Geotechnical Engineering MCQs Set-2

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1. Uniformity coefficient of a soil is

equal to or less than 1

always less than 1

equal to or greater than 1

always equal to 1

2. Which of the following types of soil is transported by gravitational forces?

talus

dune sand

drift

loess

3. Coefficient of consolidation of a soil is affected by

compressibility

permeability

none of these

both compressibility and permeability

4. Degree of consolidation is

directly proportional to drainage path and inversely proportional to time

directly proportional to time and inversely proportional to drainage path

directly proportional to square of drainage path and inversely proportional to time

directly proportional to time and inversely proportional to square of drainage path

5. If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in

plastic state

liquid state

solid state

semi-solid state

6. Shear strength of a soil is a unique function of

total stress only

none of these

both effective stress and total stress

effective stress only

7. Which one of the following clays behaves like a dense sand?

over-consolidated clay with a high over-consolidation ratio

normally consolidated clay

over-consolidated clay with a low over-consolidation ratio

under-consolidated clay

8. Sensitivity of a soil can be defined as

ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

percentage of volume change of soil under saturated condition

none of these

ratio of volume of voids to volume of solids

9. The clay mineral with the largest swelling and shrinkage characteristics

illite

none of these

montmorillonite

kaolinite

10. If the plasticity index of a soil mass is zero, the soil is

clay

sand

silt

clayey silt

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11. Phreatic line in an earthen dam is

parabolic

circular

elliptical

straight line

12. Residual soils are formed by

glaciers

none of these

wind

water

13. The most suitable method for drainage of fine grained cohesive soils is

electro-osmosis method

well point system

deep well system

vacuum method

14. Unconfined compressive strength test is

consolidated undrained test

consolidated drained test

undrained test

drained test

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

liquid limit

plasticity index

shrinkage limit

plastic limit

16. Stoke's law is valid only if the size of particle is

between 0.2 mm and 0.0002 mm

less than 0.0002 mm

all of these

greater than 0.2 mm

17. Highway Research Board (HRB) classification of soils is based on

both particle size composition and plasticity characteristics

plasticity characteristics

particle size composition

none of these

18. Toughness index is defined as the ratio of

liquidity index to flow index

plasticity index to flow index

plasticity index to consistency index

consistency index to liquidity index

19. Rate of consolidation

is unaffected by permeability of soil

is independent of temperature

increases with decrease in temperature

increases with increase in temperature

20. If the voids of a soil mass are full of air only, the soil is termed as

partially saturated soil

dehydrated soil

air entrained soil

dry soil

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21. Relative density of a compacted dense sand is approximately equal to

1.20

0.4

0.6

0.95

22. When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as

negative

1

non-plastic (NP)

zero

23. Sand particles are made of

illite

rock minerals

kaolinite

montmorillonite

24. At liquid limit, all soils possess

different shear strengths of large magnitude

different shear strengths of small magnitude

same shear strength of large magnitude

same shear strength of small magnitude

25. Which of the following is a measure of particle size range?

uniformity coefficient

effective size

none of these

coefficient of curvature

26. Cohesive soils are

good for backfill because of low lateral pressure

none of these

poor for backfill because of large lateral pressure

good for backfill because of high shear strength

27. Coarse grained soils are best compacted by a

rubber tyred roller

vibratory roller

drum roller

sheep's foot roller

28. If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

equal to specific gravity of soil

greater than specific gravity of soil

independent of specific gravity of soil

less than specific gravity of soil

29. Which of the following methods is best suited for determination of permeability of coarse-grained soils?

d) none of these

c) both of (a) and (b)

a) constant head method

b) falling head method

30. Rankine's theory of earth pressure assumes that the back of the wall is

vertical and smooth

plane and smooth

vertical and rough

plane and rough

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31. Total number of stress components at a point within a soil mass loaded at its boundary is

6

9

16

3

32. A pycnometer is used to determine

voids ratio and dry density

water content and specific gravity

specific gravity and dry density

water content and voids ratio

33. Coefficient of permeability of soil

increases with the increase in temperature

increases with the decrease in temperature

none of these

does not depend upon temperature

34. Time factor for a clay layer is

independent of thickness of clay layer

directly proportional to permeability of soil

inversely proportional to drainage path

a dimensional parameter

35. The shear strength of a soil

is directly proportional to the angle of internal friction of the soil

decreases with increase in normal stress

is inversely proportional to the angle of internal friction of the soil

decreases with decrease in normal stress

36. A fully saturated soil is said to be

one phase system

three phase system

two phase system with soil and air

two phase system with soil and water

37. The ratio of volume of voids to the total volume of soil mass is called

percentage air voids

air content

porosity

voids ratio

38. Which of the following soils has more plasticity index?

silt

sand

gravel

clay

39. Inorganic soils with low compressibility are represented by

MH

SL

ML

CH

40. The effect of cohesion on a soil is to

reduce both the active earth pressure intensity and passive earth pressure intensity

increase the active earth pressure intensity but to reduce the passive earth pressure intensity

reduce the active earth pressure intensity but to increase the passive earth pressure intensity

increase both the active earth pressure intensity and passive earth pressure intensity

Geotechnical Engineering MCQs Set-2

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