Available Answers

1. 1.

   Choose the correct answer.

   1. Potable water is the water which is used for 
      1. agriculture
      2. industrial purpose
      3. drinking
      4. cooking
   2. Which of the following is a natural cause of water pollution?
      1. Weathering
      2. Oil spill
      3. Domestic sewage
      4. Agricultural waste
   3. A liquid which dissolves other substances in it is called 
      1. solute
      2. solvent
      3. solution
      4. soluble
   4. Polluted water can cause
      1. gastroenteritis
      2. diarrhoea
      3. cholera
      4. all of these
   5. Which of these sources of water contains dissolved salts beneficial for health?
      1. River water
      2. Spring water
      3. Rainwater
      4. Ocean water
2. 2.

   Fill in the blanks:

   1. Solubility of a substance generally _________________ with increase in temperature.
   2. the water which is fit and safe for drinking is called _________________ water.
   3. Oil spills from huge tankers is the major cause of _________________.
   4. Gases like oxide of _________________ and _________________ dissolve in rainwater causing acid rain.
   5. Water is called a _________________ solvent.
   6. Water help in the _________________ of seeds and growth of plants.
   7. Water regulates the temperature of our body by the process of _________________.
   8. A homogeneous mixture of a solute in a solvent is called a _________________.
3. 3.

   Match the following:

   Column A	Column B
   1. Potable water	a. Harvesting
   2. Water table	b. Three-fourth of water
   3. Earth's surface	c. Waterborne disease
   4. Rainwater	d. Groundwater
   5. Cholera	e. Drinking water

    

4. 4.

   What is acid rain?
5. 5.

   Water is known as a universal solvent. Explain.