CBSE 2008, Chemistry, Sample Question Paper, Class IX

Sample Paper – 2008 Class – IX Subject -Chemistry Topic: Matter in Our Surroundings Class :IX Very Short answer Questions 1. Define matter. Give four examples of matter. 2. Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own? 3. 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? 4. 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? 5. What is the scientific name of particles which make up matter? 6. What is the physical state of water at (i) 250 K (ii) 2500C 7. Convert the following temperatures to the Celsius scale. a) 293 K b) 470 K 8. Define latent heat of vaporisation. 9. What will be the effect of change of pressure on the state of a matter? 10. Define ‘melting point of a substance’? What is the melting point of ice? Short Answer Questions 11. Explain the factors which affect the rate of evaporation. 12. Give reasons: a) the rate of diffusion of liquids is higher than that of solids b) Steam produces more severe burns than boiling water. 13. Which produces more severe burns: boiling water or steam? Why? 14. Why should we wear cotton clothes in summer? 15. Give two reasons to justify that: a) Water is a liquid at room temperature. b) An iron almirah is a solid. 16. Write the full forms of the following: a. LPG b. CNG 17. What is diffusion? Which diffuse faster: a liquid or a gas? 18. Why is ice at 273 K more effective in cooling than water at the same temperature? 19. What is sublimation? Name two substances which undergo sublimation? 20. What factors are responsible for the change in state of solid carbondioxide when kept exposed to air? Long Answer Questions 21. Compare the properties of solids, liquids and gases in tabular form? 22. What are the characteristics of matter? 23. What do you understand by the term ‘latent heat’? What are the two types of latent heat? 24. Which contain more heat, 1 kg of water at 1000C or 1 kg of steam at 1000C? Give reason for your answer. 25. Draw the ‘states of matter triangle’ to show the interconversion of states of matter. 26. How will you demonstrate that water vapour is present in air? 27. Explain the following: a. Why do gases have neither a fixed shape nor a fixed volume? b. A sponge can be compressed easily, so why do we call sponge a solid? 28. Why latent heat does not cause a rise in temperature of the substance? 29. Why the temperature of boiling water does not rise even though heat is given continuously? 30. What properties of particles decide whether a given substance will exist as a solid, a liquid or a gas? e-mail: kollanarendra@yahoo.com