Soil Mechanics Online Test - Paper 3

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Total Questions: 50
Time Allotted: 50 minutes
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1 / 50

1. 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

2 / 50

2. Bleeder wells are required to

a) Increase discharge from the main well

b) Store drainage water

c) Collect seepage water in dams

d) Relieve pressure in impervious layers

3 / 50

3. The rate of consolidation

a) Increases with a decrease in temperature

b) Increases with an increase in temperature

c) Independent of temperature

d) None of the above

4 / 50

4. The change of moisture content of soils changes

a) Angle of repose

b) Cohesive strength

c) Amount of compaction required

d) Any of the above

5 / 50

5. The most suitable method for increasing the bearing capacity of black cotton soil is:

a) Watering the surface of the soil

b) Compacting the soil

c) Replacement of black cotton soil by sand

d) Increasing the depth

6 / 50

6. 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

7 / 50

7. Distribution of earth pressure with depth is:

a) Parabolic

b) Hydrostatic

c) Non-linear but increasing

d) Volume controlled

8 / 50

8. 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.

9 / 50

9. Negative skin friction:

a) Increases the load-carrying capacity of the pile

b) Decreases the load-carrying capacity of the pile

c) Neither increases nor decreases the load-carrying capacity of the pile

d) All of the above

10 / 50

10. Rise of water table in cohesionless soils up to the ground surface reduces the net ultimate bearing capacity approximately by:

a) 90%

b) 80%

c) 50%

d) 40%

11 / 50

11. Consolidation test of a soil sample is carried out to determine:

a) The void ratio in soil

b) The decrease in the total volume

c) The liquid limit of soil

d) The plastic limit of soil

12 / 50

12. The maximum size of a clay particle is

a) 0.1mm

b) 0.3mm

c) 0.002mm

d) 0.005mm

13 / 50

13. Which of the following is responsible for the shear resistance in soils?

a) Intergranular friction

b) Cohesion and adhesion between the soil particles

c) Both (a) and (b) of the above

d) None of the above

14 / 50

14. The maximum pressure which a soil can carry without shear failure is called:

a) Safe bearing capacity

b) Net ultimate bearing capacity

c) Net bearing capacity

d) Ultimate bearing capacity

15 / 50

15. Toe failure is most likely in the case of:

a) Steep slopes

b) Gentle slopes

c) All inclinations

d) Very steep slopes

16 / 50

16. If the failure of a finite slope occurs through the toe, it is known as:

a) Slope failure

b) Base failure

c) Face failure

d) Toe failure

17 / 50

17. If the volume of voids is equal to the volume of solids in a soil, then the values of porosity and voids ratio respectively are

a) 1.0 and 0

b) 0 and 1

c) 0.5 and 1

d) 1 and 0.5

18 / 50

18. Cohesionless soil is

a) Sand

b) Silt

c) Clay

d) Clay and silt

19 / 50

19. A foundation may be classified as deep if:

a) Depth to width ratio is more than 2

b) Depth to width ratio is less than 2

c) Length to width ratio is more than 2

d) Length to width ratio is between 1 and 2

20 / 50

20. Three phase diagram of soil represents

a) Solids, pebbles, and clay

b) Dust, fine sand, and coarse sand

c) Solids, water, and air

d) Solid volume and mass

21 / 50

21. Allowable bearing pressure for a foundation depends on:

a) Allowable settlement only

b) Ultimate bearing capacity of soil only

c) Both allowable settlement & ultimate bearing capacity of soil

d) None of the above

22 / 50

22. Which of the following is not the purpose of a foundation?

a) To distribute the weight of the structure

b) To load the substratum evenly

c) To provide a level surface for building construction

d) To increase the safe bearing capacity of the soil

23 / 50

23. *Earth pressure acting at a height of ..... in case of inclined surcharge is:

a) h/2 from the base of the wall

b) h/3 from the base of the wall

c) h/4 from the base of the wall

d) h/5 from the base of the wall

24 / 50

24. In the modified Proctor test, the drop height of the rammer is

a) 30cm

b) 45cm

c) 60cm

d) 75cm

25 / 50

25. The most effective method for compacting sand is by using

a) Pneumatic rollers

b) Sheep foot rollers

c) Steel tyred rollers

d) Vibration

26 / 50

26. In an earthen dam, the phreatic line is

a) Straight line

b) Circular line

c) Parabolic

d) Zigzag

27 / 50

27. Overturning moment due to the pressure of the soil is 10 KN-m while the resisting moment is 5 KN-m. Find the factor of safety:

a) 2

b) 1

c) 0.5

d) None of the above

28 / 50

28. Agent of transportation for alluvial soils is

a) Water

b) Gravity

c) Wind

d) Ice

29 / 50

29. * The shear resistance between particles is provided by:

a) Terzaghi's

b) Pairwise

c) Adhesive

d) Broken

30 / 50

30. Earth pressure at rest can be defined as lateral pressure exerted by the soil when the retaining wall tends to

a) Move away from the backfill

b) No movement relative to the backfill

c) Move into the soil

d) All of the above

31 / 50

31. Hygroscopic water can be removed by

a) Gravity flow

b) Free flow

c) Heating

d) All of the above

32 / 50

32. If the volume of voids is equal to the volume of solids in a soil mass, then the values of porosity and voids ratio, respectively, are:

a) 1.0 and 0.0

b) 0.0 and 1.0

c) 0.5 and 1.0

d) 1.0 and 0.5

33 / 50

33. The minimum depth of the building foundation in:

a) Sandy soil is 80 cm to 100 cm

b) Clay soils is 90 cm to 160 cm

c) Rocky soils is 5 cm to 50 cm

d) All of the above

34 / 50

34. Most of the shear tests are done in equipment which is:

a) stress controlled

b) strain controlled

c) drainage controlled

d) volume controlled

35 / 50

35. The functional equation for specific gravity (G), water content (w), void ratio (e), and degree of saturation (Sr) is

a) w = SrG / e

b) e = Srw / G

c) e = wG / Sr

d) G = Swr / e

36 / 50

36. The angle between the directions of the failure and the major principal plane is equal to:

a) 90° + effective angle of shearing resistance

b) 90° + half of the angle of shearing resistance

c) 45° + half of the angle of shearing resistance

d) 45° - half of the angle of shearing resistance

37 / 50

37. The bearing capacity factors (N_c, N_q,) and (N_r) are functions of:

a) Cohesion only

b) Angle of internal friction

c) Both (a) and (b) of above

d) None of the above

38 / 50

38. The passive earth pressure of a soil can be defined as lateral pressure exerted by the soil when the retaining wall tends to

a) Move away from the backfill

b) No movement relative to the backfill

c) Move into the soil

d) Any of the above

39 / 50

39. The factor of safety of embankments shall be:

a) At least 1.0

b) At least 1.5

c) At least 2.0

d) At least 2.5

40 / 50

40. One of the graphical methods for earth pressure determination is:

a) Newmark's influence chart method

b) Mohr diagram method

c) Culmann's method

d) Taylor's method

41 / 50

41. The seepage force is proportional to

a) Head loss

b) Flow net

c) Head at upstream

d) Equipotential gradient

42 / 50

42. The position of the backfill lies above a horizontal plane at the elevation of the top of the structure is known as:

a) Surcharge

b) Surcharge angle

c) Extra load

d) Failure load

43 / 50

43. *Coefficient of earth pressure at rest is:

a) Less than active earth pressure but greater than passive earth pressure

b) Greater than active earth pressure but lesser than passive earth pressure

c) Greater than both active and passive earth pressure

d) Lesser than both active and passive earth pressure

44 / 50

44. California Bearing Ratio test is used:

a) To find the bearing capacity of the soil

b) To find the thickness of a flexible pavement

c) To find the ratio of ultimate bearing capacity to net bearing capacity

d) None of the above

45 / 50

45. Which method is quickest to find the water content of soils?

a) Oven dry method

b) Alcohol method

c) Calcium carbide method

d) Sand bath method

46 / 50

46. The bearing capacity of soil depends upon:

a) Shape and size of the particles

b) Cohesive properties of particles

c) Internal frictional resistance of particles

d) All of the above

47 / 50

47. The effective stress in a soil is equal to

a) Force per natural area

b) Force per unit effective area

c) Stress shared by the particles of the soil

d) Stress shared by the pore water

48 / 50

48. Sheet pile walls are used as:

a) Retaining walls for waterfront construction

b) Load-bearing pile foundations

c) Seepage preventing devices

d) Uplift preventing devices

49 / 50

49. The ratio of volume of voids to the total volume of the given soil mass is known as

a) Porosity

b) Void ratio

c) Specific gravity

d) Water content

50 / 50

50. Pile foundations are normally used in:

a) Soft clayey soil

b) Loose sandy soil

c) Heavy loaded situations

d) When required bearing area is not available

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