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

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Top Questions on Soil Mechanics and Foundation Engineering

1. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear:

A) Decreases
B) Increases
C) Remains unchanged
D) First increases and then decreases

... Answer : A)
Explanation : Decreases

2. Skempton’s pore pressure coefficient B for saturated soil is:

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

... Answer : A)
Explanation : 1

3. Shear strength of a soil is a unique function of:

A) Effective stress only
B) Total stress only
C) Both effective stress and total stress
D) None of the above

... Answer : A)
Explanation : Effective stress only

4. In a deposit of normally consolidated clay

A) Effective stress increases with depth but water content of soil and undrained strength        decreases with depth
B) Effective stress and water content increase with depth but undrained strength decreases with depth
C) Effective stress and undrained strength increase with depth but water content decreases with depth
D) Effective stress, water content and undrained strength decrease with depth

... Answer : C)
Explanation : Effective stress and undrained strength increase with depth but water content decreases with depth

5. Select the incorrect statement: 

        Effective angle of shearing resistance

A) Increases as the size of particles increases
B) Increases as the gradation in proves
C) Is limited to a maximum value of  45^o
D) Is rarely more than 30^o for fine grained soil 

... Answer : C)
Explanation : Is limited to a maximum value of 45^o

6. Unconfined compressive strength test is

A) Undrained test
B) Drained test
C) Consolidated undrained test
D) Consolidated drained test

... Answer : A)
Explanation : Undrained test

7. A cylindrical specimen of saturated soil failed under an axial vertical stress o 100kN/m2 when it was laterally unconfined. The failure plane was inclined to the horizontal plane at an angle of 45^o. The values of cohesion and angle of internal friction for the soil are respectively:

A) 0.5 N.mm2 and 30^o
B) 0.05 N/mm2 and 0^o 
C) 0.2 N/mm2 and 0^o 
D) 0.05 N/mm2 and 45^o 

... Answer : B)
Explanation : 0.05 N/mm2 and 0^o

8. The angle that Coulomb’s failure envelope makes with the horizontal is called:

A) Cohesion
B) Angle of internal friction
C) Angle of repose
D) None of the above

... Answer : B)
Explanation : Angle of internal friction

9. In a triaxial compression test on a soil specimen, the intermediate. Principal stress is equal to:

A) Major principal stress
B) Minor principal stress
C) Difference between major and minor principal stresses
D) None of the above

... Answer : B)
Explanation : Minor principal stress

10. Select the incorrect statement:

A) In a direct shear box test, the plane of shear failure is predetermined
B) Better control is achieved on the drainage of the soil in a triaxial compression test
C) Stress distribution on the failure plane in the case of triaxial compression test is uniform
D) Unconfined compression test can be carried out on all types of soils.

... Answer : B)
Explanation : Better control is achieved on the drainage of the soil in a triaxial compression test

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