Top Questions on Soil Mechanics and Foundation Engineering - Civil Engineering Questions and Answers - Section 1-B

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Top Questions on Soil Mechanics and Foundation Engineering

11. If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is:

A) 90° 
B) 45° 
C) 22.5° 
D) 0° 

... Answer : B)
Explanation : 45°

12. If the shearing stress is zero on two planes, then the angle between the two planes is:

A) 45° 
B) 90° 
C) 135° 
D) 225° 

... Answer : B)
Explanation : 90°

13. In the tri-axial compression test, the application of additional axial stress (i.e. Deviator stress) on the soil specimen produces shear stress on:

A) Horizontal plane only
B) Vertical plane only
C) Both horizontal and vertical planes
D) All planes except horizontal and vertical planes

... Answer : D)
Explanation : All planes except horizontal and vertical planes

14. In a triaxial compression test when drainage is allowed during the first stage (i.e. Application of cell pressure) only and not during the second stage (i.e. Application of deviator stress at constant cell pressure), the test is known as:

A) Consolidated drained test
B) Consolidated undrained test
C) Unconsolidated drained test
D) Unconsolidated undrained test

... Answer : B)
Explanation : Consolidated undrained test

15. When a sample of sand is sheared under undrained condition, then

A) Volume of dense sand increases and that of loose sand decreases
B) Volume of dense sand decreases and that of loose sand increases
C) Volume of both dense sand and loose sand decreases
D) Volume does not change

... Answer : D)
Explanation : Volume does not change

16. The ratio of the undisturbed shear strength to the remoulded shear strength in cohesive soil under undrained condition is:

A) Zero
B) 1
C) Greater than 1
D) Between 0 and 1

... Answer : C)
Explanation : Greater than 1

17. 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 increased from 0.07 N/mm2 to 0.15 N/mm2. Slemption’s pore pressure parameter B is:

A) 0.5
B) – 0.5
C) 2.0
D) -2.0

... Answer : A)
Explanation : 0.5

18. Sensitivity of a soil can be defined as

A) Percentage of volume change of soil under saturated condition
B) Ration of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
C) Ration of volume of voids to volume of solids
D) None of the above

... Answer : B)
Explanation : Ration of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

19. Rankine’s theory of earth pressure assumes that the back of the wall is

A) Plane and smooth
B) Plane and rough
C) Vertical and smooth
D) Vertical and rough

... Answer : C)
Explanation : Vertical and smooth

20. The major principal stress in an element of cohesionless soil within the backfill of a retaining wall is

A) Vertical if the soil is in an active state of plastic equilibrium
B) Vertical if the soil is in a passive state of plastic equilibrium
C) Inclined at 45° to the vertical plane  D) None of the above

... Answer : A)
Explanation : Vertical if the soil is in an active state of plastic equilibrium

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