Water Pollution — Prelims Questions

Which of the following statements regarding Biochemical Oxygen Demand (BOD) is INCORRECT?

Which of the following heavy metals is associated with Minamata disease?

Eutrophication in a lake is primarily caused by an increase in the concentration of:

A water sample has an initial Dissolved Oxygen (DO) of $8.0,\text{mg/L}$. After 5 days of incubation at $20^circ C$, the DO drops to $2.5,\text{mg/L}$. What is the BOD of the sample, and what does it indicate about the water quality?

Which of the following is NOT a characteristic of non-point source water pollution?

Which of the following is a consequence of thermal pollution in aquatic ecosystems?