Soil Mechanics and Foundations MCQ Civil Engineering

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About Soil Mechanics and Foundations

Soil Mechanics And Foundations: Everything You Need to Know

Soil mechanics and foundations are two of the most important aspects of any construction project. If you are unfamiliar with these concepts, don't worry! In this blog post, we will discuss everything you need to know about soil mechanics and foundations. We will start by explaining what soil mechanics is, and then we will move on to discussing foundations.

Soil mechanics is the study of the behavior of soils under different conditions. Soils are composed of particles of different sizes, and they can be either natural or man-made. Soil mechanics aims to understand how these particles interact with each other, and how they respond to different loads and stresses.

Foundations are structures that transfer loads from a structure to the ground. The type of foundation you will need will depend on the type of soil you are working with. There are four main types of foundations: shallow foundations, deep foundations, raft foundations, and pile foundations.

Shallow foundations are typically used for small structures, such as houses. They are not suitable for large structures because they cannot support the weight of the structure. Deep foundations are used for large structures, such as skyscrapers. They are placed deep into the ground, and they can support a lot of weight.

Final Verdict

Soil mechanics and foundations are two of the most important aspects of any construction project. If you are unfamiliar with these concepts, don't worry! In this blog post, we have discussed everything you need to know about soil mechanics and foundations.

Following are some of the multiple choice questions on the Soil Mechanics and Foundations with answers that will help the students in developing their knowledge.

Soil Mechanics and Foundations MCQ

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

  • slope failure
  • face failure
  • base failure
  • toe failure.

2. Theoretically, the void ratio in soils can have the following values, which is

  • less than one only.
  • more than one.
  • can be less or more than one.
  • less than 0.5

3. The liquidity index is defined as a ratio expressed as percentage of

  • plastic limit minus the natural water content, to its plasticity index
  • natural water content minus its plastic limit to its plasticity index
  • natural water content plus its plastic limit to its plasticity index
  • liquid limit minus the natural water content to the plasticity index.

4. The lateral earth pressure on a retaining wall

  • is equal to mass of the soil retained
  • proportional to the depth of the soil
  • proportional to the square of the depth of the soil
  • proportional to the internal friction of the soil

5. The ultimate consolidation settlement of a soil is

  • directly proportional to the voids ratio
  • directly proportional to the compression index
  • inversely proportional to the compression index
  • none of the above

6. Which one of the following clays behaves like a dense sand ?

  • over-consolidated ciay with a high over-consolidation ratio
  • over-consolidated clay with a low over-consolidation ratio
  • normally consolidated clay
  • under-consolidated clay

7. The lateral earth pressure on a retaining wall is proportional to

  • The depth of the soil
  • The soil retained
  • The internal friction of the soil
  • The square of the depth of the soil

8. The coefficient of compressibility of soil, is the ratio of

  • stress to strain
  • strain to stress
  • stress to settlement
  • rate of loading to that of settlement.

9. A soil has bulk density 2.30 g/cm3 and water content 15 per cent, the dry density of the sample, is

  • 1.0 g/cm2
  • 1.5 g/cm3
  • 2.0 g/cm3
  • 2.5 g/cm3

10. When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as

  • negative
  • zero
  • non-plastic (NP)
  • 1

11. The ratio of the weight of given volume of soil solids to the weight of an equal volume of distilled water at the given temperature, is known

  • porosity
  • specific gravity
  • void ratio
  • water content.

12. Geologic cycle for the formation of soil, is

  • Upheavel → transportation → deposition → weathering
  • Weathering → upheaval → transportation → deposition
  • Transportation → upheaval → weathering → deposition
  • Weathering → transportation → deposition → upheaval

13. Which of the following soil has the finest grains?

  • Silt
  • Clay
  • Fine sand
  • Coarse sand

14. The angle of internal friction is maximum for

  • Round-grained dense sand
  • Round-grained loose sand
  • Angular-grained dense sand
  • None of the above

15. A decrease in water content results in a reduction of the volume of a soil in

  • Liquid state
  • Semi solid state
  • Plastic state
  • All of these

16. The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known

  • liquid limit
  • plastic limit
  • shrinkage limit
  • permeability limit.

17. Which one of the following statements is true ?

  • Clays are more porous than sands
  • Pressure of organic matter in a soil decreases the bearing capacity of the soil
  • Aluminous cement is used for foundations in soils with chemical deposits
  • All the above.

18. When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as

  • quick test
  • drained test
  • consolidated undrained test
  • none of these.

19. According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

  • 0
  • 7
  • 17
  • PI>27

20. The ratio of volume of voids to the total volume of soil mass is called

  • air content
  • porosity
  • percentage air voids
  • voids ratio

21. Which of the following is a measure of particle size range ?

  • effective size
  • uniformity coefficient
  • coefficient of curvature
  • none of the above

22. Soils containing organic matters are of spongy nature.

  • True
  • False

23. The specific gravity of sand is approximately ........

  • 2.0
  • 2.6
  • 2.4
  • None of the above

24. Pile foundations are generally preferred to for ..........

  • Runways
  • Bridge foundations
  • Residential buildings
  • Sky scrapper buildings

25. The method of the slices is applicable to

  • Saturated soils
  • stratified soils
  • Homogenous soils
  • None of the above

26. Under reamed piles are generally used for ..............

  • Bored piles
  • Driven piles
  • Precast piles
  • None of the above

27. Hydrometer readings are corrected for:

  • Meniscus correction
  • Dispersing agent correction
  • Meniscus and dispersing agent corrections
  • Temperature, meniscus and dispersing agent corrections

28. Chemical weathering of soil is caused due to ..........

  • Leaching
  • Hydration
  • Oxidation
  • All of the above

29. Talus soil is transported by ............

  • Wind
  • Water
  • Glacier
  • Gravitational force

30. Water formed transported soil is

  • Loess
  • Marine
  • Alluvial
  • Lacustrine

31. The weight of a pycnometer containing 400 g sand and water full to the top is 2150 g. The weight of pycnometer full of clean water is 1950 g. If specific gravity of the soil is 2.5, the water content is

  • 5%
  • 10%
  • 15%
  • 20%

32. Failure of the stability of slopes, generally occurs along

  • slip plane
  • a horizontal surface
  • a curved surface
  • all the surfaces.

33. The relationship between void ratio (e) and porosity ratio (n) is :

  • n =
  • e =
  • n =
  • e = n/(1 - n)

34. A coarse-grained soil has a voids ratio 0.75, and specific gravity as 2.75. The critical gradient at which quick sand condition occurs, is

  • 0.25
  • 0.50
  • 0.75
  • 1.00

35. The fluid generally used for grouting is

  • cement and water mix
  • sodium silicate
  • bitumen emulsion
  • all the above.

36. The clay soil mainly consists of

  • Montomorillonite
  • Illites
  • Vermiculite
  • All the above.

37. The seepage force in a soil, is

  • perpendicular to the equipotential lines
  • proportional to the exit graident
  • proportional to the head loss
  • all the above.

38. The ultimate Settlement of a soil is directly proportional to:

  • depth of the compressible soil strata
  • compressive index
  • void ratio
  • both (a) and (b)

39. Back fill with a sloping surface exerts a total active pressure Pa on the wall of height H and acts at

  • H/4 above the base parallel to base
  • H/2 above the base parallel to base
  • H/3 above the base parallel to base
  • H/5 above the base parallel to base.

40. The liquid limit and plastic limit exist in

  • clay soils.
  • silty soils
  • gravel soils
  • sandy soils

41. If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by

  • a = L.R/S
  • a = S.R/ L
  • a = L.S/R
  • none of these.

42. Stoke's law sates that the velocity at which a grain settles out of suspension, the other factors remaining constant, is dependent upon

  • shape of grain
  • weight of grain
  • shape and size of grain
  • shape, size and weight of grain.

43. Accurate determination of water content, is made by

  • calcium carbide method
  • oven-drying method.
  • alcohol method
  • sand bath method

44. The water content of soil is defined as the ratio of

  • volume of water to volume of given soil
  • volume of water to volume of voids in soil
  • weight of water to weight of air in voids
  • weight of water to weight of solids of given mass of soil.

45. Rankine's theory of active earth pressure assumes

  • soil mass is homogeneous, dry and cohesionless
  • ground surface is a plane which may be horizontal or inclined
  • back of the wall is vertical and smooth
  • all the above.

46. Degree of saturation of a natural soil deposit having water content 15%, specific gravity 2.50 and void ratio 0.5, is

  • 50%
  • 60%
  • 75%
  • 80%

47. According to Coulomb's wedge theory, the active earth pressure slides the wedge

  • down and outwards on a slip surface
  • up and inwards on a slip surface
  • horizontal upward and parallel to base
  • horizontal inward and parallel to base.

48. The effective size of particles of soil is denoted by

  • D10
  • D20
  • D30
  • D60

49. The coefficient of curvature is defined

  • D30² D60D10
  • D60 D10
  • N 2 D10² D30D60
  • D10 D60

50. Minimum depth of a footing carrying a heavy load, is calculated by the formula

  • d 3W 4fL (L + 1)
  • d= 3W 4fL (L-1)
  • d = (L-1) 4fL 3W
  • d= (L-1) 2W 3fL

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