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प्रश्न
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
पर्याय
highly polluted
poor in dissolved oxygen
rich in dissolved oxygen
low COD
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उत्तर
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be rich in dissolved oxygen.
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संबंधित प्रश्न
Living in the atmosphere of CO is dangerous because it ______.
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 |
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.
Define smog.
From where does ozone come in the photo chemical smog?
What are particulate pollutants? Explain any three.
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?
Differentiate the following:
BOD and COD
Differentiate the following:
Viable and non-viable particulate pollutants
Explain how oxygen deficiency is caused by carbon monoxide in our blood? Give its effect.
