MCQOPTIONS
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MCQOPTIONS
This section includes 515 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Horizontal acceleration due to earthquake results in? |
| A. | hydrodynamic pressure |
| B. | inertia force into the body of the dam |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» D. none of the above | |
| 452. |
The top of the capillary zone? |
| A. | Lies below the water table at every point |
| B. | Lies above the water table at every point |
| C. | Coincides the water table at every point |
| D. | None of these |
| Answer» C. Coincides the water table at every point | |
| 453. |
The main cause of silting up a channel,? |
| A. | Non-regime section |
| B. | Inadequate slope |
| C. | Defective head regulator |
| D. | All the above |
| Answer» E. | |
| 454. |
When a canal is carried over a natural drainage, the structure provided, is known as? |
| A. | Syphon |
| B. | Aqueduct |
| C. | Super passage |
| D. | Syphon-aqueduct |
| Answer» C. Super passage | |
| 455. |
For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is? |
| A. | 0.2 x 106 |
| B. | 0.6 x 106 |
| C. | 2.4 xlO6 |
| D. | 7.2 xlO6 |
| Answer» B. 0.6 x 106 | |
| 456. |
If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be |
| A. | 1 + (0.9)010 |
| B. | 1 – (0.9)°l0 |
| C. | 1/(1-0.9°10) |
| D. | 1/(1+ 0.9010) |
| Answer» D. 1/(1+ 0.9010) | |
| 457. |
Unit of runoff in M.K.S. system is |
| A. | cubic metre/sec |
| B. | metre/sec |
| C. | cubic metre |
| D. | square metre |
| Answer» B. metre/sec | |
| 458. |
Seepage through embankments in an earthen dam is controlled by |
| A. | drainage filters |
| B. | relief wells |
| C. | drain trenches |
| D. | provision of downstream berms |
| Answer» D. provision of downstream berms | |
| 459. |
Which of the following canal outlets maintains a constant discharge ? |
| A. | non-modular outlet |
| B. | flexible outlet |
| C. | rigid module |
| D. | none of the above |
| Answer» D. none of the above | |
| 460. |
If average particle size of the silt in millimeters is m, the Lacey's silt factor f is proportional to |
| A. | m3 |
| B. | m1/2 |
| C. | m1/3 |
| D. | m2/3 |
| Answer» C. m1/3 | |
| 461. |
The maximum permissible eccentricity for no tension at the base of a gravity dam is |
| A. | B/2 |
| B. | B/3 |
| C. | B/4 |
| D. | B/6 |
| Answer» E. | |
| 462. |
If A is the area of the surface, x̅ is the depth of its C.G. from the surface of the water and ω is the density of water, then$ |
| A. | Total pressure on the surface is equal to ωx̅ |
| B. | Depth of the point at which total pressure acts is equal to its moment of inertia divided by AxÃÖ |
| C. | Depth of the centre of pressure is 2/3H vertically below the surface |
| D. | All the above |
| Answer» E. | |
| 463. |
When the reservoir is full, the maximum compressive force in a gravity dam is produced |
| A. | at the toe |
| B. | at the heel |
| C. | within the middle third of base |
| D. | at centre of base |
| Answer» B. at the heel | |
| 464. |
The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in |
| A. | aqueduct and syphon aqueduct |
| B. | aqueduct and super passage |
| C. | super passage and canal syphon |
| D. | level crossing |
| Answer» D. level crossing | |
| 465. |
The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by |
| A. | direct runoff volume |
| B. | period of storm |
| C. | total rainfall |
| D. | none of the above |
| Answer» B. period of storm | |
| 466. |
Lacy's regime condition is obtained if |
| A. | Silt grade in the channel is variable |
| B. | Discharge in the channel is variable |
| C. | Silt charge in the channel is variable |
| D. | Channel flows in unlimited, incoherent alluvium of the same character as that transported material |
| Answer» E. | |
| 467. |
Which of the following is a non-recording raingauge ? |
| A. | tipping bucket type raingauge |
| B. | Simon’s raingauge |
| C. | Steven’s weighing type raingauge |
| D. | floating type raingauge |
| Answer» C. Steven‚Äö√Ñ√¥s weighing type raingauge | |
| 468. |
When surface of transpiration is submerged under water, then potential evapotranspiration is |
| A. | much more than evapotranspiration |
| B. | much less than evapotranspiration |
| C. | equal to evapotranspiration |
| D. | equal to or less than evapotranspi-ration |
| Answer» B. much less than evapotranspiration | |
| 469. |
Hydrograph is the graphical representation of |
| A. | runoff and time |
| B. | surface runoff and time |
| C. | ground waterflow and time |
| D. | rainfall and time |
| Answer» B. surface runoff and time | |
| 470. |
If the R.L’s of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be$ |
| A. | aqueduct |
| B. | superpassage |
| C. | syphon |
| D. | syphon aqueduct |
| Answer» D. syphon aqueduct | |
| 471. |
The most suitable chemical which can be applied to the water surface for reducing evaporation is |
| A. | Methyl alcohol |
| B. | Ethyl alcohol |
| C. | Cetyl alcohol |
| D. | Butyl alcohol |
| Answer» D. Butyl alcohol | |
| 472. |
The sensitivity of a rigid module is |
| A. | zero |
| B. | between zero and one |
| C. | 1 |
| D. | infinity |
| Answer» B. between zero and one | |
| 473. |
The value of Sodium Absorption Ratio for high sodium water lies between |
| A. | 0 to 10 |
| B. | 10 to 18 |
| C. | 18 to 26 |
| D. | 26 to 34 |
| Answer» D. 26 to 34 | |
| 474. |
Lacey's equation for calculating flood discharge in rivers, is |
| A. | V = 10.8 R1/2 S1/2 |
| B. | V = 10.8 R2/3 S1/2 |
| C. | V = 10.8 R2/3 S1/3 |
| D. | V = 10.8 R1/3 S2/3 |
| Answer» D. V = 10.8 R1/3 S2/3 | |
| 475. |
The water stored in the reservoir below the minimum pool level is called |
| A. | useful storage |
| B. | dead storage |
| C. | valley storage |
| D. | surcharge storage |
| Answer» C. valley storage | |
| 476. |
Variability of rainfall isi) largest in regions of high rainfallii) largest in coastal areasiii) largest in regions of scanty rainfallThe correct answer is |
| A. | only (i) |
| B. | (i) and (ii) |
| C. | only (iii) |
| D. | (ii) and (iii) |
| Answer» D. (ii) and (iii) | |
| 477. |
The discharge passing over an ogee spillway is given by (where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.) |
| A. | CLH3/2 |
| B. | CHL3/2 |
| C. | CLH5/2 |
| D. | CLH1/2 |
| Answer» B. CHL3/2 | |
| 478. |
The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as |
| A. | water conveyance efficiency |
| B. | water application efficiency |
| C. | water use efficiency |
| D. | none of the above |
| Answer» C. water use efficiency | |
| 479. |
For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of |
| A. | rabi or kharif |
| B. | rabi and kharif or sugarcane |
| C. | rabi and sugarcane or kharif and sugarcane |
| D. | rabi or kharif or sugarcane |
| Answer» D. rabi or kharif or sugarcane | |
| 480. |
With the increase in the quantity of water supplied, the yield of most crops |
| A. | increases continuously |
| B. | decreases continuously |
| C. | increases upto a certain limit and then becomes constant |
| D. | increases upto a certain limit and then decreases |
| Answer» E. | |
| 481. |
Instantaneous unit hydrograph is a hydrograph ofi) unit durationii) unit rainfall excessiii) infinitely small durationiv) infinitely small rainfall excessThe correct answer is |
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» D. (iii) and (iv) | |
| 482. |
If there are two canals taking off from each flank of a river, then there will be |
| A. | one divide wall and one undersluice |
| B. | one divide wall and two undersluices |
| C. | two divide walls and one undersluice |
| D. | two divide walls and two undersluices |
| Answer» E. | |
| 483. |
A unit hydro graph has one unit of |
| A. | rainfall duration |
| B. | rainfall excess |
| C. | time base of direct runoff |
| D. | discharge |
| Answer» C. time base of direct runoff | |
| 484. |
The net speed under which the turbine reaches its peak efficiency is called |
| A. | design speed |
| B. | rated speed |
| C. | gross speed |
| D. | operating speed |
| Answer» B. rated speed | |
| 485. |
The uplift pressure on a dam can be controlled byi) constructing cutoff under upstream faceii) constructing drainage channels bet-ween the dam and its foundationiii) by pressure grouting in foundationThe corret answer is |
| A. | only (i) |
| B. | both (i) and (ii) |
| C. | both (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 486. |
A 70% index of wetness means |
| A. | rain excess of 30% |
| B. | rain deficiency of 30% |
| C. | rain deficiency of 70% |
| D. | none of the above |
| Answer» C. rain deficiency of 70% | |
| 487. |
The scour depth D of a river during flood, may be calculated from the Lacey's equation |
| A. | D = 0.47 (Q/f) |
| B. | D = 0.47 (Q/f)1/2 |
| C. | D = 0.47 (Q/f)1/3 |
| D. | D = 0.47 (Q/f)2/3 |
| Answer» D. D = 0.47 (Q/f)2/3 | |
| 488. |
Trap efficiency of a reservoir is a function of |
| A. | capacity/inflow ratio |
| B. | capacity/outflow ratio |
| C. | outflow/inflow ratio |
| D. | none of the above |
| Answer» B. capacity/outflow ratio | |
| 489. |
The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be |
| A. | 637 hectares/m3/sec |
| B. | 837 hectares/m3/sec |
| C. | 972 hectares/m3/sec |
| D. | 1172 hectares/m3/sec |
| Answer» B. 837 hectares/m3/sec | |
| 490. |
The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to |
| A. | Load factor |
| B. | Plant factor |
| C. | Utilization factor |
| D. | Both (A) and (B) |
| Answer» E. | |
| 491. |
The net head under which the turbine reaches its peak efficiency at synchronous speed is called |
| A. | design head |
| B. | rated head |
| C. | gross head |
| D. | operating head |
| Answer» B. rated head | |
| 492. |
The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be |
| A. | 50 cm |
| B. | 55 cm |
| C. | 56 cm |
| D. | 60 cm |
| Answer» D. 60 cm | |
| 493. |
Hydrodynamic pressure due to earthquake acts at a height of |
| A. | 3H/4π above the base |
| B. | 3H/4π below the water surface |
| C. | 4H/3π above the base |
| D. | 4H/3π below the water surface, where H is the depth of water |
| Answer» D. 4H/3≈ì√Ñ below the water surface, where H is the depth of water | |
| 494. |
The "outlet discharge factor" is the duty at the head of |
| A. | main canal |
| B. | branch canal |
| C. | watercourse |
| D. | distributory |
| Answer» D. distributory | |
| 495. |
River training for depth is achieved by |
| A. | groynes |
| B. | construction of dykes or leavees |
| C. | both (A) and (B) |
| D. | groynes and bandalling |
| Answer» E. | |
| 496. |
A land is known as waterlogged |
| A. | when the permanent wilting point is reached |
| B. | when gravity drainage has ceased |
| C. | capillary fringe reaches the root zone of plants |
| D. | none of the above |
| Answer» D. none of the above | |
| 497. |
Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ? |
| A. | slope-area method |
| B. | area-velocity method |
| C. | moving boat method |
| D. | ultra-sonic method |
| Answer» B. area-velocity method | |
| 498. |
The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of |
| A. | same duration only |
| B. | same and shorter duration |
| C. | same and longer duration |
| D. | any duration |
| Answer» E. | |
| 499. |
The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by |
| A. | 4RS |
| B. | 11RS |
| C. | 7RS |
| D. | 15 RS |
| Answer» C. 7RS | |
| 500. |
A hyetograph is a graphical representation of |
| A. | rainfall intensity and time |
| B. | rainfall depth and time |
| C. | discharge and time |
| D. | cumulative rainfall and time |
| Answer» B. rainfall depth and time | |