Assessment Science Class 7 Unit # 5   Water
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1. The water covers our earth surface about: *
2 points
2. Water freezes at ______ Celsius: *
2 points
3. Water boils at________ Celsius: *
2 points
4. How long human being can survive without  food? *
2 points
5. How long human being can survive without water: *
2 points
6. Water makes up ______ percent of our blood *
2 points
7. Water makes up _______ % of our brain *
2 points
8. What percentage of water is found in the ocean? *
2 points
9. Major gases dissolved in ocean water EXCEPT: *
2 points
10. What is the percentage of fresh water on the earth surface? *
2 points
11. Most of the fresh water is found in: *
2 points
12. The top level of underground water is called: *
2 points
13. The cause of acid rain is: *
2 points
14. The major source of water pollutions is/are: *
2 points
15. The method to remove the suspended particles from water is: *
2 points
16. ______ is used to remove suspended and undissolved impurities from water. *
2 points
17. The water which gives rich lather with soap is called: *
2 points
18. The water is heated to convert into steam. Then steam is cooled down into water. This water is called: *
2 points
19. It makes the water germicidal and people use this water for skin diseases. *
2 points
20. Th potential energy of water is used to move propellers of turbines. Turbines in turn run generators that produce electricity. This electricity is known as: *
2 points
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