MCQOPTIONS
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MCQOPTIONS
This section includes 344 Mcqs, each offering curated multiple-choice questions to sharpen your Surveying knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
5 days-biochemical oxygen demand (BOD₅) is taken at a temperature of |
| A. | 0°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C. |
| Answer» D. 25°C. | |
| 2. |
Which one of the following tests is used for testing sewer pipes : |
| A. | water test |
| B. | ball test |
| C. | mirror test |
| D. | all of these. |
| Answer» E. | |
| 3. |
1/3rd or 1/4th extra space is left in sewer pipes at maximum discharge for |
| A. | low estimates of the average and maximum flows |
| B. | large scale infiltration of storm water |
| C. | unexpected increase in population |
| D. | all the above. |
| Answer» E. | |
| 4. |
Dry weather flow is : |
| A. | average daily rate of flow |
| B. | average monthly rate of flow |
| C. | average annual rate of flow |
| D. | water supply allowance per capita |
| Answer» E. | |
| 5. |
'Cowl' is provided at |
| A. | lower end of ventilating column |
| B. | upper end of ventilating column |
| C. | upper end of the manhole |
| D. | first step in manhole. |
| Answer» C. upper end of the manhole | |
| 6. |
Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is |
| A. | 100 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» E. | |
| 7. |
Which one of the following statements regarding septic tanks is wrong : |
| A. | a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided |
| B. | the outlet invert level is kept 5 to 7.5 cm below the inlet invert level |
| C. | the minimum width of septic level is 90 cm |
| D. | the depth of tank is kept equal to its width. |
| Answer» E. | |
| 8. |
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed |
| A. | 3 PPm |
| B. | 4 PPm |
| C. | 5 PPm |
| D. | 10 ppm. |
| Answer» C. 5 PPm | |
| 9. |
Faculative bacterias survive in |
| A. | the presence of oxygen |
| B. | the absence of oxygen |
| C. | both cases (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 10. |
The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is |
| A. | 25% |
| B. | 50% |
| C. | 10% |
| D. | 5%. |
| Answer» C. 10% | |
| 11. |
Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R) : It helps to accommodate the scum in the septic tank. |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 12. |
The rate of accumulation of sludge in septic tanks is recommended as |
| A. | 30 litres/person/year |
| B. | 25 litres/person/year |
| C. | 30 litres/person/month |
| D. | 25 litres/person/month. |
| Answer» B. 25 litres/person/year | |
| 13. |
Which one of the following gases is most significant as air pollutant |
| A. | Carbondioxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphurdioxide. |
| Answer» E. | |
| 14. |
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is |
| A. | πD/2 |
| B. | πD/4 |
| C. | πD/3 |
| D. | πD. |
| Answer» D. πD. | |
| 15. |
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is |
| A. | 100 mg/l |
| B. | 200 mg/l |
| C. | 300 mg/l |
| D. | 400 mg/l. |
| Answer» D. 400 mg/l. | |
| 16. |
Stoneware sewers are available in size |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | all the above. |
| Answer» E. | |
| 17. |
D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is |
| A. | πD^8/3 = 4 b^8/3 |
| B. | πD^3/8 = 4 b^3/8 |
| C. | πD^2/3 = 4 b^2/3 |
| D. | πD^3/2 = 4 b^3/2 |
| Answer» B. πD^3/8 = 4 b^3/8 | |
| 18. |
In olden days the type of section adopted in trunk and out fall sewers was |
| A. | parabolic shaped |
| B. | horse shoe shaped |
| C. | egg shaped |
| D. | circular shaped. |
| Answer» C. egg shaped | |
| 19. |
Pathogens (or pathogentic bacterias) in water may cause |
| A. | typhoid |
| B. | cholera |
| C. | dysentery |
| D. | all the above. |
| Answer» E. | |
| 20. |
If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is |
| A. | 100 cm |
| B. | 90 cm |
| C. | 80 cm |
| D. | 50 cm. |
| Answer» B. 90 cm | |
| 21. |
If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is |
| A. | D |
| B. | 1.25 D |
| C. | 1.5 D |
| D. | 1.75 D |
| Answer» D. 1.75 D | |
| 22. |
The normal values of over flow rates for sedimentation tanks using coagulent, ranges between |
| A. | 25, 000 to 35, 000 litres/sqm/day |
| B. | 40, 000 to 50, 000 litres/sqm/day |
| C. | 50, 000 to 60, 000 litres/sqm/day |
| D. | 80, 000 to 100, 000 litres/sqm/day |
| Answer» D. 80, 000 to 100, 000 litres/sqm/day | |
| 23. |
If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is |
| A. | D' = 0.64 D |
| B. | D' = 0.74 D |
| C. | D' = 0.84 D |
| D. | D' = 0.94 D. |
| Answer» D. D' = 0.94 D. | |
| 24. |
Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer. |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 25. |
If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D. |
| Answer» E. | |
| 26. |
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of |
| A. | Hydrochloric acid |
| B. | Sulphuric acid |
| C. | Nitric acid |
| D. | Citric acid. |
| Answer» C. Nitric acid | |
| 27. |
The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is |
| A. | 10 |
| B. | 15 |
| C. | 20 |
| D. | 25 |
| Answer» D. 25 | |
| 28. |
If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» C. Methane | |
| 29. |
If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is |
| A. | π |
| B. | π/2 |
| C. | π/3 |
| D. | 2π/3 |
| Answer» E. | |
| 30. |
In Chezy's formula V = C √rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is |
| A. | D |
| B. | D/2 |
| C. | D/3 |
| D. | D/4 |
| Answer» E. | |
| 31. |
Bottom openings 15 cm x 15 cm in the standing baffle wall are provided |
| A. | 15 cm c/c |
| B. | 22.5 cm c/c |
| C. | 30 cm c/c |
| D. | 50 cm c/c. |
| Answer» C. 30 cm c/c | |
| 32. |
Pick up the in-correct statement from the following : |
| A. | Manholes are provided in sewer pipes at suitable intervals |
| B. | Catch basins are generally provided in sewers for carrying drainage discharge |
| C. | Inlets are generally provided in all sewers |
| D. | None of these. |
| Answer» D. None of these. | |
| 33. |
Kjedahl nitrogen is a mixture of |
| A. | ammonia and nitrogen |
| B. | nitrogen and organic nitrogen |
| C. | organic nitrogen and ammonia |
| D. | all the above. |
| Answer» E. | |
| 34. |
Assertion (A) : The determination of pH value of sewerage is important. Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value. |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 35. |
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is |
| A. | 1045 mm |
| B. | 1065 mm |
| C. | 1075 mm |
| D. | 1095 mm. |
| Answer» E. | |
| 36. |
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is |
| A. | 0.30 m/sec |
| B. | 0.35 m/sec |
| C. | 0.40 m/sec |
| D. | 0.45 m/sec |
| Answer» E. | |
| 37. |
The ratio of minimum hourly flow to the average flow of sewage is |
| A. | 1/4 |
| B. | 1/3 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» C. 1/2 | |
| 38. |
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to |
| A. | initial demand |
| B. | first stage demand |
| C. | carbonaceous demand |
| D. | all of these. |
| Answer» E. | |
| 39. |
Dilution method of disposing off sewage, is not preferred to |
| A. | when sewage is fresh |
| B. | when diluting water has high dissolved oxygen content |
| C. | when diluting water is used for water supply near the point of sewage disposed |
| D. | when the diluting water is having flow currents |
| Answer» D. when the diluting water is having flow currents | |
| 40. |
For the COD test of sewage, organic matter is oxidised by K₂Cr₂0₇ in the presence of |
| A. | H₂SO₄ |
| B. | HNO₃ |
| C. | HCl |
| D. | none of these. |
| Answer» B. HNO₃ | |
| 41. |
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is |
| A. | cast iron sewers |
| B. | cement concrete sewers |
| C. | glazed bricks sewers |
| D. | stone ware sewers. |
| Answer» D. stone ware sewers. | |
| 42. |
The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is |
| A. | 204 cu m |
| B. | 208 cu m |
| C. | 212 cu m |
| D. | 216 cu m |
| Answer» E. | |
| 43. |
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept |
| A. | 10.0 |
| B. | 5.0 |
| C. | 2.0 |
| D. | 0.25 |
| Answer» E. | |
| 44. |
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | none of these. |
| Answer» D. none of these. | |
| 45. |
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by |
| A. | Bazin |
| B. | Crimp and Bruge |
| C. | William-Hazen |
| D. | Kutter. |
| Answer» C. William-Hazen | |
| 46. |
In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is |
| A. | separate system |
| B. | combined system |
| C. | partially combined system |
| D. | none of these. |
| Answer» C. partially combined system | |
| 47. |
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is |
| A. | 0.68 m |
| B. | 0.88 m |
| C. | 1.36 m |
| D. | 1.76 m. |
| Answer» D. 1.76 m. | |
| 48. |
Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities. |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 49. |
The non-clog pump which permits solid matter to pass out with the liquid sewage, is |
| A. | centrifugal pump |
| B. | reciprocating pump |
| C. | pneumatic ejector |
| D. | none of these. |
| Answer» B. reciprocating pump | |
| 50. |
For having central angle α, the area of cross-section of sewers running partially full, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |