Geotechnical Engineering MCQs Set-2

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1. A fully saturated soil is said to be

two phase system with soil and air

three phase system

two phase system with soil and water

one phase system

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

solid state

liquid state

semi-solid state

plastic state

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

less than 0.0002 mm

greater than 0.2 mm

all of these

between 0.2 mm and 0.0002 mm

4. Time factor for a clay layer is

inversely proportional to drainage path

directly proportional to permeability of soil

independent of thickness of clay layer

a dimensional parameter

5. Sand particles are made of

illite

kaolinite

rock minerals

montmorillonite

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

uniformity coefficient

coefficient of curvature

none of these

effective size

7. 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

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

plane and rough

vertical and rough

vertical and smooth

plane and smooth

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

dehydrated soil

air entrained soil

partially saturated soil

dry soil

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

deep well system

well point system

electro-osmosis method

vacuum method

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

talus

dune sand

drift

loess

12. Degree of consolidation is

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

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

directly proportional to drainage path and inversely proportional to time

directly proportional to time and inversely proportional to drainage path

13. Coefficient of permeability of soil

none of these

does not depend upon temperature

increases with the decrease in temperature

increases with the increase in temperature

14. Coefficient of consolidation of a soil is affected by

compressibility

both compressibility and permeability

none of these

permeability

15. Cohesive soils are

poor for backfill because of large lateral pressure

good for backfill because of high shear strength

none of these

good for backfill because of low lateral pressure

16. A pycnometer is used to determine

specific gravity and dry density

water content and specific gravity

water content and voids ratio

voids ratio and dry density

17. The shear strength of a soil

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

decreases with decrease in normal stress

decreases with increase in normal stress

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

18. Unconfined compressive strength test is

drained test

consolidated undrained test

undrained test

consolidated drained test

19. Rate of consolidation

increases with increase in temperature

is unaffected by permeability of soil

increases with decrease in temperature

is independent of temperature

20. 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

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21. Uniformity coefficient of a soil is

always less than 1

equal to or less than 1

equal to or greater than 1

always equal to 1

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

porosity

air content

voids ratio

percentage air voids

23. Coarse grained soils are best compacted by a

rubber tyred roller

sheep's foot roller

drum roller

vibratory roller

24. Inorganic soils with low compressibility are represented by

MH

ML

SL

CH

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

sand

silt

clayey silt

clay

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

9

6

16

3

27. Sensitivity of a soil can be defined as

percentage of volume change of soil under saturated condition

ratio of volume of voids to volume of solids

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

none of these

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

clay

gravel

silt

sand

29. Toughness index is defined as the ratio of

consistency index to liquidity index

plasticity index to consistency index

plasticity index to flow index

liquidity index to flow index

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

b) falling head method

c) both of (a) and (b)

a) constant head method

d) none of these

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

under-consolidated clay

normally consolidated clay

over-consolidated clay with a low over-consolidation ratio

over-consolidated clay with a high over-consolidation ratio

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

0.6

0.4

1.20

0.95

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

none of these

effective stress only

both effective stress and total stress

total stress only

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

non-plastic (NP)

zero

1

negative

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

both particle size composition and plasticity characteristics

particle size composition

none of these

plasticity characteristics

36. Residual soils are formed by

none of these

wind

glaciers

water

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

none of these

kaolinite

illite

montmorillonite

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

less than specific gravity of soil

greater than specific gravity of soil

independent of specific gravity of soil

equal to specific gravity of soil

39. 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

40. Phreatic line in an earthen dam is

straight line

elliptical

parabolic

circular

Geotechnical Engineering MCQs Set-2

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