Practice Test: Question Set - 21
1. The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively
- (A) Zero and zero
- (B) 0.5 kg/cm2 and zero
- (C) 0.5 kg/cm2 and 0.5 kg/cm2
- (D) 1.0 kg/cm2 and 0.5 kg/cm2
2. Pick up the in-correct statement from the following: The soils which contain montmorillonite minerals
- (A) Swell more
when wet
- (B) Shrink more
when dry
- (C) Possess high
plasticity
- (D) Possess
high coefficient of internal coefficient
3. Time factor for a clay layer is
- (A) A dimensional parameter
- (B) Directly proportional to permeability of soil
- (C) Inversely proportional to drainage path
- (D) Independent of thickness of clay layer
4. The critical exist gradient of seepage water in soils, is
- (A) Directly
proportional to the voids ratio
- (B) Inversely
proportional to the specific gravity
- (C) Directly
proportional to the specific gravity
- (D) None of
these
5. In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on
- (A) Horizontal plane only
- (B) Vertical plane only
- (C) Both horizontal and vertical planes
- (D) All planes except horizontal and vertical planes
6. For a clay slope of height of 10 m, the stability number is 0.05, γ = 2.0 t/m3, C = 2.5 t/m2, the critical height of the slope of the soil, is
- (A) 4.0
m
- (B) 12.5
m
- (C) 25.0 m
- (D) 15.0 m
7. Allowable bearing pressure for a foundation depends upon
- (A) Allowable settlement only
- (B) Ultimate bearing capacity of soil only
- (C) Both allowable settlement and ultimate bearing
capacity
- (D) None of above
8. Pick up the correct statement from the following:
- (A) The
property of a soil that enables it to become stiff in a relatively short time
on standing is called thixotropy
- (B) The ratio of
shear strength in natural state to the remoulded shear strength under undrained
conditions is called degree of
sensitivity
- (C) The
difference between the undisturbed shear strength and remoulded shear strength
is known remoulding loss
- (D) All the
above
9. Voids ratio of a soil mass can
- (A) Never be greater than unity
- (B) Be zero
- (C) Take any value greater than zero
- (D) Take values between 0 and 1 only
10. If the cohesive force (c), is 1.5 t/m2, the density (γ) of the soil is 2.0 t/m3, factor of safety (F) is 1.5 and stability factor (Sn) is 0.05, the safe height of a slope, is
- (A) 5 metres
- (B) 8 metres
- (C) 10 metres
- (D) 12 metres
11. If the plasticity index of a soil mass is zero, the soil is
- (A) Sand
- (B) Silt
- (C) Clay
- (D) Clayey silt
12. Coulomb's wedge theory assumes that
- (A) Back
fill is dry, cohesionless, homogeneous and isotropic
- (B) Slip surface
is the plane which passes through the heel of the wall
- (C) Position
and direction of the resultant earth pressure are known
- (D) All
the above
13. Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability
- (A) Increases by 25 %
- (B) Increases by 50 %
- (C) Increases by 33.3 %
- (D) Decreases by 33.3 %
14. Transporting and re-depositing soils, is done by
- (A) Water
- (B) Glacier
- (C) Gravity
- (D) All the
above
15. For a loose sand sample and a dense sand sample consolidated to the same effective stress
- (A) Ultimate strength is same and also peak strength is
same
- (B) Ultimate strength is different but peak strength is
same
- (C) Ultimate strength is same but peak strength of
dense sand is greater than that of loose sand
- (D) Ultimate strength is same but peak
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