This chapter of NCERT Class 6 Chapter 8: A Journey Through States of Water, helps young learners explore the states of water, including evaporation, condensation, melting, freezing, and the water cycle, using real-life examples and experiments. We at Bodhiclasses, help you learn in the most effective manner through a lot of explanations and detailed question answers.
Multiple Choice Questions (MCQs): A Journey Through States of Water
1. Water changes into vapour by the process of:
(a) Freezing
(b) Melting
(c) Condensation
(d) Evaporation ✅
2. The process of water vapour turning into liquid water is called:
(a) Melting
(b) Condensation ✅
(c) Evaporation
(d) Sublimation
3. Which of the following helps in increasing the rate of evaporation?
(a) Closed room
(b) Humid air
(c) Fan ✅
(d) High pressure
4. Which form of water exists in clouds?
(a) Solid
(b) Liquid droplets and vapour ✅
(c) Gas only
(d) Ice crystals only
5. Ice is the _______ form of water.
(a) solid ✅
(b) liquid
(c) gas
(d) vapour
6. Which of the following activities shows evaporation?
(a) Water turning into ice
(b) Clothes drying in the sun ✅
(c) Condensation on mirror
(d) Dew formation
7. Water boils and changes into steam at:
(a) 0°C
(b) 50°C
(c) 80°C
(d) 100°C ✅
8. Water droplets on the outside of a cold glass are due to:
(a) Condensation ✅
(b) Evaporation
(c) Freezing
(d) Melting
9. Which of these is NOT a factor affecting evaporation?
(a) Temperature
(b) Wind
(c) Surface area
(d) Colour of water ✅
10. Which process plays a key role in cloud formation?
(a) Melting
(b) Condensation ✅
(c) Boiling
(d) Sublimation
True/False Questions: A Journey Through States of Water
1. Water vapour is visible to the naked eye. – ❌ False
2. Melting is the process of a solid turning into a liquid. – ✅ True
3. Fans slow down the rate of evaporation. – ❌ False
4. Dew on grass is formed due to condensation. – ✅ True
5. Ice has a definite shape. – ✅ True
6. Water can only evaporate when heated to 100°C. – ❌ False
7. Snow is a solid form of water in nature. – ✅ True
8. Cooling causes water to evaporate. – ❌ False
9. The water cycle is a continuous process. – ✅ True
10. Water changes its state due to temperature changes. – ✅ True
One Mark Questions (Very Short Answer): A Journey Through States of Water
1. What is the gaseous form of water called?
Ans: Water vapour.
2. At what temperature does water freeze?
Ans: 0°C.
3. What is the process of liquid water turning into vapour called?
Ans: Evaporation.
4. Give one example of water in solid form in nature.
Ans: Snow.
5. What causes water to evaporate faster?
Ans: Heat or increased temperature.
6. Name the process by which steam turns into water.
Ans: Condensation.
7. What is the solid form of water called?
Ans: Ice.
8. What do you call the process of changing a solid to a liquid?
Ans: Melting.
9. What is the process by which rain is formed?
Ans: Condensation and precipitation.
10. How does dew form on leaves in the morning?
Ans: Due to condensation of water vapour on cold surfaces.
11. Which factor increases evaporation?
Ans: Wind or airflow.
12. Name one method to cool down hot water.
Ans: Keep it in a cool place or refrigerator.
13. What is precipitation?
Ans: Rainfall, snowfall, or hail falling from clouds.
14. What happens to water when it is frozen?
Ans: It turns into ice.
15. Why do wet clothes dry faster under a fan?
Ans: Fan increases the rate of evaporation.
16. What is humidity?
Ans: The amount of water vapour present in air.
17. What is the source of heat in the natural water cycle?
Ans: The Sun.
18. Can water vapour condense into water at room temperature?
Ans: Yes, on a cold surface.
19. Why is natural grass cooler than plastic grass?
Ans: Because of evaporation from water in real grass.
20. Is the water cycle reversible or one-way?
Ans: Reversible and cyclic.
Two Mark Questions (Short Answer)
1. Define evaporation and give one real-life example.
Ans: Evaporation is the process of a liquid turning into gas. Example: Clothes drying in sunlight.
2. Explain condensation with an example.
Ans: Condensation is the change of gas into liquid. Example: Water droplets forming on the outer side of a cold glass.
3. How do temperature and wind affect evaporation?
Ans: Higher temperature and strong winds increase the rate of evaporation.
4. Why is the cooling effect observed during evaporation?
Ans: Evaporation absorbs heat from the surroundings, causing a cooling effect.
5. State the three states of water and one example of each.
Ans: Solid – Ice, Liquid – Water, Gas – Water vapour.
6. What causes clouds to form in the sky?
Ans: Water vapour cools and condenses into tiny droplets, forming clouds.
7. How does an earthen pot keep water cool?
Ans: Water seeps through the pot’s pores and evaporates, causing cooling.
8. What is the role of dust particles in cloud formation?
Ans: Water vapour condenses around dust particles to form droplets.
9. Mention two ways to slow down evaporation.
Ans: Reduce temperature and keep the liquid in a closed container.
10. How is the water cycle helpful to humans?
Ans: It ensures a continuous supply of fresh water through rain and replenishes groundwater.
Higher Order Thinking Skills (HOTS) Questions
1. Why do people sprinkle water on roads and rooftops during summer?
Ans: Sprinkled water evaporates and cools the surface by absorbing heat, reducing the surrounding temperature.
2. What would happen if there was no evaporation on Earth?
Ans: The water cycle would stop, no cloud formation or rain, leading to drought and water shortage.
3. If you keep water in a wide bowl and in a narrow bottle, which one will evaporate faster and why?
Ans: Water in the wide bowl will evaporate faster due to a larger exposed surface area.
4. How would you demonstrate that water vapour is present in the air?
Ans: By holding a cold metal surface in air and observing water droplets forming on it.
5. Imagine the Earth has no mountains or trees. How will it affect the water cycle?
Ans: It would reduce condensation, disrupt rainfall patterns, and lead to extreme weather, affecting water availability.
