Water Pollution — MCQ Practice
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 5 questions available.
A freshwater sample has DO 5.5 mg/L and BOD 2.5 mg/L. Using CPCB designated-use criteria, what follows from these two measurements?
After nutrient-rich runoff enters a lake, an algal bloom develops and later decays. Which pathway best explains a subsequent decline in dissolved oxygen?
A treated-water sample has low BOD. Which additional conclusion is justified without further tests?
What does CPCB Class A mean by a drinking-water source without conventional treatment but after disinfection?
A city doubles installed sewage-treatment capacity, but monitored river BOD changes little. Which information most directly tests a missing link in the claimed improvement?