Environmental Issues
- The most common indicator organism that represents polluted water is
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E. coli lives in the human intestine. If they are present in water it indicates that the water is polluted. E.coli coliform count test is done.
Correct Option: A
E. coli lives in the human intestine. If they are present in water it indicates that the water is polluted. E.coli coliform count test is done.
- In 1984, Bhopal gas tragedy took place because methyl isocyanate
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In Bhopal gas tragedy methyl isocyanate (MIC) reacted with water to produce a large amount of heat, as it was an exothermic reaction. Due to this increase in pressure the safety valve of the tank bursted and the gas came out.
Correct Option: D
In Bhopal gas tragedy methyl isocyanate (MIC) reacted with water to produce a large amount of heat, as it was an exothermic reaction. Due to this increase in pressure the safety valve of the tank bursted and the gas came out.
- More than 70% of world’s freshwater is contained in:
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Three fourth surface of earth is covered by oceans which contain 97.5% of total water. It is marine water with about 3.5% salt content only 2.5% is fresh water which occurs on land. Most of this water (1.97%) occurs as frozen ice caps and glaciers, 0.5% fresh water occurs as ground water. Rivers and lakes contain 0.02%, soil 0.01% while atmosphere possesses 0.001% of water as vapours.
Correct Option: A
Three fourth surface of earth is covered by oceans which contain 97.5% of total water. It is marine water with about 3.5% salt content only 2.5% is fresh water which occurs on land. Most of this water (1.97%) occurs as frozen ice caps and glaciers, 0.5% fresh water occurs as ground water. Rivers and lakes contain 0.02%, soil 0.01% while atmosphere possesses 0.001% of water as vapours.
- Which of the following is not used for disinfection of drinking water?
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Chlorine, ozone, chloramine are used for disinfection of drinking water.
Correct Option: D
Chlorine, ozone, chloramine are used for disinfection of drinking water.
- Prolonged liberal irrigation of agricultural fields is likely to create the problem of
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Since all surface and ground water contains salts to varying degrees. Therefore excessive irrigation followed by evaporation of the unabsorbed water leads to salinity. This also leads to waterlogging.
Correct Option: C
Since all surface and ground water contains salts to varying degrees. Therefore excessive irrigation followed by evaporation of the unabsorbed water leads to salinity. This also leads to waterlogging.
