Hydrology Quiz | Hydrology Multiple Choice Questions and Answers

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Questions
1 Generally the weir is aligned at right angles to the direction of the main river current because
A It is economical
B It gives better discharging capacity
C It ensures less length of the weir
D All of the above

Answer: All of the above
2 The meander pattern of a river is developed by
A Dominant discharge
B Maximum discharge
C Critical discharge
D None of the above

Answer: Dominant discharge
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3 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: Basin characteristics only
4 The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are
A At right angle to weir crest in both
B Parallel to weir crest in both
C At right angle and parallel to weir crest
D Parallel and at right angle to weir crest

Answer: At right angle and parallel to weir crest
5 Select the correct statement.
A A meander increases the river length but a cut off reduces the river length
B A cut-off increases the river length but a meander reduces the river length
C Both meander and cut-off increase the river length
D Both meander and cut-off decrease the river length

Answer: A meander increases the river length but a cut off reduces the river length
6 The flow-mass curve is graphical representation of
A Cumulative discharge, volume and time in chronological order
B Discharge and time in chronological order
C Cumulative discharge and time
D Discharge and percentage probability of flow being equalled or exceeded

Answer: Cumulative discharge, volume and time in chronological order
7 A divide wall is provided
A Parallel to the axis of weir and downstream of it
B Parallel to the axis of weir and upstream of it
C At right angle to the axis of weir
D At an inclination to the axis of weir

Answer: At right angle to the axis of weir
8 The time required by rain water to reach the outlet of drainage basin, is generally called
A Time of overland flow
B Time of concentration
C Concentration time of overland flow
D Duration of the rainfall

Answer: Time of concentration
9 Pick up the correct statement from the following:
A The number of unit hydrographs for a given basin, is theoretically infinite
B The specified duration of unit hydrograph, is called unit duration
C The rain during specified duration, is called unit storm
D All the above

Answer: All the above
10 The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in
A Super passage and canal syphon
B Aqueduct and super passage
C Aqueduct and syphon aqueduct
D Level crossing

Answer: Super passage and canal syphon
11 A land is known as waterlogged
A Capillary fringe reaches the root zone of plants
B When gravity drainage has ceased
C When the permanent wilting point is reached
D None of the above

Answer: Capillary fringe reaches the root zone of plants
12 Pick up the correct statement from the following:
A The maximum flow in the river due to rainfall, is called peak flow
B Hydrograph is a plot of discharge and time
C In hydrographs, time is plotted on X-axis
D All the above

Answer: All the above
13 For efficient working of a control meter, its throat length is approximately kept
A Three times the critical depth
B Twice the critical depth
C Equal to the critical depth
D Four times the critical depth

Answer: Three times the critical depth
14 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: Design head
15 A unit hydro graph has one unit of
A Rainfall excess
B Time base of direct runoff
C Rainfall duration
D Discharge

Answer: Rainfall excess
16 Levees and flood walls,
A Are designed to carry unbalanced water load
B Are designed with adequate dimensions
C Are means of controlling floods
D Are never provided free-boards

Answer: Are never provided free-boards
17 Pick up the correct equation from the following:
A Run off = Surface run off + Ground water flow
B Run off = Surface run off - Ground water flow
C Run off = Surface run off / Ground water flow
D Run off = Surface run off x Ground water flow

Answer: Run off = Surface run off + Ground water flow
18 Precipitation caused by lifting of an air mass due to the pressure difference, is called
A Cyclonic precipitation
B Convective precipitation
C Orographic precipitation
D None of these

Answer: Cyclonic precipitation
19 The deficiency in rain catch due to vertical acceleration of air forced upward over the gauge, is
A Lesser for small rain drops
B Greater for large drops
C Greater for lighter rain
D Greater for heavy rain

Answer: Greater for lighter rain
20 As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at
A Lower level
B Higher level
C Same level
D Any of the above depending on the design

Answer: Lower level

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