| Q.69 | Chemical oxygen demand in domestic waste water should NOT be more than: | |
| Ans | 1. 300 mg/lit | |
| 2. 200 mg/lit | ||
| 3. 250 mg/lit | ||
| 4. 150 mg/lit |
Correct Ans Provided: 3
Date: 17/07/2022 Shift: 2:30 PM – 5:30 PM Q. No: 69
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