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Question
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
Options
highly polluted
poor in dissolved oxygen
rich in dissolved oxygen
low COD
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Solution
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be rich in dissolved oxygen.
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RELATED QUESTIONS
Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using ______.
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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