Irrigation problems
- 1. A land is said to be water-logged if its soil pores within
Options- A. a depth of 40 cm are saturated
- B. a depth of 50 cm are saturated
- C. root zone of the crops are saturated
- D. all the above. Discuss
Correct Answer: root zone of the crops are saturated
- 2. In rigid module, the discharge
Options- A. is independent of water levels in the distributary and water course
- B. depends upon the water level in distributary
- C. depends upon the water level in the water course
- D. depends upon the water levels of both, i.e. distributary and water course
- E. none of these. Discuss
Correct Answer: is independent of water levels in the distributary and water course
- 3. The uplift pressure on the roof of an inverted syphon, is maximum when
Options- A. drain in running dry
- B. canal is running dry
- C. canal is running with F.S.L.
- D. drain is running with H.F.L. Discuss
Correct Answer: drain is running with H.F.L.
- 4. While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are available. These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3
Options- A. an aqueduct
- B. a syphon aqueduct
- C. a super passage
- D. a syphon. Discuss
Correct Answer: an aqueduct
- 5. A fall which maintains its depth, is
Options- A. a trapezoidal notch fall
- B. a low weir fall
- C. a rectangular notch fall
- D. all the above. Discuss
Correct Answer: all the above.
- 6. If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor down stream of the crestwall, is given by the equation
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 7. For standing crops in undulating sandy fields, the best method of irrigation, is
Options- A. sprinkler irrigation
- B. free flooding
- C. check method
- D. furrow method
- E. none of these. Discuss
Correct Answer: sprinkler irrigation
- 8. To hold hydraulic jumps, baffle walls are provided in
Options- A. Sarda type falls
- B. English type falls
- C. Montague type falls
- D. Vertical type falls. Discuss
Correct Answer: English type falls
- 9. The level of the fioor of a syphon aqueduct can be obtained
Options- A. by subtracting the depth of the culvert from the canal bed level
- B. by subtracting the thickness of culvert plus the depth of the culvert from the canal bed level
- C. both (a) and (b)
- D. none of these. Discuss
Correct Answer: by subtracting the thickness of culvert plus the depth of the culvert from the canal bed level
- 10. If water table is comparatively high, the irrigation canal becomes useless, due to
Options- A. large amount of seepage
- B. water logging of the cultivated areas
- C. uncertain water demand
- D. spread of malaria
- E. all the above. Discuss
Correct Answer: all the above.
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