1. 
The ordinate of the IUH (Instantaneous Unit Hydrograph) of a catchment at any time t, is


Answer:
Option (c) 
2. 
A peak of a flood hydrograph due to a 6 hour storm is 470 m3/sec. The average depth of rainfall is 8.0 cms. Assume an infiltration loss of 0.25cm/hour and a constant base flow of 15 m3/sec. The peak discharge of 6 hour unit hydrograph for this catchment will be


Answer:
Option (a) 
3. 
A basin has an area of 26560 km2, perimeter 965 km and length of thalweg 230 km. The compactness coefficient of the basin is __________.


Answer:
Option (a) 
4. 
Fern leaf catchments, when compared with fan shaped catchments, will have


Answer:
Option (a) 
5. 
A catchment area is in the form of a sector of a circle of radius 3 km and angle 30°. Its hydrograph can be approximated to a triangle having time base = 12 hr. The effective rainfall during the storm of 6hr duration is 3 cm. The peak of this hydrograph will be ____________ m3/s.


Answer:
Option (a) 
6. 
During a 3 hour storm event, it was observed that all abstractions other than infiltration are negligible. The rainfall was idealized as three one hour storms of intensity 10 mm/hr, 20 mm/hr and 10 mm/hr respectively and the infiltration was idealized as Horton's curve, φ = 6.8 + 8.7 e–t. [φ in mm/hr and t in hr] The effecitve rainfall is ______________ mm.


Answer:
Option (b) 
7. 
For a catchment, the Scurve (or Shydrograph) due to a rainfall of intensity 1 cm/hr is given by Q = 1 – (1 + t ) e–t (t in hr and Q in m3/s). The ordinate of a 2hour unit hydrograph for this catchment at t = 3 hour, will be ___________ m3/s.


Answer:
Option (b) 
8. 
The peak flow of a flood hydrograph caused by isolated storm was observed to be 120 m3/s. The storm was of 6 hours duration and had a total rainfall of 7.5 cm. If the base flow and φindex are assumed to be 30 m3/s and 0.25 cm/h respectively, the peak ordinate of the 6h unit hydrograph (in m3/s) of the catchment is


Answer:
Option (b) 
9. 
The 6h unit hydrograph of a catchment is triangular in shape with a base width of 64 hours and peak ordinate of 20 m3/s. If a 0.5 cm rainfall excess occurs in 6 hours in that catchment, the resulting surface runoff hydrograph will have a peak of ____________ m3/s.


Answer:
Option (a) 
10. 
The equilibrium discharge (in cumecs) of the Scurve derived from a 4h unit hydrograph for this catchment, having an area of 360 km2, is __________ m3/s.


Answer:
Option (a) 