Question

Clean water would have Biochemical oxygen demand (BOD) value of less than:

• A. 17 ppm
• B. 5 ppm
• C. 200,000 ppm
• D. 10 ppm

Answer 1

The correct option is B 5 ppm

A water supply with a BOD level of 3-5 ppm is considered moderately clean. In water with a BOD level of 6-9 ppm, the water is considered somewhat polluted because there is usually organic matter present and bacteria are decomposing this waste.

Hence, clean water would have a BOD value of less than 5.

Hence, the correct option is $\text{B}$