Class 9 Practice Level 1 – Matter in Our Surrounding Leave a Comment / By Symmetric Angles / June 4, 2024 Class 9 Practice Level 1 - Matter in Our Surrounding Total questions: 40 1. Which of the following is the process of a solid changing directly into a gas? Condensation Freezing Sublimation Melting None 2. What state of matter has a definite shape and volume? Solid Liquid Gas Plasma None 3. What happens to the particles of a substance when it melts? They move closer together They move further apart They stay in place They move randomly None 4. Which state of matter has neither a definite shape nor a definite volume? Solid Liquid Gas Plasma None 5. What is the process of a liquid changing into a gas called? Condensation Freezing Melting Evaporation None 6. Which factor does not affect the rate of evaporation? Temperature Surface area Humidity Color None 7. What is the process of a gas changing into a liquid called? Evaporation Freezing Melting Condensation None 8. What is the boiling point of water at sea level? 50°C 100°C 150°C 200°C None 9. At what temperature does water freeze? 0°C 50°C 100°C -10°C None 10. What is the melting point of ice? 0°C 50°C 100°C -10°C None 11. Which of the following substances undergoes sublimation? Ice Dry ice (solid COâ‚‚) Water Salt None 12. What happens to the pressure of a gas if its volume decreases while keeping temperature constant? Pressure increases Pressure decreases Pressure remains the same Pressure becomes zero None 13. What happens to the boiling point of water at higher altitudes? Increases Decreases Remains the same First increases, then decreases None 14. What happens to the temperature of a substance during the phase change? It increases It decreases It remains constant It fluctuates None 15. Which of the following is an example of a liquid turning into a gas at room temperature? Boiling water Evaporation of water from a pond Melting of ice Freezing of water None 16. Which of the following conditions is most likely to cause condensation? High temperature and high humidity Low temperature and low humidity High temperature and low humidity Low temperature and high humidity None 17. When ice melts to form water, what type of change occurs? Physical change Chemical change Both physical and chemical change Neither physical nor chemical change None 18. Which of the following is true about the particles in a solid? They move freely They are packed closely together They are far apart They are randomly arranged None 19. Which of the following is true about liquids? They have a fixed shape They have a fixed volume They are highly compressible They cannot flow None 20. Which of the following is true about gases? They have a fixed shape They have a fixed volume They fill their container completely They are incompressible None 21. Which state of matter has the highest density? Solid Liquid Gas Plasma None 22. Which of the following factors increases the rate of evaporation? Decrease in temperature Increase in humidity Increase in wind speed Decrease in surface area None 23. Which process involves water changing from a liquid to a solid? Melting Boiling Evaporation Freezing None 24. Which of the following is not a physical change? Melting of ice Boiling of water Burning of paper Dissolving sugar in water None 25. What is the melting point of ice in degrees Celsius? 0°C 32°C 100°C 212°C None 26. Which process involves a liquid changing into a gas at its boiling point? Evaporation Condensation Freezing Boiling None 27. Which of the following processes requires the absorption of heat? Freezing Condensation Evaporation Deposition None 28. In which state of matter do particles have the highest kinetic energy? Solid Liquid Gas Plasma None 29. Which of the following involves a change from liquid to solid? Condensation Evaporation Freezing Melting None 30. Which of the following is a characteristic property of solids? Indefinite shape and volume Definite shape and volume Definite shape but indefinite volume Indefinite shape but definite volume None 31. Which state of matter has a definite volume but no definite shape? Solid Liquid Gas Plasma None 32. Which of the following states of matter has neither a definite shape nor a definite volume? Solid Liquid Gas Plasma None 33. Which of the following factors increases the rate of diffusion? Decreasing temperature Decreasing surface area Increasing temperature Increasing the size of particles None 34. What happens to the particles of a substance when it changes from a solid to a liquid? They lose energy and move closer together They gain energy and move further apart They stop moving They become larger None 35. Which of the following increases the rate of evaporation? Increasing humidity Decreasing temperature Increasing surface area Decreasing surface area None 36. What is the term for the heat energy required to change a substance from a solid to a liquid without changing its temperature? Latent heat of fusion Latent heat of vaporization Specific heat capacity Sensible heat None 37. What is the boiling point of water at sea level? 50°C 90°C 100°C 150°C None 38. Which of the following substances undergoes sublimation? Ice Sodium chloride Naphthalene Sugar None 39. What happens to the temperature of a substance during freezing? It increases It decreases It remains constant It fluctuates None 40. Which of the following is an example of plasma? Water vapor Neon lights Ice Liquid nitrogen None 1 out of 40 Time's up