Terzaghi’s theory of one dimensional consolidation assumes
A. Soil is homogeneous and fully saturated
B. Water and soil particles are incompressible
C. Deformation of the soil, is entirely due to change in volume
D. All the above
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Pick up the correct statement from the following:
A. The dry density reduces by addition of water after attaining optimum moisture content
B. The line joining the peak of three moisture content graphs obtained by using three compactive energies, is called line of optimus
C. Well graded coarse grained soils can be compacted to a very high density as compared to fine grained soils
D. All the above
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Pick up the correct statement from the following:
A. The object of classifying soils is to arrange them into groups according to their properties and behaviour
B. A soil classification system is meant to provide an accepted and systematic method of describing the various types of soils eliminating personal factors
C. The first category of soil classification is based on grain size of the soil
D. All the above
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Coefficient of compressibility is
A. constant for any type of soil
B. different for different types of soils and also different for a soil under different states of consolidation
C. different for different types of soils but same for a soil under different states of consolidation
D. independent of type of soil but depends on the stress history of soil
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Coefficient of consolidation for clays normally
A. decreases with increase in liquid limit
B. increases with increase in liquid limit
C. first increases and then decreases with increase in liquid limit
D. remains constant at all liquid limits
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Select the incorrect statement.
A. In a direct shear box test, the plane of shear failure is predetermined
B. Better control is achieved on the drainage of the soil in a tri-axial compression test
C. Stress distribution on the failure plane in the case of tri-axial compression test is uniform
D. Unconfined compression test can be carried out on all types of soils
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Select the correct statement.
A. A uniform soil has more strength and stability than a non-uniform soil.
B. A uniform soil has less strength and stability than a non-uniform soil.
C. Uniformity coefficient does not affect strength and stability.
D. Uniformity coefficient of a poorly graded soil is more than that of a well graded soil.
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Select the incorrect statement.
A. Bearing capacity of a soil depends upon the amount and direction of load.
B. Bearing capacity of a soil depends on the type of soil.
C. Bearing capacity of a soil depends upon shape and size of footing.
D. Bearing capacity of a soil is indepen-dent of rate of loading.
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Select the correct statement.
A. coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay
B. coefficient of compressibility of an over-consolidated clay is greater than that of a normally consolidated clay
C. coefficient of compressibility is cons-tant for any clay
D. none of the above
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Select the incorrect statement.
A. Effective cohesion of a soil can never have a negative value.
B. Effective angle of internal friction for coarse grained soils is rarely below 30°
C. Effective angle of internal friction for a soil increases as state of compact-ness increases.
D. Effective angle of internal friction is a complicated function of mineralogy and clay size content.
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Select the correct statement.
A. The greater the viscosity, the greater is permeability.
B. The greater the unit weight, the greater is permeability.
C. The greater the unit weight, the smaller is permeability.
D. Unit weight does not affect per-meability.
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Select the correct statement.
A. Unit weight of dry soil is greater than unit weight of wet soil.
B. For dry soils, dry unit weight is less than total unit weight.
C. Unit weight of soil increases due to submergence in water.
D. Unit weight of soil decreases due to submergence in water.
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A plane inclined at an angle ‘φ’ to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as
A. Natural slope line
B. Repose line
C. The φ line
D. All the above
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Quick sand is a
A. type of sand
B. flow condition occurring in cohesive soils
C. flow condition occurring in cohesionless soils
D. flow condition occurring in both cohesive and cohesionless soils
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Time factor for a clay layer is
A. a dimensional parameter
B. directly proportional to permeability of soil
C. inversely proportional to drainage path
D. independent of thickness of clay layer
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The slope of isochrone at any point at a given time indicates the rate of change of
A. effective stress with time
B. effective stress with depth
C. pore water pressure with depth
D. pore water pressure with time
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When the degree of saturation is zero, the soil mass under consideration represents
A. one phase system
B. two phase system with soil and air
C. two phase system with soil and water
D. three phase system
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Hydrometer readings are corrected for:
A. Temperature correction
B. Meniscus correction
C. Dispersing agent correction
D. Temperature, meniscus and dispersing agent corrections
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During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2 , the pore water pressure increases from 0.07 N/mm2 to 0.15 N/mm2 . Skempton’s pore pressure parameter B is
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Inorganic soils with low compressibility are represented by
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