Civil Engineering MCQs

Page No. 149

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__________________?


a20 3/sec


b25 m3/sec


c30 m3/sec


d35 m3/sec


View Answer 25 m3/sec

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


b0.6 x 106


c2.4 xlO6


d7.2 xlO6


View Answer 0.2 x 106

disThe shape of recession limb of a hydrograph depends upon________________?


abasin characteristics only


b storm characteristics only


cboth (A) and (B)


dnone of the above



The flow-mass curve is graphical representation of__________________?


acumulative discharge and time


bdischarge and percentage probability of flow being equaled or exceeded


ccumulative discharge, volume and time in chronological order


ddischarge and time in chronological order



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) will be________________?


aV2 Q m3/sec


b 0.5 Q mVsec


c 2 Q m3/sec


d 4 Q m3/sec


View Answer 2 Q m3/sec

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___________________?


a4.5 cm


b 6.0 cm


c7.5 cm


d9.0 cm


View Answer 6.0 cm

The most suitable chemical which can be applied to the water surface for reducing evaporation is________________?


amethyl alcohol


b ethyl alcohol


ccetyl alcohol


dbutyl alcohol


View Answer cetyl alcohol

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__________________?


a100 mm


bmore than 100 mm


cless than 100 mm


dnone of the above


View Answer more than 100 mm

A hyetograph is a graphical representation of___________________?


arainfall intensity and time


brainfall depth and time


cdischarge and time


d cumulative rainfall and time



A runoff river plant_________________?


ais a medium head scheme


b generates power during peak hours only


c is suitable only on a perennial river


dhas no pondage at all



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