CBSE Class 6 Science Chapter 14 Water NCERT Solutions
This chapter delves into the fundamental concepts of water, a vital resource for life. Students will explore the different states of water and the processes of evaporation and condensation. The NCERT Solutions for Class 6 Science Chapter 14 provide clear explanations and step-by-step answers to exercises covering topics like the water cycle, sources of water, and the impact of weather on water. These solutions are designed to help students understand the scientific principles behind everyday water-related phenomena. By working through these problems, students will reinforce their learning and build a strong foundation in basic earth science concepts, aiding in their exam preparation and fostering a deeper appreciation for water conservation.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 6 |
| Subject | Science |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 14 |
Chapter summary
Chapter 14, 'Water,' for Class 6 Science focuses on understanding the properties and behavior of water. The NCERT Solutions cover key processes such as evaporation and condensation, explaining how water changes states. It also touches upon the effects of weather phenomena like drought and floods. The exercises are designed to reinforce these concepts through fill-in-the-blanks, true/false statements, and application-based questions, ensuring students grasp the importance of water and its conservation.
Learning outcomes
- Understand the processes of evaporation and condensation.
- Identify factors affecting the rate of evaporation.
- Explain the formation of water droplets on cold surfaces.
- Recognize the causes and effects of drought and floods.
- Differentiate between true and false statements related to water.
- Apply scientific principles to explain everyday observations about water.
Topics covered
Paper topics
- Water
- Evaporation
- Condensation
- Water Vapour
- Drought
- Flood
- Water Cycle (implied)
- States of Water (implied)
Important topics
- Evaporation
- Condensation
- Factors affecting evaporation
- Causes of drought and flood
- Everyday examples of evaporation and condensation
PDF preview
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Questions and Solutions
Question 1
(a) The process of changing of water into its vapour is called ______.
(b) The process of changing water vapour into water is called ______.
(c) No rainfall for a year or more may lead to _____ in that region.
(d) Excessive rains may cause _____.
(a) The process of changing of water into its vapour is called evaporation. This is when liquid water absorbs enough heat energy to transform into a gaseous state (water vapour).
(b) The process of changing water vapour into water is called condensation. This occurs when water vapour in the air cools down and changes back into liquid water droplets.
(c) No rainfall for a year or more may lead to drought in that region. A drought is a prolonged period of abnormally low rainfall, leading to a shortage of water.
(d) Excessive rains may cause flood. Floods happen when there is an overflow of a large amount of water beyond its normal confines, often due to heavy or prolonged rainfall.
Question 2
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.
(a) Water drops appear on the outer surface of a glass containing cold water. This is due to condensation. The cold surface cools the water vapour in the surrounding air, causing it to turn into liquid water droplets.
(b) Steam rising from wet clothes while they are ironed. This is due to evaporation. The heat from the iron increases the temperature, speeding up the process of water turning into vapour.
(c) Fog appearing on a cold winter morning. This is due to condensation. Water vapour in the air cools down near the ground on cold mornings and forms tiny water droplets, creating fog.
(d) Blackboard dries up after wiping it. This is due to evaporation. The water spread on the blackboard turns into water vapour and mixes with the air, leaving the blackboard dry.
(e) Steam rising from a hot girdle when water is sprinkled on it. This is due to evaporation. The high temperature of the girdle causes the sprinkled water to rapidly turn into steam (water vapour).
Question 3
(a) Water vapour is present in air only during the monsoon.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour, is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
(a) Water vapour is present in air only during the monsoon. False. Water vapour is present in the air all the time, though the amount can vary.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil. False. Water also evaporates from soil, plants, and other moist surfaces.
(c) The process of water changing into its vapour, is called evaporation. True. This is the definition of evaporation.
(d) The evaporation of water takes place only in sunlight. False. Evaporation can happen at any temperature, although it happens faster with more heat (like sunlight).
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler. True. As air rises, it cools, and the water vapour in it condenses to form clouds, which are made of tiny water droplets or ice crystals.
Question 4
Yes, spreading your school uniform near an anghiti or heater would help it dry quickly. This is because the rate of evaporation increases with an increase in temperature. An anghiti or heater provides heat, raising the temperature of the surrounding air and the uniform. This higher temperature causes the water in the uniform to evaporate more rapidly into the air, thus drying it faster.
Question 5
The puddle of water around the cooled bottle is formed due to condensation. The air around us contains water in the form of invisible water vapour. When this warm, moist air comes into contact with the cold outer surface of the refrigerator bottle, the air cools down. As the air cools, it can no longer hold as much water vapour, and the excess vapour turns into tiny liquid water droplets on the surface of the bottle. This process is called condensation, and these droplets accumulate to form the puddle you observe.
Question 6
When people breathe out, the air they exhale is warm and moist, meaning it contains a significant amount of water vapour. When this warm, moist air comes into contact with the relatively cooler surface of the spectacle lenses, the water vapour in the exhaled air cools down. This cooling causes the water vapour to condense into tiny liquid water droplets on the surface of the glasses, making them appear wet. This is the same principle as water droplets forming on a cold glass.
Common mistakes
- Confusing evaporation with condensation.
- Assuming evaporation only occurs in sunlight or specific conditions.
- Not considering soil as a source of evaporation.
- Incorrectly identifying the cause of water droplets on cold surfaces.
Revision tips
- Review the definitions of evaporation and condensation thoroughly.
- Pay close attention to the 'True/False' questions to solidify understanding of conditions for water processes.
- Use the examples of the cold bottle and spectacles to visualize condensation.
- Relate the concepts of drought and floods to the importance of rainfall and water management.
Practice MCQs
Q1. What is the process of changing water into its vapour called?
Explanation: Evaporation is the process where liquid water turns into water vapour or gas.
Q2. When water vapour changes back into liquid water, it is called:
Explanation: Condensation is the process where water vapour in the air cools down and changes back into liquid water droplets.
Q3. What can happen in a region if there is no rainfall for a year or more?
Explanation: A prolonged lack of rainfall leads to drought, a condition of severe water shortage.
Q4. Which process causes a wet blackboard to dry up?
Explanation: The water from the wet blackboard turns into vapour and disappears into the air through evaporation.
Q5. Water drops appearing on the outside of a cold glass are due to:
Explanation: The cold surface of the glass cools the water vapour in the surrounding air, causing it to condense into liquid water droplets.
Frequently asked questions
What are the main processes discussed in Chapter 14 of Class 6 Science?
Chapter 14 primarily discusses the processes of evaporation (water changing into vapour) and condensation (water vapour changing back into water).
What causes water droplets to form on the outside of a cold glass?
Water droplets form on a cold glass due to condensation. Water vapour present in the surrounding air cools down when it comes into contact with the cold surface of the glass and turns into liquid water.
How does drying clothes relate to evaporation?
When clothes are dried, the water in them evaporates. This means the water turns into water vapour and mixes with the air. Factors like temperature and wind speed affect how quickly this happens.
What is the difference between drought and flood?
Drought is caused by a lack of rainfall, leading to water scarcity. A flood, on the other hand, is caused by excessive rainfall or other factors leading to an overflow of water.
Are the NCERT Solutions for Class 6 Science Chapter 14 helpful for exams?
Yes, these solutions provide clear explanations and answers to the chapter's exercises, helping students understand key concepts like evaporation and condensation, which are crucial for exam preparation.
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