Soil Mechanics and Foundation Engineering problems
- 1. An infinite slope is inclined at angle i and has its angle of internal friction ?, the stability number Sa, is
Options- A.
- B.
- C. (tan i - tan ?) cos2 i
- D. (tan i - tan ?) sin2 i Discuss
Correct Answer: (tan i - tan ?) cos2 i
- 2. Pick up the correct statement from the following:
Options- A. The phenomenon of quicksand generally occurs in the cohesionless soil
- B. At critical hydraulic gradient, the saturated sand becomes quick
- C. The critical gradient depends on the void ratio and the specific gravity
- D. The quick sand occurs more in fine sand and silt than coarse material
- E. All the above. Discuss
Correct Answer: All the above.
- 3. If the unit weight of sand particles is 2.696 g/cc. and porosity in loose state is 44%, the critical hydraulic gradient for quick sand condition, is
Options- A. 0.91
- B. 0.92
- C. 0.93
- D. 0.94
- E. 0.95 Discuss
Correct Answer: 0.95
- 4. Darcy's law is applicable to seepage if a soil is
Options- A. homogeneous
- B. isotropic
- C. incompressible
- D. all the above. Discuss
Correct Answer: all the above.
- 5. Through a point in a loaded soil, the principal stress is maximum on
Options- A. minor principal plane
- B. intermediate principal plane
- C. major principal plane
- D. none of these. Discuss
Correct Answer: major principal plane
- 6. Terzaghi's analysis assumes :
Options- A. soil is homogeneous and isotropic
- B. elastic zone has straight boundaries inclined at ? = ? to the horizontal and plastic zones fully developed
- C. failure zones do not extend above the horizontal plane through the base of the footing
- D. all the above. Discuss
Correct Answer: all the above.
- 7. If the coefficients of volume change and compressibility of a soil sample are respectively 6.75 x 10-2 and 3 x 10-2, the void ratio of the soil sample, is
Options- A. 1.10
- B. 1.15
- C. 1.20
- D. 1.25
- E. 1.30 Discuss
Correct Answer: 1.25
Explanation:
Coeff.compressibility = Coeff.volume change/(1 + e).
(1 + e) = Coeff.volume change/Coeff.compressibility.
e = (Coeff.volume change/Coeff.compressibility) - 1.
e = ((6.75 x 10-2)/(3 x 10-2)) - 1.
e = 2.25 - 1.
e = 1.25.
- 8. The passive earth pressure of a soil, is proportional to (where ? is the angle of internal friction of the soil.)
Options- A. tan (45° - ?)
- B. tan (45° + ?)
- C. tan2 (45° - ?
- D. tan2 (45° + ?) Discuss
Correct Answer: tan2 (45° + ?)
- 9. Flow net is used for the determination of
Options- A. quantity of seepage
- B. hydrostatic pressure
- C. seepage pressure
- D. exit gradient
- E. all the above. Discuss
Correct Answer: all the above.
- 10. The coefficient of curvature for a well graded soil, must be between
Options- A. 0.5 to 1.0
- B. 1.0 to 3.0
- C. 3.0 to 4.0
- D. 4.0 to 5.0 Discuss
Correct Answer: 1.0 to 3.0
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