MCQs on Soil Permeability and Validity of Darcy Law

By: Prof. Fazal Rehman Shamil

MCQs on Soil Permeability and Validity of Darcy’s Law

Critical Reynolds number varies from where for the validity of Darcy’s law.
(A). 0.1-75
(B). 75-100
(C). 100-175
(D). 175-200
(E). None of these
Multiple Choice Question Answer: a


What is the drainage property of silty clay?
(A). very good
(B). good
(C). fair
(D). very poor
(E). None of these
Multiple Choice Question Answer: d


What should be the Reynolds number for the Darcy’s law to be valid?
(A). greater than one
(B). less than one
(C). equal to one
(D). greater than five
(E). None of these
Multiple Choice Question Answer: b


For which flow conditions in the soil, Darcy’s law of linear dependency is valid?
(A). laminar and turbulent
(B). laminar
(C). turbulent
(D). intermediate
(E). None of these
Multiple Choice Question Answer: a


The linear dependency between the velocity of flow and hydraulic gradient exists, when what is happened to the effective size of soil?
(A). does not exceed 3mm
(B). exceeds 3mm
(C). equal to 3mm
(D). equal to 5mm
(E). None of these
Multiple Choice Question Answer: a


What is the characteristic length in Reynolds number, for the flow-through soils?
(A). uniformity coefficient
(B). coefficient of curvature
(C). coefficient of percolation
(D). average diameter of particles
(E). None of these
Multiple Choice Question Answer: b


When does the coefficient of permeability is equal to velocity of flow?
(A). when the hydraulic gradient is equal to one
(B). when the hydraulic gradient is less than one
(C). when the hydraulic gradient is greater than one
(D). when the hydraulic gradient is equal to zero
(E). None of these
Multiple Choice Question Answer: a


In what cases the Darcy’s law is not valid?
(A). clay
(B). silt
(C). fine sand
(D). coarse-gravel
(E). None of these
Multiple Choice Question Answer: d