Important Questions about Foundation & Soil Mechanics -2

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25. Required compaction for soil?

    1. 98 →99 %
    2. 100 →101 %
    3. 94→ 96 %
    4. 92 →94 %

98 →99 % 

26. During percussion drilling:

    1. Ground water observation are hindered due to the entry of the slurry in
    2. below the bottom of the hole
    3. Caving or mixing od strata is caused in soft soils or cohesion less soil
    4. The soil to a considerable depth below the bottom of the hole gets distributed
    5. All of the above

All of the above 

27. For a wall carrying heavy load on low bearing capacity soil

    1. Lean concrete bed is provided
    2. Thick concrete bed is provided
    3. Reinforced concrete bed is provided
    4. (a) & (c) of the above
    5. (b) & (c) of the above

 

(a) & (c) of the above 

28. The bearing capacity of water logged soil, may be improved by

    1. Grouting
    2. Chemical action
    3. Drainage
    4. Compaction

Drainage 

29. Pick up the correct statement from the following:

    1. Isolated footing is provided under column to transfer the load safely to the soil bed
    2. Column footings may have steps or projections in the concrete base
    3. Heavily loaded column base must be provided steel reinforcement in both directions
    4. The concrete offset should be at least 15 cm on all sides
    5. All of the above

All of the above 

30. Which of the following factors are associated with the behavior of sand mass during earthquake to cause liquefaction?

    1. Number of stress cycles
    2. The frequency, and amplitude of vibration of waves generated by an earthquake
    3. Characteristics of sand
    4. Relative density

Select the correct answer using the codes given below :

  1. 1, 2 and 3
  2. 1, 2, 3 and 4
  3. 2 and 4
  4. 3 and 4

1, 2, 3 and 4 

31. What does the confining pressure used in tri-axial compression tests on an undisturbed soil sample represent?

    1. The in-situ total normal stress
    2. The in-situ total lateral stress
    3. The in-situ effective average principal stress
    4. The in-situ shear stress

The in-situ total lateral stress

32. The upstream slope of an earth dam under steady seepage condition is

    1. equipotential line
    2. phreatic line
    3. flow-line
    4. seepage line

Equipotential line 

33. Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?

    1. It is suitable for construction in unstable rocks
    2. In this method, it is easy to install timber support
    3. Tunneling can be continuous and the work can be expedited
    4. In case of excessive water, it is easy to take corrective steps

Tunneling can be continuous and the work can be expedited 

34. A constant angle arch dam when compared to a constant radius arch dam utilizes concrete quantity of about

    1. 33%
    2. 43%
    3. 73%
    4. 143%

                 43%

35. The bearing capacity factors Nc, Nq and Nr are functions of:

    1. width and depth of footing
    2. density of soil
    3. cohesion of soil
    4. angle of internal friction of soil

angle of internal friction of soil 

36. Consider the following factors pertaining to flow through soil:

    1. Hydraulic gradient
    2. Grain size 3. Void ratio
    3. Cross-sectional area of the sample.

Of these, the factors affecting permeability include

  1. 1 and 4
  2. 2 and 3
  3. 1, 2 and 3
  4. 2, 3 and 4

1, 2 and 3 

37. This question about the method for in-situ test of rock?

  1. Coring
  2. Textile
  3. Cutting
  4. Breaking

                  Coring 

38. Clayish

    1. Good for usage in road
    2. Bad for usage in road
    3. Used in road
    4. None of the above

Bad for usage in road

39. Laterite is an

    1. volcanic rock
    2. argillaceous rock
    3. calcareous rock
    4. None of these

volcanic rock 

40. Uplifting of slab on grade will happen because?

    1. Differences of shear at the slab ends
    2. Un balanced moments
    3. Soil resistance
    4. None of these

Soil resistance 

41. In case of Raymond pile:

    1. Lengths vary from 6 m to 12m
    2. Diameter of top of piles varies from 40cm to 60 cm
    3. Diameter of pile at bottom varies from 20 cm to 28 cm
    4. Thickness of outer shell depends upon pile diameter
    5. All of the above

 

All of the above 

42. What is the difference between normally consolidated soils and over consolidated soils?

  1. Normally consolidated soils are saturated and over consolidated soils are unsaturated.
  2. Normally consolidated are suitable for geotechnical work while over consolidated soils are not.
  3. Normally consolidated have been subjected to large stresses in the past while over consolidated soil have not.
  4. Normally consolidated have been subjected to large stresses in the past while over consolidated soil have

Normally consolidated have been subjected to large stresses in the past while over consolidated soil have. 

43. Which of the following statements regarding lateral earth pressure is correct?

  1. The lateral strain required to fully mobilize the soil passive pressure is considerably smaller than the lateral strain required to fully mobilize the soil active pressure.
  2. The lateral strain required to fully mobilize the soil passive pressure is slightly smaller than the lateral strain required to fully mobilize the soil active pressure. 
  3. The lateral strain required to fully mobilize the soil passive pressure is slightly greater than the lateral strain required to fully mobilize the soil active.
  4. The lateral strain required to fully mobilize the soil passive pressure is considerably  greater than the lateral strain required to fully mobilize the soil active pressure

The lateral strain required to fully mobilize the soil passive pressure is slightly  greater than the lateral strain required to fully mobilize the soil active. 

44. Structural fill is required to support a slab-on-grade in an area with a deep frost line. To avoid potential problems with frost heave, the best material for structural fill will be:

  1. Low plasticity cohesive soil compacted by optimum (CL)
  2. Inelastic Silt (ML)
  3. Silty Sand (SM)
  4. Well Graded Sand (SW)

Well Graded Sand (SW) 

45. Mechanism of Secondary compression of clay soil is best described

  1. Secondary Compression is caused by expulsion of air particles due to applied load.
  2. Secondary Compression is caused by water particles due to applied load.
  3. Secondary Compression is caused by rearranging of soil particles due to applied load.
  4. Due to combination of above (a) and (b)

Secondary Compression is caused by water particles due to applied load

46. For construction of a building on soil that predominantly consists of sand and gravel, the best in-situ test is:

  1. Standard Penetration Test
  2. Vane Shear Test
  3. Shear Box Test
  4. Triaxial Test

Standard Penetration Test 

47. What is Proctor Compaction test  

  1. To Check maximum dry Density
  2. To Check Minimum dry Density
  3. To Check normal dry density
  4. To Check High Density

To Check maximum dry Density 

48. The earth pressure that is developed behind a retaining structure depends on the movement of the structure relative to the soil. The active earth pressure developed when:

  1. The structure moves towards the soil
  2. The structure does not move
  3. The structure moves away from the soil
  4. The structure and the soil move away from each other

The structure moves away from the soil 

49. Consolidation is a term used to describe the volume reduction of

    1. Saturated Clay
    2. Dry Clay
    3. Saturated Sand
    4. Fissured Rock

 Saturated Clay 

50. Cohesion less backfill is usually compacted in layers with thickness of

    1. 100cm
    2. 30cm
    3. 50cm
    4. 150cm

              30cm


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