Soil Mechanics Online Test - Paper 2

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
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1 / 30

1. The bearing capacity of a weak soil may be improved by:

a) Increasing the depth of the foundation

b) Compacting the soil by ramming

c) Removing the poor soil and filling the gap with sand, gravel, etc.

d) All of the above

2 / 30

2. If the coefficient of passive earth pressure k is 1/3 then the coefficient of active earth pressure is:

a) 1/3

b) 1

c) 3

d) 3/2

3 / 30

3. * For a properly designed footing, the bearing stress must be less than the bearing capacity, which is the bearing stress that causes a ......... failure within the foundation soil.

a) Tensile

b) Expected

c) Unexpected

d) Shear

4 / 30

4. Specific gravity of soil is

a) Same for clays and sands

b) Determined by hydrometer

c) Less than 2.0 for most soils

d) More than 2.5 for most soils

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5. Number of blows required to penetrate the sampler & cone for a depth of ...&... is known as penetration number

a) 30cm & 20cm

b) 20cm & 30cm

c) 40cm & 50cm

d) 50cm & 40cm

6 / 30

6. The assumption of Coulomb's theory is:

a) Backfill is dry, homogeneous, isotropic, and cohesionless

b) Rupture plane is linear and passes through the toe of the wall

c) Sliding wedge acts as a rigid body, and the value of earth pressure is obtained by considering the equilibrium of the wedge

d) All of the above

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7. Uniformity coefficient of a soil is:

a) always less than 1

b) always equal to 1

c) equal to or less than 1

d) equal or greater than 1

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8. Cohesive soils are generally/normally

a) Plastic and also compressible

b) Elastic and also compressible

c) Plastic but incompressible

d) None of the above

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9. The void ratio of soil is

a) The ratio of voids to solids in volume

b) The ratio of voids to gross volume

c) The ratio of solids to voids in volume

d) The ratio of solid volume to gross volume

10 / 30

10. The critical height in the stability of the soil is the:

a) Maximum height at which the stability of the slope is possible

b) Minimum height at which the stability of the slope is possible

c) Maximum vertical height of the soil in an open excavation

d) None of the above

11 / 30

11. Void ratio, e, of a soil can

a) Never be greater than one

b) Be equal to zero

c) Be greater than zero

d) Be between 0 and 1

12 / 30

12. The ratio of the unit weight of soil solids to that of water is called:

a) Void ratio

b) Porosity

c) Specific gravity

d) Degree of saturation

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13. The ultimate B.C. of a soil can be defined as:

a) Ultimate load on the bearing area

b) Safe load on the bearing area

c) Load at which the soil fails

d) Load beyond which the soil should not be loaded

14 / 30

14. The minimum net pressure intensity causing shear failure of the soil is called:

a) Safe bearing capacity

b) Net ultimate bearing capacity

c) Net bearing capacity

d) Ultimate bearing capacity

15 / 30

15. The failure plane

a) Carries maximum shear stress

b) Does not carry maximum shear stress

c) Carries minimum shear stress

d) None of the above

16 / 30

16. The seepage flow through a porous medium is generally

a) Turbulent

b) Supercritical

c) Transitional

d) Laminar

17 / 30

17. The lateral earth pressure of the soil moves towards the retaining wall indicates

a) Active earth pressure

b) Passive earth pressure

c) Constant

d) All of the above

18 / 30

18. Saturated soil is concerned with

a) Two-phase system

b) Three-phase system

c) One-phase system

d) All of the above

19 / 30

19. Which of the following soils has the largest permeability?

a) Sand

b) Gravel

c) Silt

d) Clay

20 / 30

20. The difference between total pressure and pore water pressure is known as

a) Major principal stress

b) Minor principal stress

c) Effective stress

d) None of the above

21 / 30

21. The difference between the undisturbed shear strength and remoulded shear strength is known as

a) Thixotropy

b) Dilatancy

c) Remoulding less

d) Degree of sensitivity

22 / 30

22. The seepage force is proportional to

a) Exit gradient

b) Head of water at upstream

c) Head of water at downstream

d) None of the above

23 / 30

23. If the shearing stress is zero on two planes, then the angle between the two planes is

a) 45°

b) 90°

c) 135°

d) 180°

24 / 30

24. The value of net allowable bearing pressure is:

a) Net safe bearing capacity

b) Net safe settlement pressure

c) Minimum of net safe bearing capacity and net safe settlement pressure

d) Gross safe bearing capacity

25 / 30

25. A fully saturated soil is called

a) One phase system

b) Two phase system with soil and air

c) Two phase system with soil and water

d) Three phase system

26 / 30

26. Specific gravity of solid particles is determined in a laboratory with:

a) Shrinkage Limit Method

b) Gas Jar Method

c) Density Bottle Method

d) All of the above

27 / 30

27. The critical exit gradient of the seepage of water in a soil is

a) (1-e) / (G-1)

b) (G+e) / (1+e)

c) (G-1)/(1+e)

d) None of the above

28 / 30

28. Negative skin friction affects the load carrying capacity of the pile by:

a) Increases

b) Decreases

c) Constant

d) None of the above

29 / 30

29. Weathering of soils is caused by

a) Periodical temperature changes

b) Impact and splitting action of flowing water

c) Impact and splitting action of plants and animals

d) All of the above

30 / 30

30. A clay deposit subjected to pressure in the past which is more than the present overburden pressure is known as

a) Normally consolidated soil

b) Overconsolidated soil

c) Underconsolidated soil

d) None of the above.

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Soil Mechanics Online Test – Paper 2

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