MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
5 days BOD at 20oC is ___ of total demand. |
| A. | 20% |
| B. | 47% |
| C. | 68% |
| D. | 100% |
| Answer» D. 100% | |
| 2. |
The oxidizing agent used in COD test is ___________ |
| A. | Potassium chloride |
| B. | Potassium per-manganate |
| C. | Potassium chromate |
| D. | Potassium dichromate |
| Answer» E. | |
| 3. |
COD is abbreviated as ___________ |
| A. | Chemical oxygen demand |
| B. | Complex oxygen demand |
| C. | Customary oxygen demand |
| D. | Chemical oxygen deficit |
| Answer» B. Complex oxygen demand | |
| 4. |
Calculate the percentage of relative stability, given 5 day incubation period at 370C. |
| A. | 50% |
| B. | 60% |
| C. | 90% |
| D. | 99% |
| Answer» D. 99% | |
| 5. |
The expression of relative stability at 37oC is given by ___________ |
| A. | S = (1-(0.794)<sup>T37</sup>) |
| B. | S = 100 (1-(0.794)<sup>T37</sup>) |
| C. | S = 1-(0.794)<sup>T20</sup> |
| D. | S = 100 (1-(0.630)<sup>T37</sup>) |
| Answer» E. | |
| 6. |
The expression of relative stability at 20oC is given by ___________ |
| A. | S = (1-(0.794)<sup>T20</sup>) |
| B. | S = 100 (1-(0.794)<sup>T20</sup>) |
| C. | S = 1-(0.794)<sup>T20</sup> |
| D. | S = 100 (0.794)<sup>T20</sup> |
| Answer» C. S = 1-(0.794)<sup>T20</sup> | |
| 7. |
The average standard BOD of domestic sewage is measured in ____________ |
| A. | ppm |
| B. | Kg/day |
| C. | Kg per person per day |
| D. | Number of persons per day |
| Answer» D. Number of persons per day | |