Hydrology and Water Resources Engineering Objective Test - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. When the reservoir is full, the maximum compressive force in a gravity dam is produced
(A) At the toe
(B) At the heel
(C) Within the middle third of base
(D) At centre of base

2. Pick up the correct statement from the following:
(A) Yield of a drainage basin is the run off at any time
(B) Yield of a drainage basin is the run off over long periods
(C) Yield of a drainage basin is expressed as surface run off per year
(D) Run off is expressed as total volume per day

3. For the upstream face of an earthen dam, the most adverse condition for stability of slope is
(A) Sudden drawdown
(C) During construction
(D) Sloughing of slope

4. Pick up the correct statement from the following:
(A) If ground water enters the channel, the channel is known as effluent channel
(B) If water goes out of channel to meet ground water, the channel is said to be influent stream
(C) If the water table is at higher level than the water level in channel, ground water flows to the stream
(D) All the above

5. Vertical drop fall is satisfactory for a height upto
(A) 0.5 m
(B) 1.5 m
(C) 3.5 m
(D) 5.0 m

6. Precipitation caused due to striking of air masses with a topographical feature, is called
(A) Orographic precipitation
(B) Convective precipitation
(C) Cyclonic precipitation
(D) None of these

7. If D is the depth of scour below original bed, then the width of launching apron is generally taken as
(A) 1.2 D
(B) 1.5 D
(C) 2.0 D
(D) 2.5 D

8. For efficient working of a control meter, its throat length is approximately kept
(A) Equal to the critical depth
(B) Twice the critical depth
(C) Three times the critical depth
(D) Four times the critical depth

9. The net head under which the turbine reaches its peak efficiency at synchronous speed is called

10. 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

11. A unit hydro graph has one unit of
(A) Rainfall duration
(B) Rainfall excess
(C) Time base of direct runoff
(D) Discharge

12. 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
(A) 0.0005 cm/sec
(B) 0.001 cm/sec
(C) 0.002 cm/sec
(D) 0.01 cm/sec

13. The maximum permissible eccentricity for no tension at the base of a gravity dam is
(A) B/2
(B) B/3
(C) B/4
(D) B/6

14. Levees and flood walls,
(A) Are designed to carry unbalanced water load
(B) Are designed with adequate dimensions
(C) Are means of controlling floods
(D) Are never provided free-boards

15. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is
(A) Less than 1
(B) Equal to 1
(C) Greater than 1
(D) Equal to zero

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