For the upstream face of an earthen dam, the most adverse condition for stability of slope is_______________?

Related Mcqs:

1. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?

   A. 0 and wH212
   B. wH2/2and wH2/3
   C. wH and 0
   D. OandwII

   where w is unit weight of water and H is the depth of water

2. Seepage through foundation in an earthen dam is controlled by providing___________________?

   A. rock toe
   B. horizontal blanket
   C. impervious cut off
   D. chimney drain

3. Which of the following spillways is least suitable for an earthen dam ?

   A. ogee spillway
   B. chute spillway
   C. side channel spillway
   D. shaft spillway

4. Seepage through embankments in an earthen dam is controlled by_______________?

   A. drainage filters
   B. relief wells
   C. drain trenches
   D. provision of downstream berms

5. As compared to gravity dams, earthen dams__________________?

   A. are costlier
   B. are less susceptible to failure
   C. require sound rock foundations
   D. require less skilled labour

6. The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000) will be________________?

   A. V2 Q m3/sec
   B. 0.5 Q mVsec
   C. 2 Q m3/sec
   D. 4 Q m3/sec

7. The uplift pressure on the face of a drainage gallery in a dam is taken as_________________?

   A. hydrostatic pressure at toe
   B. average of hydrostatic pressure at toe and heel
   C. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
   D. none of the above

8. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?

   1) Water pressure
   2) Self weight
   3) Uplift
   4) Pressure due to earthquake
   The correct answer is

   A. Only (2)
   B. (1), (2) and (3)
   C. (1), (2) and (4)
   D. (1), (2), (3) and (4)

9. The most suitable material for the central impervious core of a zoned embankment type dam is_______________?

   A. clay
   B. coarse sand
   C. silty clay
   D. clay mixed with fine sand

10. The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by______________?

    A. 4RS
    B. 11 RS
    C. 7RS
    D. 15 RS