MCQOPTIONS
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MCQOPTIONS
This section includes 80 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The minimum diameter of working chamber for a circular manhole is |
| A. | 0.8m |
| B. | 0.9m |
| C. | 1m |
| D. | 1.2m |
| Answer» E. | |
| 2. |
Ventilating columns are provided at intervals of ______ along the sewer lines. |
| A. | 30m |
| B. | 50m |
| C. | 100m |
| D. | 150m |
| Answer» E. | |
| 3. |
State whether the following statement is true or false.Asbestos cement sewer offers resistant to sulfide corrosion. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
State whether the following statement is true or false.Semi elliptical sections of sewer is not used nowadays. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Which of the following is called as depressed sewer? |
| A. | Lateral sewer |
| B. | Outfall sewer |
| C. | Inverted siphon |
| D. | Main sewer |
| Answer» D. Main sewer | |
| 6. |
The diameter of the sewer is _____ the diameter of ventilating column. |
| A. | Equal to |
| B. | 2 times |
| C. | 3 times |
| D. | 4 times |
| Answer» D. 4 times | |
| 7. |
Which of the following pump is used for removal of grit? |
| A. | Centrifugal pump |
| B. | Pneumatic ejector |
| C. | Rotary screw pump |
| D. | Air lift pump |
| Answer» D. Air lift pump | |
| 8. |
Which of the following is called as a ventilated discharge pipe? |
| A. | Branch sewer pipe |
| B. | Soil vent pipe |
| C. | Outfall sewer pipe |
| D. | Main sewer pipe |
| Answer» C. Outfall sewer pipe | |
| 9. |
Negative projecting condition is a type of ______ condition. |
| A. | Trench ditch |
| B. | Trench |
| C. | Tunnel |
| D. | Embankment |
| Answer» E. | |
| 10. |
The thickness of the manhole frame is |
| A. | 10cm |
| B. | 15cm |
| C. | 20cm |
| D. | 40cm |
| Answer» D. 40cm | |
| 11. |
_______ denotes the characteristic size of circular cross section of sewer. |
| A. | DN |
| B. | MN |
| C. | QW |
| D. | SE |
| Answer» B. MN | |
| 12. |
The value of Kutter's coefficient for cast iron is |
| A. | 0.02 |
| B. | 0.012 |
| C. | 0.12 |
| D. | 0.13 |
| Answer» C. 0.12 | |
| 13. |
The value of Bazen's constant for good earthen channels is |
| A. | 0.12 |
| B. | 1.54 |
| C. | 0.5 |
| D. | 3.17 |
| Answer» D. 3.17 | |
| 14. |
Which of the following conduit material has the maximum Kutter's coefficient in terms of good surface? |
| A. | Brick |
| B. | Salt glazed stoneware |
| C. | Cast iron |
| D. | Galvanized iron |
| Answer» B. Salt glazed stoneware | |
| 15. |
The radius of invert of the standard section of Egg shaped sewer is ____ of the new shaped section. |
| A. | Twice |
| B. | Thrice |
| C. | Half |
| D. | Equivalent |
| Answer» B. Thrice | |
| 16. |
Which of the following has minimum manning's coefficient in terms of fair interior surface? |
| A. | Plastic smooths |
| B. | Asbestos cement |
| C. | Brick |
| D. | Cement concrete |
| Answer» B. Asbestos cement | |
| 17. |
Which of the following order is correct regarding Hazen and William's coefficient?1. Steel pipe2. Cement lined pipe3. Wood stave pipe4. Asbestos cement pipe |
| A. | 1 > 2 > 3 > 4 |
| B. | 1 > 3 > 2 >4 |
| C. | 4 > 2 >3 > 1 |
| D. | 4 > 3 > 2 > 1 |
| Answer» E. | |
| 18. |
State whether the following statement is true or false.There is less deposition of waste in ovoid cross-section. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
State whether the following statement is true of false.Egg shaped sewers are more suitable in a combined system during dry weather flow. |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
The ratio of the width of the standard section and new shaped section of Egg shaped section is |
| A. | 1:2 |
| B. | 2:1 |
| C. | 1:1 |
| D. | 1:3 |
| Answer» D. 1:3 | |
| 21. |
_______ is the velocity at which the solid matter in sewage remained in suspended form. |
| A. | Settling velocity |
| B. | Self cleansing velocity |
| C. | Mean velocity |
| D. | Non Scouring velocity |
| Answer» C. Mean velocity | |
| 22. |
The non scouring velocity required for cast iron sewer pipes is |
| A. | 50cm/Sec |
| B. | 350cm/Sec |
| C. | 160cm/Sec |
| D. | 220cm/Sec |
| Answer» C. 160cm/Sec | |
| 23. |
The expression of the Chezy's formula is given by |
| A. | V = C/RS |
| B. | V = CRS2 |
| C. | V = C (RS) 1/2 |
| D. | V = C/ (RS) 1/2 |
| Answer» D. V = C/ (RS) 1/2 | |
| 24. |
Which of the following is the expression of the Manning's formula? |
| A. | V = R1/3 S1/2/ N |
| B. | V = R2/3 S2/ N |
| C. | V = R2/3 S1/2/ N |
| D. | V = R2/3 S1/2 |
| Answer» D. V = R2/3 S1/2 | |
| 25. |
Which of the following sewer is called as ovoid sewer? |
| A. | Asbestos cement sewer |
| B. | Egg shaped sewer |
| C. | Plain cement sewer |
| D. | Salt glazed sewer |
| Answer» C. Plain cement sewer | |
| 26. |
The manhole in which inclined pipe for transfer of sewage from branch to main sewer is |
| A. | Deep manhole |
| B. | Ramp |
| C. | Drop manhole |
| D. | Normal manhole |
| Answer» C. Drop manhole | |
| 27. |
Which part of pump chamber allows to easily disconnect from the pipeline? |
| A. | Gate valve |
| B. | Check valve |
| C. | Union |
| D. | Pump lift chain |
| Answer» D. Pump lift chain | |
| 28. |
_______ columns are used for the ventilation of sewer. |
| A. | Aeration columns |
| B. | Inclined columns |
| C. | Ventilating columns |
| D. | Vertical columns |
| Answer» D. Vertical columns | |
| 29. |
The range of diameter of cast iron sewer is |
| A. | 20-100mm |
| B. | 150-750mm |
| C. | 40-250mm |
| D. | 100-250mm |
| Answer» C. 40-250mm | |
| 30. |
How many types of joints are present in the sewer? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 31. |
The sludge treatment process to increase the solid content of sludge is |
| A. | Dewatering |
| B. | Thickening |
| C. | Conditioning |
| D. | Drying |
| Answer» C. Conditioning | |
| 32. |
In which sludge treatment process, the sludge is treated with chemicals? |
| A. | Dewatering |
| B. | Thickening |
| C. | Conditioning |
| D. | Drying |
| Answer» D. Drying | |
| 33. |
The high rate sludge digestion tanks are used when the capacity of the tank is ____ million liters per day. |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 10 |
| Answer» D. 10 | |
| 34. |
The device used for the aeration in the combined aerator is |
| A. | Header pipe |
| B. | Diffuser plate and paddles |
| C. | Cone with spiral vanes |
| D. | Diffuser plate |
| Answer» C. Cone with spiral vanes | |
| 35. |
Simplex aerator is a type of |
| A. | Combined aerator |
| B. | Mechanical aerator |
| C. | Ridge and furrow type aerator |
| D. | Spiral flow type aerator |
| Answer» C. Ridge and furrow type aerator | |
| 36. |
The maximum quantity of air required in diffused aerator is ______ m3 per million litres of sewage. |
| A. | 4000 |
| B. | 5000 |
| C. | 6000 |
| D. | 8000 |
| Answer» E. | |
| 37. |
Which of the following is the cause of rising sludge? |
| A. | Sedimentation |
| B. | Denitrification |
| C. | Chlorination |
| D. | Flocculation |
| Answer» C. Chlorination | |
| 38. |
The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is |
| A. | 0.92 |
| B. | 0.8 |
| C. | 0.99 |
| D. | 0.78 |
| Answer» B. 0.8 | |
| 39. |
Which gas is produced in aerobic digestion of sludge? |
| A. | NO2 |
| B. | CO2 |
| C. | O2 |
| D. | H2S |
| Answer» C. O2 | |
| 40. |
The hydrogen sulfide gas formed during the filtration of sewage can be removed by |
| A. | Carbonation |
| B. | Chlorination |
| C. | Addition of lime |
| D. | Titration with potassium dichromate |
| Answer» C. Addition of lime | |
| 41. |
Which of the following is not a drying bed? |
| A. | Wedwire beds |
| B. | Artificial media |
| C. | Filter press |
| D. | Conventional sand |
| Answer» D. Conventional sand | |
| 42. |
The minimum weir loading rate of primary clarifier is ____m3/m/day. |
| A. | 125000 |
| B. | 50000 |
| C. | 10000 |
| D. | 20000 |
| Answer» B. 50000 | |
| 43. |
In which sludge treatment process, the organic solids are converted into more stable form? |
| A. | Dewatering |
| B. | Thickening |
| C. | Digestion |
| D. | Conditioning |
| Answer» D. Conditioning | |
| 44. |
Which of the following has minimum hydraulic retention time? |
| A. | Conventional process |
| B. | Extended process |
| C. | Modified aeration process |
| D. | Complete mix process |
| Answer» D. Complete mix process | |
| 45. |
The speed at which the bubbles are formed in the simplex aerator |
| A. | 15rpm |
| B. | 20rpm |
| C. | 60rpm |
| D. | 30rpm |
| Answer» D. 30rpm | |
| 46. |
The minimum detention period of combined aerator is |
| A. | 1hour |
| B. | 2hours |
| C. | 3hours |
| D. | 4hours |
| Answer» D. 4hours | |
| 47. |
In which of the following process, the sludge is dried and disposed in land? |
| A. | Centrifugation |
| B. | Drying lagoon |
| C. | Drying bed |
| D. | Vacuum filter |
| Answer» D. Vacuum filter | |
| 48. |
State whether the following statement is true or false.The intermittent sand filters have better BOD removal efficiency than trickling filters. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
_________ is the time at which sewage is detained in the aeration tank. |
| A. | Average time |
| B. | Detention time |
| C. | Aeration period |
| D. | Reaeration period |
| Answer» D. Reaeration period | |
| 50. |
The surface loading rate of a secondary clarifier is ______ litres/m2/day |
| A. | 1000 |
| B. | 10000 |
| C. | 20000 |
| D. | 40000 |
| Answer» E. | |