Geotechnical Engineering MCQs Set-2

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1. Phreatic line in an earthen dam is

straight line

circular

elliptical

parabolic

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

none of these

plasticity characteristics

both particle size composition and plasticity characteristics

particle size composition

3. Degree of consolidation is

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

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

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

independent of specific gravity of soil

equal to specific gravity of soil

less than specific gravity of soil

greater than specific gravity of soil

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

percentage air voids

voids ratio

porosity

air content

6. Coefficient of consolidation of a soil is affected by

none of these

both compressibility and permeability

compressibility

permeability

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

all of these

between 0.2 mm and 0.0002 mm

less than 0.0002 mm

greater than 0.2 mm

8. A fully saturated soil is said to be

two phase system with soil and water

one phase system

three phase system

two phase system with soil and air

9. Inorganic soils with low compressibility are represented by

ML

SL

CH

MH

10. 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

under-consolidated clay

normally consolidated clay

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11. Time factor for a clay layer is

inversely proportional to drainage path

independent of thickness of clay layer

directly proportional to permeability of soil

a dimensional parameter

12. Cohesive soils are

none of these

good for backfill because of low lateral pressure

poor for backfill because of large lateral pressure

good for backfill because of high shear strength

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

3

6

9

16

14. 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

15. Coarse grained soils are best compacted by a

rubber tyred roller

vibratory roller

drum roller

sheep's foot roller

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

vacuum method

deep well system

electro-osmosis method

well point system

17. Toughness index is defined as the ratio of

plasticity index to consistency index

plasticity index to flow index

consistency index to liquidity index

liquidity index to flow index

18. The effect of cohesion on a soil is to

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

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

reduce 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

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

liquid limit

plastic limit

plasticity index

shrinkage limit

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

1

non-plastic (NP)

negative

zero

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

none of these

uniformity coefficient

coefficient of curvature

effective size

22. Uniformity coefficient of a soil is

equal to or less than 1

equal to or greater than 1

always less than 1

always equal to 1

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

vertical and rough

plane and smooth

vertical and smooth

plane and rough

24. Unconfined compressive strength test is

consolidated undrained test

undrained test

drained test

consolidated drained test

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

a) constant head method

b) falling head method

d) none of these

c) both of (a) and (b)

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

gravel

sand

silt

clay

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

dry soil

dehydrated soil

air entrained soil

partially saturated soil

28. Residual soils are formed by

wind

none of these

water

glaciers

29. 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

ratio of volume of voids to volume of solids

none of these

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

montmorillonite

kaolinite

none of these

illite

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

1.20

0.6

0.4

0.95

32. Sand particles are made of

illite

rock minerals

montmorillonite

kaolinite

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

sand

clay

clayey silt

silt

34. The shear strength of a 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

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

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

total stress only

both effective stress and total stress

effective stress only

none of these

36. A pycnometer is used to determine

water content and voids ratio

water content and specific gravity

voids ratio and dry density

specific gravity and dry density

37. Rate of consolidation

is unaffected by permeability of soil

increases with decrease in temperature

is independent of temperature

increases with increase in temperature

38. 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

39. At liquid limit, all soils possess

different shear strengths of small magnitude

same shear strength of large magnitude

different shear strengths of large magnitude

same shear strength of small magnitude

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

drift

talus

loess

dune sand

Geotechnical Engineering MCQs Set-2

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