MCQOPTIONS
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MCQOPTIONS
This section includes 260 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Dry water flow in a combined sewer, is |
| A. | Industrial sewage |
| B. | Domestic sewage |
| C. | Storm water |
| D. | Inclusive of domestic and industrial sewage but excludes storm water |
| Answer» D. Inclusive of domestic and industrial sewage but excludes storm water | |
| 252. |
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. | 100 mg/l |
| B. | 200 mg/l |
| C. | 300 mg/l |
| D. | 400 mg/l |
| Answer» D. 400 mg/l | |
| 253. |
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 | |
| 254. |
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» B. Carbon dioxide | |
| 255. |
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 256. |
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. | |
| 257. |
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. | 50 ppm |
| B. | 100 ppm |
| C. | 150 ppm |
| D. | 200 ppm |
| Answer» E. | |
| 258. |
Dilution method of disposing of 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 | |
| 259. |
The temperature affects the |
| A. | Biological activity of bacteria in sewage |
| B. | Solubility of gases in sewage |
| C. | Viscosity of sewage |
| D. | All the above |
| Answer» E. | |
| 260. |
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by |
| A. | Chezy |
| B. | Manning |
| C. | Bazin |
| D. | Kutter |
| Answer» C. Bazin | |