MCQ Competitive Exam Questions Civil Soil Mechanics - Set 21 - ObjectiveBooks

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 ) 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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