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This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 5

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
- 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