1. How many additional rain gauges are required in a catchment, if the error allowed in estimation of mean rainfall is to be reduced by half than the present one?
[A] Equal to the present number
[B] Twice the present number
[C] Thrice the present number
[D] Four times the present number
Answer: Option C
2. The double mass curve is used to
[A] Check the consistency of rain gauge records
[B] Determine the reservoir capacity
[C] Determine the number of rain gauges required
[D] Determine the maximum probable precipitation
Answer: Option A
3. The flow-mass is graphical representation of
[A] cumulative discharge and time
[B] discharge and percentage probability of flow being equaled or exceeded
[C] cumulative discharge, volume and time in chronological order
[D] discharge and time in chronological order
Answer: Option C
4. Isohyetal method is used for determination of _____.
[A] Evapotranspiration
[B] Seepage loss
[C] Precipitation
[D] Intensity of flood
Answer: Option C
5. As per Indian Standards, in predominantly hilly areas with heavy rainfall, there should be 1 rain gauge station per ____ km².
[A] 130
[B] 30
[C] 520
[D] 330
Answer: Option A