Free Irrigation and Water Management MCQs with Answers
262 Irrigation and Water Management MCQs from Agriculture, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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262 questions · page 4 of 14
- A. Standard flood
- B. Maximum probable flood
- C. Very high flood
- D. Storm water flood
Explanation: The maximum probable flood is the greatest flood expected from the most severe reasonable combination of meteorological and hydrological…
Correct answer: Maximum probable flood- A. Stable river
- B. Sub-stable river
- C. Sediment river
- D. Aggrading river
Explanation: An aggrading river gains sediment, causing its bed to rise and often forming dunes or other deposits.
Correct answer: Aggrading river- A. Deltaic river
- B. Unstable river
- C. Stable river
- D. Degrading river
Explanation: A river that divides into distributary channels near its mouth and builds a roughly triangular depositional landform is associated with a…
Correct answer: Deltaic river- A. Flashy
- B. Virgin
- C. Tidal
- D. Deltaic
Explanation: A virgin river loses its flow inland before reaching the sea or another river, usually because of seepage, evaporation, or insufficient…
Correct answer: Virgin- A. Toe wall
- B. Protective wall
- C. Launching apron
- D. Guide bank
Explanation: A launching apron is a layer of stone placed beyond the bank toe so that, if scour removes supporting bed material, the stones settle and…
Correct answer: Launching apron- A. Repelling
- B. Attracting
- C. Impermeable
- D. Permeable
Explanation: A repelling groyne points upstream and deflects the current away from the protected bank.
Correct answer: Repelling67. The rise in river water level at up stream due to construction of weir is called__________________?
- A. Pond level
- B. Afflux
- C. HFL
- D. FSL
Explanation: Afflux is the rise in the upstream river water level caused by an obstruction such as a weir or bridge.
Correct answer: Afflux- A. Under sluices
- B. Scouring sluices
- C. Head sluices
- D. Sluice gates
Explanation: Head sluices or the canal head regulator control the entry of relatively silt-free water into the canal from the upper water layers.
Correct answer: Head sluices- A. All are correct
- B. Retaining wall
- C. Toe wall
- D. Divide wall
Explanation: A divide wall is built at right angles to the weir axis to separate the normal weir bays from the under-sluice or undersluice portion.
Correct answer: Divide wall- A. Retaining wall
- B. Breast wall
- C. Divide wall
- D. Cantilever wall
Explanation: A breast wall is the heavy wall carried on the regulator piers from pond level to high flood level, preventing floodwater from spilling…
Correct answer: Breast wall- A. Vortex pipes
- B. Silt ejectors
- C. Silt excluders
- D. Silt control structures
Explanation: Silt excluders are placed upstream of a canal head regulator to guide sediment-laden bottom water away, allowing clearer upper water to…
Correct answer: Silt excluders- A. Afflux
- B. Final depth
- C. Down stream water depth
- D. Sequent depth
Explanation: In a hydraulic jump, the shallow incoming depth is the initial depth and the greater depth after the jump is the sequent depth.
Correct answer: Sequent depth- A. Permeable
- B. Rocky
- C. Impermeable
- D. Stable
Explanation: Permeable foundation soils allow seepage beneath a hydraulic structure, producing uplift pressure and piping or undermining at the…
Correct answer: Permeable- A. Submerged exit gradient
- B. Balanced exit gradient
- C. Critical exit gradient
- D. All are correct
Explanation: The critical exit gradient is reached when the upward seepage force equals the submerged weight of the soil particles, making the soil…
Correct answer: Critical exit gradient- A. Blight
- B. Lane
- C. Khosla
- D. Darcy
Explanation: Khosla developed the theory of seepage flow and used flow nets to analyse hydraulic structures, including uplift pressure and exit…
Correct answer: Khosla- A. Stone blocks
- B. Stone apron
- C. Stone boom
- D. Vertical cutoff
Explanation: A vertical cutoff at the downstream exit lengthens the seepage path and reduces the exit gradient, helping prevent piping and scour.
Correct answer: Vertical cutoff- A. 3:1 to 5:1
- B. 2.5:1 to 3:1
- C. 2:1 to 2.5:1
- D. 5:1 to 6
Explanation: A downstream glacis slope of about 3:1 to 5:1 promotes a strong hydraulic jump and effective energy dissipation in the stilling basin.
Correct answer: 3:1 to 5:1- A. Lowering down of bed
- B. Retrogression
- C. Ponding on down stream
- D. All are correct
Explanation: Retrogression is the progressive lowering and erosion of the riverbed downstream of a weir or barrage.
Correct answer: Retrogression79. The water way from a weir is determined by using Lacey's wetted perimeter i.e. P=_______(Q)1/2 ?
- A. 3.50
- B. 3.75
- C. 4.75
- D. 5.75
Explanation: For Lacey's regime theory, the wetted perimeter is commonly written as P = 4.75√Q when the silt factor is taken as unity.
Correct answer: 4.75- A. Cistern
- B. Water pool
- C. Down stream pond
- D. Water cushion
Explanation: A cistern is a depressed stilling basin or water pool provided downstream of a hydraulic structure, where the water cushion dissipates the…
Correct answer: Cistern