

InterviewSolution
Saved Bookmarks
1. |
When huge amount of sewage is dumped into a river, its BOD willA. increaseB. decreaseC. sharply decreaseD. remain unchanged |
Answer» Correct Answer - A Degree of impurity of water due to organic matter is measured in terms of BOD (`O_(2)` in milligram required for five days in one litre of `H_(2)O` at `20^(@)C` for micro-organisms to metabolise organic wastes). In polluted water reoxygenation decreases than deoxygenation. So, in this water BOD (Biological Oxygen Demand) increases. |
|