Irrigation problems
- 1. The consumptive use of water for a crop
Options- A. is measured as the volume of water per unit area
- B. is measured as depth of water on irrigated area
- C. may be supplied partly by precipitation and partly by irrigation
- D. all the above. Discuss
Correct Answer: all the above.
- 2. Lacy's regime condition is obtained if
Options- A. silt grade in the channel is variable
- B. discharge in the channel is variable
- C. silt charge in the channel is variable
- D. channel flows in unlimited, incoherent alluvium of the same character as that transported material. Discuss
Correct Answer: channel flows in unlimited, incoherent alluvium of the same character as that transported material.
- 3. The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is
Options- A. 8 cm
- B. 10 cm
- C. 12 cm
- D. 14 cm
- E. 16 cm Discuss
Correct Answer: 12 cm
- 4. For a standing crop, the consumptive use of water is equal to the depth of water
Options- A. transpired by the crop
- B. evaporated by the crop
- C. transpired and evaporated by the crop
- D. used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil. Discuss
Correct Answer: used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil.
- 5. The useful moisture of soil, is equal to its
Options- A. field capacity
- B. saturation capacity
- C. moisture content at permanent wilting point
- D. difference between filed capacity and permanent wilting point within the root zone of plants. Discuss
Correct Answer: difference between filed capacity and permanent wilting point within the root zone of plants.
- 6. If the optimum depth of kor watering for a crop is 15.12 cm, the outlet factor for the crop for four week period in hectares per cumec, is
Options- A. 1000
- B. 1200
- C. 1400
- D. 1600
- E. 2000 Discuss
Correct Answer: 1600
- 7. A fall in a canal bed is generally provided, if
Options- A. ground slope exceeds the designed bed slope
- B. designed bed slope exceeds the ground slope
- C. ground slope is practically the same as the designed bed slope
- D. none of these. Discuss
Correct Answer: ground slope exceeds the designed bed slope
- 8. If V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to
Options- A.
- B.
- C.
- D.
- E.
Discuss
Correct Answer:
- 9. The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
Options- A. 30°
- B. 45°
- C. 60°
- D. 90° Discuss
Correct Answer: 45°
- 10. According to Khosla, the exist gradient of surface flow
Options- A. depends upon the b/d ratio
- B. is independent of the b/d ratio
- C. is independent of the depths of d/s cut off walls
- D. none of these. Discuss
Correct Answer: depends upon the b/d ratio
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