MCQ
1. Pick up the correct statement from the following:
Isotropic consolidation of clay can be obtained in the triaxial apparatus under equal allround pressure
If the present effective stress is the maximum to which the clay has ever been subjected, it is called normally consolidated clay
If the present effective stress in the past was more than present effective stress, it is called over-consolidated clay
All the above
2. Chemical weathering of soil is caused due to
Oxidation
Carbonation
Hydration
All the above
3. A suspended particle falls through a height minutes. If the viscosity of water is and specific gravity of the particle is, the diameter of the particle is (where M is a constant factor)
103M (H/t)
104M (H/t)
105M (H/t)
102M (H/t)
4. Terzaghi's analysis assumes:
Soil is homogeneous and isotropic
Elastic zone has straight boundaries inclined at = to the horizontal and plastic zones fully developed
Failure zones do not extend above the horizontal plane through the base of the footing
All the above
5. The specific gravity of Calcite is
2.65
2.72
2.85
2.90
6. The length/diameter ratio of cylindrical specimens used in triaxial test, is generally
1
1.5
2
2.5
7. The seepage exit gradient in a soil is the ratio of
Total head to the length of seepage
Flow line to slope
Head upstream to that at downstream
Head loss to the length of the seepage
8. The ultimate bearing capacity of a soil, is
Total load on the bearing area
Safe load on the bearing area
Load at which soil fails
Load at which soil consolidates
9. If the bulk density of the soil is and water content, then dry density of the soil, is
1+/
(1+)/
/(1+)
/(1+)
10. The clay mineral with the largest swelling and shrinkage characteristics is
Kaolinite
Illite
Montmorillonite
None of the above
11. If the shearing stress is zero on two planes, then the angle between the two planes is
45"
90°
135°
225"
12. Select the correct statement.
Coefficient of compressibility of an over- consolidated clay is less than that of a normally consolidated clay
Coefficient of compressibility of an over- consolidated clay is greater than that of a normally consolidated clay
Coefficient of compressibility is constant for any clay
None of the above
13. The minimum depth of building foundations on
Sandy soils is 80 cm to 100 cm
Clay soils is 90 cm to 160 cm
Rocky soils is 5 cm to 50 cm
All the above
14. 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
15. 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)
16. Which of the following methods is more suitable for the determination of permeability of clayey soil?
Constant head method
Falling head method
Horizontal permeability test
None of the above
17. For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
Dry of OMC and wet of OMC
Wet of OMC and dry of OMC
) Wet of OMC and wet of OMC
Dry of OMC and dry of OMC where OMC is optimum
18. 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
19. Compression of soil occurs rapidly if voids are filled with
Air
Water
Partly with air and partly with water
None of these
20. The maximum load carried by a pile, when it continues to sink without further increase of load, is known as
Ultimate load carrying capacity
Ultimate bearing capacity
Ultimate bearing resistant
All the above