engineering recuitment DDA JE Civil 2023 Mock Test Environmental Engineering Quality and Characteristics of Sewage
Which one of the following pairs is not correctly matched?
1
BOD/COD = 0: Waste water is toxic
2
BOD/COD ≤ 0.2: Acclimatization of seed is necessary
3
BOD/COD ≥ 0.6: Waste water is non-biodegradable
4
BOD = COD = 0: Waste water is devoid of organic matter