WorksheetsDay 63-Nov 26-worksheet-PWD-Irrigation-Types ,soil water plant
Total questions: 15
Worksheet time: 10mins
Water application efficiency is given by ηa=WfWs×100 . Here Ws represents —
Water diverted at the headworks
Water stored in the root zone
Water lost in percolation
Water required in the canal
A soil having EC>4000 micromhos/cm and pH≤8.5 is classified as —
Alkaline soil
Saline soil
Saline-alkaline soil
Neutral soil
Field capacity of soil is defined as the water content —
When all pore spaces are filled with water
Remaining in the soil after free drainage has ceased
Corresponding to permanent wilting of plants
At the instant of saturation from irrigation
Duty of water is maximum at —
Head of main canal
Tail of main canal
Head of watercourse or field channel
Reservoir
The instrument used to determine consumptive use of water for a crop is —
(a)
A crop with a larger base period will have a lower duty for the same delta. Choose True or False.
True
False
Permanent wilting point is the moisture content at which plants can regain their turgidity after watering. Choose True or False.
True
False
Assertion–Reason: Assertion: Storage duty is expressed in hectares per million cubic metre of water. Reason: In storage irrigation, water is first stored in a reservoir and then supplied to the command. Choose the correct option.
Both assertion and reason are true, and reason is the correct explanation
Both assertion and reason are true, but reason is not the correct explanation
Assertion true, reason false
Assertion false, reason true
The crops grown during April to September under monsoon rains are called ______ crops.
Kharif
Rabi
Zaid
Fodder
The ratio of area irrigated in Rabi season to area irrigated in Kharif season is known as (a) .
Drip irrigation method is also called as trickle irrigation
True
False
Soil moisture tension at field capacity for clay soils is approximately (a) atmosphere.
Choose the correctly matched pair.
Saline soil – pH > 8.5
Alkaline soil – EC > 4000 micromhos/cm
C1 water – EC ≤ 250 micromhos/cm
S3 water – SAR 0–10
A crop has a base period of 120 days and a delta of 120 cm. The duty of water at the field is approximately —
(a)
Net irrigation requirement for a crop is 12 cm. Application efficiency is 75% and water conveyance efficiency is 70%. The gross irrigation requirement (GIR) is approximately —
(a)
