MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In India, the average temperature of sewage is __________ |
| A. | 10°C |
| B. | 20°C |
| C. | 40°C |
| D. | 80°C |
| Answer» C. 40°C | |
| 2. |
The odor in wastewater is measured by __________ |
| A. | Osmoscope |
| B. | Chromatography |
| C. | Olfactometer |
| D. | Turbidity meter |
| Answer» B. Chromatography | |
| 3. |
______ represents the number of dilutions required to reduce odor. |
| A. | Dispersion |
| B. | Threshold odor number |
| C. | BOD |
| D. | COD |
| Answer» C. BOD | |
| 4. |
The odor quality of Amines is __________ |
| A. | Rotten egg |
| B. | Fishy |
| C. | Fecal matter |
| D. | Decayed cabbage |
| Answer» C. Fecal matter | |
| 5. |
Which of the following instrument is used to measure turbidity? |
| A. | Olfactometer |
| B. | Turbidity meter |
| C. | Colorimeter |
| D. | Spectrophotometer |
| Answer» C. Colorimeter | |
| 6. |
The color of the septic sewage is __________ |
| A. | Pink |
| B. | Red |
| C. | Black |
| D. | Grey |
| Answer» D. Grey | |
| 7. |
The permissible dose of chloride in domestic sewage is __________ |
| A. | 120ppm |
| B. | 10ppm |
| C. | 1ppm |
| D. | 250ppm |
| Answer» B. 10ppm | |
| 8. |
When the sewage becomes stronger, the turbidity of wastewater? |
| A. | Increases |
| B. | Decreases |
| C. | Becomes constant |
| D. | Slightly decrease |
| Answer» B. Decreases | |
| 9. |
Which color indicates the fresh sewage? |
| A. | Pink |
| B. | Red |
| C. | Black |
| D. | Grey |
| Answer» E. | |
| 10. |
Imhoff cone is used to measure the _______ |
| A. | Suspended solids |
| B. | Settleable solids |
| C. | Dissolved solids |
| D. | Total solids |
| Answer» C. Dissolved solids | |
| 11. |
The decomposition of sewage takes place, causing a pungent smell. Which of the following causes the pungent smell? |
| A. | CO₂ |
| B. | H₂SO₄ |
| C. | HCL |
| D. | H₂S |
| Answer» E. | |
| 12. |
________ is used to find the D.O content of sewage. |
| A. | Winkler method |
| B. | Chromatography |
| C. | Kjeldahl method |
| D. | Olfactometer |
| Answer» C. Kjeldahl method | |
| 13. |
Which of the following disease is caused due to lack of nitrates? |
| A. | Diphtheria |
| B. | Methemoglobinemia |
| C. | Tuberculosis |
| D. | Meningitis |
| Answer» C. Tuberculosis | |
| 14. |
Which of the following is an end product formed from both the aerobic and anaerobic decomposition of organic matter? |
| A. | NO₃ |
| B. | CH₄ |
| C. | H₂S |
| D. | CO₂ |
| Answer» E. | |
| 15. |
The aerobic decomposition of carbonaceous organic matter gives __________ |
| A. | Nitrites and water |
| B. | Carbon dioxide and water |
| C. | Sulfates and water |
| D. | Nitrogen and Ammonia |
| Answer» C. Sulfates and water | |
| 16. |
Identify the odd one of the following. |
| A. | Fatty acids |
| B. | Chlorides |
| C. | Cellulose |
| D. | Fats |
| Answer» C. Cellulose | |
| 17. |
The fresh sewage is acidic in nature. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 18. |
The maximum quantity of dissolved oxygen present in wastewater is called __________ |
| A. | Saturated dissolved oxygen |
| B. | Maximum dissolved oxygen |
| C. | Optimal dissolved oxygen |
| D. | Peak dissolved oxygen |
| Answer» B. Maximum dissolved oxygen | |
| 19. |
The oxygen deficit is maximum when? |
| A. | Rate of reaeration is 0 |
| B. | Rate of deoxygenation is 0 |
| C. | Rate of reaeration equals the rate of deoxygenation |
| D. | Rate of reaeration > rate of deoxygenation |
| Answer» D. Rate of reaeration > rate of deoxygenation | |
| 20. |
Rate of aeration is independent of the D.O content of wastewater. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't Say |
| Answer» C. May be True or False | |
| 21. |
What is yellow curve represents in the following figure? |
| A. | Deoxygenation curve |
| B. | Reoxygenation curve |
| C. | Oxygen sag curve |
| D. | Equilibrium concentration of oxygen |
| Answer» B. Reoxygenation curve | |
| 22. |
The maximum deficiency of dissolved oxygen is represented by ____________ |
| A. | Dotted blue line |
| B. | Green curve |
| C. | Yellow curve |
| D. | Violet curve |
| Answer» B. Green curve | |
| 23. |
Which of the following is represented by the green curve in the following figure? |
| A. | Deoxygenation curve |
| B. | Reoxygenation curve |
| C. | Oxygen sag curve |
| D. | Equilibrium concentration of oxygen |
| Answer» C. Oxygen sag curve | |
| 24. |
Which of the following is formed from the anaerobic oxidation of organic matter? |
| A. | NO₃ |
| B. | SO₄ |
| C. | H₂S |
| D. | NH₂ |
| Answer» D. NH₂ | |
| 25. |
The lakes are classified into how many types on the basis of productivity? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 26. |
The uppermost zone in lakes is called as ____________ |
| A. | Euphotic zone |
| B. | Benthic zone |
| C. | Littoral zone |
| D. | Climate zone |
| Answer» B. Benthic zone | |
| 27. |
_____ is the amount of oxygen required to oxidize only organic matter in sewage. |
| A. | Turbidity |
| B. | BOD |
| C. | COD |
| D. | DO |
| Answer» C. COD | |
| 28. |
In which pollution zone of the river, growth of algae reappear? |
| A. | Zone of degradation |
| B. | Zone of recovery |
| C. | Zone of active decomposition |
| D. | Zone of clean water |
| Answer» C. Zone of active decomposition | |
| 29. |
In which form of solute stabilization, hydrogen sulfide in the effluent is oxidized into sulfate? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» B. Liming | |
| 30. |
The fishes were present in the river, but algaes were not able to survive. What is the zone of pollution of the river? |
| A. | Zone of recovery |
| B. | Zone of degradation |
| C. | Zone of clean water |
| D. | Zone of active decomposition |
| Answer» C. Zone of clean water | |
| 31. |
The detention period of detritus tank is ____________ |
| A. | 40 seconds |
| B. | 1 minute |
| C. | 3 minute |
| D. | 1 hour |
| Answer» D. 1 hour | |
| 32. |
Which of the following is measured in mg/L? |
| A. | Unit weight |
| B. | Coefficient of cohesion |
| C. | Discharge |
| D. | Turbidity |
| Answer» E. | |
| 33. |
__________ is used to cut the sewage into smaller parts. |
| A. | Flocculator |
| B. | Tube settlers |
| C. | Shredders |
| D. | Aerators |
| Answer» D. Aerators | |
| 34. |
The tolerance limit of COD of sewage to be discharged in sea water is ____________ |
| A. | 250ppm |
| B. | 100ppm |
| C. | 40ppm |
| D. | 20ppm |
| Answer» B. 100ppm | |
| 35. |
The depth of Euphotic zone is measured by ____________ |
| A. | Calorimeter |
| B. | Turbidity meter |
| C. | Secchi disk |
| D. | Radar |
| Answer» D. Radar | |
| 36. |
Which form of solute stabilization occurs when effluent passes through limestone? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» C. Re-carbonation | |
| 37. |
Which of the following has minimum detention period? |
| A. | Grit chamber |
| B. | Sedimentation tank |
| C. | Oxidation ditch |
| D. | Oxidation pond |
| Answer» B. Sedimentation tank | |
| 38. |
Which of the following device is used for the removal of oil and grease? |
| A. | Skimming tank |
| B. | Grit chambers |
| C. | Tube settlers |
| D. | Flocculator |
| Answer» B. Grit chambers | |
| 39. |
Which is the third zone of pollution in the river? |
| A. | Zone of recovery |
| B. | Zone of degradation |
| C. | Zone of clean water |
| D. | Zone of active decomposition |
| Answer» B. Zone of degradation | |
| 40. |
When the BOD of wastewater increases, then? |
| A. | Rate of reaeration decreases |
| B. | Rate of oxygen deficit increases |
| C. | Rate of oxygen deficit decreases |
| D. | Amount of oxygen in wastewater increases |
| Answer» C. Rate of oxygen deficit decreases | |
| 41. |
The nitrogenous demand begins after how many days? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 5 |
| Answer» E. | |
| 42. |
Which of the following is formed due to the anaerobic decomposition of carbonaceous organic matter? |
| A. | Nitrites |
| B. | Carbon dioxide |
| C. | Water |
| D. | Nitrogen |
| Answer» C. Water | |
| 43. |
BOD of wastewater having aerobic oxidation is more than that, having anaerobic oxidation. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 44. |
Methane is formed due to the reduction of __________ |
| A. | Nitrates |
| B. | Sulfates |
| C. | Carbon dioxide |
| D. | Organic acids |
| Answer» E. | |
| 45. |
Which of the following is formed due to the reduction of sulfurous organic matter? |
| A. | Hydrogen sulfide |
| B. | Hydrochloric acid |
| C. | Sulfuric acid |
| D. | Sulfur dioxide |
| Answer» B. Hydrochloric acid | |
| 46. |
Dealkalization results in removal of all the ions from the wastewater. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 47. |
Which of the following represents the oxygen sag curve in the following figure? |
| A. | Dotted blue line |
| B. | Green curve |
| C. | Yellow curve |
| D. | Red curve |
| Answer» E. | |
| 48. |
The minimum spacing between the bars on fine screen is ____________ |
| A. | 0.3mm |
| B. | 0.9mm |
| C. | 1.5mm |
| D. | 0.5mm |
| Answer» D. 0.5mm | |
| 49. |
The decomposition of nitrogenous organic matter in the absence of oxygen gives __________ |
| A. | Nitrites and water |
| B. | Carbon dioxide and water |
| C. | Nitrates and ammonia |
| D. | Nitrogen, ammonia and organic acids |
| Answer» E. | |
| 50. |
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 | |