Hydrology Quiz | Hydrology MCQs and Answers for competitive exams

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Questions
81 Infiltration capacity of soil depends upon
A Arrangement of soil particles
B Shape and size of soil particles
C Number of voids present in the soil
D All the above

Answer: All the above
82 Which of the following spillways is least suitable for an earthen dam?
A Ogee spillway
B Chute spillway
C Side channel spillway
D Shaft spillway

Answer: Ogee spillway
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83 In India the recording type rain gauge generally used, is
A Float recording type
B Weighing type
C Tipping type
D None of these

Answer: Float recording type
84 The critical depth in a channel can be produced
A By raising the bottom of the channel
B By lowering the bottom of the channel
C By decreasing the width of the channel
D Both (a) and (c) of above

Answer: Both (a) and (c) of above
85 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: The extra turbulence generated by the excess of river sediment during floods
86 The run off a drainage basin is
A Precipitation - ground water accretion + initial recharge
B Precipitation - ground water accretion - initial recharge
C Initial recharge + ground water accretion + precipitation
D Precipitation + ground water accretion + initial recharge

Answer: Precipitation - ground water accretion - initial recharge
87 The net speed under which the turbine reaches its peak efficiency is called
A Rated speed
B Gross speed
C Design speed
D None of these

Answer: Design speed
88 Indian Meteorological department uses the standard gauges whose collectors have apertures of
A 100 or 200 sq. cm area
B 50 or 100 sq. cm area
C 100 or 150 sq. cm area
D 250 or 500 sq. cm area

Answer: 100 or 200 sq. cm area
89 The main function of a divide wall is to
A Separate the under-sluices from weir proper
B Provide smooth flow at sufficiently low velocity
C Control the silt entry in the canal
D Prevent river floods from entering the canal

Answer: Separate the under-sluices from weir proper
90 The rainfall at any place is described by
A Its frequency
B Its intensity
C Its duration
D All the above

Answer: All the above
91 Discharge curve may be extended by logarithmic method if
A Cross section of river is uniform
B River is broader and shallower
C River is of any type
D None of these

Answer: Cross section of river is uniform
92 An aggrading river is a
A Scouring river
B Both silting and scouring river
C Silting river
D Neither silting nor scouring river

Answer: Silting river
73 For the upstream face of an earthen dam, the most adverse condition for stability of slope is
A Sudden drawdown
B Steady seepage
C During construction
D Sloughing of slope

Answer: Sudden drawdown
94 Precipitation caused due to striking of air masses with a topographical feature, is called
A Orographic precipitation
B Convective precipitation
C Cyclonic precipitation
D None of those

Answer: Orographic precipitation
95 When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the permeability of the soil, is
A 0.001 cm/sec
B 0.0005 cm/sec
C 0.002 cm/sec
D 0.01 cm/sec

Answer: 0.001 cm/sec
96 The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is
A Greater than 1
B Less than 1
C Equal to 1
D None of the above

Answer: Greater than 1
97 If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is
A 245 sq. km.
B 205 sq. km.
C 225 sq. km.
D None

Answer: 245 sq. km.
98 Unit Hydrograph theory was enunciated by
A Le-Roy K. Shermen
B Merril Bernard
C W.W. Horner
D Robert E. Horten

Answer: Le-Roy K. Shermen
99 The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called
A Flexibility
B Sensitivity
C Proportionality
D None of the above

Answer: Flexibility
100 A repelling groyne is aligned
A Parallel to bank
B Pointing downstream
C Pointing upstream
D Perpendicular to bank

Answer: Pointing upstream

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