Foundation Engineering Objective Type Questions - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. The ratio of the weight of water to the weight of solids in a given mass of soil, is known
(A) Porosity
(B) Specific gravity
(C) Void ratio
(D) Water content

2. In a liquid limit test, the moisture content at 10 blows was 70% and that at 100 blows was 20%. The liquid limit of the soil, is
(A) 35 %
(B) 50 %
(C) 65 %
(D) None of these

3. In a purely cohesive soil, the critical centre lies at the intersection of
(A) Perpendicular bisector of slope and the locus of the centre
(B) Perpendicular drawn at 1/3rd slope from toe and the locus of the centre
(C) Perpendicular drawn at 2/3rd slope from toe and the locus of the centre
(D) Directional angles

4. Select the incorrect statement.
(A) Effective cohesion of a soil can never have a negative value
(B) Effective angle of internal friction for coarse grained soils is rarely below 30°
(C) Effective angle of internal friction for a soil increases as state of compactness increases
(D) Effective angle of internal friction is a complicated function of mineralogy and clay size content

5. If ‘G’ is specific gravity of sand particles, ‘e’ is porosity, the critically hydraulic gradient
(A) ic = (G + 1)/(1 - e)
(B) ic = (G + 1)/(1 + e)
(C) ic = (G - 1)/(1 + e)
(D) ic = (G - 1)/(1 - e)

6. The quantity of seepage of water through soils is proportional to
(A) Coefficient of permeability of soil
(B) Total head loss through the soil
(C) Neither (a) nor (b)
(D) Both (a) and (b)

7. The weight of a container is W1 and that of container with soil simple is W2. If the weight of the container and oven dried soil sample is W3, the moisture content of the soil, is
(A) [(W2 - W3)/(W3 - W1)] × 100
(B) [(W3 - W2)/(W1 - W2)] × 100
(C) [(W1 - W2)/(W2 - W3)] × 100
(D) [(W2 - W1)/(W1 - W3)] × 100

8. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°.
The values of cohesion and angle of internal friction for the soil are respectively
(A) 0.5 N/mm2 and 30°
(B) 0.05 N/mm2 and 0°
(C) 0.2 N/mm2 and 0°
(D) 0.05 N/mm2 and 45°

9. The pressure that builds up in pore water due to load increment on the soil, is termed
(A) Excess pore pressure
(B) Excess hydrostatic pressure
(C) Hydrodynamic pressure
(D) All the above

10. A flow line makes angles θ1 and θ2 with the normal to the interface of the soils having permeabilities k1k2 before and after deflection. According to the law of deflection of the flow lines at the interface of the dissimilar soils
(A) sin θ1/sin θ2 = k1/k2
(B) cos θ1/cos θ2 = k1/k2
(C) tan θ1/tan θ2 = k1/k2
(D) tan θ2/tan θ1 = k1/k2

11. The critical exist gradient of seepage water in soils, increases with
(A) An increase in specific gravity
(B) A decrease in specific gravity
(C) A decrease in void ratio
(D) Both (a) and (c)

12. 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

13. The Mohr's straight theory is based on the following fact:
(A) Material fails essentially by shear
(B) Ultimate strength of the material is determined by the stress in the plane of slip
(C) Failure criterion is independent of the intermediate principal stress
(D) All the above

14. According to Coulomb's wedge theory, the active earth pressure slides the wedge
(A) Down and outwards on a slip surface
(B) Up and inwards on a slip surface
(C) Horizontal upward and parallel to base
(D) Horizontal inward and parallel to base

15. Pile foundations are generally preferred to for
(A) Bridge foundations
(B) Sky scrapper buildings
(C) Residential buildings
(D) Runways

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