Definition of BOD

Q.

Biological oxygen demand (BOD) is a standard criterion for

1. Measuring oxygen levels in blood

2. Computing oxygen levels in forest ecosystems

3. Pollution assay in aquatic ecosystems

4. Assessing oxygen levels in high altitude regions

Q. The BOD of three samples of water labelled A, B and C were recorded as 20 mg/L, 8mg/L and 400 mg/L, respectively. Which sample of water is the most polluted?

1. Sample A
2. Sample B
3. Sample C
4. Both sample A and sample B

Q. Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

1. Petroleum industry
2. Sugar industry
3. Domestic sewage
4. Dairy industry