Chapter 8: A Journey through States of Water Worksheet
Chapter 8: A Journey through States of Water
Worksheet
A. Multiple Choice Questions
1. Which of the following is the gaseous state of water?
(a) Ice
(b) Water
(c) Water vapour
(d) Snow
Answer: (c) Water vapour
2. The conversion of water vapour into liquid water is called:
(a) Evaporation
(b) Condensation
(c) Melting
(d) Freezing
Answer: (b) Condensation
3. The conversion of ice into water is called:
(a) Freezing
(b) Melting
(c) Condensation
(d) Evaporation
Answer: (b) Melting
4. Which process changes liquid water into water vapour?
(a) Freezing
(b) Melting
(c) Evaporation
(d) Condensation
Answer: (c) Evaporation
5. Which factor can increase the rate of evaporation?
(a) Smaller exposed surface
(b) Higher temperature
(c) High humidity
(d) No air movement
Answer: (b) Higher temperature
6. Water droplets appearing on the outside of a cold glass are formed due to:
(a) Melting
(b) Freezing
(c) Condensation
(d) Boiling
Answer: (c) Condensation
7. Which state of water has a fixed shape?
(a) Solid
(b) Liquid
(c) Gas
(d) Water vapour only
Answer: (a) Solid
8. Which state of water takes the shape of its container?
(a) Solid
(b) Liquid
(c) Gas
(d) Ice
Answer: (b) Liquid
9. Evaporation generally produces a:
(a) Heating effect
(b) Cooling effect
(c) Freezing effect
(d) Melting effect
Answer: (b) Cooling effect
10. Which of the following helps wet clothes dry faster?
(a) Still air
(b) Less exposed area
(c) Air movement
(d) High humidity
Answer: (c) Air movement
11. Water in an earthen pot becomes cool mainly because of:
(a) Freezing
(b) Condensation
(c) Evaporation
(d) Melting
Answer: (c) Evaporation
12. The amount of water vapour present in air is called:
(a) Temperature
(b) Humidity
(c) Condensation
(d) Pressure
Answer: (b) Humidity
13. Clouds are formed mainly due to:
(a) Melting
(b) Condensation
(c) Freezing of all water
(d) Boiling
Answer: (b) Condensation
14. The circulation of water between the Earth's surface and atmosphere is called:
(a) Rainfall
(b) Water cycle
(c) Evaporation
(d) Condensation
Answer: (b) Water cycle
15. Which of the following can make evaporation slower?
(a) Higher temperature
(b) Greater air movement
(c) Larger exposed surface
(d) High humidity
Answer: (d) High humidity
B. Fill in the Blanks
1. Ice is the ______ state of water.
Answer: solid
2. Water vapour is the ______ state of water.
Answer: gaseous
3. The conversion of liquid water into water vapour is called ______.
Answer: evaporation
4. The conversion of water vapour into liquid water is called ______.
Answer: condensation
5. The conversion of liquid water into ice is called ______.
Answer: freezing
6. The conversion of ice into liquid water is called ______.
Answer: melting
7. Evaporation causes a ______ effect.
Answer: cooling
8. The amount of water vapour in air is called ______.
Answer: humidity
9. Water vapour condenses around tiny ______ particles to form water droplets in clouds.
Answer: dust
10. The circulation of water between the Earth's surface and atmosphere is called the ______.
Answer: water cycle
C. True or False
1. Ice is the solid state of water.
Answer: True
2. Water vapour is visible at room temperature.
Answer: False
3. Evaporation can take place at room temperature.
Answer: True
4. Condensation changes water vapour into liquid water.
Answer: True
5. Increasing air movement can increase evaporation.
Answer: True
6. High humidity generally makes evaporation faster.
Answer: False
7. Evaporation can produce a cooling effect.
Answer: True
8. A liquid has a fixed shape.
Answer: False
9. Water droplets on the outside of a cold tumbler come from inside the tumbler.
Answer: False
10. Clouds are related to the process of condensation.
Answer: True
D. Match the Following
Column A Column B
1. Melting (a) Gas to liquid
2. Freezing (b) Liquid to gas
3. Evaporation (c) Solid to liquid
4. Condensation (d) Liquid to solid
5. Water cycle (e) Circulation of water
Answers
(c)
(d)
(b)
(a)
(e)
E. Very Short Answer Questions
1. What are the three states of water?
Answer: Solid, liquid and gaseous states.
2. What is evaporation?
Answer: Evaporation is the process in which liquid water changes into water vapour.
3. What is condensation?
Answer: Condensation is the process in which water vapour changes into liquid water.
4. What is melting?
Answer: Melting is the conversion of a solid into a liquid.
5. What is freezing?
Answer: Freezing is the conversion of a liquid into a solid.
6. What is humidity?
Answer: Humidity is the amount of water vapour present in air.
7. Name the solid forms of water found in nature.
Answer: Ice, snow and hail.
8. Why does a wet floor become dry?
Answer: Water on the floor evaporates into the air.
9. Why does a fan help wet clothes dry faster?
Answer: Moving air increases the rate of evaporation.
10. What is the water cycle?
Answer: The circulation of water between the Earth's surface and atmosphere is called the water cycle.
F. Short Answer Questions
1. What happens when ice is heated?
Answer: When ice is heated, it melts and changes from the solid state into liquid water. With further heating, water can change into water vapour.
2. Why do water droplets appear on the outside of a cold tumbler?
Answer: Water vapour present in the surrounding air comes in contact with the cold surface of the tumbler. It loses heat and changes into tiny water droplets through condensation.
3. How does temperature affect evaporation?
Answer: Higher temperature generally increases the rate of evaporation. Water evaporates faster when it receives more heat.
4. How does exposed surface area affect evaporation?
Answer: A larger exposed surface area allows more water to come in contact with air, so evaporation takes place faster.
5. How does air movement affect evaporation?
Answer: Moving air carries away water vapour from the surface. Therefore, increased air movement generally makes evaporation faster.
6. Why does water in a matka remain cool?
Answer: Water seeps through the tiny pores of the earthen pot and evaporates from its outer surface. Evaporation takes heat from the surroundings, producing a cooling effect.
7. Why does sweat cool our body?
Answer: Sweat evaporates from our skin. During evaporation, heat is taken from our body, producing a cooling effect.
8. How are clouds formed?
Answer: Water evaporates and rises into the atmosphere. At greater heights, the air is cooler, so water vapour condenses around tiny dust particles into small water droplets. These droplets come together to form clouds.
G. Long Answer Questions
1. Explain the three states of water.
Answer:- Water exists in three states:
Solid: Ice is the solid state of water. It has a fixed shape and does not flow.
Liquid: Water is the liquid state. It flows and takes the shape of its container.
Gas: Water vapour is the gaseous state. It spreads through the available space and has no fixed shape.
Heating and cooling can change water from one state to another.
2. Explain evaporation and the factors affecting its rate.
Answer:- Evaporation is the process by which liquid water changes into water vapour. It can take place even at room temperature.
The rate of evaporation is affected by:
Exposed surface area: Larger surface area increases evaporation.
Temperature: Higher temperature increases evaporation.
Air movement: Moving air increases evaporation.
Humidity: High humidity slows down evaporation.
These factors explain why clothes dry faster when they are spread out in sunlight and air.
3. Explain condensation with an example.
Answer:- Condensation is the conversion of water vapour into liquid water.
For example, when a cold tumbler is kept in a room, water droplets appear on its outer surface. These droplets are formed because water vapour present in the surrounding air comes in contact with the cold surface and changes into liquid water.
Thus, the water on the outside of the tumbler does not come through the tumbler; it is formed by condensation.
4. Explain the cooling effect of evaporation with examples.
Answer:- Evaporation requires heat. During evaporation, heat is taken from the surroundings, causing a cooling effect.
Examples include:
Sweat evaporates and cools our body.
Water in an earthen pot becomes cool.
Sprinkling water on a floor or roof can make it cooler.
A fan helps sweat and water evaporate faster.
Sanitiser feels cool when it evaporates from our skin.
Thus, evaporation is an important natural cooling process.
5. Explain how clouds and rain are formed.
Answer:- Water from oceans, rivers, lakes and other surfaces evaporates and changes into water vapour. The water vapour rises into the atmosphere. At higher altitudes, the air is cooler, so the water vapour condenses around tiny dust particles and forms small water droplets.
Many small droplets come together to form clouds. When the droplets become large and heavy, they fall towards the Earth as rain. Depending on conditions, water may also fall as hail or snow.
6. Explain the water cycle.
Answer:- The continuous circulation of water between the Earth's surface and atmosphere is called the water cycle.
The main steps are:
Evaporation → Condensation → Cloud formation → Rain/Snow/Hail → Water flows back to water bodies → Evaporation again
Water from oceans and other water bodies evaporates. The vapour rises, cools and condenses to form clouds. Water then returns to Earth as rain, snow or hail. It eventually flows back to water bodies and the cycle continues.
7. Why should we use water wisely and protect it?
Answer:- Water is essential for all living beings. Only a small portion of Earth's water is directly usable by us. As the population increases, the demand for water also increases.
- Therefore, we should:
- Avoid wasting water.
- Use water carefully.
- Prevent pollution of water sources.
- Protect water resources.
- Understand that water is a shared responsibility.
The statement “Water is our responsibility before it is our right” reminds us that we must conserve and protect water for ourselves and future generations.
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