POLLUTION OF AIR AND WATER

Which of the following Chemicals cause pollution by damaging the Ozone layer ?

• Nitrogen oxides

• Hydrochlorofluorocarbons

• Carbon dioxide

• Chlorofluorocarbons

Air is a (a)   of many gases that are present in a fixed ratio.

What method is suggested for removing suspended impurities from water?

 

(a)  

How can industrial effluent be treated to remove toxic substances?

• Boiling

• Adding chlorine tablets

• Chemical treatment

• Filtration through muslin cloth

  
  

What is the term used for making filtered water germ-free by boiling?

(a)  

Which chemical is mentioned for treating water to make it germ-free?

• Bleaching powder

• Potassium permanganate

• Chlorine tablets

• Sodium bicarbonate

Which action is recommended to prevent water pollution at an individual level?

• Disposing garbage in rivers

• Overusing pesticides and fertilizers

  
  

• Saving and not wasting water

• Ignoring laws for industrial units

  
  

What is one major cause of the increasing concentration of carbon dioxide in the atmosphere?

(a)  

What effect does the increased concentration of carbon dioxide have on atmospheric temperature?

• Decreases atmospheric temperature

     

• Causes acid rain

     

• Traps solar radiation and increases atmospheric temperature

     

•   Leads to ozone depletion

How does carbon monoxide affect the human body in a polluted environment?

• Increases oxygen carrying capacity

• Decreases blood pressure

• Combines with hemoglobin and decreases oxygen carrying capacity

• Stimulates the immune system