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### Civil Engineering :: Soil Mechanics and Foundation

1. The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to

2.  A.  1.0m B.  1.5m C.  2.0m D.  3m

3. Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is

4.  A.  3 months B.  6 months C.  12 months D.  24 months

5. Degree of consolidation is

6.  A.  directly proportional to time and inversely proportional to drainage path B.  directly proportional to time and inversely proportional to square of drainage path C.  directly proportional to drainage path and inversely proportional to time D.  directly proportional to square of drainage path and inversely proportional to time

7. Select the correct range of density index,1D

8.  A.  1D > 0 B.  ID > 0 C.  0 < 1D < 1 D.  0 ≤ 1D ≤ 1

9. For a loose sand sample and a dense sand sample consolidated to the same effective stress

10.  A.  ultimate strength is same and also peak strength is same B.  ultimate strength is different but peak strength is same C.  ultimate strength is same but peak strength of dense sand is greater than that of loose sand D.  ultimate strength is same but peak

11. Within the consolidation process of a saturated clay

12.  A.  a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant B.  a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant C.  both neutral pressure and effective pressure decrease D.  both neutral pressure and effective pressure increase

13. Rise of water table in cohesionless soils upto ground surface reduces the net ultimate bearing capacity approximately by

14.  A.  25% B.  50% C.  75% D.  90%

15. Terzaghi’s bearing capacity factors Nc, Nq and Nr are functions of

16.  A.  cohesion only B.  angle of internal friction only C.  both cohesion and angle of internal friction D.  none of the above

17. Valid range for S, the degree of saturation of soil in percentage is

18.  A.  S > 0 B.  S < 0 C.  0 < S < 100 D.  0 ≤ S ≤ 100

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

20.  A.  liquid state B.  plastic state C.  semi-solid state D.  solid state