# 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)

*i*= (

_{c}*G*+ 1)/(1 -

*e*)

- (B)

*i*= (

_{c}*G*+ 1)/(1 +

*e*)

- (C)

*i*= (

_{c}*G*- 1)/(1 +

*e*)

- (D)

*i*= (

_{c}*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**

*W*_{1}and that of container with soil simple is*W*_{2}. If the weight of the container and oven dried soil sample is*W*_{3}, the moisture content of the soil, is- (A) [(

*W*-

_{2}*W*)/(

_{3}*W*-

_{3}*W*)] × 100

_{1}- (B) [(

*W*)/(

_{3 }- W_{2}*W*-

_{1}*W*)] × 100

_{2}- (C) [(

*W*)/(

_{1 }- W_{2}*W*-

_{2}*W*)] × 100

_{3}- (D) [(

*W*)/(

_{2 }- W_{1}*W*-

_{1}*W*)] × 100

_{3}**8. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m**

^{2}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/mm

^{2}and 30°

- (B) 0.05 N/mm

^{2}and 0°

- (C) 0.2 N/mm

^{2}and 0°

- (D) 0.05 N/mm

^{2}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 θ**

_{1}and θ_{2}with the normal to the interface of the soils having permeabilities*k*_{1},*k*_{2}before and after deflection. According to the law of deflection of the flow lines at the interface of the dissimilar soils- (A) sin θ

_{1}/sin θ

_{2}=

*k*

_{1}/

*k*

_{2}

- (B) cos θ

_{1}/cos θ

_{2}=

*k*

_{1}/

*k*

_{2}

- (C) tan θ

_{1}/tan θ

_{2}=

*k*

_{1}/

*k*

_{2}

- (D) tan θ

_{2}/tan θ

_{1}=

*k*

_{1}/

*k*

_{2}

**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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