### Geotechnical Engineering Set 6

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 6

Q1 | The ratio of the difference between the void ratio of the soil in its loosest state and its natural void ratio (e) to the difference between the void ratios in the loosest and fully dense state, is generally termed as
• Degree of density
• Relativity
• Density index
• All the above
Q2 | For determining the ultimate bearing capacity of soil, the recommended size of a square bearing plate to be used in load plate test should be 30 to 75 cm square with a minimum thickness of
• 5 mm
• 10 mm
• 15 mm
• 25 mm
Q3 | Within the consolidation process of a saturated clay
• A gradual increase in neutral pressure and a gradual decrease in effective pressure take place and sum of the two is constant
• A gradual decrease in neutral pressure and a gradual increase in effective pressure take place and sum of the two is constant
• Both neutral pressure and effective pressure decrease
• Both neutral pressure and effective pressure increase
Q4 | An unsaturated 100 cm3 sample of soil weighs 190 g. If its dried weight is 160 g, watercontent of the soil, is
• 0.188
• 0.288
• 0.388
• 0.588
Q5 | Pick up the correct statement from the following:
• If the ratio of depth to width is less than 2, it is shallow foundation
• If the ratio of depth to width is more than 2, it is deep foundation
• If the ratio of the length to width is between 1 and 2, it is spread foundation
• All the above
Q6 | Pick up the correct statement from the following:
• A maximum value of dry density is obtained at optimum water content
• At low value of water content most soils tend to be stiff
• At high water content, the dry density decreases with an increase of water content
• All the above
Q7 | Select the correct statement.
• Coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay
• Coefficient of compressibility of an over-consolidated clay is greater than that of a normally consolidated clay
• Coefficient of compressibility is constant for any clay
• None of the above
Q8 | Pick up the correct statement from the following:
• Isotropic consolidation of clay can be obtained in the triaxial apparatus under equal all-round pressure
• If the present effective stress is the maximum to which the clay has ever been subjected, it is called normally consolidated clay
• If the present effective stress in the past was more than present effective stress, it is called over-consolidated clay
• All the above
Q9 | Compression of soil occurs rapidly if voids are filled with
• Air
• Water
• Partly with air and partly with water
• None of these
Q10 | For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
• Dry of OMC and wet of OMC
• Wet of OMC and dry of OMC
• Wet of OMC and wet of OMC
• Dry of OMC and dry of OMC where OMC is optimum moisture content
Q11 | Chemical weathering of soil is caused due to
• Oxidation
• Carbonation
• Hydration
• All the above
Q12 | According to IS : 2720 - 1965, the composition of a dispersing solution used in pipette analysis for determining the size of particles, is
• sodium-hexametaphosphate 33 g, sodium carbonate 7 g and distilled water one litre
• sodium-hexametaphosphate 7 g, sodium carbonate 33 g and distilled water one litre
• sodium-hexametaphosphate 23 g, sodium carbonate 17 g and distilled water one litre
• None of these
Q13 | The minimum depth of building foundations on
• Sandy soils is 80 cm to 100 cm
• Clay soils is 90 cm to 160 cm
• Rocky soils is 5 cm to 50 cm
• All the above
Q14 | The effect of cohesion on a soil is to
• Reduce both the active earth pressure intensity and passive earth pressure intensity
• Increase both the active earth pressure intensity and passive earth pressure intensity
• Reduce the active earth pressure intensity but to increase the passive earth pressure intensity
• Increase the active earth pressure intensity but to reduce the passive earth pressure intensity
Q15 | If voids ratio is 0.67, water content is 0.188 and specific gravity is 2.68, the degree ofsaturation of the soil, is
• 25%
• 40%
• 60%
• 75%
Q16 | Pick up the incorrect statement from the following:
• The smaller the size of the pores, the higher the water can rise above the water table
• Below the water table, the pore water may be static
• The hydrostatic pressure depends on the depth below the water level
• None of these
Q17 | A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces 299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that of paraffin 0.9, the void ratio of soil, is
• 0.55
• 0.6
• 0.65
• 0.7
Q18 | Select the incorrect statement.
• Bearing capacity of a soil depends upon the amount and direction of load
• Bearing capacity of a soil depends on the type of soil
• Bearing capacity of a soil depends upon shape and size of footing
• Bearing capacity of a soil is independent of rate of loading
Q19 | Over-consolidation of soils is caused due to
• Erosion of over burden
• Melting of ice sheets after glaciations
• Permanent rise of water table
• All the above
Q20 | The consistency index of a soil is defined as the ratio of
• Liquid limit plus the natural water content to the plasticity index of the soil
• Liquid limit minus the natural water content to the plasticity index of the soil
• Natural water content of a soil minus plastic limit to the plasticity index of the soil
• Natural water content of a soil plus its plastic limit to the plasticity index of the soil
Q21 | Which of the following types of soil is transported by gravitational forces?
• Loess
• Talus
• Drift
• Dune sand
Q22 | Soil classification of composite soils, exclusively based on the particle size distribution, is known
• Particle classification
• Textural classification
• High Way Research Board classification
• Unified soil classification
Q23 | When the degree of saturation is zero, the soil mass under consideration represents
• One phase system
• Two phase system with soil and air
• Two phase system with soil and water
• Three phase system
Q24 | Pick up the cohesive soil from the following:
• Red earth
• Clay
• Black cotton soil
• Compacted ground
Q25 | For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass?
• Oven drying method
• Sand bath method
• Alcohol method
• Calcium carbide method