NCERT solution for class 6 || science || chapter 14 - Water

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NCERT solution for class 6 || science || chapter 14 -  Water

Chapter 14 -Water  

Exercise 

Q1. Fill up  the blanks in the following 

a) The process of changing of water into its vapour is called evaporation

b) The process of changing water vapour into water is called condensation 

c) No rainfall for a year or more may lead to drought in that region .

d) Excessive rain may cause floods .

Q2. State for each of the following whether it is  due to evaporation or condensation  .

a) Water drops appear on the outer surface of  a glass containing cold water.

b) Steam rising from wet clothes while they are iron 

c) Fog appearing on a cold winter morning 

d) Blackboard dries up after wiping it 

e) Steam rising from ala hot girdle when water is sprinkled on it .

Answer - 

a) Condensation 

b) Evaporation 

c) Condensation 

d) Evaporation 

e) Evaporation 

Q3. Which of the following statement are true 

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 layer of the air  where it is cooler 

Answer- 

a) false 

b) false 

c) true 

d) false 

e) true 

Q4. Suppose you want to dry your school uniform quickly would spreading it near and anghiti or heater help if yes ?how? 

Answer- Yes it is helpful to spreading it near to the anghiti or heater because It helped us to evaporate the water from the clothes and it becomes quickly dry

Q5. Take out a cold water of water from refrigerator and keep it on a table after sometime you notice attributes of water around it why? 

Answer- Because the atmospheric water vapours come in contact with cold water bottle and it become cold and convert into water droplets is droplet deposited on the walls of the bottle

Q6. To clean their spectacles  people often breath  out on glasses to make them wet explain why the glasses become wet?  

Answer- Because when we breathe out we exhale the carbon dioxide gas with some water vapour and when  the water vapour come in contact with spectacles and outer cold atmosphere it becomes cool and condense and form a water droplet on spectacles

Q7. How are clouds formed ?

Answer - Water evaporates in summer season from the water bodies like sea, ocean, pond, river , soil etc and it in the form of water vapour and goes in upward direction up to certain height then it condenced and convert into water droplets this water droplets accumulated and form a clouds . 

Q8 When does  the drought occurs?  

Answer. - Generally water is mantain  the surface of soil with the help of water cycle but the evaporation of the water takes place  continuously but there is no rainfall in a particular area then such condition creates draught