Hydrology and Ground Water

161. 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, peak of 4hours unit hydrograph will be

1. 20 m³/sec
2. 25 m³/sec
3. 30 m³/sec
4. 35 m³/sec

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162. The polythene bottles are used for collecting rain water and. their capacities is

1. 2 litres
2. 4 litres
3. 10 litres
4. All the above

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163. The quantity of water retained by the sub-soil against gravity, is known

1. Yield
2. Porosity
3. Specific yield
4. Specific retention

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164. The radius of influence is

1. Radius of the main well
2. Distance from the wall of main well to the point of zero draw down
3. Distance from the centre of main well to the point of zero draw down
4. None of these

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165. The rainfall at any place is described by

1. Its intensity
2. Its duration
3. Its frequency
4. All the above

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166. The rainfall cycle period in India is taken as

1. 15 years
2. 20 years
3. 25 years
4. 35 years

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167. The rate of evaporation from reservoirs may be determined by

1. Pan-measurement method
2. Empirical formulae
3. Storage equation method
4. All the above

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168. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is

1. Less than 1
2. Equal to 1
3. Greater than 1
4. Equal to zero

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169. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called

1. Proportionality
2. Flexibility
3. Setting
4. Sensitivity

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170. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to

1. Load factor
2. Plant factor
3. Utilisation factor
4. Both (A) and (B)

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