MCQ
1641. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing
Cohesion and effective angle of shearing resistance
Cohesion and effective unit weight of soil
Effective unit weight of soil and effective angle of shearing resistance
Effective angle of shearing resistance
1642. For general engineering purposes, soils are classified by
Particle size classification system
Textural classification system
High Way Research Board (HRB), classification system
Unified soil classification system
1643. Select the correct range of density index, ID
ID > 0
ID < 0
0 < ID < 1
0 < ID < 1
1644. Pick up the correct statement from the following:
A soil having pH value less than 7 is an acidic soil
A soil having pH value more than 7 is an acidic soil
A soil containing chemicals for the manufacture of Portland cement is preferred
A soil having pH value more than 7 is an alkaline soil
1645. 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
1646. According to Coulomb's wedge theory, the active earth pressure slides the wedge
Down and outwards on a slip surface
Up and inwards on a slip surface
Horizontal upward and parallel to base
Horizontal inward and
1647. On wetting, cohesive soils,
Loose permeability
Gain shear strength
Loose elasticity
Decrease their shear strength
1648. The Mohr's straight theory is based on the following fact:
Material fails essentially by shear
Ultimate strength of the material is determined by the stress in the plane of slip
Failure criterion is independent of the intermediate principal stress
All the above
1649. The phreatic line in an earth dam may be
Circular
Elliptical
Parabolic
A straight line
1650. 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
1651. The plasticity of fine soils may be assessed by means of
Dry strength test
Toughness test
Dilatancy test
All of these
1652. 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
1653. A soil mass is said to be in plastic equilibrium if
It is stressed to maximum
It is on the verge of failure
It is in plastic stage
It starts flowing
1654. Pile foundations are generally preferred to for
Bridge foundations
Sky scrapper buildings
Residential buildings
Runways
1655. Stoke's law states that the velocity at which a grain settles out of suspension, the other factors remaining constant, is dependent upon
Shape of grain
Weight of grain
Size of grain
Shape, size and weight of grain
1656. 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%
1657. Contact pressure beneath a rigid footing resting on cohesive soil is
Less at edges compared to middle
More at edges compared to middle
Uniform throughout
None of the above
1658. Pick up the correct statement from the following:
Sandy clayloam contains highest percentage of sand
Silty clayloam contains highest percentage of silt
Stiff boulder clay offers maximum shear strength
Soft chalk carries least safe load
1659. Through a point in a loaded soil mass, there exists typical planes mutually orthogonal on which the stress is wholly normal and no shear stress acts, if is
1
2
3
4
1660. Water content of soil can
Never be greater than 100%
Take values only from 0% to 100%
Be less than 0%
Be greater than 100%