MCQOPTIONS
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MCQOPTIONS
This section includes 24 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. |
What is the mathematical expression of BOD? |
| A. | BOD = [(D1-D2)-(B1-B2)f]/P |
| B. | BOD = [(D1-D2)-(B1-B2)f]. |
| C. | BOD = [(D1-D2) f]/P |
| D. | BOD = [(D1-D2)-(B1-B2)]/P |
| Answer» B. BOD = [(D1-D2)-(B1-B2)f]. | |
| 2. |
At what temperature the bottles for the BOD test are incubated? |
| A. | 25 degree Celsius |
| B. | 35 degree Celsius |
| C. | 20 degree Celsius |
| D. | 30 degree Celsius |
| Answer» D. 30 degree Celsius | |
| 3. |
The BOD test is carried out for how many days? |
| A. | 1 day |
| B. | 2 days |
| C. | 5 days |
| D. | 6 days |
| Answer» D. 6 days | |
| 4. |
What is the TSS effluent concentration for 7 days? |
| A. | 30 mg/L |
| B. | 45 mg/L |
| C. | 25 mg/L |
| D. | 40 mg/L |
| Answer» C. 25 mg/L | |
| 5. |
_________ is determined by measuring the dissolved oxygen used by microorganisms during the biochemical oxidation of organic matter in 5 days at 20˚C. |
| A. | BOD5 |
| B. | COD |
| C. | TOC |
| D. | ThOD |
| Answer» B. COD | |
| 6. |
WHAT_IS_THE_TSS_EFFLUENT_CONCENTRATION_FOR_7_DAYS??$ |
| A. | 30 mg/L |
| B. | 45 mg/L |
| C. | 25 mg/L |
| D. | 40 mg/L |
| Answer» C. 25 mg/L | |
| 7. |
At what temperature the bottles for the BOD test are incubated?$ |
| A. | 25 degree Celsius |
| B. | 35 degree Celsius |
| C. | 20 degree Celsius |
| D. | 30 degree Celsius |
| Answer» D. 30 degree Celsius | |
| 8. |
The_BOD_test_is_carried_out_for_how_many_days?$ |
| A. | 1 day |
| B. | 2 days |
| C. | 5 days |
| D. | 6 days |
| Answer» D. 6 days | |
| 9. |
Which of these is not a method to determine the number of colonies of bacteria present in a sample? |
| A. | Multiple Tube fermentation |
| B. | Pour and spread plate method |
| C. | Membrane filter technique |
| D. | Toxicity test |
| Answer» E. | |
| 10. |
Which of these is the used as the indicator when the titration is carried out to determine the amount of COD present in a sample. |
| A. | Methyl Orange |
| B. | Methyl blue |
| C. | Ferroin |
| D. | Phenolphthalein |
| Answer» D. Phenolphthalein | |
| 11. |
How is TSS calculated? |
| A. | MPN |
| B. | HPLC |
| C. | Filtration |
| D. | Mass spectrometer |
| Answer» D. Mass spectrometer | |
| 12. |
What is the ratio of BOD/COD in the final effluent? |
| A. | 0 8-1.2 |
| B. | 0.2-0.5 |
| C. | 0.1-0.3 |
| D. | 0.4-0.6 |
| Answer» D. 0.4-0.6 | |
| 13. |
What is the ratio of BOD/COD in untreated waste? |
| A. | 1-3 |
| B. | 0.3-0.8 |
| C. | 0.1-0.2 |
| D. | 3-5 |
| Answer» C. 0.1-0.2 | |
| 14. |
How is COD calculated? |
| A. | Waste water is oxidised chemically using sodium in acid solutions |
| B. | Waste water is oxidised chemically using dichromate in acid solutions |
| C. | Waste water is oxidised chemically using bromine in acid solutions |
| D. | Waste water is oxidised chemically using strontium in acid solutions |
| Answer» C. Waste water is oxidised chemically using bromine in acid solutions | |
| 15. |
In terms of percentage how much BOD is oxidised in 5 days? |
| A. | 90% |
| B. | 70-90% |
| C. | 60-70% |
| D. | 50% |
| Answer» D. 50% | |
| 16. |
What_is_the_mathematical_expression_of_BOD? |
| A. | BOD = [(D1-D2)-(B1-B2)f]/P |
| B. | BOD = [(D1-D2)-(B1-B2)f]. |
| C. | BOD = [(D1-D2) f]/P |
| D. | BOD = [(D1-D2)-(B1-B2)]/P |
| Answer» B. BOD = [(D1-D2)-(B1-B2)f]. | |
| 17. |
What is the maximum concentration of total solids present in wastewater? |
| A. | 350 mg/L |
| B. | 720 mg/L |
| C. | 1200 mg/ L |
| D. | 850 mg/L |
| Answer» D. 850 mg/L | |
| 18. |
Which of the following indicates that the water body has been used for waste disposal? |
| A. | Chlorides |
| B. | Nitrates |
| C. | Phosphates |
| D. | Ammonia |
| Answer» B. Nitrates | |
| 19. |
Which of the following is used for a small concentration of organic matter? |
| A. | COD |
| B. | TOC |
| C. | BOD |
| D. | ThOD |
| Answer» C. BOD | |
| 20. |
______ is determined by measuring the dissolved oxygen used during the chemical oxidation of organic matter in 3 hours. |
| A. | COD |
| B. | BOD |
| C. | ThOD |
| D. | TOC |
| Answer» B. BOD | |
| 21. |
After how many days will nitrogen will be oxidized to nitrite and nitrate? |
| A. | 9 |
| B. | 10 |
| C. | 10-12 |
| D. | 14-15 |
| Answer» D. 14-15 | |
| 22. |
How are many forms of nitrogen present in wastewater? |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 5 |
| Answer» C. 2 | |
| 23. |
_________ is determined by measuring the dissolved oxygen used by microorganisms during the biochemical oxidation of organic matter in 5 days at 20ÀöC.$ |
| A. | BOD5 |
| B. | COD |
| C. | TOC |
| D. | ThOD |
| Answer» B. COD | |
| 24. |
_______ are found in agricultural wastes. |
| A. | Pesticides |
| B. | Phenols |
| C. | Proteins |
| D. | Grease |
| Answer» B. Phenols | |