MCQOPTIONS
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MCQOPTIONS
This section includes 140 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. |
Which of the following is formed from oxidation of organic matter in the presence of oxygen? |
| A. | NO₃ |
| B. | SO₄ |
| C. | H₂S |
| D. | NH₂ |
| Answer» B. SO₄ | |
| 2. |
______ zone lies between Euphotic and Benthic zone. |
| A. | Euphotic zone |
| B. | Benthic zone |
| C. | Littoral zone |
| D. | Climate zone |
| Answer» D. Climate zone | |
| 3. |
What is the value of BOD of industrial sewage in kg/day, given population equivalent as 6000 persons? |
| A. | 480 |
| B. | 160 |
| C. | 270 |
| D. | 100 |
| Answer» B. 160 | |
| 4. |
Which one of the following lakes has minimum productivity? |
| A. | Mesotrophic lake |
| B. | Senescent lake |
| C. | Oligotrophic lake |
| D. | Eutrophic lake |
| Answer» D. Eutrophic lake | |
| 5. |
________ is the process of acceleration of eutrophication due to increased phosphorous content in lakes. |
| A. | Photosynthesis |
| B. | Chemical eutrophication |
| C. | Cultural eutrophication |
| D. | Custom eutrophication |
| Answer» D. Custom eutrophication | |
| 6. |
_______ is the process of overgrowth of plants and algae in lakes. |
| A. | Transpiration |
| B. | Reproduction |
| C. | Eutrophication |
| D. | Photosynthesis |
| Answer» D. Photosynthesis | |
| 7. |
The expression of relative stability at 37°C is given by ___________ |
| A. | S = (1-(0.794)ᵀ³⁷) |
| B. | S = 100 (1-(0.794)ᵀ³⁷) |
| C. | S = 1-(0.794)ᵀ²⁰ |
| D. | S = 100 (1-(0.630)ᵀ³⁷) |
| Answer» E. | |
| 8. |
Which of the following process is used to remove the colloidal particles from the effluent? |
| A. | Chemical precipitation |
| B. | Chemical coagulation |
| C. | Ion exchange |
| D. | Adsorption |
| Answer» C. Ion exchange | |
| 9. |
In which unit operation, gases are released or absorbed in the effluent? |
| A. | Gas transfer |
| B. | Ion transfer |
| C. | Solute stabilization |
| D. | Solids Transfer |
| Answer» B. Ion transfer | |
| 10. |
Which of the following id the correct expression of population equivalent? |
| A. | BOD of industrial sewage in kg/day * 0.08 |
| B. | 0.08 * BOD of industrial sewage kg/day |
| C. | BOD of industrial sewage kg/day / 0.08kg/person/day |
| D. | BOD of industrial sewage kg/day + 0.08 |
| Answer» D. BOD of industrial sewage kg/day + 0.08 | |
| 11. |
Solids are removed from the wastewater by which of the following unit operation? |
| A. | Inter facial contact |
| B. | Solid stabilization |
| C. | Ion transfer |
| D. | Solids transfer |
| Answer» E. | |
| 12. |
The dimension formula of dynamic viscosity is ____________ |
| A. | ML⁻¹T |
| B. | ML⁻¹T⁻¹ |
| C. | ML⁻²T⁻² |
| D. | ML⁻¹T⁻³ |
| Answer» C. ML⁻²T⁻² | |
| 13. |
The head loss through the screen is given by HL = k* (Vₜ² – Vₐ²), where Vₜ and Vₐ are velocities through and above the screen respectively. What is the value of constant k? |
| A. | 1 |
| B. | 0.0050 |
| C. | 0.0729 |
| D. | 0.0236 |
| Answer» D. 0.0236 | |
| 14. |
The dilution factor is 400. What should be the type of treatment given to the water? |
| A. | Preliminary treatment |
| B. | Sedimentation, Flocculation |
| C. | Complete treatment |
| D. | No treatment |
| Answer» B. Sedimentation, Flocculation | |
| 15. |
Organic contaminants are removed from the wastewater by ____________ |
| A. | Water softening |
| B. | Demineralization |
| C. | Absorption |
| D. | Adsorption |
| Answer» E. | |
| 16. |
By which process, odor producing substances are oxidized? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» E. | |
| 17. |
The pollution zones in the river are divided into how many types? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 18. |
5 days BOD at 20°C is ___ of total demand. |
| A. | 20% |
| B. | 47% |
| C. | 68% |
| D. | 100% |
| Answer» D. 100% | |
| 19. |
In which zone, decomposition of the dead organism takes place? |
| A. | Climate zone |
| B. | Benthic zone |
| C. | Littoral zone |
| D. | Euphotic zone |
| Answer» C. Littoral zone | |
| 20. |
The minimum depth to which sewage should be discharged of sea water is ____________ |
| A. | 0.5m |
| B. | 1m |
| C. | 2m |
| D. | 3m |
| Answer» E. | |
| 21. |
In which of the following, large impurities are attached with air bubbles to remove it from the wastewater? |
| A. | Sludge digestion tank |
| B. | Primary sedimentation |
| C. | Vacuum floatation |
| D. | Oxidation pond |
| Answer» D. Oxidation pond | |
| 22. |
Calculate the percentage of relative stability, given 5 day incubation period at 37°C. |
| A. | 50% |
| B. | 60% |
| C. | 90% |
| D. | 99% |
| Answer» D. 99% | |
| 23. |
The turbulence decreases the DO content of water. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 24. |
Partially oxidized sewage contains __________ |
| A. | Nitrites and Nitrates |
| B. | Nitrates and sulfur |
| C. | Sulfates and nitrates |
| D. | Nitrites and sulfur |
| Answer» E. | |
| 25. |
Which of the following expression is correct regarding deoxygenation constant where symbols have their usual meaning? |
| A. | KDT = KD20 + (1.047)ᵀ⁻²⁰ |
| B. | KDT = KD20 / (1.047)ᵀ⁻²⁰ |
| C. | KDT = KD20 (1.047)ᵀ⁻²⁰ |
| D. | KDT = KD20 (1.04ᵀ) |
| Answer» D. KDT = KD20 (1.04ᵀ) | |
| 26. |
The maximum spacing between the bars in medium screen is ____________ |
| A. | 40mm |
| B. | 50mm |
| C. | 70mm |
| D. | 90mm |
| Answer» B. 50mm | |
| 27. |
In which pollution zone of the river, water retains its original dissolved oxygen concentration? |
| A. | Zone of degradation |
| B. | Zone of recovery |
| C. | Zone of active decomposition |
| D. | Zone of clean water |
| Answer» E. | |
| 28. |
The unit of dynamic viscosity is ____________ |
| A. | Metre²/Sec |
| B. | Metre/Sec |
| C. | Pa * Sec |
| D. | Dimensionless |
| Answer» D. Dimensionless | |
| 29. |
Which of the following is a prime lake pollutant? |
| A. | Iodine |
| B. | Phosphorous |
| C. | Potassium |
| D. | Sodium |
| Answer» C. Potassium | |
| 30. |
The tolerance limit of pH value of sewage to be discharged into sea water is ____________ |
| A. | 1-5ppm |
| B. | 2-9ppm |
| C. | 5.5-9ppm |
| D. | 6-10ppm |
| Answer» D. 6-10ppm | |
| 31. |
Which type of pollution is Cultural eutrophication? |
| A. | Water pollution |
| B. | Noise pollution |
| C. | Thermal pollution |
| D. | Soil pollution |
| Answer» B. Noise pollution | |
| 32. |
The tolerance limit of oil and grease of sewage to be disposed on land is ____________ |
| A. | 40ppm |
| B. | 30ppm |
| C. | 20ppm |
| D. | 10ppm |
| Answer» C. 20ppm | |
| 33. |
The coefficient of drag for a transition settling is ____________ |
| A. | CD = 18.5/R⁰·⁶ |
| B. | CD = 24/R |
| C. | CD = 8.5/R⁰·⁶ |
| D. | CD = R/24 |
| Answer» B. CD = 24/R | |
| 34. |
Screens are inclined to the direction of flow to ____________ |
| A. | Increase the flow velocity |
| B. | Increase the opening area |
| C. | Decrease the flow velocity |
| D. | Increase the head loss |
| Answer» D. Increase the head loss | |
| 35. |
How many types of aerators are commonly used in the treatment of wastewater? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 36. |
In which pollution zone of the river, the dissolved oxygen reduced to 0? |
| A. | Zone of degradation |
| B. | Zone of recovery |
| C. | Zone of clean water |
| D. | Zone of active decomposition |
| Answer» E. | |
| 37. |
The dilution factor is expressed by _____________ |
| A. | Volume of diluted sample + Volume of sewage |
| B. | Volume of diluted sample / Volume of sewage |
| C. | Volume of diluted sample – Volume of sewage |
| D. | Volume of diluted sample* Volume of sewage |
| Answer» C. Volume of diluted sample – Volume of sewage | |
| 38. |
The aerobic decomposition of sulfurous organic matter gives __________ |
| A. | Nitrites and water |
| B. | Carbon dioxide and water |
| C. | Sulfates and water |
| D. | Nitrogen and Ammonia |
| Answer» D. Nitrogen and Ammonia | |
| 39. |
Which chemical is used for the titration of waste water for finding its chloride content? |
| A. | Potassium chloride |
| B. | Sodium chloride |
| C. | Potassium chromate |
| D. | Potassium dichromate |
| Answer» D. Potassium dichromate | |
| 40. |
The type of solids which floats in sewage is __________ |
| A. | Suspended solids |
| B. | Settleable solids |
| C. | Dissolved solids |
| D. | Total solids |
| Answer» B. Settleable solids | |
| 41. |
The presence of which of the following in sewage indicates nitrogen content before decomposition of sewage? |
| A. | Nitrites |
| B. | Nitrates |
| C. | Free ammonia |
| D. | Albuminoid nitrogen |
| Answer» E. | |
| 42. |
The presence of free ammonia in sewage represents ____________ |
| A. | Air pollution |
| B. | Old pollution |
| C. | Recent pollution |
| D. | Water pollution |
| Answer» D. Water pollution | |
| 43. |
The presence of which of the following indicates old pollution? |
| A. | Nitrates |
| B. | Nitrites |
| C. | H₂S |
| D. | Sulfates |
| Answer» E. | |
| 44. |
The odor quality of compound is ammoniacal. Identify the type of compound from the following options. |
| A. | Acetic acid |
| B. | Benzene |
| C. | Ammonia |
| D. | Methane |
| Answer» D. Methane | |
| 45. |
The wastewater from the kitchen is an example of __________ |
| A. | Black water |
| B. | Yellow water |
| C. | Green water |
| D. | Grey water |
| Answer» E. | |
| 46. |
The type of wastewater from the flushing operation of toilet is __________ |
| A. | Green water |
| B. | Red water |
| C. | Black water |
| D. | Brown water |
| Answer» D. Brown water | |
| 47. |
The temperature of sewage increases. What will be the effect on the dissolved oxygen in sewage? |
| A. | Remains constant |
| B. | Increase |
| C. | Decrease |
| D. | No effect |
| Answer» D. No effect | |
| 48. |
What is the minimum quantity of dissolved oxygen that should be present in the treated sewage? |
| A. | 6ppm |
| B. | 4ppm |
| C. | 1ppm |
| D. | 10ppm |
| Answer» C. 1ppm | |
| 49. |
_______ indicates the freshness of sewage. |
| A. | Turbidity |
| B. | Color |
| C. | Temperature |
| D. | COD |
| Answer» C. Temperature | |
| 50. |
Identify the incorrect statement from the following? |
| A. | High odor intensity indicates odorless water |
| B. | Fresh sewage is odorless |
| C. | Turbidity can be measured by turbidity rod |
| D. | NTU is a unit of turbidity |
| Answer» B. Fresh sewage is odorless | |