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Geo Terms (less)
terms and objective questions for geotechnical engineering
| Question | Answer |
|---|---|
| Ratio of volume of voids and volume of soil. | Porosity |
| Ratio of volume of voids and volume of soil solids. | Void Ratio |
| Ratio of volume of water and volume of soil. A. Degree of Saturation B. Void Ratio C. Porosity D. None of the above | D. None of the above |
| What is the range of values for porosity? | 0 < n < 100 |
| What is the range of values for void ratio? | 0 < e < 100 |
| What is the range of values for degree of saturation? | 0 ≤ S ≤ 100 |
| When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction of flow. This phenomenon is generally known | Quick condition Boiling condition Quick sand |
| Soil in civil engineering is A. The material in a relatively thin surface zone within roots occur B. The unaggregated and uncemented deposits of minerals and organic particles covering the earth’s crust C. The substance [...] grows and develops plants | B. |
| If the ground water table in a soil formation rises as resulting of flooding, the bearing capacity of the soil _________. | Decreases |
| One of the following foundation conditions does not affect the bearing capacity of the supporting soil. A. Unit weight of the soil B. Depth of the founding offootings C. Load imposed onto the soil D. Position of ground water table | C. Load imposed onto the soil |
| A process by which water-saturated soil sediment temporarily loss strength and acts as a fluid. | Liquefaction |
| Volume change in saturated soils caused by the expulsion of pore water from loading? | Primary Consolidation |
| Negative skin friction on piles.. A. Is caused due to relative settlement of the soil B. Is caused in soft clays C. Decreases the pile capacity D. All of the above | D. All of the above |
| A decrease in water content results in a reduction of the volume of soil in: A. Liquid state B. Plastic state C. Semi-solid state D. All of these | D. All of these |
| The water content in a soil sample when it continues to loose weight without loosing the volume, is called | Shrinkage limit |
| The maximum shear stress occurs on the filament which makes an angle with the horizontal plane equal to | 45° |
| In the triaxial test, the deviator stress increases the shear stress on what plane? | All planes except the horizontal and vertical planes |
| The shear strength of a soil: A. Increases with an increase in the normal stress B. is proportional to the cohesion of the soil C. Is generally known as the strength of the soil D. All of the above | D. All of the above |
| Pick up the correct statement from the following: A. Failure plane carries maximum shear stress B. Failure plane does not carry maximum shear stress C. Failure plane carries shear stress equal to maximum shear stress D. None of these | B. Failure plane does not carry maximum shear stress |
| Which of the following tests is not done on a laboratory set up? A. Direct shear test B. Vane shear test C. Triaxial test D. Unconfined compression test | B. Vane shear test |
| A cohesionless soil is considered very loose if the SPT “N” value is | < 4 |
| A cohesionless soil is considered loose if the SPT “N” value is | 4 to 10 |
| A cohesionless soil is considered compact if the SPT “N” value is between | 10 to 30 |
| A cohesionless soil is considered dense if the SPT “N” value is between | 30 to 50 |
| A cohesionless soil is considered very dense if the SPT “N” value is | > 50 |
| Soil grains with particle size greater than 4.75 mm but less than 75 mm according to USCS. | Gravel |
| Soil grains with particle size is greater than 75 mm according to USCS. | Cobble |
| A practice of procedure used to asses the particle size distribution (also called gradation) of a granular material. The size distribution is often of critical importance to the way the material performs in use. | Sieve Analysis |
| The over consolidation ratio (OCR) of an over consolidated soil is | Greater than 1 |
| The over consolidation ratio (OCR) of a normally consolidated soil is: | Equal to 1 |
| An index used to identify the swelling potential of clay soils is called | Activity |
| The property of a soil which permits water to percolate through it | Permeability |
| Which method is best suited for determination of permeability of coarse-grained soils? A. Constant head method B. Falling head method C. Both the above D. None of the above | A. Constant head method |
| Which method is best suited for determination of permeability of fine-grained soils? A. Constant head method B. Falling head method C. Both the above D. None of the above | B. Falling head method |
| Terzaghi's bearing capacity factors Nc, Nq and Nγ are functions of A. Cohesion only B. Angle of internal friction only C. Both cohesion and angle of internal friction D. None of the above | B. Angle of internal friction only |
| Coefficient of earth pressure at rest is | Greater than active earth pressure but less than passive earth pressure |
| The average coefficient of permeability of natural deposits | Parallel to stratification is always greater than that perpendicular to stratification |
| The relative density of very loose soil, in percent, is | 0 - 15 |
| The relative density of loose soil, in percent, is: | 15 - 35 |
| The relative density of medium dense soil, in percent, is: | 35 - 65 |
| The relative density of dense soil, in percent, is: | 65 - 85 |
| The relative density of very dense soil, in percent, is: | 85 - 100 |
| Rise of water table above the ground surface causes | Equal increase in pore water pressure and total stress |
| The shear strength of a soil __________ with decrease in normal stress | decreases |
| Effective stress on soil: A. Increases voids ratio and decreases permeability B. Increases both voids ratio and permeability C. Decreases both voids ratio and permeability D. Decreases voids ratio and increases permeability | C. Decreases both voids ratio and permeability |
| The coefficient of compressibility of soil, is the ratio of: A. Stress to strain B. Strain to stress C. Stress to settlement D. Rate of loading to that of settlement | B. Strain to stress |
| If the shearing stress is zero on two planes, then the angle between the two planes is | 90° |
| Compression of soil occurs rapidly if voids are filled with | Air |
| Cohesionless soil is A. Sand B. Silt C. Clay D. Clay and silt | Sand |
| In a triaxial compression test when drainage is allowed during the first stage only and not during the second stage, the test is known as | Consolidated undrained test |
| Coefficient of consolidation of a soil is affected by A. Compressibility B. Permeability C. Both compressibility and permeability D. None | C. Both compressibility and permeability |
| The total and effective stresses at a depth of 0.5 m below the top level of water in a swimming pool is respectively: A. Zero and zero B. 500 kg/m² and zero C. 500 kg/m² and 500 kg/m² D. 1000 kg/m² and 500 kg/m² | B. 500 kg/m² and zero |
| If the sand in-situ is in its densest state, then the relative density of sand is | 1 |
| Accurate determination of water content, is made by | Oven-drying method |
| formula for coefficient of compressibility | aᵥ = e₁ - e₂ / (P₂ - P₁) |
| formula for coefficient of volume compressibility | mᵥ = aᵥ / (1 + eₐᵥₑ ) |
| formula for coefficient of consolidation | Cv = Hdr²Tv / t |
| formula for hydraulic conductivity, k in relation to coefficient of consolidation | k = Cvmᵥγᵥᵥ |
| formula for overconsolidation ratio (define each variable) | OCR = Pc / Po Pc = maximum consolidation (past) Po = present consolidation |
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