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.
| 51. |
Generally the weir is aligned at right angles to the direction of the main river currentbecause |
| A. | it ensures less length of the weir |
| B. | it gives better discharging capacity |
| C. | it is economical |
| D. | all of the above |
| Answer» E. | |
| 52. |
To estimate the magnitude of a flood with a return period of T years, Gumbel's distribution method requires the following data pertaining to annual flood seriesi) mean valueii) standard deviationiii) length of recordiv) coefficient of skewThe correct answer is |
| A. | (i) and (ii) |
| B. | (i),(ii) and (iii) |
| C. | (i), (ii) and (iv) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» C. (i), (ii) and (iv) | |
| 53. |
The ratio of the quantity of water stored in the root zone of the crops to the quantity of wateractually 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 | |
| 54. |
The flow of water after spilling over the weir crest in chute spillway and side channelspillway respectively are |
| A. | at right angle and parallel to weir crest |
| B. | parallel and at right angle to weir crest |
| C. | parallel to weir crest in both |
| D. | at right angle to weir crest in both |
| Answer» B. parallel and at right angle to weir crest | |
| 55. |
Under the same conditions, which of the following shapes of water surface will give thehighest rate of evaporation ? |
| A. | flat water surface |
| B. | convex water surface |
| C. | concave water surface |
| D. | independent of shape of water surface |
| Answer» C. concave water surface | |
| 56. |
Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milliequivalent per litre respectively will be classified as |
| A. | low sodium water |
| B. | medium sodium water |
| C. | high sodium water |
| D. | very high sodium water |
| Answer» C. high sodium water | |
| 57. |
The most suitable material for the central impervious core of a zoned embankment typedam is |
| A. | clay |
| B. | coarse sand |
| C. | silty clay |
| D. | clay mixed with fine sand |
| Answer» E. | |
| 58. |
In a Sarda type fall, rectangular crest is used for discharge upto |
| A. | 6 cumecs |
| B. | 10 cumecs |
| C. | 14 cumecs |
| D. | 20 cumecs |
| Answer» D. 20 cumecs | |
| 59. |
The unit hydrograph of a specified duration can be used to evaluate the hydrograph ofstorms of |
| A. | same duration only |
| B. | same and shorter duration |
| C. | same and longer duration |
| D. | any duration |
| Answer» E. | |
| 60. |
If d is the depth of the aquifer through which water is flowing, then the relationshipbetween permeability k and transmissible T is given by |
| A. | T = kd |
| B. | T = k/d |
| C. | T= Vkd |
| D. | k= VTd |
| Answer» B. T = k/d | |
| 61. |
The depth of water required to bring the soil moisture content of a given soil upto its fieldcapacity is called |
| A. | hygroscopic water |
| B. | equivalent moisture |
| C. | soil moisture deficiency |
| D. | pellicular water |
| Answer» D. pellicular water | |
| 62. |
For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for acapacity 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 | |
| 63. |
Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey's theory will be |
| A. | 19 m |
| B. | 38m |
| C. | 57m |
| D. | 76m |
| Answer» C. 57m | |
| 64. |
The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65cm 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 | |
| 65. |
If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltrationrate will be |
| A. | equal to rate of rainfall |
| B. | equal to infiltration capacity |
| C. | more than rate of rainfall |
| D. | more than infiltration capacity |
| Answer» C. more than rate of rainfall | |
| 66. |
When the upstream face of a gravity dam is vertical, then the intensity of water pressure atthe water surface and at the base respectively will be (where w is unit weight of water and H is the depth of water.) |
| A. | 0 and wH212 |
| B. | wH2/2and wH2/3 |
| C. | wH and 0 |
| D. | OandwII |
| Answer» E. | |
| 67. |
The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000)willbe |
| A. | V2 Q m3/sec |
| B. | 0.5 Q mVsec |
| C. | 2 Q m3/sec |
| D. | 4 Q m3/sec |
| Answer» D. 4 Q m3/sec | |
| 68. |
As per Lacey's theory, the silt factor is |
| A. | directly proportional to average par¬ticle size |
| B. | inversely proportional to average par¬ticle size |
| C. | directly proportional to square root of average particle size |
| D. | not related to average particle size |
| Answer» D. not related to average particle size | |
| 69. |
The most suitable chemical which can be applied to the water surface for reducingevaporation is |
| A. | methyl alcohol |
| B. | ethyl alcohol |
| C. | cetyl alcohol |
| D. | butyl alcohol |
| Answer» D. butyl alcohol | |
| 70. |
Rate of evaporation from a water surface increases ifi) difference of vapour pressure between water and air is increasedii) velocity of wind is decreasediii) concentration of soluble solids in water is decreased The correct answer is |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i). (ii) and (iii) |
| Answer» C. (ii) and (iii) | |
| 71. |
The ratio of average values of shear stresses produced on the bed and the banks of a channeldue to flowing water is |
| A. | less than 1 |
| B. | equal to 1 |
| C. | greater than 1 |
| D. | equal to zero |
| Answer» D. equal to zero | |
| 72. |
Which of the following types of rain gauges is used for measuring rain in remote hillyinaccessible areas ? |
| A. | tipping bucket type |
| B. | weighing type |
| C. | floating type |
| D. | Simon's raingauge |
| Answer» B. weighing type | |
| 73. |
If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing waterat 3 P.M. to the outlet, then time of concentration will be |
| A. | 15 minutes |
| B. | 20 minutes |
| C. | 30 minutes |
| D. | 60 minutes |
| Answer» E. | |
| 74. |
The minimum size of stone that will remain at rest in a channel of longitudinal slope S andhydraulic mean depth R is given by |
| A. | 4RS |
| B. | 11 RS |
| C. | 7RS |
| D. | 15 RS |
| Answer» C. 7RS | |
| 75. |
The ratio of rate of change of the discharge of an outlet to the rate of change of thedischarge of distributing channel is called |
| A. | proportionality |
| B. | flexibility |
| C. | setting |
| D. | sensitivity |
| Answer» C. setting | |
| 76. |
As compared to crest of the normal portion of the weir, the crest of the under sluice portionof weir is kept at |
| A. | lower level |
| B. | higher level |
| C. | same level |
| D. | any of the above depending on the design |
| Answer» B. higher level | |
| 77. |
If D is the depth of scour below original bed, then the width of launching apron isgenerally taken as |
| A. | 1.2 D |
| B. | 1.5 D |
| C. | 2.0 D |
| D. | 2.5 D |
| Answer» C. 2.0 D | |
| 78. |
The net head under which the turbine reaches its peak efficiency at synchronous speed iscalled |
| A. | design head |
| B. | rated head |
| C. | gross head |
| D. | operating head |
| Answer» B. rated head | |
| 79. |
Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas.Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below : |
| A. | oth A and R are true and R is the correct explanation of A |
| B. | oth A and R are true but R is not the correct explanation of A |
| C. | is true but R is false |
| D. | is false but R is true |
| Answer» B. oth A and R are true but R is not the correct explanation of A | |
| 80. |
The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be |
| A. | 0mm |
| B. | 0mm |
| C. | 0 mm |
| D. | 05 mm |
| Answer» B. 0mm | |
| 81. |
The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after |
| A. | 0 years |
| B. | 50 years |
| C. | 00 years |
| D. | 50 years |
| Answer» B. 50 years | |
| 82. |
The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by |
| A. | 0.99)10 |
| B. | – (0.99)10 |
| C. | 0.9)00 |
| D. | -(0.9)100 |
| Answer» C. 0.9)00 | |
| 83. |
The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD) curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be |
| A. | 00 mm |
| B. | ore than 100 mm |
| C. | ess than 100 mm |
| D. | one of the above |
| Answer» C. ess than 100 mm | |
| 84. |
If B and d are the bed width and depth of a channel in meters, the combined losses due to evaporation and seepage in cumecs per kilometer length of the channel, is |
| A. | 1/50) × (B + d)2/3 |
| B. | 1/100) × (B + d)2/3 |
| C. | 1/150) × (B + d)2/3 |
| D. | 1/200) × (B + d)2/3 |
| Answer» E. | |
| 85. |
If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be |
| A. | 5 minutes |
| B. | 0 minutes |
| C. | 0 minutes |
| D. | 0 minutes |
| Answer» E. | |
| 86. |
Presence of tail water in a gravity dami) increases the principal stressii) decreases the principal stressiii) increases the shear stressiv) decreases the shear stressThe correct answer is |
| A. | i) and (iii) |
| B. | i)and(iv) |
| C. | ii) and (iii) |
| D. | ii) and (iv) |
| Answer» E. | |
| 87. |
The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be |
| A. | 0 mm |
| B. | 0 mm |
| C. | 0 mm |
| D. | 40 mm |
| Answer» D. 40 mm | |
| 88. |
The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, arei) Water pressureii) Self weightiii) Upliftiv) Pressure due to earthquakeThe correct answer is |
| A. | nly (ii) |
| B. | i), (ii) and (iii) |
| C. | i), (ii) and (iv) |
| D. | i), (ii), (iii) and (iv) |
| Answer» B. i), (ii) and (iii) | |
| 89. |
A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ϕ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is |
| A. | .5 cm |
| B. | .0 cm |
| C. | .5 cm |
| D. | .0 cm |
| Answer» C. .5 cm | |
| 90. |
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is |
| A. | = 1.71 BD1/2 |
| B. | = 1.71 BD |
| C. | = 1.71 BD3/2 |
| D. | = 1/71 BD2/3 |
| Answer» D. = 1/71 BD2/3 | |
| 91. |
The length and width of a meander and also the width of the river, vary roughly as |
| A. | Square root of the discharge |
| B. | Discharge |
| C. | Square of the discharge |
| D. | Cube of the discharge |
| Answer» B. Discharge | |
| 92. |
The water face of the guide banks, is protected by |
| A. | One men stone pitching |
| B. | Two man stone pitching |
| C. | Three man stone pitching |
| D. | Four man stone pitching |
| Answer» B. Two man stone pitching | |
| 93. |
The uplift pressure on the roof of an inverted syphon, is maximum when |
| A. | Drain in running dry |
| B. | Canal is running dry |
| C. | Canal is running with F.S.L. |
| D. | Drain is running with H.F.L. |
| Answer» E. | |
| 94. |
The useful moisture of soil, is equal to its |
| A. | Field capacity |
| B. | Saturation capacity |
| C. | Moisture content at permanent wilting point |
| D. | Difference between filed capacity and permanent wilting point within the root zone of plants |
| Answer» E. | |
| 95. |
The consumptive use of water for a crop |
| A. | Is measured as the volume of water per unit area |
| B. | Is measured as depth of water on irrigated area |
| C. | May be supplied partly by precipitation and partly by irrigation |
| D. | All the above |
| Answer» E. | |
| 96. |
A divide wall is provided |
| A. | At right angle to the axis of weir |
| B. | Parallel to the axis of weir and upstream of it |
| C. | Parallel to the axis of weir and downstream of it |
| D. | At an inclination to the axis of weir |
| Answer» B. Parallel to the axis of weir and upstream of it | |
| 97. |
A multipurpose reservoir is the one which is |
| A. | designed for one purpose but serves more than one purpose |
| B. | planned and constructed to serve various purposes |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 98. |
A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If<="" div=""> |
| A. | 4.5 cm |
| B. | 6.0 cm |
| C. | 7.5 cm |
| D. | 9.0 cm |
| Answer» C. 7.5 cm | |
| 99. |
The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of |
| A. | Reverse curve |
| B. | Next curve of the same order |
| C. | Reverse curve plus the width of the river |
| D. | None of these |
| Answer» C. Reverse curve plus the width of the river | |
| 100. |
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is |
| A. | 2V²/√3 R |
| B. | 3V²/4R |
| C. | 5V²/2R |
| D. | 2V²/5R |
| Answer» D. 2V²/5R | |