### Civil Engineering - Soil Mechanics and Foundation Engineering MCQs Part 6

1. Pick up the cohesive soil from the following:

A.
Red earth
B.
Clay
C.
Black cotton soil
D.
Compacted ground.

2. Pile foundations are generally preferred to for

A.
bridge foundations
B.
sky scrapper buildings
C.
residential buildings
D.
runways.

3. The angle of internal friction of clays, is usually

A.
0° to 5°
B.
5° to 20°
C.
20° to 30°
D.
30° to 45°

4. If the bulk density of the soil is ρ and water content ω, then dry density of the soil, is

A.
B.
C.
D.

5. The specific yield of soil depends upon

A.
compaction of stratum
B.
distribution of pores
C.
shape and size of particles
D.
all the above.

6. The area of cross-section A at failure or during any stage of Triaxial Compression Test and its initial length (L) and volume (V), are related by the equation

A.
B.
C.
D.

7. Pick up the correct statement from the following:

A. In hydrometer method, weight Wd per ml of suspension is found directly
B. In pipette analysis, weight Wd per ml of suspension is found indirectly
C. In pipette analysis, weight Wd per ml of suspension is found directly
D. None of these.

8. Pick up the correct statement from the following:

A. Coefficient of compressibility is the decrease in void ratio per unit increase of pressure
B. The percent settlement at any time is called degree of consolidation
C. Time factor is a dimensionless quantity
E. All the above.

9. 'Loess' is silty clay formed by the action of

A. water
B. glacier
C. wind
D. gravitational force.

10. The maximum possible value nf dry density is referred to as

A. dry density
B. zero air voids
C. saturation dry density
D. all the above.

11. Failure of a slope occurs only when total shear force is

A. equal to total shearing strength
B. greater than total shearing strength
C. less than total shearing strength
D. none of these.

12. Pick up the correct statement from the following:

A. A soil having pH value more than 7 is an acidic soil
B. A soil having pH value less than 7 is an acidic soil
C. A soil having pH value more than 7 is an alkaline soil
D. A soil containing chemicals for the manufacture of portland cement is preferred.

13. Cohesionless soil is

A. sand
B. silt
C. clay
D. clay and silt.

14. The shearing force acting along the slice of a curved surface of slippage, causes the soil to slide

A. down at the centre
B. down at the toe
C. upward at the centre
D. none of these.

15. The seepage exit gradient in a soil is the ratio of

A. total head to the length of seepage
B. flow line to slope
C. head upstream to that at downstream
D. head loss to the length of the seepage
E. none of these.

16. Sedimentation analysis is based on the assumption:

A. soil particles are spherical
B. particles settle independent of other particles
C. walls of the jar do not affect the settlement .
D. all the above.

17. The maximum pressure which a soil can carry without shear failure, is called

A. safe bearing capacity
B. net safe bearing capacity
C. net ultimate bearing capacity
D. ultimate bearing capacity.

18. For general engineering purposes, soils are classified by

A. particle size classification system
B. textural classification system
C. High Way Research Board (HRB), classification system
D. unified soil classification system.

19. If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow :

A. a straight line
B. a parabola
C. a semi-ellipse
D. a semi-circle.

20. The change of moisture content of soils, changes the

A. value of the angle of repose
B. amount of compaction required
C. cohesive strength of soil
D. all the above.

21. A failure wedge develops if a retaining wall

A. moves away from the backfill
B. moves towards the backfill
C. sinks downwards
D. stresses equally by vertical and horizontal forces.

22. For determining the ultimate bearing capacity of soil, the recommended size of a square bearing plate to be used in load plate test should be 30 to 75 cm square with a minimum thickness of

A. 5 mm
B. 10 mm
C. 15 mm
D. 20 mm
E. 25 mm

23. The water content in a soil sample when it continues to loose weight without loosing the volume, is called

A. Shrinkage limit
B. Plastic limit
C. liquid limit
D. semi-solid limit.

24. The intensity of vertical pressure at a depth Z directly below the point load Q on its axis of loading is :

A.
B.
C.
D.

25. When a cohesionless soil attains quick condition, it looses

A. shear strength
B. bearing capacity
C. both (a) and (b)
D. neither (a) nor (6).

26. Pick up the correct definition from the following:

A. The lateral pressure exerted by the soil when the retaining wall moves away from the back fill, is generally known as active earth pressure of the soil
B. The lateral pressure exerted by the soil when the retaining wail moves towards the soil, is generally known as 'Passive earth pressure of the soil'
C. The lateral pressure exerted by the soil when the retaining wall has no movement relative to the back fill, is known as 'earth pressure at rest of the soil'
D. All the above.

6. The area of cross-section A at failure or during any stage of Triaxial Compression Test and its initial length (L) and volume (V), are related by the equation

A.
B.
C.
D.

7. Pick up the correct statement from the following:

A. In hydrometer method, weight Wd per ml of suspension is found directly
B. In pipette analysis, weight Wd per ml of suspension is found indirectly
C. In pipette analysis, weight Wd per ml of suspension is found directly
D. None of these.

8. Pick up the correct statement from the following:

A. Coefficient of compressibility is the decrease in void ratio per unit increase of pressure
B. The percent settlement at any time is called degree of consolidation
C. Time factor is a dimensionless quantity
E. All the above.

9. 'Loess' is silty clay formed by the action of

A. water
B. glacier
C. wind
D. gravitational force.

10. The maximum possible value nf dry density is referred to as

A. dry density
B. zero air voids
C. saturation dry density
D. all the above.