Irrigation Engineering MCQs
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Which type of irrigation is most suitable for undulating terrain?
A) Furrow irrigation
B) Basin irrigation
C) Drip irrigation
D) Border irrigation
Answer: C) Drip irrigation -
The duty of water is defined as:
A) Area irrigated per unit discharge
B) Discharge per unit area
C) Volume of water per unit time
D) Depth of water applied
Answer: A) Area irrigated per unit discharge -
Kor watering refers to:
A) Last watering before harvest
B) Light watering after sowing
C) First watering after sowing
D) Heavy watering during flowering
Answer: C) First watering after sowing -
Which irrigation method has the highest water use efficiency?
A) Surface irrigation
B) Sprinkler irrigation
C) Drip irrigation
D) Furrow irrigation
Answer: C) Drip irrigation -
A canal aligned along the slope of a country is called:
A) Ridge canal
B) Contour canal
C) Side slope canal
D) Alluvial canal
Answer: B) Contour canal -
What is the duty of 1 cumec of water if it irrigates 2000 hectares?
A) 1000 hectares
B) 2000 hectares
C) 1500 hectares
D) 2500 hectares
Answer: B) 2000 hectares -
Consumptive use of water includes:
A) Only evaporation
B) Evaporation and transpiration
C) Surface runoff
D) Deep percolation
Answer: B) Evaporation and transpiration -
Which soil has the highest water holding capacity?
A) Sandy soil
B) Clay soil
C) Loamy soil
D) Silt soil
Answer: B) Clay soil -
In canal design, Lacey’s theory is used for:
A) Gravity dam stability
B) Seepage control
C) Design of stable channels
D) Design of cross-drainage works
Answer: C) Design of stable channels -
Which crop requires the maximum amount of water?
A) Wheat
B) Rice
C) Cotton
D) Maize
Answer: B) Rice -
Which of the following is a perennial irrigation system?
A) Direct irrigation
B) Storage irrigation
C) Lift irrigation
D) Combined irrigation
Answer: B) Storage irrigation -
The unit of delta (Δ) in irrigation is:
A) m³/sec
B) hectare-meter
C) meter
D) liter
Answer: C) meter -
What is the principal cause of waterlogging?
A) Excessive irrigation
B) Deficient irrigation
C) High evaporation
D) Sandy soil
Answer: A) Excessive irrigation -
Which device measures the discharge in open channels?
A) Pitot tube
B) Parshall flume
C) Bourdon gauge
D) Hydrometer
Answer: B) Parshall flume -
The process of supplying water below the soil surface by gravity is called:
A) Surface irrigation
B) Sub-surface irrigation
C) Sprinkler irrigation
D) Drip irrigation
Answer: B) Sub-surface irrigation -
The field irrigation efficiency is generally:
A) 50-60%
B) 70-80%
C) 80-90%
D) 30-40%
Answer: B) 70-80% -
Which type of dam is generally used for storing irrigation water?
A) Weir
B) Gravity dam
C) Barrage
D) Aqueduct
Answer: B) Gravity dam -
The term ‘delta’ in irrigation refers to:
A) Time required to irrigate a crop
B) Total depth of water required by crop
C) Frequency of irrigation
D) Water flow rate
Answer: B) Total depth of water required by crop -
The best suited irrigation method for row crops like maize and sugarcane is:
A) Basin irrigation
B) Furrow irrigation
C) Sprinkler irrigation
D) Flood irrigation
Answer: B) Furrow irrigation -
The critical moisture content for plants is when:
A) Evaporation stops
B) Water absorption is maximum
C) Plants start wilting
D) Photosynthesis ceases
Answer: C) Plants start wilting
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In irrigation engineering, 'intensity of irrigation' is expressed as:
A) hectares per hectare
B) hectares per cumec
C) percent
D) meters
Answer: C) percent -
The primary function of an aqueduct in canal systems is:
A) To regulate flow
B) To allow canal over a drainage
C) To store water
D) To lift water
Answer: B) To allow canal over a drainage -
Field capacity of soil refers to:
A) Maximum water held against gravity
B) Water drained completely
C) Water held at saturation
D) Hygroscopic water only
Answer: A) Maximum water held against gravity -
The outlet that draws water irrespective of water level is called:
A) Non-modular outlet
B) Semi-modular outlet
C) Modular outlet
D) Rigid module
Answer: C) Modular outlet -
Which canal alignment is preferred in plain terrain?
A) Ridge alignment
B) Contour alignment
C) Side slope alignment
D) Cross slope alignment
Answer: A) Ridge alignment -
If the base width of a canal is 6 m, depth 2 m and side slopes 1:1, what is the top width?
A) 6 m
B) 8 m
C) 10 m
D) 12 m
Answer: C) 10 m -
The factor affecting crop consumptive use the most is:
A) Wind speed
B) Humidity
C) Sunshine hours
D) All of these
Answer: D) All of these -
The best irrigation method for hilly terrain is:
A) Drip irrigation
B) Sprinkler irrigation
C) Furrow irrigation
D) Basin irrigation
Answer: B) Sprinkler irrigation -
Seepage loss in canals is least in:
A) Sandy soil
B) Clay soil
C) Gravel soil
D) Silt soil
Answer: B) Clay soil -
In border strip irrigation, width of strip generally ranges from:
A) 5 to 10 m
B) 10 to 15 m
C) 15 to 20 m
D) 20 to 25 m
Answer: A) 5 to 10 m -
The wilting point moisture is:
A) Available to plants
B) Not available to plants
C) Same as field capacity
D) Greater than saturation capacity
Answer: B) Not available to plants -
Which irrigation method is highly suitable for orchards and vineyards?
A) Furrow
B) Basin
C) Drip
D) Border strip
Answer: C) Drip -
Cross drainage work where canal passes under the drainage is called:
A) Aqueduct
B) Super passage
C) Canal siphon
D) Syphon aqueduct
Answer: B) Super passage -
Critical rainfall is that rainfall:
A) Causing floods
B) Fully satisfying crop needs
C) Causing droughts
D) Useless for irrigation
Answer: B) Fully satisfying crop needs -
The frequency of irrigation is highest for:
A) Sandy soils
B) Clay soils
C) Loamy soils
D) Peaty soils
Answer: A) Sandy soils -
Which parameter is most directly controlled by drip irrigation?
A) Soil temperature
B) Soil moisture
C) Plant respiration
D) Solar radiation
Answer: B) Soil moisture -
The term 'command area' refers to:
A) Area between two drainage channels
B) Area served by a water source
C) Only area of actual field crops
D) Area covered by a city
Answer: B) Area served by a water source -
The device used to measure soil moisture tension is:
A) Lysimeter
B) Pyranometer
C) Tensiometer
D) Hygrometer
Answer: C) Tensiometer -
In sprinkler irrigation, which factor primarily affects droplet size?
A) Pressure
B) Nozzle size
C) Pipe diameter
D) Soil texture
Answer: B) Nozzle size -
The application efficiency of a well-designed drip irrigation system is about:
A) 55-65%
B) 65-75%
C) 85-90%
D) 45-55%
Answer: C) 85-90%
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