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MCQOPTIONS
This section includes 5814 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4651. |
Water content of sewage is about |
| A. | 90% |
| B. | 95% |
| C. | 99.9% |
| D. | 9.9%. |
| Answer» D. 9.9%. | |
| 4652. |
For large sewers, maximum distance between manholes may be |
| A. | 50 m |
| B. | 100 m |
| C. | 200 m |
| D. | 300 m |
| E. | 400 m. |
| Answer» E. 400 m. | |
| 4653. |
The use of coarse screens for the disposal of sewage, may be dispensed with by |
| A. | comminutor |
| B. | shredder |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4654. |
Imhoff cone is used to measure |
| A. | total organic solids |
| B. | total solids |
| C. | total in organic solids |
| D. | settleable solids. |
| Answer» E. | |
| 4655. |
The first stage of neutral process of sludge digestion, is |
| A. | acid fermentation |
| B. | acid regression |
| C. | alkaline fermentation |
| D. | none of these. |
| Answer» B. acid regression | |
| 4656. |
Lead acetate test in sewer manhole is done to test the presence of |
| A. | Methane gas |
| B. | Hydrogen sulphide |
| C. | Carbondioxide gas |
| D. | Diesel vapours. |
| Answer» C. Carbondioxide gas | |
| 4657. |
Dried sewage after treatment is used as |
| A. | fertilizer |
| B. | building material |
| C. | chemical for lowering B.O.D. |
| D. | base material for paints. |
| Answer» B. building material | |
| 4658. |
The sewer pipes |
| A. | carry sewage as gravity conduits |
| B. | are designed for generating self-cleansing velocities at different discharge |
| C. | should resist the wear and tear caused due to abrasion |
| D. | all the above. |
| Answer» E. | |
| 4659. |
For efficient working of a sewer, it must be ensured that |
| A. | minimum velocity of 0.45 m/sec, is maintained at its minimum flow |
| B. | a maximum velocity of 0.90 m/sec, is maintained at its maximum flow |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4660. |
A manhole is generally provided at each |
| A. | bend |
| B. | junction |
| C. | change of gradient |
| D. | change of sewer diameter |
| E. | all the above. |
| Answer» F. | |
| 4661. |
For sewers, inverted siphon is provided for |
| A. | one pipe |
| B. | two pipes |
| C. | three pipes |
| D. | four pipes. |
| Answer» D. four pipes. | |
| 4662. |
The coagulant which is generally not used for treating the sewage, is |
| A. | alum |
| B. | ferric chloride |
| C. | ferric sulphate |
| D. | chlorinated copperas. |
| Answer» B. ferric chloride | |
| 4663. |
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called |
| A. | a heap |
| B. | plateu |
| C. | windrow |
| D. | none of these. |
| Answer» E. | |
| 4664. |
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is |
| A. | 1.39 m |
| B. | 1.49 m |
| C. | 1.59 m |
| D. | 1.69 m |
| E. | 1.79 m. |
| Answer» E. 1.79 m. | |
| 4665. |
Fresh sewage is generally |
| A. | alkaline |
| B. | acidic |
| C. | highly decomposed |
| D. | a source of objectionable odour. |
| Answer» B. acidic | |
| 4666. |
The liquid wastes from kitchens, bath rooms and wash basins, is not called |
| A. | liquid waste |
| B. | sullage |
| C. | sewage |
| D. | none of these. |
| Answer» D. none of these. | |
| 4667. |
The presence of free ammonia in sewage, is detected by |
| A. | boiling |
| B. | adding pottassium permanganate |
| C. | adding sulphuric acid |
| D. | phenol-di-sulphuric acid. |
| Answer» B. adding pottassium permanganate | |
| 4668. |
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known |
| A. | Bio-Chemical Oxygen Demand (B.O.D.) |
| B. | Dissolved Oxygen (D.O.) |
| C. | Chemical Oxygen Demand (C.O.D.) |
| D. | None of these. |
| Answer» C. Chemical Oxygen Demand (C.O.D.) | |
| 4669. |
Sewer ventilating columns are generally placed at |
| A. | distances 150 m to 300 m |
| B. | upper ends of branch sewers |
| C. | every change in the size of sewers |
| D. | all the above. |
| Answer» E. | |
| 4670. |
If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is |
| A. | |
| B. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-1.png"> |
| C. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-2.png"> |
| D. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-3.png"> |
| E. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-4.png"> |
| Answer» E. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.51-4.png"> | |
| 4671. |
A drop manhole is provided if |
| A. | a sewer drops from a height |
| B. | a branch sewer joins the main sewer at higher level |
| C. | a lamp is inserted to check obstruction |
| D. | none of these. |
| Answer» C. a lamp is inserted to check obstruction | |
| 4672. |
Before constructing a dam, the factor to be considered for controlling sedimentation, is |
| A. | selection of dam site |
| B. | construction of check dams |
| C. | providing vegetation screens |
| D. | providing under-sluices in the dam |
| E. | All the above. |
| Answer» F. | |
| 4673. |
A centrifugal pump is required to be primed before starting if it is located |
| A. | at higher level than water level of reservoir |
| B. | at lower level than water level of reservoir |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» B. at lower level than water level of reservoir | |
| 4674. |
The process of passing water through beds of granular materials, is called |
| A. | screening |
| B. | sedimentation |
| C. | filtration |
| D. | none of these. |
| Answer» D. none of these. | |
| 4675. |
The most ideal disinfectant used for drinking water throughout the world, is |
| A. | alum |
| B. | lime |
| C. | chlorine |
| D. | nitrogen |
| E. | ammonia. |
| Answer» D. nitrogen | |
| 4676. |
The maximum pressure which the pipe can withstand without any leakage during hydrostatic pressure test, is called |
| A. | Working pressure |
| B. | Design pressure |
| C. | Test pressure |
| D. | Hydrostatic pressure. |
| Answer» D. Hydrostatic pressure. | |
| 4677. |
Filtration of water is done to remove |
| A. | colour |
| B. | odour |
| C. | turbidity |
| D. | pathogenic bacteria |
| E. | all the above. |
| Answer» D. pathogenic bacteria | |
| 4678. |
The most commonly used chemical for dechlorination of water, is |
| A. | sodium thiosulphate |
| B. | sodium bisulphate |
| C. | sodium sulphite |
| D. | sulphur-dioxide |
| E. | all the above. |
| Answer» D. sulphur-dioxide | |
| 4679. |
For drainage pipes in buildings the test applied before putting them to use, is |
| A. | water test |
| B. | smoke test |
| C. | straightness test |
| D. | all the above. |
| Answer» C. straightness test | |
| 4680. |
Capacity of soil to absorb moisture, is generally known as |
| A. | permeability |
| B. | porosity |
| C. | infiltration capacity |
| D. | perviousness. |
| Answer» D. perviousness. | |
| 4681. |
Maximum permissible velocity 1.5 m/sec, is adopted in drains |
| A. | with beds of rocks and gravels |
| B. | lined with stones |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 4682. |
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20 C, B.O.D. of the sewage is |
| A. | 50 mg/l |
| B. | 100 mg/l |
| C. | 150 mg/l |
| D. | 200 mg/l |
| E. | 250 mg/l. |
| Answer» F. | |
| 4683. |
The clarigesters are |
| A. | circular septic tanks |
| B. | rectangular septic tanks |
| C. | circular Imhoff double tanks with bottom hoppers |
| D. | circular Imhoff double storey tanks without bottom hoppers. |
| Answer» E. | |
| 4684. |
Disposal to sewage in large cities, is done in |
| A. | irrigation |
| B. | dilution |
| C. | oxidation |
| D. | putrifaction. |
| Answer» C. oxidation | |
| 4685. |
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is |
| A. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.173-1.png"> |
| B. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.173-2.png"> |
| C. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.173-3.png"> |
| D. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.173-4.png"> |
| Answer» B. <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.173-2.png"> | |
| 4686. |
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is |
| A. | 2.25 |
| B. | 2.50 |
| C. | 2.55 |
| D. | 2.65 |
| E. | 2.75 |
| Answer» E. 2.75 | |
| 4687. |
For evaporation and measurement of settlable solids, the apparatus used, is |
| A. | a jar |
| B. | a breaker |
| C. | a test tube |
| D. | an Imhoff cone. |
| Answer» E. | |
| 4688. |
In SI units the power of sound is represented in |
| A. | kgs |
| B. | joules |
| C. | neutons |
| D. | watts. |
| Answer» E. | |
| 4689. |
Rate of flow of sewage is generally assumed |
| A. | more than the rate of water supply |
| B. | equal to the rate of water supply |
| C. | less than the rate of water supply |
| D. | at 150 litres per capita. |
| Answer» D. at 150 litres per capita. | |
| 4690. |
In pumping stations, the type of joint generally used, is |
| A. | socket and spigot joint |
| B. | flanged joint |
| C. | expansion joint |
| D. | dresser coupling joint |
| E. | flexible joint. |
| Answer» C. expansion joint | |
| 4691. |
Which one of the following statements is true ? |
| A. | Clays are more porous than sands |
| B. | Pressure of organic matter in a soil decreases the bearing capacity of the soil |
| C. | Aluminous cement is used for foundations in soils with chemical deposits |
| D. | All the above. |
| Answer» E. | |
| 4692. |
The lateral earth pressure on a retaining wall |
| A. | is equal to mass of the soil retained |
| B. | proportional to the depth of the soil |
| C. | proportional to the square of the depth of the soil |
| D. | proportional to the internal friction of the soil |
| E. | none of these. |
| Answer» E. none of these. | |
| 4693. |
Minimum size of the particles of silt soil, is |
| A. | 0.002 mm |
| B. | 0.04 mm |
| C. | 0.06 mm. |
| D. | 0.08 mm |
| E. | 1 mm |
| Answer» B. 0.04 mm | |
| 4694. |
'Shrouding' is essentially provided in |
| A. | strainer type wells |
| B. | cavity type wells |
| C. | slotted type well |
| D. | all the above. |
| Answer» D. all the above. | |
| 4695. |
Maximum threshold number permitted for indicating the odour of public water supplies, is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| E. | 5 |
| Answer» D. 4 | |
| 4696. |
The approximate diameter of a water mains for supplying 7.2 mld with a velocity 1.2 m/sec, is |
| A. | 24 cm |
| B. | 26 cm |
| C. | 28 cm |
| D. | 30 cm |
| E. | 32 cm. |
| Answer» E. 32 cm. | |
| 4697. |
Chemical coagulation of drinking water, is done |
| A. | to settle suspended materials |
| B. | to increase rate of settlement of suspended materials |
| C. | to remove the bacterias |
| D. | none of these. |
| Answer» C. to remove the bacterias | |
| 4698. |
Dissolved carbon dioxide, can be removed from the supply main by |
| A. | sedimentation |
| B. | aeration |
| C. | chlorination |
| D. | coagulation |
| E. | none of these. |
| Answer» C. chlorination | |
| 4699. |
Q is the discharge from an unconfined tube well with depression head S through a pipe of radius rw. If the radius of influence is R, the minimum required length of the strainer, is |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.84-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.84-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.84-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.84-4.png"> |
| Answer» B. <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.84-2.png"> | |
| 4700. |
Manholes are less common in |
| A. | cast iron pipes |
| B. | steel pipes |
| C. | hume steel pipes |
| D. | R.C.C. pipes. |
| Answer» B. steel pipes | |