MCQ
1661. Pick up the correct statement from the following:
An unconfined compression test is a special case of triaxial compression test
An unconfined compression test is a special case of direct shear test
The confining pressure is maximum during an unconfined compression test
The cylindrical specimen of a soil is subjected to major principal stress till it fails due to shearing along the plane of the failure
1662. The specific gravity of Calcite is
2.65
2.72
2.85
2.90
1663. Which of the following statements is correct?
Uniformity coefficient represents the shape of the particle size distribution curve.
For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.
A soil is said to be well graded if it has most of the particles of about the same size
None of the above
1664. The direct shear test suffers from the following disadvantage:
Drain condition cannot be controlled
Pore water pressure cannot be measured
Shear stress on the failure plane is not uniform
The area under the shear and vertical loads does not remain constant throughout the test
1665. Which of the following methods is most accurate for the determination of the water content of soil?
Oven drying method
Sand bath method
Calcium carbide method
Pycnometer method
1666. 'Talus' is the soil transported by
Wind
Water
Glacier
Gravitational force
1667. On wetting, cohesive soils,
Loose permeability
Gain shear strength
Loose elasticity
Decrease their shear strength
1668. Pick up the correct statement from the following:
The void space between the soil grains, is filled partly with air and partly with water
In perfectly saturated soil, the voids are completely filled with water
In dry soil, the voids are completely filled with air
All the above
1669. In a flow net
Flow lines and equipotential lines cross each other at right angles
Fields are rectangles whose length is twice the breadth
Smaller the dimensions of the field, smaller will be the hydraulic gradient and velocity of flow through it
For homogeneous soil, the curves are smooth and circular
1670. If the voids of a soil mass are full of air only, the soil is termed as
Air entrained soil
Partially saturated soil
Dry soil
Dehydrated soil
1671. The reduction in volume of soil due to squeezing out of water from the voids, is termed
Primary consolidation
Primary compression
Primary time effect
All the above
1672. The phreatic line in an earth dam may be
Circular
Elliptical
Parabolic
A straight line
1673. The earth pressure of a soil at rest, is proportional to (where is the angle of internal friction of the soil)
tan (45°-)
tan (45°+)
tan2 (45°-)
None of these
1674. Pick up the correct statement from the following:
Failure plane carries maximum shear stress
Failure plane does not carry maximum shear stress
Failure plane carries shear stress equal to maximum shear stress
None of these
1675. If e0, e 0' have their usual meanings, the coefficient of compressibility (ac), is given by
ac (e-e0)/(e'+e0')
ac (e0-e)/(-0')
ac (0')/(e0-e)
ac (0'-)/(e-e0)
1676. The water content of soil, which represents the boundary between plastic state and liquid state, is known as
Liquid limit
Plastic limit
Shrinkage limit
Plasticity index
1677. Select the correct range of density index, ID
ID > 0
ID < 0
0 < ID < 1
0 < ID < 1
1678. A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the degree of saturation, is
95.4%
95.5%
95.6%
95.7%
1679. If the specific gravity and voids in soil sample are G and e respectively, the hydraulic gradient i, is
(G-1)/(1+e)
(G+1)/(1-e)
(1-G)/(1+e)
(1+G)/(1+e)
1680. A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the void ratio, is
0.858
0.860
0.862
0.864