Irrigation problems
- 1. The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than
Options- A. 10 cm
- B. 20 cm
- C. 30 cm
- D. 40 cm Discuss
Correct Answer: 30 cm
- 2. Pick up the correct statement from the following:
Options- A. Water table generally follows the ground surface above it with a few exceptions
- B. Static level of water in an open well indicates the position of the water table
- C. Saturated pores of a soil in the capillary zone above water table have negative pressure
- D. At water table, hydrostatic pressure is zero
- E. All the above. Discuss
Correct Answer: All the above.
- 3. Effective precipitation for a crop may be defined as
Options- A. total precipitation minus the loss due to evaporation
- B. total precipitation minus the loss due to infiltration
- C. total precipitation during the crop period
- D. available water stored in soil within root zone of the crop. Discuss
Correct Answer: available water stored in soil within root zone of the crop.
- 4. Process of meandering is due to
Options- A. sediment load of streams
- B. discharge and hydraulic properties of streams
- C. relative erodibility of the bed and banks
- D. all the above. Discuss
Correct Answer: all the above.
- 5. Cross regulators in main canals are provided
Options- A. to regulate water supply in the distributaries
- B. to increase water head upstream when a main canal is running with low supplies
- C. to overflow excessive flow water
- D. none of these. Discuss
Correct Answer: to increase water head upstream when a main canal is running with low supplies
- 6. Disposal of extra excavated earth of canals, is utilised to provide a spoil bank on
Options- A. left side
- B. right side
- C. both sides
- D. all the above. Discuss
Correct Answer: all the above.
- 7. If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to
Options- A. m
- B. m3
- C. m1/2
- D. m1/3
- E. m2/3 Discuss
Correct Answer: m1/2
- 8. The ratio of the head recovered to the head put in, is known as
Options- A. efficiency
- B. sensitivity
- C. flexibility
- D. modular limit. Discuss
Correct Answer: efficiency
- 9. The water face of the guide banks, is protected by
Options- A. one men stone pitching
- B. two man stone pitching
- C. three man stone pitching
- D. four man stone pitching
- E. five man stone pitching. Discuss
Correct Answer: one men stone pitching
- 10. To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls
Options- A. of R.C.C. or steel plate 8 cm thick
- B. of height l/3rd to l/4th the depth of water in the main canal
- C. spaced at interval of
times their heights - D. extending about one metre beyond a line drawn at an inclination of 2 : 1 to the axis of main canal
- E. all the above. Discuss
Correct Answer: all the above.
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