Q1. Fill in the blanks.

                          i.        Water vapor gets added to air by ______________and____________.

                         ii.        The circulation of water between ocean and land is known as the________________.

                        iii.        __________covers more than two thirds of the earth’s surface.

                        iv.        In atmosphere water is present in huge quantities as ___________and__________.

                         v.        Water present in ocean and sea is _______for drinking.


Q2. True/False

                          i.        Water evaporates faster on hot summer day compared to cloudy day. ______

                         ii.        Excessive rain in an area leads to droughts. _______

                        iii.        Water is a natural resource. _______

                        iv.        About one thirds of the Earth is covered with water. _______

                        v.        Heating is essential to convert water into its vapor. _______


Q3. Which is the purest form of natural water?


Q4. Name the process involved in the formation of clouds.


Q5. Why water disappears from wet clothes as they dry up?


Q6. What are the different forms of water exists on earth?


Q7. How much water is lost through transpiration by wheat plants that give us one kilogram of wheat?


Q8. Define water cycle.


Q9. How water enters the air?


Q10. Where do water in rivers and lakes come from?


Q11. Define condensation.


Q12. What do you understand by conservation of water?


Q13. Why water spilled on a floor dries up after some time?


Q14. Define transpiration.


Q15. What is evaporation?


Q16. Why is water in seas and oceans saline?


Q17. Why we rarely notice water vapor from a bucket full of water?


Q18. Why does a mist of tiny water droplets form when we breathe out on a window in winter?

Last modified: Thursday, 3 January 2019, 9:42 PM