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प्रश्न
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
विकल्प
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
Bhopal Gas Tragedy is a case of ________.
Photo chemical smog formed in congested metropolitan cities mainly consists of ______.
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 |
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Reason(R): High biological oxygen demand means high activity of bacteria in water.
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Explain the effects of acid rain.
