92. If the value of 0,nd, is 3 cm/hour, the run off will be

A. 2 cm

B. 3 cm

C. 4 cm

D. 5 cm.

93. The formula for calculating the overland flow time (To) in hours for any basin, is, where Lo is the distance of the critical point and H is the difference in elevation

A. To = 0.225 0 L 3)0.385

B. T0 =0.385( 0.665 L 3) ?

C. T0 =( 0.435 L03) 0.385

D. To =[ 0.885 Lo3 ]0.385

94. From the Survey of India map, the distance of the critical point is 20 km and difference in elevation is 193 m. The over land flow time, is

A. 2 hours

B. 3 hours

C. 2 hours and 30 minutes

D. 4 hours.

95. A unit hydrograph is a hydrograph of a rain storm of a specified duration resulting from a run-off of

A. 15 mm

B. 20 mm

C. 25 mm

D. 30 mm.

96. Pick up the correct statement from the following :

A. The specified duration of unit hydrograph, is called unit duration

B. The rain during specified duration, is called unit storm

C. A unit hydrograph for a particular unit duration may be utilised for evaluating the run off hydrographs of other storms of like durations

D. All the above.

97. If the area of storm hydrograph is equal to 102 cm, the ordinates of a unit hydrograph may be obtained by dividing the ordinates of the storm hydrograph by

A.0.5

B.1

C.2

D.4

98. Pick up the correct statement from the following :

A. The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration

B. To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor

C. The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm

D. All the above.

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