McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 101. |
The main cause of meandering is |
| A. | presence of an excessive bed slope in the river |
| B. | degradation |
| C. | the extra turbulence generated by the excess of river sediment during floods |
| D. | none of the above |
| Answer» C. the extra turbulence generated by the excess of river sediment during floods | |
| 102. |
Tortuosity of a meandering river is always |
| A. | equal to 1 |
| B. | less than 1 |
| C. | greater than 1 |
| D. | less than or equal to 1 |
| Answer» C. greater than 1 | |
| 103. |
Select the correct statement. |
| A. | A meander increases the river length but a cut off reduces the river length. |
| B. | A cutoff increases the river length but a meander reduces the river length. |
| C. | Both meander and cutoff increase the river length. |
| D. | Both meander and cutoff decrease the river length. |
| Answer» A. A meander increases the river length but a cut off reduces the river length. | |
| 104. |
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» D. groynes and bandalling | |
| 105. |
Main purpose of mean water training for rivers is |
| A. | flood control |
| B. | to provide sufficient depth of water in navigable channels, during low water periods |
| C. | to preserve the channel in good shape by efficient disposal of suspended and bed load |
| D. | all of the above |
| Answer» C. to preserve the channel in good shape by efficient disposal of suspended and bed load | |
| 106. |
If D is the depth of scour below original bed, then the width of launching apron is generally taken as |
| A. | 1.2 D |
| B. | 1.5 D |
| C. | 2.0 D |
| D. | 2.5 D |
| Answer» B. 1.5 D | |
| 107. |
Study the following statements.
|
| A. | (i) and (ii) |
| B. | (i) and (iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» B. (i) and (iv) | |
| 108. |
A repelling groyne is aligned |
| A. | pointing upstream |
| B. | pointing downstream |
| C. | perpendicular to bank |
| D. | parallel to bank |
| Answer» A. pointing upstream | |
| 109. |
A river training work is generally required when the river is |
| A. | aggrading type |
| B. | degrading type |
| C. | meandering type |
| D. | both (a) and (b) |
| Answer» C. meandering type | |
| 110. |
A river bend characterized by silting |
| A. | scouring on concave side |
| B. | silting on convex side |
| C. | scouring on convex side and on concave side |
| D. | scouring on concave side and silting on convex side |
| Answer» D. scouring on concave side and silting on convex side | |
| 111. |
Select the incorrect statement. |
| A. | Intensive irrigation should be avoided in areas susceptible to water logging. |
| B. | Extensive irrigation should be adopted in areas susceptible to water logging. |
| C. | Lift irrigation increases water logging. |
| D. | all of the above |
| Answer» C. Lift irrigation increases water logging. | |
| 112. |
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» C. capillary fringe reaches the root zone of plants | |
| 113. |
Lining of irrigation channels |
| A. | increases the waterlogging area |
| B. | decreases the waterlogging area |
| C. | does not change the water logging area |
| D. | none of the above |
| Answer» B. decreases the waterlogging area | |
| 114. |
A runoff river plant is |
| A. | a low head scheme |
| B. | a medium head scheme |
| C. | a high head scheme |
| D. | none of the above |
| Answer» A. a low head scheme | |
| 115. |
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» A. design speed | |
| 116. |
A runoff river plant |
| A. | is a medium head scheme |
| B. | generates power during peak hours only |
| C. | is suitable only on a perennial river |
| D. | has no pondage at all |
| Answer» C. is suitable only on a perennial river | |
| 117. |
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» A. design head | |
| 118. |
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. | utilisation factor |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 119. |
A hydroelectric scheme operating under a head of 80 m will be classified as |
| A. | low head scheme |
| B. | medium head scheme |
| C. | high head scheme |
| D. | none of the above |
| Answer» C. high head scheme | |
| 120. |
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» A. rainfall intensity and time | |
| 121. |
Variability of rainfall is
|
| A. | only (i) |
| B. | (i) and (ii) |
| C. | only (iii) |
| D. | (ii) and (iii) |
| Answer» C. only (iii) | |
| 122. |
In India, which of the following is adopted as standard recording raingauge ? |
| A. | Symon's raingauge |
| B. | tipping bucket type |
| C. | natural syphon type |
| D. | weighing bucket type |
| Answer» C. natural syphon type | |
| 123. |
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. | 100 mm |
| B. | more than 100 mm |
| C. | less than 100 mm |
| D. | none of the above |
| Answer» B. more than 100 mm | |
| 124. |
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. | 1 - (0.99)10 |
| C. | (0.9)'00 |
| D. | l-(0.9)100 |
| Answer» B. 1 - (0.99)10 | |
| 125. |
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» C. cetyl alcohol | |
| 126. |
Interception losses are due to
|
| A. | only (i) |
| B. | (i)and(ii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» A. only (i) | |
| 127. |
A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If <j) index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is |
| A. | 4.5 cm |
| B. | 6.0 cm |
| C. | 7.5 cm |
| D. | 9.0 cm |
| Answer» B. 6.0 cm | |
| 128. |
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» A. slope-area method | |
| 129. |
To determine the discharge at a section in a stream from its rating curve, the required data are
|
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | only (ii) |
| D. | only (iii) |
| Answer» C. only (ii) | |
| 130. |
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» C. 2 Q m3/sec | |
| 131. |
The stream which does not have any base flow contribution is called |
| A. | perennial stream |
| B. | intermittent stream |
| C. | ephemeral stream |
| D. | none of the above |
| Answer» C. ephemeral stream | |
| 132. |
The flow-mass curve is graphical representation of |
| A. | cumulative discharge and time |
| B. | discharge and percentage probability of flow being equaled or exceeded |
| C. | cumulative discharge, volume and time in chronological order |
| D. | discharge and time in chronological order |
| Answer» C. cumulative discharge, volume and time in chronological order | |
| 133. |
If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that |
| A. | demand cannot be met by inflow |
| B. | reservoir was not full at the beginning |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» A. demand cannot be met by inflow | |
| 134. |
The shape of recession limb of a hydrograph depends upon |
| A. | basin characteristics only |
| B. | storm characteristics only |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» A. basin characteristics only | |
| 135. |
Instantaneous unit hydrograph is a hydrograph of
|
| A. | (i) and (ii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 136. |
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» A. 0.2 x 106 | |
| 137. |
A unit hydro graph has one unit of |
| A. | rainfall duration |
| B. | rainfall excess |
| C. | time base of direct runoff |
| D. | discharge |
| Answer» B. rainfall excess | |
| 138. |
The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be |
| A. | 20 3/sec |
| B. | 25 m3/sec |
| C. | 30 m3/sec |
| D. | 35 m3/sec |
| Answer» B. 25 m3/sec | |
| 139. |
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 series
|
| A. | (i) and (ii) |
| B. | (i),(ii) and (iii) |
| C. | (i), (ii) and (iv) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» B. (i),(ii) and (iii) | |
| 140. |
For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is |
| A. | N/(m+l) |
| B. | m/(N+l) |
| C. | m/N |
| D. | (N+l)/m |
| Answer» D. (N+l)/m | |
| 141. |
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» C. 1/(1-0.9°10) | |
| 142. |
The crest level in a barrage is kept at a |
| A. | low |
| B. | high |
| C. | moderate |
| Answer» A. low | |
| 143. |
When the full supply level (F.S.L.) of the canal is much below the bed level of the drainage trough, then the cross drainage provided is called syphon aqueduct. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 144. |
A spoil bank is formed when the |
| A. | canal has steel bed slope |
| B. | canal section is too large |
| C. | volume of excavation is in excess of the embankment filling |
| D. | canal alignment is meandrous |
| Answer» C. volume of excavation is in excess of the embankment filling | |
| 145. |
When the drain is over the canal, the structure provided is known as |
| A. | aqueduct |
| B. | super-passage |
| C. | canal syphon |
| D. | syphon aqueduct |
| Answer» B. super-passage | |
| 146. |
A levee on flood |
| A. | increases the water surface elevation of the river at flood |
| B. | decreases the surface slope of the stream above the leveed portion |
| C. | increases the velocity and scouring action through leveed section |
| D. | all of the above |
| Answer» D. all of the above | |
| 147. |
The primary cause of meandering is the excess of total charge during floods, when excess of turbulence is developed. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 148. |
In order to estimate the high flood discharge in fan-shaped catchment, the formula used is |
| A. | Dicken's formula |
| B. | Ryve's formula |
| C. | Inglis formula |
| D. | Fanning's formula |
| Answer» C. Inglis formula | |
| 149. |
The capacity of escape channel should not be less than |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 50% |
| Answer» D. 50% | |
| 150. |
The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called |
| A. | base period |
| B. | crop period |
| C. | kor period |
| D. | none of these |
| Answer» A. base period | |
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