In falling head permeability test apparatus, the water head at any time instant is equal to ____________
(a) Difference in the water level
(b) Cross-sectional area of pipe
(c) Height of permeameter
(d) None of the mentioned
This question was addressed to me during an online interview.
My question is from Constant and Falling Head Permeability Test in chapter Permeability of Geotechnical Engineering I