The formula for calculating the overland flow time (To) in hours for any basin,

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Question
The formula for calculating the overland flow time (T_o) in hours for any basin, is (where L_o is the distance of the critical point and H is the difference in elevation)
Options
A.
B.
C.
D.

Correct Answer

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1. The specifications of most commonly used standard gauges in India, are
Options
A. 200 sq. cm collector and 4 litres bottle
B. 100 sq. cm collector and 2 litres bottle
C. 200 sq. cm collector and 10 litres bottle
D. 100 sq. cm collector and 4 litres bottle.

2. The form factor of a drainage basin is obtained by dividing
Options
A. area of the basin by the axial length
B. average width of the basin by the axial basin
C. area of the basin by the square of the axial length
D. both (a) an (b)
E. both (b) and (c).

3. Pick up the correct statement from the following :
Options
A. The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity
B. Water retained by the interstices due to molecular attraction, is called pellicular water
C. The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'
D. Sum of the percentage of specific yield and specific retention is 100
E. All the above.

4. Pick up the correct statement from the following :
Options
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. A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
E. All the above.

6. Pick up correct statement from the following :
Options
A. The air from outer portion of cyclones gets lifted for causing precipitation
B. The air from central portion of cyclone's gets lifted for causing precipitation
C. The air from entire surface of the cyclones gets lifted for causing precipitation
D. None of those.

7. The elevation Z of the watershed is : (where letters carry their usual meanings)
Options
A. reduced level of the top most point of the basin
B. reduced level of the lower most point of the basin
C. average elevation of the highest and lowest point of the drainage basin
D. obtained by the formula

8. Pick up the correct statement from the following :
Options
A. Higher the gauge, more deficient will be the rain catch
B. Heavier the rain, lesser will be the rain catch
C. The trees serving as wind brakes in the vicinity of the gauge, should not subtend angles greater than 45�
D. Coniferrous forest is idealy suited for installing the gauge
E. All the above.

9. 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
Options
A. 0.0005 cm/sec
B. 0.001 cm/sec
C. 0.002 cm/sec
D. 0.01 cm/sec.

10. A volume of air at constant barometric pressure may be brought to dew point by
Options
A. increasing the temperature
B. decreasing the temperature
C. neither (a) nor (b)
D. both (a) and (b).

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