1. For purely cohesive soil, Nc has a maximum value of ___________ for square footing.
a) 5
b) 7.5
c) 9
d) 10
Explanation: According to Skempton’s observation, for purely cohesive soil (φ = 0) Nc has a maximum value of 9 for square or circular footing.
2. The Brinch Hansen shape factor can be applied to ___________ for the case of rectangular footing.
a) Skempton value of Nc
b) Terzaghi’s equation
c) Meyerhof’s equation
d) None of the mentioned
Explanation: The Brinch Hansen shape factor can be applied to the Nc values from Skempton for the rectangular footing.
3.Hansen considered the bearing capacity as a ____________
a) Tri axial problem
b) Base factor
c) Plane-strain problem
d) All of the mentioned
Explanation: Brinch Hansen considered the bearing capacity as a plane-strain problem. If φ is found by tri axial test, its corresponding value for the plane strain case can be computed.
4. Bowel suggested that the increase in φ in plane-strain case can be computed only for φ greater than ____________
a) 30
b) 25
c) 60
d) 90
Explanation: Bowel suggests that the increase of φ in the equation φ plain strain = 1.1 φ tri axial can be computed only for φ greater than 25°
5. Skempton observed that the factor Nc increases with the ratio ___________
a) D/B
b) B/D
c) H/Hc
d) c/cm
Explanation: Based partly on theory and partly on the laboratory test, Skempton observed that the factor Nc increases with the ratio D/B.
6. When D=0, the value of Nc for strip footing will be ____________
a) 6.20
b) 2.5
c) 5.14
d) 7.5
Explanation: According to Skempton recommendation, the value of Nc = 5.14 for strip footing when D=0 and Nc = 6.20 for square or circular footing.
7. Which of the following value can be taken [Nc] surface for surface footing?
a) 6
b) 5
c) 2.1
d) 9
Explanation: Value of [Nc] surface may be roughly taken as 5 for surface strip footing and as 6 for square or circular footing
8. The term ‘i’ in Hansen equation represents ___________
a) Depth factor
b) Shape factor
c) Ground factor
d) Inclination factor
Explanation: According to Brinch Hansen’s equation, i represent the inclination factor to account for both horizontal and vertical components of foundation loads.
9. When the water table is above the base of the footing, the submerged weight ‘γ’ can be used to compute __________
a) Effective pressure and Surcharge
b) Pore pressure
c) None of the mentioned
d) All of the mentioned
Explanation: When the water table is above the base of the footing, the submerged weight ‘γ’ should be used for the soil below the water table for computing the effective pressure or the surcharge.
10. Which of the following is an essential difference between Vesic’s and Hansen’s procedure?
a) Different values of Nγ and Variation on some of Hansen inclination
b) Different value of Nq and Nc
c) None of the mentioned
d) All of the mentioned
Explanation: The essential difference in Vesic’s and Hansen’s procedure are i) use of slightly different values of Ny and ii) a variation on some of Hansen’s inclination, base and ground factors.