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 k1, k2 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