Geotechnical Engineering MCQs Set-2

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

none of these

both particle size composition and plasticity characteristics

plasticity characteristics

particle size composition

2. Inorganic soils with low compressibility are represented by

SL

ML

CH

MH

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

coefficient of curvature

effective size

uniformity coefficient

none of these

4. A pycnometer is used to determine

water content and voids ratio

water content and specific gravity

specific gravity and dry density

voids ratio and dry density

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

clay

sand

silt

clayey silt

6. Sand particles are made of

kaolinite

rock minerals

montmorillonite

illite

7. 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

8. Coarse grained soils are best compacted by a

rubber tyred roller

vibratory roller

sheep's foot roller

drum roller

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

plasticity index

plastic limit

shrinkage limit

liquid limit

10. The shear strength of a soil

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

decreases with decrease in normal stress

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

decreases with increase in normal stress

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

c) both of (a) and (b)

d) none of these

a) constant head method

b) falling head method

12. Rate of consolidation

is independent of temperature

is unaffected by permeability of soil

increases with increase in temperature

increases with decrease in temperature

13. Phreatic line in an earthen dam is

circular

straight line

parabolic

elliptical

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

dune sand

drift

loess

talus

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

plane and rough

vertical and smooth

plane and smooth

vertical and rough

16. Coefficient of consolidation of a soil is affected by

both compressibility and permeability

permeability

compressibility

none of these

17. Toughness index is defined as the ratio of

liquidity index to flow index

consistency index to liquidity index

plasticity index to consistency index

plasticity index to flow index

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

both effective stress and total stress

effective stress only

none of these

total stress only

19. Time factor for a clay layer is

independent of thickness of clay layer

inversely proportional to drainage path

directly proportional to permeability of soil

a dimensional parameter

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

clay

gravel

sand

silt

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21. Cohesive soils are

poor for backfill because of large lateral pressure

good for backfill because of low lateral pressure

good for backfill because of high shear strength

none of these

22. Residual soils are formed by

none of these

water

wind

glaciers

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

zero

negative

non-plastic (NP)

1

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

0.6

0.95

0.4

1.20

25. 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

less than specific gravity of soil

independent of specific gravity of soil

greater than specific gravity of soil

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

air content

percentage air voids

voids ratio

porosity

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

over-consolidated clay with a low over-consolidation ratio

under-consolidated clay

over-consolidated clay with a high over-consolidation ratio

normally consolidated clay

28. Unconfined compressive strength test is

consolidated undrained test

drained test

undrained test

consolidated drained test

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

electro-osmosis method

deep well system

vacuum method

well point system

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

semi-solid state

solid state

liquid state

plastic state

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31. At liquid limit, all soils possess

same shear strength of large magnitude

different shear strengths of large magnitude

different shear strengths of small magnitude

same shear strength of small magnitude

32. 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

33. Sensitivity of a soil can be defined as

none of these

percentage of volume change of soil under saturated condition

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

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

16

9

6

3

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

partially saturated soil

air entrained soil

dehydrated soil

dry soil

36. Degree of consolidation is

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 square of drainage path and inversely proportional to time

directly proportional to time and inversely proportional to drainage path

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

kaolinite

illite

montmorillonite

none of these

38. A fully saturated soil is said to be

three phase system

two phase system with soil and water

one phase system

two phase system with soil and air

39. Coefficient of permeability of soil

increases with the decrease in temperature

does not depend upon temperature

increases with the increase in temperature

none of these

40. Uniformity coefficient of a soil is

always less than 1

always equal to 1

equal to or greater than 1

equal to or less than 1

Geotechnical Engineering MCQs Set-2

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