Chapter 1 | Matter in our surrounding | Support Material | Assignment Questions

1. Write different states of matter.

2. Which has more density – liquid or solid ?

3. What is the melting point of ice ?

4. Boiling point of alcohol is 78º C. Change it into Kelvin scale ?

5. Why do gas exert pressure ?

6. How do we liquefy the gases ?

1. Classify the matter on the basis of physical and chemical characteristics ?

2. Why solid carbon dioxide is called ‘dry ice’ ?

3. Why do we keep ether and acetone at cool places ?

4. Write two factors which will increase rate of evaporation ?

5. Which gas is supplied in the liquefied form at home and in hospitals ?

1. Compare the force of attraction between iron, rubber band and chalk ?

2. Arrange sugar, water and oxygen in the increasing order of force of attraction between their particles ?

3. Define boiling point, melting point and evaporation ?

1. Describe the factors affecting evaporation ?

2. (a) Why do we wear cotton clothes in summers ?

(b) Why do we feel cold, when we keep acetone and ether on our palm ?

3. Write three characteristics of particles of matter. Give one example of each ?

4. Write the characteristic responsible for :

(a) Smell of perfume spreads in the room.

(b) Water takes the shape of the container in which it is kept.

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Chapter 1 | Matter in our surrounding | Support Material | Assignment Questions | Class 9th Science |