Izzard formula for the time of concentration in minutes for the plots having no

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Question
Izzard formula for the time of concentration in minutes for the plots having no channels, is (where L_o is the length of overland flow in metres and Kp rainfall intensity in cm/hour)
Options
A.
B.
C.
D.

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3. The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of
Options
A. 0.1 h and 0.9 h
B. 0.2 h and 0.8 h
C. 0.3 h and 0.7 h
D. 0.4 h and 0.6 h.

5. Pick up the correct statement from the following :
Options
A. The zone below water table, is called zone of saturation
B. The zone above water table, is called zone of aeration
C. The water which exists in the zone of saturation, is called ground water
D. Water in the zone of saturation, remains under hydrostatic pressure
E. All the above.

6. Pick up the correct statement from the following :
Options
A. The intensity of rain is the rate at which it falls
B. The duration of rain is the time for which it falls with a given intensity
C. The frequency of rain is the number of times, if falls
D. All the above.

7. Non-recording rain gauges
Options
A. collect the rain whose volume is measured by means of graduated cylinders
B. collect the rain which is directly measured by means of graduated cylinders in centimetres of water depth
C. are generally used in hilly terrain
D. are cylindrical in shape.

10. Boston society of Civil Engineer's formula in cumecs/square km is based upon
Options
A. rainfall and drainage area
B. total run off and drainage area
C. drainage area and its shape
D. drainage area.

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