MCQOPTIONS
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MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the residence time for the following data.Influent nitrate: 22 mg/LEffluent nitrate: 3 mg/LOverall denitrification rate: 0.038 per day.MLVSS: 2000 mg/L |
| A. | 1.5 hrs |
| B. | 5 hrs |
| C. | 6 hrs |
| D. | 9 hrs |
| Answer» D. 9 hrs | |
| 2. |
What is the denitrification rate for the following data?Temperature: 10 degree CelsiusDissolved oxygen: 10mg/L |
| A. | 0.038 per day |
| B. | 0.0038 per day |
| C. | 0.38 per day |
| D. | 3.8 per day |
| Answer» B. 0.0038 per day | |
| 3. |
What is the minimum temperature required for denitrification process? |
| A. | 3˚C |
| B. | 5˚C |
| C. | 15˚C |
| D. | 30˚C |
| Answer» C. 15˚C | |
| 4. |
What is the optimum pH for nitrosomonas? |
| A. | 6.5-7.5 |
| B. | 7.5-8.5 |
| C. | 9.5-10.5 |
| D. | 13.5-14 |
| Answer» C. 9.5-10.5 | |
| 5. |
What is the minimum amount of dissolved oxygen required for nitrification? |
| A. | 0.5 mg/L |
| B. | 1.0 mg/L |
| C. | 1.5 mg/L |
| D. | 2.0 mg/L |
| Answer» C. 1.5 mg/L | |
| 6. |
What is the process for converting organic-nitrogen to ammonia? |
| A. | Hydrolysis |
| B. | Nitrification |
| C. | Denitrification |
| D. | Oxidation |
| Answer» B. Nitrification | |
| 7. |
WHAT_IS_THE_PROCESS_FOR_CONVERTING_ORGANIC-NITROGEN_TO_AMMONIA??$ |
| A. | Hydrolysis |
| B. | Nitrification |
| C. | Denitrification |
| D. | Oxidation |
| Answer» B. Nitrification | |
| 8. |
What is the optimum pH for nitrosomonas?$ |
| A. | 6.5-7.5 |
| B. | 7.5-8.5 |
| C. | 9.5-10.5 |
| D. | 13.5-14 |
| Answer» C. 9.5-10.5 | |
| 9. |
What_is_the_minimum_amount_of_dissolved_oxygen_required_for_nitrification?$ |
| A. | 0.5 mg/L |
| B. | 1.0 mg/L |
| C. | 1.5 mg/L |
| D. | 2.0 mg/L |
| Answer» C. 1.5 mg/L | |
| 10. |
What is the temperature at which the denitrification process takes place when it is carried out in a fluidised bed reactor? |
| A. | 30-35 degree |
| B. | 35 degree |
| C. | 40 degree |
| D. | 25 degree |
| Answer» B. 35 degree | |
| 11. |
Ammonia is converted into nitrogen by which type of bacteria in anaerobic conditions? |
| A. | Autotrophic |
| B. | Heterotrophic |
| C. | Organotrophs |
| D. | Lithotrophs |
| Answer» B. Heterotrophic | |
| 12. |
Which of these chemicals is added in the post anoxic step? |
| A. | Acetate |
| B. | Propanol |
| C. | Butanol |
| D. | Chloroform |
| Answer» B. Propanol | |
| 13. |
What is the denitrification rate for the following data? |
| A. | |
| B. | |
| Answer» B. | |
| 14. |
What_is_the_minimum_temperature_required_for_denitrification_process? |
| A. | 3ÀöC |
| B. | 5ÀöC |
| C. | 15ÀöC |
| D. | 30ÀöC |
| Answer» C. 15‚àö√Ñ‚àö‚àÇC | |
| 15. |
Which of the below is used to denitrify nitrates? |
| A. | Carbon |
| B. | Aluminium |
| C. | Iron |
| D. | Copper |
| Answer» B. Aluminium | |
| 16. |
How many molecules of oxygen are required for one molecule of nitrogen? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 17. |
Denitrification releases _______ |
| A. | Nitrogen |
| B. | Oxygen and nitrogen |
| C. | Carbon-dioxide |
| D. | Nitrogen and carbon-monoxide |
| Answer» B. Oxygen and nitrogen | |
| 18. |
Microbial yield under aerobic conditions is lower than anoxic conditions. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
In dissimilatory denitrification, ______ serves as the electron acceptor in energy metabolism. |
| A. | Nitrate |
| B. | Nitrite |
| C. | Nitrogen |
| D. | Ammonia |
| Answer» B. Nitrite | |
| 20. |
Nitrate conversion takes place only through assimilatory cellular functions. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
In nitrification, ammonia is converted to _____ |
| A. | Nitrogen |
| B. | Nitrate |
| C. | Nitrite |
| D. | Amide |
| Answer» C. Nitrite | |
| 22. |
Nitrification is performed by a small group of _______ |
| A. | Autotrophic bacteria |
| B. | Eutrophic bacteria |
| C. | Fungi |
| D. | Viruses |
| Answer» B. Eutrophic bacteria | |