Geotechnical Engineering

Soils Classification

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Permeability of the soil depends on __________
Size of the soil particle
Moisture present in soil
Specific surface of the soil particle
Density of the soil
Explanation:
Permeability of soil greatly depends on the specific surface of the soil because of the viscous effects associated with surface characteristics of the grains.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Microscopic soil particles have a very ___________
Larger specific surface
A larger volume
Small specific surface
Larger diameter
Explanation:
As the specific surface increases as the size of the grain decreases. Therefore Microscopic particles have a large specific surface.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
A factor, which is important for the magnitude of specific surface of soil particles is__________
Grain shape
Grain size
Both size and shape
Grain molecular structure
Explanation:
Specific surface varies for different shapes of particle having the same mass. Hence grain shape is important factor for determining specific surface.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The specific surface of a soil particle will be ___________
Proportional to inter-molecular surface
Inversely proportional to electric force
Proportional to the compressive force
Directly proportional to electric force
Explanation:
The electrical force responsible for inter-particle effect is proportional to the specific surface.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Specific surface(SS) can also expressed as ________
Surface area of the particle per unit volume
Physical properties of the soil
Moisture content of the soil
None of the mentioned
Explanation:
From the expression, specific surface = surface area of particle/volume of the particle, it can be seen that specific surface is the surface area of a particle.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The harmonic diameter, can be found out by using __________
kozney’s method
casagrande method
Skempton’s method
Atterberg method
Explanation:
The harmonic diameter DH can be found by using kozney’s method using the formula
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Specific surface of the soil particle increase very rapidly, as the grain size ____________
Increases
Decreases
Bulges
None of the mentioned
Explanation:
The subdivision of a mass yields greater surface area than the same mass itself. The specific surface of a mass increases as the grain size decreases.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Specific surface is termed as __________
Total volume of soil particles
Total area of soil particles
Total surface area in a unit mass
Ratio of total surface to the total volume
Explanation:
Specific surface is usually defined as the total surface area of the soil particle in a unit mass.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Specific surface of a soil is related with __________
Chemical properties of the soil
Physical properties of the soil
General characteristic of the soil
All of the mentioned
Explanation:
As specific surface is associated with surface characteristics of a particle, therefore it is related with physical properties.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Chemical activity of a clay mineral depends on __________
Electric charge
Surface area
Compactness
Unit mass
Explanation:
The chemical activity of the clay mineral depends upon the surface area, because of the electrical charge of clay minerals is high per unit mass.