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Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test - Test: Principle of Effective Stress, Capillarity & Permeability - 1

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Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 1

In a falling head permeability test on a soil, the time taken for the head to fall from hto h1 is t. The test is repeated with same initial head h0, the final head h' is noted in time t/2. Which one of the following equations gives the relation between h', hand h1?

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 1

In falling head permeability test,

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 2

Approximate ratios of the permeabilities of two clean soils having D10 = 0,6 mm and D10 = 0.3 mm respectively is

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 2

Ratio of permeabilities of the two soils is given by,

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Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 3

Which one of the following expressions represents the shear strength of soil at point X? Angle of shear resistance of soil is ϕ and symbols γw' γsat' γsub' γdry stand for unit weights of water, saturated soil, submerged soil and dry soil respectively.

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 3

As the free water surface on both sides is same so there is no flow occurring through soil. Thus effective stress at X,
σ' = γwH1 + γsatH - γw(H + H1) = γsubH
∴ Shear strength, τ = σ' tanϕ = γsub H tan ϕ

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 4

A stratified soil deposit has three layers of thicknesses: z1 = 4, z2 - 1, z3 = 2 units and the corresponding permeabilities of k1 = 2, k2 = 1 and k3 = 4 units, respectively. The average permeability perpendicular to the bedding planes will be

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 4

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 5

In the case of stratified soil layers, the best equation that can be adopted for computing the pressure distribution is

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 5

Westergaard’s equation is applicable for non-isotropic condition commonly encountered in sedimentary stratified deposits.

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 6

The permeability of a soil sample varies (Where d = grain size)

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 7

In the situation shown in the given figure, the coefficient of permeability of the soil is 10-3cm/s. The discharge in one minute will be

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 7

Discharge = Permeability x Area x Head/ Length = 10-3 x 100 x (1/2) = 1/20 cm3/s
Therefore, volume flown in 1 minute = 60 seconds
= 60/20 cm3  = 3 cm3 = 3ml

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 8

Effective stress in a soil is the stress carried by the

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 8

Effective stress is a function of the particle contact force.
Pore water pressure acts uniformly on all sides of the particle and does not cause the soil particles to press against each other.

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 9

The coefficient of permeability increases when

Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 10

Which of the following methods is best suited for the determination of permeability of coarse grained soils?

Detailed Solution for Test: Principle of Effective Stress, Capillarity & Permeability - 1 - Question 10

Coarse Grained Soil- Constant Head Method
Fine Grained Soil- Falling Head Method

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