Geotechnical Engineering MCQs Set-2

Page 1 of 4

1. Coefficient of consolidation of a soil is affected by

compressibility

both compressibility and permeability

none of these

permeability

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

sand

clayey silt

clay

silt

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

dehydrated soil

air entrained soil

dry soil

partially saturated soil

4. Residual soils are formed by

wind

water

glaciers

none of these

5. Unconfined compressive strength test is

drained test

consolidated undrained test

undrained test

consolidated drained test

6. 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

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

over-consolidated clay with a low over-consolidation ratio

under-consolidated clay

normally consolidated clay

over-consolidated clay with a high over-consolidation ratio

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

voids ratio

porosity

air content

percentage air voids

9. Phreatic line in an earthen dam is

elliptical

parabolic

circular

straight line

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

illite

montmorillonite

kaolinite

none of these

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11. Coefficient of permeability of soil

increases with the increase in temperature

does not depend upon temperature

increases with the decrease in temperature

none of these

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

negative

1

zero

non-plastic (NP)

13. 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

14. Rate of consolidation

is independent of temperature

increases with increase in temperature

is unaffected by permeability of soil

increases with decrease in temperature

15. 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

16. A fully saturated soil is said to be

three phase system

two phase system with soil and water

two phase system with soil and air

one phase system

17. Time factor for a clay layer is

directly proportional to permeability of soil

independent of thickness of clay layer

inversely proportional to drainage path

a dimensional parameter

18. The effect of cohesion on a soil is to

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

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

19. Coarse grained soils are best compacted by a

drum roller

sheep's foot roller

vibratory roller

rubber tyred roller

20. Sand particles are made of

rock minerals

illite

montmorillonite

kaolinite

Page 3 of 4

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

9

3

16

6

22. Toughness index is defined as the ratio of

plasticity index to consistency index

liquidity index to flow index

plasticity index to flow index

consistency index to liquidity index

23. 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

less than specific gravity of soil

equal to specific gravity of soil

independent of specific gravity of soil

24. 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

plastic state

semi-solid state

25. Degree of consolidation is

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

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

1.20

0.6

0.95

0.4

27. Inorganic soils with low compressibility are represented by

CH

MH

SL

ML

28. At liquid limit, all soils possess

different shear strengths of large magnitude

same shear strength of large magnitude

different shear strengths of small magnitude

same shear strength of small magnitude

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

plasticity index

liquid limit

shrinkage limit

plastic limit

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

gravel

silt

sand

clay

Page 4 of 4

31. 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

32. Cohesive soils are

none of these

good for backfill because of high shear strength

good for backfill because of low lateral pressure

poor for backfill because of large lateral pressure

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

vacuum method

electro-osmosis method

deep well system

well point system

34. 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

35. The shear strength of a soil

decreases with increase in normal stress

decreases with decrease 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

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

effective stress only

total stress only

both effective stress and total stress

none of these

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

uniformity coefficient

coefficient of curvature

none of these

effective size

38. A pycnometer is used to determine

voids ratio and dry density

water content and voids ratio

specific gravity and dry density

water content and specific gravity

39. 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

greater than 0.2 mm

all of these

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

drift

loess

dune sand

talus

Geotechnical Engineering MCQs Set-2

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