Geotechnical Engineering MCQs Set-2

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1. Coefficient of permeability of soil

does not depend upon temperature

increases with the decrease in temperature

none of these

increases with the increase in temperature

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

silt

clay

sand

clayey silt

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

zero

negative

1

non-plastic (NP)

4. Toughness index is defined as the ratio of

plasticity index to consistency index

liquidity index to flow index

consistency index to liquidity index

plasticity index to flow index

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

plasticity characteristics

particle size composition

both particle size composition and plasticity characteristics

none of these

6. 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

solid state

semi-solid state

liquid state

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

plastic limit

shrinkage limit

liquid limit

plasticity index

8. Sensitivity of a soil can be defined as

percentage of volume change of soil under saturated condition

none of these

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

ratio of volume of voids to volume of solids

9. 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)

d) none of these

a) constant head method

10. Cohesive soils are

poor for backfill because of large lateral pressure

none of these

good for backfill because of high shear strength

good for backfill because of low lateral pressure

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11. Inorganic soils with low compressibility are represented by

ML

MH

SL

CH

12. A pycnometer is used to determine

specific gravity and dry density

voids ratio and dry density

water content and specific gravity

water content and voids ratio

13. Time factor for a clay layer is

directly proportional to permeability of soil

a dimensional parameter

independent of thickness of clay layer

inversely proportional to drainage path

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

greater than specific gravity of soil

equal to specific gravity of soil

less than specific gravity of soil

independent of specific gravity of soil

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

loess

drift

talus

dune sand

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

clay

sand

gravel

silt

17. The effect of cohesion on a soil is to

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

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

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

illite

none of these

kaolinite

montmorillonite

19. Uniformity coefficient of a soil is

always less than 1

equal to or greater than 1

equal to or less than 1

always equal to 1

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

dehydrated soil

partially saturated soil

dry soil

air entrained soil

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21. The shear strength of a soil

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

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

decreases with increase in normal stress

decreases with decrease in normal stress

22. Sand particles are made of

kaolinite

rock minerals

montmorillonite

illite

23. Phreatic line in an earthen dam is

elliptical

parabolic

straight line

circular

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

0.6

0.95

1.20

0.4

25. Coefficient of consolidation of a soil is affected by

none of these

permeability

both compressibility and permeability

compressibility

26. Degree of consolidation is

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

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

directly proportional to drainage path and inversely proportional to time

directly proportional to time and inversely proportional to drainage path

27. Residual soils are formed by

wind

none of these

glaciers

water

28. A fully saturated soil is said to be

two phase system with soil and water

three phase system

one phase system

two phase system with soil and air

29. 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

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

electro-osmosis method

vacuum method

well point system

deep well system

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

all of these

less than 0.0002 mm

greater than 0.2 mm

between 0.2 mm and 0.0002 mm

32. Unconfined compressive strength test is

drained test

undrained test

consolidated drained test

consolidated undrained test

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

over-consolidated clay with a high over-consolidation ratio

over-consolidated clay with a low over-consolidation ratio

normally consolidated clay

under-consolidated clay

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

effective size

uniformity coefficient

coefficient of curvature

none of these

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

percentage air voids

air content

voids ratio

porosity

36. Rate of consolidation

increases with decrease in temperature

is independent of temperature

increases with increase in temperature

is unaffected by permeability of soil

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

both effective stress and total stress

none of these

total stress only

effective stress only

38. Coarse grained soils are best compacted by a

sheep's foot roller

drum roller

vibratory roller

rubber tyred roller

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

plane and smooth

vertical and rough

plane and rough

vertical and smooth

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

6

9

3

16

Geotechnical Engineering MCQs Set-2

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