1. The equation Nc = (Nq – 1) cot φ, have been adopted by ___________
a) Terzaghi and Peck
b) Hansen
c) Vesic
d) All of the mentioned
Explanation: The two equations Nc = (Nq – 1) cot φ and Nq = tan2 (45 + φ/2) ex tan φ have been adopted by i) Terzaghi and Peck ii) Hansen iii) Vesic iv) Meyerhof and Bureau of Indian standards.
2. Which of the following N factors has the widest range of values?
a) Nc
b) Nq
c) Nγ
d) All of the mentioned
Explanation: The Nγ factor has the widest suggested range of any value of N factors. A literature value reveals that for φ = 40°, 38≤ Nγ≤192.
3. Which of the following term does not contribute to q f?
a) Nc
b) Nγ
c) Nq
d) All of the mentioned
Explanation: The Nγ term does not contribute significantly to qf so that almost any reasonable value can be used. Bureau of Indian standards (BIS) recommends using the value of Nγ, given by Vesic.
4. Meyerhof’s extended the analysis of plastic equilibrium of a surface footing to __________
a) Shallow foundation and Deep foundation
b) Inclined foundation
c) None of the mentioned
d) All of the mentioned
Explanation: Meyerhof’s extended the analysis of plastic equilibrium of a surface footing to Shallow and Deep foundation according to both Terzaghi and Meyerhof analysis.
5. In the Bowl’s method for finding the effect of water table, which of the following factor is used for soil in the wedge zone?
a) Water reduction factor
b) Effective unit weight
c) Overburden pressure
d) Average unit weight
Explanation: In the third method (Bowles, 1988), no water reduction factor is used, but effective unit weight (γe) is used for the soil in the wedge zone.
6. Which of the following equation has been recommended by Indian standard for finding reduction factor in water table?
a) R w = 0.5 (1 + z w2/B)
b) R w = (1 + z w2/B)
c) R w = c Nc + σ̅. Nq + 0.5γBNγ
d) R w = z w2 / B
Explanation: Rw = 0.5 (1 + z w2 / B) has been recommended by Indian standard at a depth D1 below the ground level.
7. The value of Nc and Nq are same for, which of the following methods?
a) Meyerhof
b) Hansen
c) Vesic
d) All of the mentioned
Explanation: The value of Nc and Nq are same for Meyerhof, Hansen and Vesic method, while subscripts for Nγ identify the author, i.e. N γ(H) = valued by Hansen etc.
8. The factor N γ(M) identifies which of the following author?
a) Vesic
b) Meyerhof
c) Hansen
d) Terzaghi
Explanation: The factor N γ(M) gives values by Meyerhof, as it has the subscript (M) in it.
9. IS code recommends a bearing capacity equation, which is similar to __________
a) Vesic
b) Meyerhof and Brinch Hansen
c) None of the mentioned
d) All of the mentioned
Explanation: IS code (IS : 6403-1981) recommends a bearing capacity equation which is similar in nature to those given by Meyerhof and Brinch Hasen
10. According to IS code, there are __________ types of failures of soil support beneath the foundation.
a) 2
b) 4
c) 3
d) 5
Explanation: The code recognizes, depending upon the deformation associated with the load and the extent of development of failure surface, three types of failures of soil support beneath the foundations which are general, local and punching shear failure.