Worksheets28/01/26-Civilwar-Overseer Grade 1-Soil waterquality& irr requi.
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Poor quality irrigation water ultimately leads to long-term soil infertility mainly due to
a)
Increased evaporation losses
b)
Accumulation of dissolved salts in root zone
c)
Reduced rainfall infiltration
d)
Excess organic matter deposition
2.
Excess sodium ions in irrigation water affect soil primarily by
a)
Increasing soil acidity
b)
Destroying soil aggregates
c)
Increasing capillary rise
d)
Improving soil permeability
3.
Which of the following impurities is toxic even in very small quantities in irrigation water?
a)
Chlorides
b)
Sulphates
c)
Boron
d)
Carbonates
4.
Irrigation water classified as C3 high salinity is
a)
Suitable for all soils
b)
Suitable only for sandy soils
c)
Unsuitable for poorly drained soils
d)
Completely unsuitable for irrigation
5.
Sodium Absorption Ratio mainly indicates the hazard related to
a)
Soil salinity
b)
Soil permeability reduction
c)
Toxic element concentration
d)
Osmotic pressure due to salts
6.
Irrigation water with SAR value between 18 and 26 falls under which category?
a)
Low sodium water
b)
Medium sodium water
c)
High sodium water
d)
Very high sodium water
7.
Which Indian crop season generally requires the highest quantity of irrigation water?
a)
Rabi
b)
Zaid
c)
Plantation season
d)
Kharif
8.
Delta of a crop is best interpreted as
a)
Maximum irrigation depth per application
b)
Total irrigation depth spread uniformly over the base period
c)
Available soil moisture depth
d)
Effective rainfall during crop growth
9.
Higher duty of water indicates
a)
Larger water losses
b)
Greater crop water requirement
c)
More area irrigated by unit discharge
d)
Lower irrigation efficiency
10.
Along a canal system duty increases towards the field mainly because
a)
Crop water demand decreases
b)
Channel slope increases
c)
Conveyance losses reduce
d)
Discharge increases
100 %
