A) capillary, hygroscopic, water vapour combined
B) capillary only
C) gravitational only
D) gravitational as well as
Correct Answer: A
Solution :
The amount of water retained by a unit weight of soil after complete drainage under standerdised condition is called field capacity. The field capacity refers to all the four forms of water present in a unit weight of soil. The forms of water are : (i) Capillary water: The water present in between the capillary space of soil particles. (ii) Hygroscopic water: This water present in form of thin film around the soil particles. (iii) Combined water: This water form lies in combined form such as that with silicates. (iv) Water vapours: This form of water present in porespace. (v) Gravitational water: The water reaching the deep saturated zones of soil.
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