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# Determination of Coefficient of Permeability

1 - Question

Permeability can be determined by direct measurement with the help of ___________

a) Permeameter

b) Consolidation test

c) Horizontal capillary test

d) Pumping-out test

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Answer: aExplanation: Permeability of soil can be determined by permeameters, by allowing the water to flow through soil sample under either constant head or under variable head.

2 - Question

Which of the following formula, cannot be used for determining the permeability of soil?

a) Jacky’s formula

b) Allen Hazen’s formula

c) Kozney’s formula

d) Darcy’s formula

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Answer: dExplanation: In Darcy’s equation or Darcy’s law, there is no permeability constant. q = k i A Hence it cannot be used for finding permeability of soil.

3 - Question

Coefficient of permeability of soil can be determined by which of the following method?

a) Laboratory methods

b) Field methods

c) Indirect methods

d) All of the mentioned

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Answer: dExplanation: The coefficient of permeability can be determined by the following methods: i. Laboratory method – constant head permeability and falling head permeability test ii. Field method –pumping-out and pumping-in test iii. Indirect methods- horizontal capillary test and consolidation test data.

4 - Question

Allen Hazen’s formula is given by which of the following equations?

a) K = 100m2

b) K = C D102

c) K = 200De2e2

d) None of the mentioned

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Answer: bExplanation: Allen Hazen’s formula is K=CD102, where c is constant, which is taken as approximately equal to 100 when D10 is expressed in cm.

5 - Question

The unit of coefficient of absolute permeability(K) is ____________

a) Kg/cm

b) m/s2

c) m2

d) All of the mentioned

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Answer: cExplanation: Since K has the dimension of area (i.e. [k] = [L2]), the unit of K is m2.

6 - Question

Coefficient of absolute permeability (K) depends on ____________

a) Permeant

b) Properties of soil mass

c) Degree of saturation

d) All of the mentioned

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Answer: bExplanation: From the equation of coefficient of absolute permeability, K = C (e3/1+e) D3 We can find that coefficient of permeability is independent of the properties of permeant (i.e. water) and it depends solely on the properties of soil mass.

7 - Question

In Terzaghi’s formula K = 200De2e2, De2 represents ____________

a) Effective grain shape

b) Void ratio

c) Effective grain size

d) Permeability

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Answer: cExplanation: De=effective grain size, the diameter of the sphere for which the ratio of its volume to its surface area is the same as the similar ratio for a given assemblage of soil particles.

8 - Question

K = 100Dm2, is given by which of the following formula?

a) Terzaghi’s formula

b) Kozney’s formula

c) Jacky’s formula

d) Allen Hazen’s formula

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Answer: cExplanation: In 1944, Jacky found out the order of magnitude of k can be obtained from all soils from the formula K= 100Dm2, where Dm denotes grain size.

9 - Question

Terzhagi’s formula can be applied for_________

a) Uniform sand

b) Clay soil

c) Coarse-grained soil

d) Fine-grained soil

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Answer: aExplanation: Terzaghi’s formula can be successfully applied to fairly uniform sand, which reflects the effect of grain size and void ratio.