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Hydrology Quiz | Hydrology Multiple Choice Questions and Answers

Free download in PDF Hydrology Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(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
(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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