Available Answers

1. 1.

   Choose and write the correct answer(MCQs):

   1. Pollute air produces many bad effect on:
      1. living things 
      2. non-livings things 
      3. living and non-living things 
      4. weather
   2. Plants help to reduce excess of:
      1. oxygen
      2. nitrogen
      3. hydrogen 
      4. carbon dioxide
   3. _____________ causes extensive harm to soil, water resources, forests and human health:
      1. greenhouse effect
      2. acid rain 
      3. water
      4. oxygen
   4. Our body contains more than:
      1. 70% of water
      2. 50% of water 
      3. 30% of water
      4. 90% of water
   5. Difference materials are carried by:
      1. wind
      2. rain
      3. air
      4. water
2. 2.

   Fill in the blanks:

   1. ___________ is a mixture of several gases.
   2. All the ___________ need air.
   3. Air pollution has caused thinning of the protective ___________.
   4. Industries release large amount of ___________ and ___________ into the atmosphere.
   5. People use fuels like ___________, ___________ and ___________ to cook food.
   6. Dust present in air causes diseases like ___________.
   7. The sources of ___________ are difficult to control.
   8. The ___________ is as pure as distilled water.
   9. The polluted water is ___________ for drinking.
3. 3.

   Write T for true or F for false :

   1. The gases present in the atmosphere air can be separated for different purposes.
   2. Smoke, dust, pollens, chemical fume, diseases germs are such impurities that present in air.
   3. Burning of refuse produces a huge amount of water vapour.
   4. Carbon monoxide in air produces allergic reactions like asthma.
   5. The sources of acid rain are difficult to control.
   6. The greenhouse effect disturbs the way earth's climate is maintained.
   7. Nearly two-quarter of the total surface of the earth is covered with water.
4. 4.

   Write about air pollution in brief. How can we prevent air pollution?
5. 5.

   Describe the sources of air pollution. Write effects of air pollution.
6. 6.

   What is acid rain? Why it is harmful to us?