicellular,

prokaryotic or eukaryotic

ii) Presence or absence of cell wall

iii) Mode of nutrition – Autotrophic or Heterotrophic

b) Heterotrophic, eukaryotic, saprophytes, cell wall made up of chitin

( Any 2)

c) Lichen – Symbiotic association of fungus with blue- green algae

OR

a) i) Porifera – eg: Sycon, Spongilla

ii) Arthropoda eg: Prawns, Spiders, Scorpions

b) Reptiles Aves (Any 2)

Cold – blooded Warm blooded

Heart –mostly 3 chambered Heart – 4 chambered

Body covered with scales Body covered with feathers

c) Bilateral symmetry – The left and the right halves of the body have the

same design.

3

1

1

1+1

2

1

5

19 17 20 a) Refer text book page no. 199 Fig 14.7

b) The atmosphere prevents the sudden increase in temperature during the day

light hours. It slows down the escape of heat into outer space during night. Thus

the atmosphere keeps the average temperature of the earth fairly steady.

3

2

5

20 16 21 a) i) AIDS- HIV

II) Sexual contact with infected person

Blood to blood contact with infected person

Use of infected syringes or surgical instruments

From an infected mother to her baby during pregnancy (any 2)

1

2

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b) Inflammation- An active immune system recruits many cells to the

affected tissue to kill off the disease causing microbes. This recruitment

process is called inflammation.

Local effect- swelling and pain General effect- fever

1

1

SECTION – E

26 23 22 The blue colour of Copper Sulphate will change to green colour and the nail will

get coated with reddish brown copper. This is because iron being more reactive

than copper displaces copper from Copper Sulphate solution and pale green

colour

Fe SO4 solution is formed.

OR

(a) Magnesium burns in the air with dazzling white light and forms MgO

(b) White precipitate of barium Sulphate is formed

1,1

1,1

2

27 22 23 (a) Iron Sulphide: FeS

(b) No. When iron combine with sulphur it forms iron sulphide, a compound and it

loses its magnetic properties

1,1 2

24 26 24 Peels should be properly stained

Avoid folding of the peel.

Remove extra glycerin with the help of blotting paper.

Avoid entry of air bubbles while placing the cover slip. (Any 2)

1+1

2

25 27 25 Skeletal muscle- cylindrical ,unbranched, multinucleate, striated (Any 2)

Smooth muscle- spindle shaped, unstriated, uninucleate (Any 2)

OR

a) Parenchyma

b) Provide support , Stores food, Perform photosynthesis

1+1

½

1 ½

2

22 24 26 A.

Buoyant force experienced by object is more in Liquid A

OR

D.

Density of salt solution is maximum, hence it exerts greater up thrust.

1

1

1

1

2

23 25 27 Figure A -- Longitudinal waves

Any 1 property

Figure B -- Transverse waves

Any 1 property

½ x4

2

KUWAIT SAHODAYA FINAL EXAMINATION SESSION: 2018 …the object? OR A bullet of mass 5g hitting a sand...

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