Advertisements
Advertisements
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
Advertisements
उत्तर
(A) is correct but (R) is not correct
APPEARS IN
संबंधित प्रश्न
Bhopal Gas Tragedy is a case of ________.
Which sequence for green house gases is based on GWP?
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
Match the List I with List II and select the correct answer using the code given below the lists.
| List I | List II | ||
| A | Depletion of ozone layer |
1 | CO2 |
| B | Acid rain | 2 | NO |
| C | Photochemical smog | 3 | SO2 |
| D | Green house effect | 4 | CFC |
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.
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?
Differentiate the following:
Viable and non-viable particulate pollutants
