MCQOPTIONS
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MCQOPTIONS
This section includes 44 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is? |
| A. | Centrifugal pump |
| B. | Pneumatic ejector |
| C. | Reciprocating pump |
| D. | None of these |
| Answer» B. Pneumatic ejector | |
| 2. |
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 3. |
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is |
| A. | 30 minutes |
| B. | 1 hour |
| C. | 1 hour and 30 minutes |
| D. | 2 hours |
| Answer» E. | |
| 4. |
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, selfcleaning velocity recommended for Indian conditions, is |
| A. | 0.50 m/sec |
| B. | 0.60 m/sec |
| C. | 0.70 m/sec |
| D. | 0.75 m/sec |
| Answer» E. | |
| 5. |
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 | |
| 6. |
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be |
| A. | 0.9 cm |
| B. | 1.2 m |
| C. | 1.5 m |
| D. | > 1.5 m |
| Answer» E. | |
| 7. |
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 | |
| 8. |
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. | |
| 9. |
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. | |
| 10. |
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is |
| A. | d (0.011d + 0.785H)/Q |
| B. | d (0.022d + 0.085H)/Q |
| C. | d (0.785d + 0.011H)/Q |
| D. | d (0.285d + 0.011H)/Q |
| Answer» B. d (0.022d + 0.085H)/Q | |
| 11. |
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called |
| A. | Imhoff tanks |
| B. | Trickling filters |
| C. | Sludge sedimentation tanks |
| D. | None of these |
| Answer» C. Sludge sedimentation tanks | |
| 12. |
If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by |
| A. | Q = V/12N |
| B. | Q = V/24N |
| C. | Q = V/265N |
| D. | None of these |
| Answer» D. None of these | |
| 13. |
Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is |
| A. | Q = 1115 (p/5 + 20) |
| B. | Q = 1640 (1 - 0.01 ) |
| C. | Q = 3180 |
| D. | None of these |
| Answer» D. None of these | |
| 14. |
If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is |
| A. | 1880 kilo litres |
| B. | 2880 kilo litres |
| C. | 3880 kilo litres |
| D. | 4880 kilo litres |
| Answer» C. 3880 kilo litres | |
| 15. |
When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied |
| A. | By pumping system |
| B. | By gravitational system |
| C. | Both (a) and (b) |
| D. | All the above |
| Answer» C. Both (a) and (b) | |
| 16. |
To maintain aerobic biological activity, the moisture content of the compost mass should be about |
| A. | 45 % |
| B. | 50 % |
| C. | 55 % |
| D. | 60 % |
| Answer» D. 60 % | |
| 17. |
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is |
| A. | Q/(B D) |
| B. | Q/(L D) |
| C. | Q/L |
| D. | Q/(B L) |
| Answer» E. | |
| 18. |
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is |
| A. | 25 % (B) (C) (D) |
| B. | 50 % |
| C. | 10 % |
| D. | 5 % |
| Answer» C. 10 % | |
| 19. |
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 Bruges |
| C. | William-Hazen |
| D. | Kutter |
| Answer» C. William-Hazen | |
| 20. |
If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T C, according to Stoke's law, is |
| A. | V = 418 (G - 1) d [(3T + 70)/100] |
| B. | V = 418 (G - 1) d [(3T - 70)/100] |
| C. | V = 418 (G - 1) d [(2T + 70)/100] |
| D. | V = 418 (G - 1) d 4 [(3T + 70)/100] |
| Answer» B. V = 418 (G - 1) d [(3T - 70)/100] | |
| 21. |
If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is |
| A. | / |
| B. | /2 |
| C. | dp/2t |
| D. | dt/2p |
| Answer» D. dt/2p | |
| 22. |
The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed |
| A. | 3 |
| B. | 5 |
| C. | 7 |
| D. | 9 |
| Answer» B. 5 | |
| 23. |
When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is |
| A. | Elevated tank |
| B. | Ground source reservoir |
| C. | Intz tank |
| D. | Stand pipe |
| Answer» B. Ground source reservoir | |
| 24. |
An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as |
| A. | Aquifer |
| B. | Aquiclude |
| C. | Aquifuge |
| D. | None of these |
| Answer» C. Aquifuge | |
| 25. |
The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept |
| A. | At the level of water of the source |
| B. | At the bottom of water of the source |
| C. | At about 2.5 m above the bottom |
| D. | None of these |
| Answer» D. None of these | |
| 26. |
For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is |
| A. | t2 = r2/r1 t1 |
| B. | t2 = (r2/r1) t1 |
| C. | t2 = (r2/r1)3 t1 |
| D. | t2 = (r2/r1) t12 |
| Answer» C. t2 = (r2/r1)3 t1 | |
| 27. |
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through nonmonsoon periods, is |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» E. | |
| 28. |
Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of |
| A. | Increasing |
| B. | Decreasing |
| C. | Constant |
| D. | All the above |
| Answer» B. Decreasing | |
| 29. |
In areas where rainy season is limited to a few months, the type of sewerage system recommended is |
| A. | Combined system |
| B. | Partially separate system |
| C. | Separate system |
| D. | None of these |
| Answer» D. None of these | |
| 30. |
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 | |
| 31. |
If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by |
| A. | Q = 1.758 102 API (B) (C) (D) |
| B. | Q = 2.758 102 API |
| C. | Q = 2.758 103 API |
| D. | Q = 2.758 103 A/PI |
| Answer» D. Q = 2.758 103 A/PI | |
| 32. |
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is |
| A. | 1.095 |
| B. | 1.085 |
| C. | 1.075 |
| D. | 1.065 |
| Answer» B. 1.085 | |
| 33. |
The duration of contact of chlorine with water before it is served to the first consumer, should be at least |
| A. | 10 to 15 minutes |
| B. | 15 to 20 minutes |
| C. | 20 to 30 minutes |
| D. | 30 to 40 minutes |
| Answer» D. 30 to 40 minutes | |
| 34. |
For determining the velocity of flow of underground water, the most commonly used nonempirical formula is |
| A. | Darcy's formula |
| B. | Slichter's formula |
| C. | Hazen's formula |
| D. | Lacy's formula |
| Answer» B. Slichter's formula | |
| 35. |
Hazen's formula VS = 418 (GS - Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter |
| A. | Less than 0.01 mm |
| B. | Less than 0.05 mm |
| C. | Less than 0.1 mm |
| D. | Greater than 0.1 mm |
| Answer» E. | |
| 36. |
If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is |
| A. | n (pd/2f) |
| B. | (1/n) (pd/2f) |
| C. | (1/n) (pd/3f) |
| D. | (1/n) (pf/d) |
| Answer» C. (1/n) (pd/3f) | |
| 37. |
For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula |
| A. | D = 0.22 |
| B. | D = 1.22 |
| C. | D = 2.22 |
| D. | D = 3.22 |
| Answer» C. D = 2.22 | |
| 38. |
A strainer type well sunk through three previous layers intervened by three impervious aquicludes, draws water from |
| A. | Top most pervious layer |
| B. | Central pervious layer |
| C. | Lowest pervious layer |
| D. | All the pervious layers |
| Answer» E. | |
| 39. |
If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula Q = 1135 [(P/5) + 10] is suggested by |
| A. | National Board of fire under-writers |
| B. | Freeman |
| C. | Kuichling |
| D. | None of these |
| Answer» C. Kuichling | |
| 40. |
Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided |
| A. | Silica |
| B. | Mud |
| C. | Clay |
| D. | Organic matter |
| Answer» B. Mud | |
| 41. |
The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Deep well turbine pump |
| D. | None of these |
| Answer» D. None of these | |
| 42. |
While designing a water supply of an industrial township, industrial and commercial water demand of total supply, is assumed |
| A. | 10 % (B) (C) (D) |
| B. | 10 to 15 % |
| C. | 15 to 20 % |
| D. | 20 to 25 % |
| Answer» E. | |
| 43. |
The average domestic consumption under normal conditions in an Indian city per day per person, is |
| A. | 105 litres |
| B. | 115 litres |
| C. | 125 litres |
| D. | 135 litres |
| Answer» E. | |
| 44. |
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called |
| A. | Inverted syphon |
| B. | Depressed sewer |
| C. | Sag pipe |
| D. | all of these |
| Answer» E. | |