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 8 of 14
- A. 40560ft3
- B. 41560ft3
- C. 42560ft3
- D. 43560 cubic feet
Explanation: One acre contains 43,560 square feet, so an acre-foot of water, being one acre covered to a depth of one foot, contains 43,560 cubic feet.
Correct answer: 43560 cubic feet- A. Effective rain fall
- B. Total rainfall
- C. Monsoon rainfall
- D. All are correct
Explanation: Effective rainfall is the portion of total rainfall that enters the crop root zone and contributes to meeting crop water requirements.
Correct answer: Effective rain fall- A. Cippoletti weir
- B. Venturimeter
- C. Venturiflume
- D. regulator
Explanation: A Venturi flume has a narrowed throat and a raised or shaped floor, allowing discharge to be calculated from the flow conditions at the…
Correct answer: Venturiflume- A. depth/ 3
- B. 2 / 3 depth
- C. depth/ 4
- D. depth/ 2
Explanation: For the most economical rectangular channel, the width is twice the depth, so the hydraulic mean depth or hydraulic radius becomes depth…
Correct answer: depth/ 2- A. Liquids
- B. Steel
- C. Soil
- D. Wood
Explanation: Liquids at rest cannot resist tangential or shear stress, so they cannot transmit a torsional force like solids such as steel, soil, or…
Correct answer: Liquids- A. Pressure head + kinetic head and datum head
- B. Velocity head + kinetic head + datum head
- C. Velocity head + potential head + datum head
- D. The energy head + potential head + datum head
Explanation: The total energy line represents pressure head, velocity or kinetic head, and elevation or datum head together.
Correct answer: Pressure head + kinetic head and datum head- A. All are correct
- B. cm/sec2
- C. cm/sec
- D. cm2/sec
Explanation: Kinematic viscosity equals dynamic viscosity divided by density, giving dimensions of length squared per time.
Correct answer: cm2/sec- A. Sensitivity
- B. Flexibility
- C. Durability
- D. Flow ability
Explanation: Sensitivity measures how much an outlet's discharge changes for a given change in the distributary water level.
Correct answer: Sensitivity- A. 123º
- B. 133!
- C. 143º
- D. 153º
Explanation: The economical central angle for an arch dam is conventionally taken as about 133°, which balances arch length and structural efficiency.
Correct answer: 133!- A. Fish pool
- B. Fish escape
- C. Fish ladder
- D. Fish pond
Explanation: A fish ladder, also called a fish pass, consists of a series of pools or steps that allow fish to move past a weir or barrage.
Correct answer: Fish ladder- A. Full irrigation
- B. Basin irrigation
- C. Furrow irrigation
- D. Field irrigation
Explanation: Field irrigation requirement includes the net water needed by the crop plus water lost during field application.
Correct answer: Field irrigation- A. Furrow irrigation
- B. Basin irrigation
- C. Border irrigation
- D. Check irrigation
Explanation: Basin irrigation surrounds an individual tree with a level border, creating a small pool that holds the supplied water around its root…
Correct answer: Basin irrigation- A. Unit hydrograph
- B. Intensity unit hydrograph
- C. Instantaneous unit hydrograph
- D. Unit hyetgoraph
Explanation: When the duration of the effective rainfall excess approaches zero, the unit hydrograph becomes an instantaneous unit hydrograph.
Correct answer: Instantaneous unit hydrograph154. A plot of graphical representation showing river flow against time is called _____________________?
- A. Monograph
- B. Hyetograph
- C. All are correct
- D. Hydrograph
Explanation: A hydrograph plots stream or river discharge against time. A hyetograph plots rainfall intensity against time, while a monograph is not…
Correct answer: Hydrograph- A. All are correct
- B. Transpiration
- C. Evaporation
- D. Evapotranspiration
Explanation: Evapotranspiration combines evaporation from water and soil surfaces with transpiration from plant tissues.
Correct answer: Evapotranspiration- A. 80%
- B. 100%
- C. 50% l
- D. 20%
Explanation: A reservoir is commonly regarded as having reached the end of its useful life when sedimentation has consumed about 80% of its design…
Correct answer: 80%- A. In a weir with end contractions
- B. In a suppressed weir
- C. In a cippoletti weir
- D. In all weir
Explanation: Aeration holes admit air beneath the nappe of a suppressed weir, preventing excessive sub-atmospheric pressure and nappe sticking.
Correct answer: In a suppressed weir- A. Sharp edged orifice
- B. Broad crested weir
- C. Venturi meter
- D. Cippoletti weir
Explanation: A venturi meter has a very high coefficient of discharge, generally close to unity, because its gradual contraction and expansion produce…
Correct answer: Venturi meter- A. Water tunnel
- B. Seepage Drain
- C. Seepage tunnel
- D. Seepage gallery
Explanation: A seepage gallery is a passage constructed in a dam or its foundation to intercept, collect and drain seepage water.
Correct answer: Seepage gallery- A. Equipotential lines
- B. flow lines
- C. Section lines
- D. Streak lines
Explanation: Flow lines in a flow net indicate the paths followed by water as it moves through the soil beneath a dam.
Correct answer: flow lines