Geotechnical Engineering Set 5 MCQs

Q1 | The plasticity of fine soils may be assessed by means of

Dry strength test

Toughness test

Dilatancy test

All of these

Q2 | Pick up the correct statement from the following:

Sandy clayloam contains highest percentage of sand

Silty clayloam contains highest percentage of silt

Stiff boulder clay offers maximum shear strength

Soft chalk carries least safe load

Q3 | For general engineering purposes, soils are classified by

Particle size classification system

Textural classification system

High Way Research Board (HRB), classification system

Unified soil classification system

Q4 | Water content of soil can

Never be greater than 100 %

Take values only from 0 % to 100 %

Be less than 0 %

Be greater than 100 %

Q5 | Pick up the correct statement from the following:

Failure plane carries maximum shear stress

Failure plane does not carry maximum shear stress

Failure plane carries shear stress equal to maximum shear stress

None of these

Q6 | The phreatic line in an earth dam may be

Circular

Elliptical

Parabolic

A straight line

Q7 | If the voids of a soil mass are full of air only, the soil is termed as

Air entrained soil

Partially saturated soil

Dry soil

Dehydrated soil

Q8 | On wetting, cohesive soils,

Loose permeability

Gain shear strength

Loose elasticity

Decrease their shear strength

Q9 | A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the degree of saturation, is

95.40%

95.50%

95.60%

95.70%

Q10 | Select the correct range of density index, ID

ID > 0

ID < 0

0 < ID < 1

Q11 | A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the void ratio, is

0.858

0.86

0.862

0.864

Q12 | If the specific gravity and voids in soil sample are G and e respectively, the hydraulic gradient i,is

(G - 1)/(1 + e)

(G + 1)/(1 - e)

(1 - G)/(1 + e)

(1 + G)/(1 + e)

Q13 | In a flow net

Flow lines and equipotential lines cross each other at right angles

Fields are rectangles whose length is twice the breadth

Smaller the dimensions of the field, smaller will be the hydraulic gradient and velocity of flow through it

For homogeneous soil, the curves are smooth and circular

Q14 | Which of the following methods is most accurate for the determination of the water contentof soil?

Oven drying method

Sand bath method

Calcium carbide method

Pycnometer method

Q15 | The reduction in volume of soil due to squeezing out of water from the voids, is termed

Primary consolidation

Primary compression

Primary time effect

All the above

Q16 | Which of the following statements is correct?

Uniformity coefficient represents the shape of the particle size distribution curve.

For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.

A soil is said to be well graded if it has most of the particles of about the same size

None of the above

Q17 | The water content of soil, which represents the boundary between plastic state and liquid state,is known as

Liquid limit

Plastic limit

Shrinkage limit

Plasticity index

Q18 | The specific gravity of Calcite is

2.65

2.72

2.85

2.9

Q19 | The direct shear test suffers from the following disadvantage:

Drain condition cannot be controlled

Pore water pressure cannot be measured

Shear stress on the failure plane is not uniform

The area under the shear and vertical loads does not remain constant throughout the test

Q20 | The clay mineral with the largest swelling and shrinkage characteristics is

Kaolinite

Illite

Montmorillonite

None of the above

Q21 | The length/diameter ratio of cylindrical specimens used in triaxial test, is generally

1

1.5

2

2.5

Q22 | The maximum load carried by a pile, when it continues to sink without further increase of load, is known as

Ultimate load carrying capacity

Ultimate bearing capacity

Ultimate bearing resistant

All the above

Q23 | The seepage exit gradient in a soil is the ratio of

Total head to the length of seepage

Flow line to slope

Head upstream to that at downstream

Head loss to the length of the seepage

Q24 | Which of the following methods is more suitable for the determination of permeability of clayey soil?

Constant head method

Falling head method

Horizontal permeability test

None of the above

Q25 | A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm2 per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required

3233

3123

33331

3313