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.
| 351. |
Kjeldahl nitrogen is a mixture of |
| A. | mmonia and nitrogen |
| B. | itrogen and organic nitrogen |
| C. | rganic nitrogen and ammonia |
| D. | ll the above |
| Answer» E. | |
| 352. |
¾th or ¼th extra space is left in sewer pipes at maximum discharge for |
| A. | ow estimates of the average and maximum flows |
| B. | arge scale infiltration of storm water |
| C. | nexpected increase in population |
| D. | ll the above |
| Answer» E. | |
| 353. |
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by |
| A. | azin |
| B. | rimp and Bruges |
| C. | illiam-Hazen |
| D. | utter |
| Answer» C. illiam-Hazen | |
| 354. |
In sewers the velocity of flow should not be |
| A. | ore than the self-cleansing velocity |
| B. | ess than the self-cleansing velocity |
| C. | ess than 10 m/sec |
| D. | ore than 20 m/sec |
| Answer» C. ess than 10 m/sec | |
| 355. |
Cement concrete sewers are only suitable if non-scouring velocity is between |
| A. | .5 to 3.0 m/sec |
| B. | .0 to 4.0 m/sec |
| C. | .5 to 4.5 m/sec |
| D. | .5 to 5.5 m/sec |
| Answer» B. .0 to 4.0 m/sec | |
| 356. |
Sludge banks are formed if sewage is disposed of in |
| A. | ivers |
| B. | eas |
| C. | akes |
| D. | one of these |
| Answer» C. akes | |
| 357. |
A five 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. | 00 |
| B. | 000 |
| C. | 000 |
| D. | 0000 |
| Answer» E. | |
| 358. |
A drop manhole is provided if |
| A. | sewer drops from a height |
| B. | branch sewer joins the main sewer at higher level |
| C. | lamp is inserted to check obstruction |
| D. | one of these |
| Answer» C. lamp is inserted to check obstruction | |
| 359. |
The formula V = (1/n) r2/3 |
| A. | hezy’s formula |
| B. | azin’s formula |
| C. | utter’s formula |
| D. | anning’s formula |
| Answer» E. | |
| 360. |
‘Cowl’ is provided at |
| A. | ower end of ventilating column |
| B. | pper end of ventilating column |
| C. | pper end of the manhole |
| D. | irst step in manhole |
| Answer» C. pper end of the manhole | |
| 361. |
Which one of the following part of human body withstands minimum radiation? |
| A. | hyroid |
| B. | idneys |
| C. | yes |
| D. | varies/testis |
| Answer» E. | |
| 362. |
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is |
| A. | in 60 |
| B. | in 100 |
| C. | in 120 |
| D. | one of these |
| Answer» B. in 100 | |
| 363. |
Pathogens (or pathogenic bacterias) in water may cause |
| A. | yphoid |
| B. | holera |
| C. | ysentery |
| D. | ll the above |
| Answer» E. | |
| 364. |
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of |
| A. | ydrochloric acid |
| B. | ulphuric acid |
| C. | itric acid |
| D. | itric acid |
| Answer» C. itric acid | |
| 365. |
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of |
| A. | ₂SO₄ |
| B. | NO₃ |
| C. | Cl |
| D. | one of these |
| Answer» B. NO₃ | |
| 366. |
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter |
| A. | ess than 0.01 mm |
| B. | ess than 0.05 mm |
| C. | ess than 0.1 mm |
| D. | reater than 0.1 mm |
| Answer» E. | |
| 367. |
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is |
| A. | /1 |
| B. | /2 |
| C. | /3 |
| D. | /4 |
| Answer» E. | |
| 368. |
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains |
| A. | ydrogen sulphide |
| B. | arbon dioxide |
| C. | ethane |
| D. | xygen |
| Answer» C. ethane | |
| 369. |
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 0.5 |
| B. | 0 |
| C. | 0.5 |
| D. | 0 |
| Answer» B. 0 | |
| 370. |
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. | 00 mm dia |
| B. | 50 mm dia |
| C. | 25 mm dia |
| D. | ll of these |
| Answer» D. ll of these | |
| 371. |
The rational formula for peak drainage discharge, was evolved by |
| A. | ruhling |
| B. | loyd David |
| C. | uichling |
| D. | ll of these |
| Answer» E. | |
| 372. |
In normal conditions, the period for sludge digestion, is |
| A. | 0 days |
| B. | 0 days |
| C. | 0 days |
| D. | 0 days |
| Answer» D. 0 days | |
| 373. |
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is |
| A. | .15 D |
| B. | .25 D |
| C. | .5 D |
| D. | .75 D |
| Answer» D. .75 D | |
| 374. |
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is |
| A. | ² (0.011d + 0.785H)/Q |
| B. | (0.022d + 0.085H)/Q |
| C. | (0.785d + 0.011H)/Q |
| D. | (0.285d + 0.011H)/Q |
| Answer» B. (0.022d + 0.085H)/Q | |
| 375. |
During purification process of sewage the gas given off, is |
| A. | arbon dioxide |
| B. | ydrogen |
| C. | mmonia |
| D. | ll the above |
| Answer» E. | |
| 376. |
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 D.O. concentration was 5 mg/l. The BOD of raw sewerage is |
| A. | 00 mg/l |
| B. | 00 mg/l |
| C. | 00 mg/l |
| D. | 00 mg/l |
| Answer» D. 00 mg/l | |
| 377. |
The minimum diameter of a sewer is kept |
| A. | 0 cm |
| B. | 5 cm |
| C. | 0 cm |
| D. | 5 cm |
| Answer» C. 0 cm | |
| 378. |
The most efficient cross-section of sewers in a combined sewerage system is |
| A. | arabolic |
| B. | ircular |
| C. | ectangular |
| D. | ew egged |
| Answer» C. ectangular | |
| 379. |
Facultative bacteria survive in |
| A. | he presence of oxygen |
| B. | he absence of oxygen |
| C. | oth cases A and B |
| D. | either A nor B |
| Answer» D. either A nor B | |
| 380. |
Dry weather flow is: |
| A. | verage daily rate of flow |
| B. | verage monthly rate of flow |
| C. | verage annual rate of flow |
| D. | ater supply allowance per capita |
| Answer» E. | |
| 381. |
Are available in size Stoneware sewers |
| A. | 0 cm |
| B. | 5 cm |
| C. | 0 cm |
| D. | ll the above |
| Answer» E. | |
| 382. |
The minimum diameter of sewer to be adopted is |
| A. | 0 cm |
| B. | 2.5 cm |
| C. | 5 cm |
| D. | 5 cm |
| Answer» D. 5 cm | |
| 383. |
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. | 0 mg/l |
| B. | 00 mg/l |
| C. | 50 mg/l |
| D. | 50 mg/l |
| Answer» E. | |
| 384. |
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. | 00 ppm |
| B. | 25 ppm |
| C. | 50 ppm |
| D. | one of these |
| Answer» D. one of these | |
| 385. |
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is |
| A. | 00 mg/l |
| B. | 00 mg/l |
| C. | 00 mg/l |
| D. | 00 mg/l |
| Answer» E. | |
| 386. |
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of |
| A. | 5 days |
| B. | 0 days |
| C. | 0 days |
| D. | 0 days |
| Answer» E. | |
| 387. |
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is |
| A. | 0 ppm |
| B. | 00 ppm |
| C. | 50 ppm |
| D. | 00 ppm |
| Answer» E. | |
| 388. |
The discharge per unit plan area of a sedimentation tank, is generally called |
| A. | ver flow rate |
| B. | urface loading |
| C. | ver flow velocity |
| D. | ll the above |
| Answer» E. | |
| 389. |
Which one of the following statements regarding septic tanks is wrong? |
| A. | gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided |
| B. | he outlet invert level is kept 5 to 7.5 cm below the inlet invert level |
| C. | he minimum width of septic level is 90 cm |
| D. | he depth of tank is kept equal to its width |
| Answer» E. | |
| 390. |
The sewage treatment in septic tanks is due to |
| A. | naerobic decomposition |
| B. | erobic decomposition |
| C. | arasitic decomposition |
| D. | one of these |
| Answer» B. erobic decomposition | |
| 391. |
Nitrogen cycle of sewage, is |
| A. | iberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen |
| B. | iberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates |
| C. | iberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia |
| D. | ormation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates |
| Answer» B. iberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates | |
| 392. |
hydraulically equivalent, the relationship which holds good, is |
| A. | 8/3 = 4 b8/3 |
| B. | 3/8 = 4 b3/8 |
| C. | 2/3 = 4 b2/3 |
| D. | 3/2 = 4 b3/2 |
| Answer» B. 3/8 = 4 b3/8 | |
| 393. |
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. | ’ = 0.64 D |
| B. | ’ = 0.74 D |
| C. | ’ = 0.84 D |
| D. | ’ = 0.94 D |
| Answer» D. ’ = 0.94 D | |
| 394. |
The quantity of liquid waste which flows in sewers during the period of rainfall, is known |
| A. | anitary sewage |
| B. | ndustrial waste |
| C. | torm sewage |
| D. | one of these |
| Answer» D. one of these | |
| 395. |
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in |
| A. | hezy’s formula |
| B. | azin’s formula |
| C. | utter’s formula |
| D. | anning’s formula |
| Answer» C. utter’s formula | |
| 396. |
Drop manholes are the manholes |
| A. | ithout entry ladders |
| B. | ithout manhole covers |
| C. | ith depths more than 3.5 m |
| D. | aving drains at different levels |
| Answer» E. | |
| 397. |
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope |
| A. | in 5 |
| B. | in 10 |
| C. | in 15 |
| D. | in 20 |
| Answer» C. in 15 | |
| 398. |
The drop man holes are generally provided in sewers for |
| A. | 3 hours. |
| B. | industrial areas |
| C. | large town ships |
| D. | hilly town ships |
| Answer» D. hilly town ships | |
| 399. |
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is |
| A. | none of these. |
| B. | 100 cm |
| C. | 110 cm |
| D. | 120 cm |
| Answer» D. 120 cm | |
| 400. |
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is |
| A. | neither (a) nor (b). |
| B. | 1.5 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1.5 | |