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MCQOPTIONS
This section includes 641 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time |
| A. | 100 mm dia. |
| B. | 150 mm dia. |
| C. | 225 mm dia. |
| D. | all of these. |
| Answer» D. all of these. | |
| 602. |
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 | |
| 603. |
The underground sewers are more subjected to |
| A. | tensile force |
| B. | compressive force |
| C. | bending force |
| D. | shearing force. |
| Answer» C. bending force | |
| 604. |
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. | πD8/3 = 4 b8/3 |
| B. | πD3/8 = 4 b3/8 |
| C. | πD2/3 = 4 b2/3 |
| D. | πD3/2 = 4 b3/2 |
| Answer» B. œÄD3/8 = 4 b3/8 | |
| 605. |
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by |
| A. | Kinchling |
| B. | Lloyd Davis |
| C. | Frubling |
| D. | all the above. |
| Answer» E. | |
| 606. |
In septic tanks, decomposition of organic bacteria, is done by |
| A. | anaerobic bacteria |
| B. | aerobic bacteria |
| C. | both types of bacterias |
| D. | none of these. |
| Answer» B. aerobic bacteria | |
| 607. |
In a fully mechanised composting plant, involves |
| A. | mechanized receipt |
| B. | mechanized segregation |
| C. | mechanized pulverising of refuse |
| D. | all of these. |
| Answer» E. | |
| 608. |
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 | |
| 609. |
In 1000 kg of sewage, the total solids approximate |
| A. | 0.5 to 1.0 kg |
| B. | 1 kg to 2.0 kg |
| C. | 5 kg to 7.5 kg |
| D. | 7.5 kg to 10 kg. |
| Answer» B. 1 kg to 2.0 kg | |
| 610. |
A rainfall may be classified as acidic if its pH value is less or equal to |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 6.5 |
| Answer» D. 6.5 | |
| 611. |
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 | |
| 612. |
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 | |
| 613. |
The ratio of design discharge to the surface area of a sedimentation tank is called |
| A. | surface loading |
| B. | overflow rate |
| C. | overflow velocity |
| D. | all of these. |
| Answer» E. | |
| 614. |
In sewers the highest non-scouring velocity is achieved in |
| A. | glazed bricks sewers |
| B. | cast iron sewers |
| C. | cement concrete sewers |
| D. | stone ware sewers. |
| Answer» B. cast iron sewers | |
| 615. |
For sewers, inverted siphon is provided for |
| A. | one pipe |
| B. | two pipes |
| C. | three pipes |
| D. | four pipes. |
| Answer» D. four pipes. | |
| 616. |
The rainfall at any place may be determined by |
| A. | its intensity |
| B. | its direction |
| C. | its frequency |
| D. | all the above. |
| Answer» E. | |
| 617. |
The gas which may cause explosion in sewers, is |
| A. | carbondioxide |
| B. | methane |
| C. | ammonia |
| D. | carbon monoxide. |
| Answer» C. ammonia | |
| 618. |
The intensity of rain is expressed in |
| A. | cm/minute |
| B. | cm/hour |
| C. | cm/day |
| D. | none of these. |
| Answer» C. cm/day | |
| 619. |
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. | |
| 620. |
In SI units the power of sound is represented in |
| A. | kgs |
| B. | joules |
| C. | neutons |
| D. | watts. |
| Answer» E. | |
| 621. |
Drop manholes at the junctions of sewer lines, are provided if |
| A. | invert level of a branch sewer is more than 60 cm that of the main sewer |
| B. | sewer line runs along a main road |
| C. | ordinary manhole cannot be built |
| D. | two sewer lines intersect. |
| Answer» B. sewer line runs along a main road | |
| 622. |
Chlorination of water is done for the removal of |
| A. | bacterias |
| B. | suspended solids |
| C. | sediments |
| D. | hardness. |
| Answer» B. suspended solids | |
| 623. |
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 | |
| 624. |
Aerobic bacterias |
| A. | flourish in the presence of free oxygen |
| B. | consume organic matter as their food |
| C. | oxidise organic matter in sewage |
| D. | All the above. |
| Answer» E. | |
| 625. |
The asbestos cement pipes are generally laid |
| A. | horizontally |
| B. | vertically |
| C. | at an angle of 30° |
| D. | at an angle of 60°. |
| Answer» C. at an angle of 30¬∞ | |
| 626. |
The pH value of fresh sewage is usually |
| A. | equal to 7 |
| B. | more than 7 |
| C. | less than 7 |
| D. | equal to zero. |
| Answer» C. less than 7 | |
| 627. |
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is |
| A. | 2 hours |
| B. | 3 hours |
| C. | 4 hours |
| D. | 5 hours. |
| Answer» D. 5 hours. | |
| 628. |
Sewer pipes need be checked for |
| A. | minimum flow |
| B. | maximum flow |
| C. | both (a) and (b) |
| D. | none of these. |
| Answer» D. none of these. | |
| 629. |
Flocculated particles do not change their |
| A. | size |
| B. | shape |
| C. | weight |
| D. | none of these. |
| Answer» E. | |
| 630. |
To maintain aerobic biological activity, the moisture content of the compost mass should be about |
| A. | 0.45 |
| B. | 0.5 |
| C. | 0.55 |
| D. | 60%. |
| Answer» D. 60%. | |
| 631. |
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 | |
| 632. |
The sewage is pumped up |
| A. | from low lying areas |
| B. | from flat areas |
| C. | from basements |
| D. | across a high ridge |
| Answer» E. | |
| 633. |
The most dangerous pollutant in vehicular emissions is |
| A. | CO |
| B. | SO2 |
| C. | CO2 |
| D. | O3. |
| Answer» B. SO2 | |
| 634. |
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 | |
| 635. |
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is |
| A. | 200 ppm |
| B. | 225 ppm |
| C. | 250 ppm |
| D. | None of these. |
| Answer» D. None of these. | |
| 636. |
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 | |
| 637. |
A nuisance is experienced in diluting water if dilution factor is less than |
| A. | 100 |
| B. | 60 |
| C. | 40 |
| D. | 20 |
| Answer» E. | |
| 638. |
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. | |
| 639. |
Clogging of sewers, is caused due to |
| A. | silting |
| B. | low discharge |
| C. | greasy and oily matters |
| D. | domestic wastes thrown in manholes |
| Answer» E. | |
| 640. |
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 | |
| 641. |
The minimum recommended diameter of sewers, is |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm. |
| Answer» D. 20 cm. | |