Presence of soluble organics in polluted water causes_________________?

Related Mcqs:

1. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?

   A. Decreases
   B. Increases
   C. Remain constant
   D. May increase or decrease; depends on the chemical characteristics of polluted water

2. Presence of bacteria in potable (drinking) water causes_________________?

   A. Turbidity
   B. Disease
   C. Bad odour
   D. Bad taste & colour

3. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

   A. Coagulation and flocculation of colloids
   B. Oxidation of carbonaceous matter to CO2
   C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
   to the nitrite and eventually to the nitrate
   D. All A., B. and C.

4. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

   A. Poor visibility due to sky darkening
   B. Irritation in eyes
   C. Respiratory trouble
   D. All A., B. and C.

5. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?

   A. Skin disorder
   B. Bronchitis
   C. Bone disease
   D. Cancer

6. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?

   A. Paralysis of muscles & loss of appetite
   B. Nervous depression
   C. Gastritis and diarrhea
   D. All A., B. and C.

7. Carbon monoxide is a pollutant, which causes_________________?

   A. Respiratory disease (e.g. asthma)
   B. Asphyxiation (suffocation) leading to death
   C. Retardation in crop growth
   D. Damage to building materials like marble

8. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?

   A. Sedimentation
   B. Skimming off
   C. Chlorination
   D. Biological oxidation

9. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?

   A. Natural aeration of water stream
   B. Photosynthetic action of algae
   C. Both A. & B.
   D. Neither A. nor B.

10. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

    A. Radioactive
    B. Organic
    C. Inorganic
    D. None of these