Sample Paper | Class IX | Chemistry | CBSE | 2008
Sample Paper – 2008
Class – IX
Subject – Chemistry
Topic: Matter in Our Surroundings Class :IX
Very Short answer Questions
- Define matter. Give four examples of matter.
- Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?
- In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
- When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?
- What is the scientific name of particles which make up matter?
- What is the physical state of water at (i) 250 K (ii) 2500C
- Convert the following temperatures to the Celsius scale.
a) 293 K b) 470 K
- Define latent heat of vaporisation.
- What will be the effect of change of pressure on the state of a matter?
- Define ‘melting point of a substance’? What is the melting point of ice?
Short Answer Questions
- Explain the factors which affect the rate of evaporation.
- Give reasons:
a) the rate of diffusion of liquids is higher than that of solids
b) Steam produces more severe burns than boiling water.
- Which produces more severe burns: boiling water or steam? Why?
- Why should we wear cotton clothes in summer?
- Give two reasons to justify that:
a) Water is a liquid at room temperature.
b) An iron almirah is a solid.
- Write the full forms of the following:
- LPG b. CNG
- What is diffusion? Which diffuse faster: a liquid or a gas?
- Why is ice at 273 K more effective in cooling than water at the same temperature?
- What is sublimation? Name two substances which undergo sublimation?
- What factors are responsible for the change in state of solid carbondioxide when kept exposed to air?
Long Answer Questions
- Compare the properties of solids, liquids and gases in tabular form?
- What are the characteristics of matter?
- What do you understand by the term ‘latent heat’? What are the two types of latent heat?
- Which contain more heat, 1 kg of water at 1000C or 1 kg of steam at 1000C? Give reason for your answer.
- Draw the ‘states of matter triangle’ to show the interconversion of states of matter.
- How will you demonstrate that water vapour is present in air?
- Explain the following:
- Why do gases have neither a fixed shape nor a fixed volume?
- A sponge can be compressed easily, so why do we call sponge a solid?
- Why latent heat does not cause a rise in temperature of the substance?
- Why the temperature of boiling water does not rise even though heat is given continuously?
- What properties of particles decide whether a given substance will exist as a solid, a liquid or a gas?