Page 93 - ICSE Chemistry 6

5. Water regulates the body ____________ of plants and animals.
6. Water acts as a ____________ in powerhouses which generate electricity.
7. Solubility of a solute ____________ on increasing the temperature.
8. A solu on is said to be _________________ when it can dissolve more of the solute at a par cular
temperature.
9. ____________ is an infec on in the small intes ne caused by a bacterium.

10. The addi on of unwanted and harmful substances to water is called _____________________.

B. Iden fy the error in the given statements. Circle the incorrect word and write the correct word in
the blank.
1. Surface water is the purest form of water. __________________
2. Water exists as a free-fl owing liquid in a gaseous state. __________________

3. Plants lose water con nuously through leaves during evapora on. __________________
4. S rring the solu on decreases the solubility of the solute in the solvent. __________________

5. The forma on of a solu on is a chemical change. __________________
6. Saline water is fi t for consump on. __________________
7. Typhoid is caused by Hepa s A virus. __________________

8. Aera on is the process of sterilizing water using ozone. __________________
9. Osmosis is a method of water purifi ca on in which water is forced out
of the waste through a semipermeable membrane by applying pressure. __________________
10. Filtered water is used for preparing solu ons for medicinal purposes. __________________

C. Choose the correct op on.
1. Water is essen al for ______________.
(a) diges on of food (b) excre on of waste
(c) germina on of seed (d) all of these

2. Water is used _______________.
(a) in agriculture (b) as a coolant in powerhouses
(c) for recrea on and sport ac vi es (d) all of these
3. The pool of water that is obtained by digging the soil ll the impervious layer is called ______________.
(a) spring water (b) well water (c) groundwater (d) rainwater
4. Which of the following substances are insoluble in water?
(a) Sand and salt (b) Sugar and wood (c) Wood and sand (d) Sugar and salt
5. Which of these techniques is the easiest and the most recommended purifi ca on technique?
(a) Sedimenta on and decanta on (b) Filtra on
(c) Chlorina on (d) Boiling

6. Which of these is not a cause of water pollu on?
(a) Discharge of domes c waste
(b) Addi on of chlorine
(c) Leakage of oil during drilling and shipping opera ons
(d) Discharge of wastes from nuclear plants

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