Silt excluders are constructed on the________________?

Related Mcqs:

1. As per Lacey’s theory, the silt factor is_________________?

   A. directly proportional to average par¬ticle size
   B. inversely proportional to average par¬ticle size
   C. directly proportional to square root of average particle size
   D. not related to average particle size

2. A 70% index of wetness means_______________?

   A. rain excess of 30%
   B. rain deficiency of 30%
   C. rain deficiency of 70%
   D. none of the above

3. 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

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

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

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. The shape of recession limb of a hydrograph depends upon________________?

   A. basin characteristics only
   B. storm characteristics only
   C. both (A) and (B)
   D. none of the above

7. Lining of irrigation channels________________?

   A. increases the waterlogging area
   B. decreases the waterlogging area
   C. does not change the water logging area
   D. none of the above

8. In case of non-availability of space due to topography, the most suitable spillway is________________?

   A. straight drop spillway
   B. shaft spillway
   C. chute spillway
   D. ogee spillway

9. A deep well_________________?

   A. is always deeper than a shallow well
   B. has more discharge than a shallow well
   C. is weaker structurally than a shallow well
   D. both (A) and (B)

10. Rate of evaporation from a water surface increases if_________________?

    1) difference of vapour pressure between water and air is increased
    2) velocity of wind is decreased
    3) concentration of soluble solids in water is decreased
    The correct answer is?

    A. (1) and (i2)
    B. (2) and (3)
    C. (2) and (3)
    D. (1), (2) and (3)