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Engineering :: Irrigation Engineering


11.  Irrigation is supplementary to rainfall.
A. Agree B. Disagree

12.  Irrigation
A. increases B. decreases

13.  Irrigation is said to be a science of survival.
A. Correct B. Incorrect

14.  A useful soil moisture for plant growth is
A. capillary water B. gravitational water
C. hygroscopic water D. all of these

15.  The amount of water required to fill up the pore spaces in soil particles by replacing all air held in pore spaces, is known as
A. field capacity B. saturation capacity
C. available moisture D. all of these

16.  The moisture content of the soil, after free drainage has removed most of the gravity water, is known as
A. field capacity B. saturation capacity
C. wilting co-efficient D. available moisture

17.  The water content at which plants can no-longer extract sufficient water from the soil for its growth, is called
A. field capacity B. saturation capacity
C. permanent wilting point D. available moisture

18.  Available moisture may be defined as the
A. moisture content at permanent wilting point B. difference in water content of the soil between field capacity and permanent wilting
C. maximum moisture holding capacity D. all of these

19.  The field capacity of a soil depends upon
A. capillary tension in soil B. porosity of soil
C. either (a) or (b) D. both (a) and (b)

20.  Capillary water is a useful soil moisture for the growth of plants.
A. Yes B. No




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