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प्रश्न
Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted.
Reason(R): High biological oxygen demand means high activity of bacteria in water.
पर्याय
Both (A) and R are correct and (R) is the correct explanation of (A)
Both (A) and R are correct and (R) is not the correct explanation of (A)
Both (A) and (R) are not correct
(A) is correct but (R) is not correct
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उत्तर
(A) is correct but (R) is not correct
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संबंधित प्रश्न
Photo chemical smog formed in congested metropolitan cities mainly consists of ______.
Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using ______.
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
What would happen, if the greenhouse gases were totally missing in the earth’s atmosphere?
From where does ozone come in the photo chemical smog?
A person was using water supplied by corporation. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?
Explain how does greenhouse effect cause global warming.
How does classical smog differ from photochemical smog?
Ethane bums completely in air to give CO2. while in a limited supply of air gives CO. The same gases are found in automobile exhaust. Both CO and CO2 are atmospheric pollutants
- What is the danger associated with these gases?
- How do the pollutants affect the human body?
How is acid rain formed?
