Irrigation problems
- 1. The depth of rice root zone, is
Options- A. 50 cm
- B. 60 cm
- C. 70 cm
- D. 80 cm
- E. 90 cm Discuss
Correct Answer: 90 cm
- 2. Fundamental momentum equation for a hydraulic jump, is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 3. Pick up the incorrect statement from the following
Options- A. Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
- B. Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
- C. Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
- D. None of these. Discuss
Correct Answer: None of these.
- 4. When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called
Options- A. syphon
- B. aqueduct
- C. super passage
- D. syphon-aqueduct. Discuss
Correct Answer: super passage
- 5. For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is
Options- A. zero
- B. 0.25
- C. 0.50
- D. 0.75
- E. 1.00 Discuss
Correct Answer: 1.00
- 6. The discharge over a trapezoidal crest of a Sarda fall with free over fall conditions, is
Options- A. 0.45 2g . LH3/2 (H/B)1/3
- B. 0.45 2g . LH2/3 (H/B)2/3
- C. 0.45 2g . LH3/2 (H/B)1/6
- D. 0.45 2g . LH1/6 (H/B)3/2 Discuss
Correct Answer: 0.45 2g . LH3/2 (H/B)1/6
- 7. A water-logged land is found suitable for cultivation due to
Options- A. ease of tillage for preparation of the field for optimum condition of germination
- B. absence of aeration of soil from root zone of the plant
- C. regular supply of water to plants from the water table by capillary action
- D. none of these. Discuss
Correct Answer: none of these.
- 8. In a Sarda type fall, the rectangular crest, may be used for discharge upto
Options- A. 6 cumecs
- B. 10 cumecs
- C. 14 cumecs
- D. 20 cumecs
- E. 25 cumecs. Discuss
Correct Answer: 14 cumecs
- 9. If q is the discharge per unit width of a channel and D1 D2 are the depths of water before and after hydraulic jump, the following relationship is true
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called
Options- A. syphon
- B. super passage
- C. aqueduct
- D. super-aqueduct
- E. syphon aqueduct. Discuss
Correct Answer: syphon aqueduct.
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