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9th CBSE Science - Matter in Our Surroundings Five Mark Question Paper

Published on: 23/09/2019

Matter in Our Surroundings

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 4

7 x 4 = 28

Give two reasons to justify:
(a) water at room temperature is a liquid.
(b) an iron almirah is a solid at room temperature.

Convert the following temperatures to Kelvin scale.
(a) \(25°C\)
(b) \(373°C.\)

What type of clothes should we wear in summer?

How does the water kept in an earthen pot(matka) become cool during summer?

Name the state of matter in which:
(i) layers of particles can slip and slide over each other
(ii)particles just move around randomly because of very weak force of attraction.

List two properties that liquids have in common with gases.

A wooden chair is a solid at room temperature.Give two reasons.

Generic 5

1 x 5 = 5

Differentiate between properties or characteristics of three states of matter.

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Answers Key:

Generic 4

7 x 4 = 28

(a) Water at room temperature is a liquid because it has fluidity and assumes the shape of the containing vessel.
(b) An almirah is a solid because it is rigid and has a fixed shape.

(a) \(25°C=25+273=298K\)
(b) \(373°C=373+273=646K.\)

We should wear cotton clothes during summer season.Because during summer we perspire more to maintain the temperature of our body.Cotton is a good absorber of water(sweat).It then exposes the water to atmosphere for easy evaporation leaving us dry and cool.

Earthern pot becomes cool during summers particularly on hot dry day because water evaporation from the pot becomes easier.

(i) Liquid
(ii) Gas

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

A wooden chair is a solid because
(a) it is rigid.
(b) it has definite shape.

Generic 5

1 x 5 = 5

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