Worksheets27/01/26-Civilwar-Overseer grade 1-Irrigation engineering topics
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Soil moisture tension is also known as all EXCEPT
a)
Capillary potential
b)
Matric suction
c)
Force of suction
d)
Osmotic pressure
2.
Which instrument is most suitable for measuring low soil moisture suction?
a)
Lysimeter
b)
Pressure plate apparatus
c)
Tensiometer
d)
Infiltrometer
3.
The fundamental relationship between soil moisture tension and moisture content is
a)
Both increase together
b)
Both decrease together
c)
Moisture tension increases while moisture content decreases
d)
Moisture tension is independent of moisture content
4.
Soil moisture tension at field capacity for clay soil is approximately
a)
1 atm
b)
1/10 atm
c)
1/3 atm
d)
15 atm
5.
Soil moisture stress is defined as the sum of
a)
Matric suction + osmotic suction
b)
Capillary water + hygroscopic water
c)
Field capacity + permanent wilting point
d)
Available moisture + RAM
6.
At saturation capacity of soil the soil moisture tension is
a)
Maximum
b)
15 atm
c)
Equal to field capacity
d)
Zero
7.
Field capacity of soil represents
a)
Lower limit of capillary water
b)
Upper limit of hygroscopic water
c)
Upper limit of capillary water
d)
Total soil water content
8.
Available moisture in soil is calculated as
a)
Field capacity -Permanent wilting point
b)
Readily available moisture-Permanent wilting point
c)
Field capacity + Permanent wilting point
d)
none
9.
Readily available moisture is generally taken as
a)
50 percent of available moisture
b)
60 percent of available moisture
c)
75 percent of available moisture
d)
90 percent of available moisture
10.
Equivalent depth of available moisture storage capacity of soil is given by:
( S-Dry bulk density,d-root zone depth,FC-Field capacity,PWP-Permanent wilting point)
a)
S × d × FC
b)
S × d × PWP
c)
S × d × (FC-PWP)
d)
0.75 × S × d × FC
100 %
