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Worksheets28-01-26 Civilwar-Overseer grade 1-Irrigation eng. topics
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
A farmer observes that his soil becomes very sticky when wet and develops hard cracks when dry. This is likely caused by an excess of which impurity?
a)
Toxic elements like boron
b)
Total dissolved solids (TDS)
c)
Sodium ions (Na+)
d)
none
2.
Which classification of irrigation water is considered unsuitable for irrigation based on Electrical Conductivity?
a)
C1 (0–250 μmhos/cm)
b)
C2 (250–750 μmhos/cm)
c)
C3 (750–2250 μmhos/cm)
d)
C4 (2250–5000 μmhos/cm)
3.
What is the correct formula for Sodium Absorption Ratio (SAR)?
a)
SAR = Na/(Ca+Mg)
b)
SAR = Na/√[(Ca+Mg)/2]
c)
SAR = (Ca+Mg)/Na
d)
SAR = Mg/(Na+Ca)
4.
A soil sample has EC of 5000 μmhos/cm and pH of 8.2. How is this soil classified?
a)
Saline soil
b)
Alkali soil
c)
Saline-alkali soil
d)
Normal soil
5.
To reclaim sodic (alkali) soils, which of the following treatments is recommended?
a)
Leaching with fresh water only
b)
Adding boron and selenium
c)
Gypsum (calcium sulphate) treatment
d)
Increasing SAR value
6.
Which of the following crops is classified as a Kharif crop in India?
a)
Wheat
b)
Mustard
c)
Rice
d)
Barley
7.
If the base period of a crop is 100 days and the duty is 1000 ha per cumec, what is the delta of the crop in cm?
a)
8.64 cm
b)
86.4 cm
c)
864 cm
d)
0.864 cm
8.
As water moves from the head of a main canal towards the field, how does the duty of water change?
a)
It decreases due to seepage losses
b)
It remains constant
c)
It increases as conveyance losses reduce
d)
It fluctuates randomly
9.
What is meant by Kor watering in irrigation practice?
a)
Pre-sowing irrigation
b)
Total water during base period
c)
First watering after germination
d)
Extra overlap water
10.
In canal planning, what does the Time Factor represent?
a)
Time between sowing and harvesting
b)
Fraction of canal capacity utilised
c)
Time between first and last watering
d)
Fraction of time the canal actually runs
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