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Matter In Our Surroundings - Important Questions Model Question Paper 1 In 9th Science

Published on: 27/07/2018

In this question paper prepared from the chapter Matter in Our Surroundings. The important questions are covers from the Higher Order Thinking Questions and Value Based Questions

Download CBSE Class 9th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 9th Standard CBSE Science

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Std: 9th Standard CBSE - Science

chapter: - Model Question paper

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Questions:

Generic 2

3 x 2 = 6

How is pressure developed in a container full of a gas?

What happens when a crystal of potassium permanganate is dropped in a glass tumbler containing water?What conclusion can you draw?

In what ways air can be considered as matter?

Generic 3

2 x 3 = 6

Since early times human beings have been trying to understand their surroundings. As we look our surroundings we have a larger variety of things with different shapes, sizes and textures. Everything in this universe includes the air we breathe, the food we eat or store, clouds, stars, plants, elements, even a drop of water or a particle of water or a particle of sand. We can also see as we look around us that all the things mentioned are either visible or invisible.
(a) What do you call all these materials in one word?
(b) Write at least two characteristics that you can draw from above observation.
(c) In how many forms these materials are available to us?
(d) Can you consider smell or love as materials?
(e) What social consideration can draw from above findings?

Give an example of i) a liquid diffusing into a solid, ii) solid diffusing into a liquid and iii) Solid diffusing into a solid.

Generic 4

5 x 4 = 20

Which phenomenon occurs during the following changes?
(a) Formation of clouds
(b) Drying of wet clothes
(c) Wax melts in the sun.
(d) Size of naphthalene balls decreases.

Compare a block of wood, water and air on the basis of the following:
(i) Compressibility
(ii) Particle motion
(iii) Rigidity

Classify the following materials according to the state in which they exist around us:
Steel, blood, air, oil, rubber, honey, carbon dioxide, kerosene, LPG, CNG, nitrogen, oxygen, glass.

List two properties that liquids have in common with gases.

10.

Give reasons for the following observations:
The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Generic 5

1 x 5 = 5

11.

Differentiate between properties or characteristics of three states of matter.

Fill up / 1 Marks

4 x 1 = 4

12.

The sun and stars glow because of the presence of .......... in them.

13.

Rate of evaporation increases with ......... of the vessel.

14.

The energy possessed by a particle by virtue of its motion is called __________ energy.

15.

A material in liquid state can have any ___________

Multiple Choice Question

1 x 1 = 1

16.

Gases can be easily compressed because these have least intermolecular interactions_________

(a)

assertion is correct and reason is correct

(b)

assertion is correct and reason is wrong

(c)

assertion is wrong and reason is correct

(d)

assertion is wrong and reason is wrong.

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Answers Key:

Generic 2

3 x 2 = 6

In the container, the gaseous particles are free to move.These move at high speed and collide with other particles or walls of the container.The bombardment of the particles on the walls of the container produces a steady force that depends on the temperature.This force per unit area is called as pressure of the gas.

When a crystal of pottasium permaganate is dropped in a glass tumbler containing water, then the colour of pottasium permanganate spreads throughout the water in the glass.This shows that the particles of matter are continuosly moving.

Air is matter because it has mass and occupies space.

Generic 3

2 x 3 = 6

(a) Matter
(b) Matter occupies space and mass
(c) matter is available to us solid, liquid or gas.
(d) Smell and love cannot be considered as matter as these are only feelings.You cannot assign any be mass or volume to a love or smell
(e) Trivial things can be significant.It should not be ignored.

(i) Liquid diffusing into solid.If we put a drop of ink on the centre of a clean blotting paper, we find the liquid spreads out by diffusing into the blotting paper which is a solid.
(ii) Solid diffusing into liquid.When we put a crystal of potassium permanganate in water, slowly the colour of potassium permanganate spreads throughout water.
(iii) Diffusion of a solid into a solid.Diffusion of solids into solids is very very slow.So diffusion of a solid into other solids is rare and very small.When we write on a blackboard with a chalk, we can easily clean it.But if it is left uncleaned for few days, it becomes difficult to clean the blackboard.This is because there is a slight diffusion of chalk particles.i.e., solid into the solid blackboard.

Generic 4

5 x 4 = 20

(a) Condensation
(b) Evaporation
(c) Fusion
(d) Sublimation

(i) Compressibility : wood
(ii) Particle motion : wood
(iii) Rigidity: air

Solid -steel, rubber, glass
Liquid -Blood, oil, honey, kerosene, LPG
Gas -Air, carbon dioxide, CNG, nitrogen, oxygen.

common properties of liquids and gases:
(a) Both have fluidity.
(b) Both attain the shape of the container.

10.

The smell of hot sizzling food reaches us several metres away because food particles diffuse faster in air when hot and we smell it in no time whereas cold food particles would take a long time to diffuse and we have to go close to have a smell of it.

Generic 5

1 x 5 = 5

11.

S.NO	Properties	Solids	Liquids	Gases
(i)	Rigidity and compressibility	They are rigid and cannot be compressed	Ther are not rigid and can be compressed to a little extent	They are not rigid at all and can be easily compressed
(ii)	Shape	They have definite shape	They take the shape of the containing vessel	They have no definite shape
(iii)	Volume	They have definite volume	They have definite volume	They have no definite volume
(iv)	Fluidity	Fluidity is nil i.e., they cannot flow.	They are slippery and flow from higher level to lower level	they flow in all directions.
(v)	Storage	They can be stored without vessel	They can be stored in a vessel only. Open vessel may also work.	They can be stored in a closed vessel only
(vi)	Intermolecular force	Intermolecular force is maximum	Intermolecular force is lesser than in solids but greater than gases	Intermolecular force is minimum.
(vii)	Space	Intermolecular space is least	Intermolecular space is greater than solids but lesser than gases.	Intermolecular space is maximum
(viii)	Diffusion	Diffusion is almost nil	Diffuse slowly	Diffuse easily