# Soil Mechanics and Foundations MCQ Civil Engineering

50 Questions 30 Mins

### 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

• 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

• 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.

• 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

• 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

• Loess
• Marine
• Alluvial
• Lacustrine

• 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)

• 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.

• 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

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

### 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.

• 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.

• 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