MCQOPTIONS
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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.
| 501. |
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 | |
| 502. |
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 | |
| 503. |
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 | |
| 504. |
A manhole is classified as shallow if its depth is between |
| A. | 0.4 to 0.5 m |
| B. | 0.5 to 0.7 m |
| C. | 0.7 to 0.9 m |
| D. | 0.9 to 1.20 m |
| Answer» D. 0.9 to 1.20 m | |
| 505. |
The sewerage system originates from |
| A. | house sewers |
| B. | lateral sewers |
| C. | branch sewers |
| D. | main sewers |
| Answer» B. lateral sewers | |
| 506. |
Hume steel pipes are |
| A. | steel pipes |
| B. | R.C.C. pipes |
| C. | steel shell coated from inside with cement mortar |
| D. | steel shell coated from outside with cement mortar |
| Answer» E. | |
| 507. |
During putrifaction process of sewage the gas given off, is |
| A. | carbon dioxide |
| B. | hydrogen |
| C. | ammonia |
| D. | methane |
| Answer» E. | |
| 508. |
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient, |
| A. | is only provided |
| B. | is doubled |
| C. | is trebled |
| D. | is not enough. |
| Answer» C. is trebled | |
| 509. |
'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 | |
| 510. |
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. | |
| 511. |
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 | |
| 512. |
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of |
| A. | Carbondioxide gas |
| B. | Hydrogen sulphide gas |
| C. | Methane gas |
| D. | Petrol vapours. |
| Answer» D. Petrol vapours. | |
| 513. |
The most effective arrangement for diverting excess storm water into a natural drainage, is |
| A. | leaping weir |
| B. | overflow weir |
| C. | siphon spill way |
| D. | none of these. |
| Answer» D. none of these. | |
| 514. |
Depletion of ozone layer in the outer atmosphere may cause |
| A. | lung cancer |
| B. | skin cancer |
| C. | bronchitis |
| D. | heart disorder. |
| Answer» C. bronchitis | |
| 515. |
The sewers |
| A. | must be of adequate size to avoid over flow |
| B. | must flow under gravity to full |
| C. | must be laid at least 2 to 3 m deep to collect /water from the basements |
| D. | all the above. |
| Answer» E. | |
| 516. |
The recommended detention period for grit chambers is |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes. |
| Answer» B. 2 minutes | |
| 517. |
For trunk and out-fall, the type of sewers generally used, is |
| A. | standard egg shaped |
| B. | circular shaped |
| C. | horse shoe shaped |
| D. | parabolic shaped |
| Answer» D. parabolic shaped | |
| 518. |
Imhoff cone is used to measure |
| A. | total organic solids |
| B. | total solids |
| C. | total in organic solids |
| D. | settleable solids. |
| Answer» E. | |
| 519. |
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. | |
| 520. |
With self cleansing velocity in sewers |
| A. | silting occurs at bottom |
| B. | scouring occurs at bottom |
| C. | both silting and scouring occur at bottom |
| D. | neither silting nor scouring occurs at bottom. |
| Answer» E. | |
| 521. |
If γw is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is |
| A. | γw . r . S |
| B. | γw r1/2 . S |
| C. | γw r S |
| D. | γw r2/3 S |
| Answer» B. Œ≥w r1/2 . S | |
| 522. |
The flow velocity in detritus tanks is |
| A. | 0.05 m/sec |
| B. | 0.09 m/sec |
| C. | 1.25 m/sec |
| D. | none of these. |
| Answer» C. 1.25 m/sec | |
| 523. |
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 | |
| 524. |
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. | |
| 525. |
Setting out the alignments of sewers may start from |
| A. | city |
| B. | out-fall |
| C. | tail end |
| D. | any point. |
| Answer» D. any point. | |
| 526. |
During preliminary treatment of a sewage |
| A. | Oil and grease are removed from skimming tanks |
| B. | Floating materials are removed by screening |
| C. | Girt and sand are removed by girt chambers |
| D. | All the above. |
| Answer» E. | |
| 527. |
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 | |
| 528. |
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is |
| A. | 2 hours |
| B. | 4 hours |
| C. | 6 hours |
| D. | 8 hours. |
| Answer» E. | |
| 529. |
Skimming tanks are |
| A. | used to remove the grease and oil |
| B. | those from which sludge is skimmed out |
| C. | tanks provided with self-cleansing screens |
| D. | improved version of grit chambers. |
| Answer» B. those from which sludge is skimmed out | |
| 530. |
The rate of accumulation of sludge per person per year, is |
| A. | 10 litres |
| B. | 15 litres |
| C. | 20 litres |
| D. | 25 litres |
| Answer» D. 25 litres | |
| 531. |
If the diameter of a sewer is 150 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» C. 1 in 120 | |
| 532. |
1000 kg of sewage contains |
| A. | 0.112 kg in suspension |
| B. | 0.112 kg in solution |
| C. | 0.225 kg in solution |
| D. | 0.450 kg in suspension |
| Answer» E. | |
| 533. |
Fresh sewage is generally |
| A. | alkaline |
| B. | acidic |
| C. | highly decomposed |
| D. | a source of objectionable odour. |
| Answer» B. acidic | |
| 534. |
The spacing of bars of perforations of fine screens used for the treatment of sewage, is |
| A. | 2 to 3 mm |
| B. | 3 to 5 mm |
| C. | 5 to 8 mm |
| D. | 8 to 10 mm. |
| Answer» B. 3 to 5 mm | |
| 535. |
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is |
| A. | 10 cm |
| B. | 12 cm |
| C. | 15 cm |
| D. | 18 cm |
| Answer» D. 18 cm | |
| 536. |
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. | |
| 537. |
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 | |
| 538. |
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. | |
| 539. |
Large diameter sewers subjected to external pressure alone, are reinforced |
| A. | near the inner surface of the pipe |
| B. | near the outer surface of the pipe |
| C. | both (a) and (b) |
| D. | with elliptical cage |
| Answer» E. | |
| 540. |
In a grit chamber of a sewage treatment plant, |
| A. | flow velocity 0.15 m to 0.3 m/sec is kept |
| B. | depth of 0.9 m to 1.20 m is kept |
| C. | one minute of detention period is kept |
| D. | all the above. |
| Answer» E. | |
| 541. |
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). | |
| 542. |
The gradient of sewers depends upon |
| A. | velocity of flow |
| B. | diameter of the sewer |
| C. | discharge |
| D. | all the above. |
| Answer» E. | |
| 543. |
PH value of sludge during alkaline regression stage, is |
| A. | more than 7 |
| B. | less than 7 |
| C. | less than 6 |
| D. | more than 6. |
| Answer» B. less than 7 | |
| 544. |
The Chezy's constant C in the formula V = C rs depends upon |
| A. | size of the sewer |
| B. | shape of the sewer |
| C. | roughness of sewer surface |
| D. | hydraulic characteristics of sewer |
| Answer» E. | |
| 545. |
The algae dies out in the zone of |
| A. | degradation |
| B. | active decomposition |
| C. | recovery |
| D. | cleaner water. |
| Answer» B. active decomposition | |
| 546. |
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. | |
| 547. |
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 | |
| 548. |
Before discharging the foul sewage into rivers, it is generally treated by |
| A. | screening |
| B. | sedimentation |
| C. | oxidation |
| D. | sludge digestion and disinfection |
| Answer» E. | |
| 549. |
The stone ware sewers |
| A. | are used for carrying sewage and drainage from houses |
| B. | are manufactured from clays and shales |
| C. | after casting are dried and burnt at temperature 150°C, 700°C and 1200°C |
| D. | are generally provided with a water proof cover by vaporising sodium chloride |
| Answer» E. | |
| 550. |
Sluge banks are formed if sewage is disposed of in |
| A. | rivers |
| B. | seas |
| C. | lakes |
| D. | none of these. |
| Answer» C. lakes | |