Geotechnical Engineering Set 11 MCQs

Q1 | Pick up the correct statement from the following:

The property of a soil that enables it to become stiff in a relatively short time on standing is called thixotropy

The ratio of shear strength in natural state to the remoulded shear strength under undrained conditions is called degree of sensitivity

The difference between the undisturbed shear strength and remoulded shear strength is known remoulding loss

All the above

Q2 | Voids ratio of a soil mass can

Never be greater than unity

Be zero

Take any value greater than zero

Take values between 0 and 1 only

Q3 | If the cohesive force (c), is 1.5 t/m2, the density ) of the soil is 2.0 t/m3, factor of safety (F) is 1.5and stability factor (Sn) is 0.05, the safe height of a slope is

5 metres

8 metres

10 metres

12 metres

Q4 | If the plasticity index of a soil mass is zero, the soil is

Sand

Silt

Clay

Clayey silt

Q5 | Coulomb's wedge theory assumes that

Back fill is dry, cohesionless, homogeneous and isotropic

Slip surface is the plane which passes through the heel of the wall

Position and direction of the resultant earth pressure are known

All the above

Q6 | Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability

Increases by 25 %

Increases by 50 %

Increases by 33.3 %

Decreases by 33.3 %

Q7 | Transporting and re-depositing soils, is done by

Water

Glacier

Gravity

All the above

Q8 | For a loose sand sample and a dense sand sample consolidated to the same effective stress

Ultimate strength is same and also peak strength is same

Ultimate strength is different but peak strength is same

Ultimate strength is same but peak strength of dense sand is greater than that of loose sand

Ultimate strength is same but peak

Q9 | The void ratio of a soil sample decreases from 1.50 to 1.25 when the pressure is increased from 25 tonnes/m2 to 50 tonnes/m2, the coefficient of compressibility is

0.01

0.02

0.05

0.001

Q10 | The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is

03-Jan

3

1

02-Jan

Q11 | If the degree of saturation of a partially saturated soil is 60%, then air content of the soil is

40%

60%

80%

100%

Q12 | 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

Q13 | According to IS classification, the range of silt size particles is

4.75 mm to 2.00 mm

2.00 mm to 0.425 mm

0.425 mm to 0.075 mm

0.075 mm to 0.002 mm

Q14 | Pick up the clay soil group which does not swell when wet from the following:

Kaolinite group

Mite group

Vermiculite group

Montrorillonite group

Q15 | Coefficient of consolidation of a soil is affected by

Compressibility

Permeability

Both compressibility and permeability

None of the above

Q16 | Pick up the correct statement from the following:

When water table is above the base of a footing, the dry weight m should be used for soil below water table

When water table is located somewhat below the base of a footing, the elastic wedge is partly of moist soil and partly of submerged soil, and a suitable reduction factor is used

When water table is just at the base of the footing, no reduction factor is used

None of these

Q17 | Select the incorrect statement. Effective angle of shearing resistance

Increases as the size of particles increases

Increases as the soil gradation improves

Is limited to a maximum value of 45°

Is rarely more than 30° for fine grained soil

Q18 | The relationship between void ratio (e) and porosity ratio (n) is:

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

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

n = e/(1 - e)

e = n/(1 - n)

Q19 | Relative density of a compacted dense sand is approximately equal to

0.4

0.6

0.95

1.2

Q20 | Pick up the correct statement from the following:

To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants

To a geologist, soil is the material in a relatively thin surface zone within which roots occur, and rest of the crust is termed as rock irrespective of hardness

To an engineer, soil is the unaggregated and uncemented deposits of minerals and organic particles covering the earth's crust

All the above

Q21 | Inorganic soils with low compressibility are represented by

MH

SL

ML

CH

Q22 | In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

Consolidated drained test

Consolidated undrained test

Unconsolidated drained test

Unconsolidated undrained test

Q23 | The specific gravity of quartz, is

2.65

2.72

2.85

2.9

Q24 | In hydrometer analysis for a soil mass

Both meniscus correction and dispersing agent correction are additive

Both meniscus correction and dispersing agent correction are subtractive

Meniscus correction is additive and dispersing agent correction is subtractive

Meniscus correction is subtractive and dispersing agent correction is additive

Q25 | The capillary rise of water

Depends upon the force responsible

Increases as the size of the soil particles increases

Decreases as the size of the soil particles decreases

Is less in wet soil than in dry soil