RBSE Solutions for Class 6 Science Chapter 14 Water

Rajasthan Board RBSE Solutions for Class 6 Science Chapter 14 Water Textbook Exercise Questions and Answers.

RBSE Class 6 Science Solutions Chapter 14 Water

RBSE Class 6 Science Water InText Questions and Answers

Page 137

Question 1. 
Boojho wonders whether people living in different regions of our country get the same amount of water. Are there regions where people do not get adequate amount of water? How do they manage?
Answer:
No, the people living in different regions of our country do not get the same amount of water. Yes, there are many regions where people do not get adequate amount of water such as slums, rural and backward areas, etc. They do not have proper safe drinking water. They use less water, they go far off places to fetch water. Sometimes they manage water by water tanks which are provided to their area by local government. Hence, they manage but face difficulties.

Page 137

Question 2. 
Boojho wants you to imagine a day in your life when water supply through taps is not available. So, you have to fetch it yourself from a far away place. Would you use the same amount of water as on any other day? 
Answer:
No, we would not use the same amount of water as we used to.

Page 139

Question 3. 
Boojho has been reading about transpiration. He asked himself - how much water is lost through transpiration by wheat plants that give us one kilogram of wheat? He found out that this is nearly 500 litres, that is, roughly 25 large sized buckets full of water. Can you now imagine the amount of water lost by plants of all the forests, crops and grasslands together?
Answer:
We cannot imagine it in quantity but we can say that a lot of water is lost through transpiration by all types of vegetations.

Page 140

Question 4. 
Paheli has noticed dew on leaves of grass on winter mornings. Did you notice something similar on leaves or metals surfaces like iron grills and gates on a cloudy morning? Is this also due to condensation? Do you see this happening on hot summer mornings? 
Answer:
In winter morning, more condensation takes place as the water vapour which is present in the atmosphere convert into water droplets through the process of condensation. This causes more water drops on the objects which are in the open areas such as iron grills, gates, etc. In hot summer morning, this does not happen as the atmosphere is not that cool.

Page 141

Question 5. 
Boojho has noticed fog near the ground in winter mornings. He wonders, if this is also condensation of water vapour near the ground. What do you think?
Answer:
Yes, we also think that fog near the ground in winter mornings is also due to condensation.

RBSE Class 6 Science Water Textbook Questions and Answers

Question 1. 
Fill up the blanks in the following:
(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 rain may cause ..................................
Answer:
(a) vapourization 
(b) condensation
(c) drought 
(d) flood.

Question 2. 
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 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.
Answer:
(a) Condensation 
(b) Evaporation
(c) Condensation 
(d) Evaporation 
(e) Evaporation.

Question 3. 
Which of the following statements 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 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.
Answer:
(a) False 
(b) False 
(c) True 
(d) False
(e) True.

Question 4. 
Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?
Answer:
Yes, spreading wet uniform near an anghiti or heater will help us to dry uniform. Heater or an anghiti both are source of heat which will vaporize the water of the wet uniform and help in drying.

Question 5. 
Take out a cooled bottle of water from refrigerator and keep it on a table. After sometime you notice a droplets of water around it. Why?
Answer:
Since the water bottle is at a very low temperature in the refrigerator. It has cool surface when this water bottle exposed to moist air, the vapour in the air strikes the cool surface and gets condensed to form water droplets. The condensed water droplets stick around the water bottle and can be seen as a droplets of water around it.

Question 6. 
To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
Answer:
The air which we breathe out contains water vapour. The water vapour condensed on spectacles and changes into small droplets of water. Now, it is easy to clean glasses as they have some water droplets on them.

Question 7. 
How are clouds formed?
Answer:

1. The water present on the Earth’s surface evaporates due to heating effect of sunlight.
2. This water vapour reaches high in the atmosphere. The air becomes so cool that it condenses water vapour into tiny drops of water called droplets.
3. These tiny water droplets come together to from larger sized drops of water and form clouds.
4. Hence, clouds are formed by the condensation of water vapour at high altitude.

Question 8. 
When does a drought occur?
Answer:
When there is absence of rainfall or little rainfall for a long period of time then it creates a scarcity of water in that area The soil also continues to lose water by evaporation and transpiration and becomes dry and ground water may also become scarce which leads to drought.