MCQ | NCERT Class 9 Science | Chapter 8: A Journey through States of Water
Q1. In which three states can water commonly exist?
(a) Solid, liquid and gas
(b) Solid, metal and gas
(c) Liquid, metal and vapour
(d) Solid, liquid and metal
Answer: (a) Solid, liquid and gas
Q2. Which of the following is the solid state of water?
(a) Steam
(b) Water vapour
(c) Ice
(d) Rain
Answer: (c) Ice
Q3. Which of the following is the gaseous state of water?
(a) Ice
(b) Water
(c) Water vapour
(d) Snow
Answer: (c) Water vapour
Q4. What happens when an ice cube is left on a table for some time?
(a) It changes into water
(b) It changes directly into soil
(c) It becomes hotter and remains ice
(d) It disappears without changing its state
Answer: (a) It changes into water
Q5. Ice and water are
(a) different substances
(b) two forms of the same substance
(c) unrelated materials
(d) different elements
Answer: (b) two forms of the same substance
Q6. The change of water from liquid to solid is called
(a) melting
(b) freezing
(c) evaporation
(d) condensation
Answer: (b) freezing
Q7. The change of ice from solid to liquid is called
(a) freezing
(b) condensation
(c) melting
(d) evaporation
Answer: (c) melting
Q8. What is evaporation?
(a) The change of liquid water into water vapour
(b) The change of ice into water
(c) The change of water vapour into ice
(d) The change of water into soil
Answer: (a) The change of liquid water into water vapour
Q9. Where does evaporation take place?
(a) Only at the boiling point
(b) From the surface of a liquid
(c) Only inside a refrigerator
(d) Only during rainfall
Answer: (b) From the surface of a liquid
Q10. Which of the following is an example of evaporation?
(a) Wet clothes drying in the air
(b) Ice becoming water
(c) Water becoming ice in a freezer
(d) Water vapour forming droplets
Answer: (a) Wet clothes drying in the air
Q11. What happens to water in a puddle on a warm day?
(a) It may gradually evaporate
(b) It always freezes
(c) It changes into ice immediately
(d) It becomes soil
Answer: (a) It may gradually evaporate
Q12. What is condensation?
(a) Change of water vapour into liquid water
(b) Change of liquid water into vapour
(c) Change of ice into water
(d) Change of water into ice only
Answer: (a) Change of water vapour into liquid water
Q13. Which of the following is an example of condensation?
(a) Water droplets forming on the outside of a cold glass
(b) Wet clothes drying
(c) Ice melting
(d) Water boiling
Answer: (a) Water droplets forming on the outside of a cold glass
Q14. Why do water droplets sometimes form on the outside of a cold glass containing a cold drink?
(a) Water vapour in the surrounding air condenses on the cold surface
(b) Water passes through the glass
(c) The glass produces water
(d) The drink evaporates through the glass
Answer: (a) Water vapour in the surrounding air condenses on the cold surface
Q15. What happens to the rate of evaporation when the surface area of water increases?
(a) It generally increases
(b) It always becomes zero
(c) It decreases to zero
(d) It remains impossible to change
Answer: (a) It generally increases
Q16. Why do wet clothes usually dry faster on a windy day?
(a) Moving air helps evaporation
(b) Wind changes water into ice
(c) Wind adds water to the clothes
(d) Wind stops evaporation
Answer: (a) Moving air helps evaporation
Q17. Why do clothes generally dry faster on a hot day than on a cool day?
(a) Higher temperature generally increases the rate of evaporation
(b) Heat stops evaporation
(c) Water freezes faster
(d) Condensation increases completely
Answer: (a) Higher temperature generally increases the rate of evaporation
Q18. Why do clothes dry more slowly on a humid day?
(a) The air already contains a large amount of water vapour
(b) The clothes become colder than ice
(c) Water cannot evaporate at all
(d) Humidity turns water into ice
Answer: (a) The air already contains a large amount of water vapour
Q19. Why does evaporation of sweat help cool our body?
(a) Evaporation takes heat from the body
(b) Sweat increases body temperature
(c) Sweat turns directly into ice
(d) Evaporation produces heat in the body
Answer: (a) Evaporation takes heat from the body
Q20. How are clouds formed?
(a) Water vapour rises, cools and condenses into tiny water droplets
(b) Ice melts directly in the sky
(c) Rivers rise into the sky as liquid water
(d) Clouds are made only from dust
Answer: (a) Water vapour rises, cools and condenses into tiny water droplets
Q21. What causes rain to fall from clouds?
(a) Water droplets combine and become heavy enough to fall
(b) Clouds become solid rocks
(c) Water vapour disappears completely
(d) The Sun pushes the clouds downward
Answer: (a) Water droplets combine and become heavy enough to fall
Q22. Which process is an important part of the water cycle?
(a) Evaporation
(b) Condensation
(c) Rainfall
(d) All of these
Answer: (d) All of these
Q23. What is the water cycle?
(a) The continuous movement of water between Earth’s surface and the atmosphere
(b) The process of making drinking water only
(c) The movement of water only through rivers
(d) The freezing of all water on Earth
Answer: (a) The continuous movement of water between Earth’s surface and the atmosphere
Q24. Which sequence correctly represents common changes in the water cycle?
(a) Evaporation → Condensation → Rainfall
(b) Freezing → Melting → Burning
(c) Condensation → Melting → Burning
(d) Rainfall → Burning → Freezing
Answer: (a) Evaporation → Condensation → Rainfall
Q25. Which statement correctly describes the different states of water?
(a) Water can change from one state to another when conditions such as temperature change
(b) Water exists only as a liquid
(c) Ice and water are completely different substances
(d) Water vapour cannot change back into liquid water
Answer: (a) Water can change from one state to another when conditions such as temperature change
