Virtual Labs

1. The constant head method is suitable for ____ type of soils.

a: Coarse grained soils Explanation

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b: Fine grained soils Explanation

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c: Cohesive soils Explanation

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d: Cohesion less soils Explanation

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2. The variable head test is suitable for ____ type of soils.

a: Coarse grained soils Explanation

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b: Fine grained soils Explanation

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c: Cohesive soils Explanation

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d: Cohesion less soils Explanation

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3. Permeability is defined as the property of soil which allows:

a: Air to pass through its voids Explanation

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b: Water to pass through its voids Explanation

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c: Solids to move within the mass Explanation

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d: Heat to conduct through the particles Explanation

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4. Which test is used to find the coefficient of permeability of a partially saturated soil?

a: Constant head method Explanation

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b: Variable head test Explanation

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c: Capillary permeability test Explanation

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d: Consolidation test data Explanation

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5. The coefficient of permeability by the variable head test is given by which of the following formulas?

a: k = (a * L / (A * t)) * ln(h1 / h2) Explanation

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b: k = (a * L / (A * t)) * ln(h2 / h1) Explanation

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c: k = (A * L / (a * t)) * ln(h1 / h2) Explanation

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d: k = (a * t / (A * L)) * ln(h1 / h2) Explanation

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6. Darcy's Law (v = ki) is valid only when the flow through the soil is:

a: Turbulent Explanation

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b: Laminar Explanation

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c: Unsteady Explanation

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d: Rotational Explanation

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7. A soil sample has a void ratio of 0.6. If the permeability of the soil at a void ratio of 0.4 was 1 x 10⁻⁴ cm/s, estimate the new permeability (assuming k is proportional to e³/(1+e)).

a: 2.25 x 10⁻⁴ cm/s Explanation

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b: 3.50 x 10⁻⁴ cm/s Explanation

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c: 4.15 x 10⁻⁴ cm/s Explanation

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d: 5.00 x 10⁻⁴ cm/s Explanation

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8. The hydraulic gradient (i) is defined as:

a: Head loss per unit length of flow Explanation

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b: Total head at a point Explanation

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c: Velocity of flow through the soil Explanation

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d: Area of the sample divided by time Explanation

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9. Which of the following factors has the most significant impact on the permeability of a soil?

a: Soil color Explanation

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b: Particle size (D10) Explanation

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c: Specific gravity of solids Explanation

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d: Atmospheric pressure Explanation

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