Soil Mechanics and Foundation Engineering

31. A soil has bulk density 2.30 g/cm³ and water content 15 per cent, the dry density of the sample, is

1. 1.0 g/cm²
2. 1.5 g/cm³
3. 2.0 g/cm³
4. 2.5 g/cm³

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32. A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces 299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that of paraffin 0.9, the void ratio of soil, is

1. 0.55
2. 0.6
3. 0.65
4. 0.7

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33. A soil mass is said to be in plastic equilibrium if

1. It is stressed to maximum
2. It is on the verge of failure
3. It is in plastic stage
4. It starts flowing

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34. A soil not fully consolidated under the existing over-burden pressure, is called

1. Pre-consolidated
2. Normally consolidated
3. Over-consolidated
4. None of these

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35. A soil sample has passing 0.075 mm sieve = 60% liquid limit = 65% and plastic limit = 40%. The group index of the soil, is

1. 5
2. 20
3. 40
4. None of these

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36. A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the degree of saturation, is

1. 0.954
2. 0.955
3. 0.956
4. 0.957

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37. A soil sample of mass specific gravity 1.92 has moisture content 30%. If the specific gravity of solids is 2.75, the void ratio, is

1. 0.858
2. 0.86
3. 0.862
4. 0.864

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38. A stratum of clay 2 m thick will get consolidated 80% in 10 years. For the 80% consolidation of 8 m thick stratum of the same clay, the time required is

1. 100 years
2. 120 years
3. 140 years
4. 160 years

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39. A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm² per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required

1. 3233
2. 3123
3. 33331
4. 3313

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40. A suspended particle falls through a height'H' cm in watere in 't' minutes. If the viscosity of water is 'n' and specific gravity of the particle is 'G', the diameter of the particle is (where M is a constant factor)

1. 10³M √(H/t)
2. 10⁴M √(H/t)
3. 10⁵M √(H/t)
4. 10²M √(H/t)

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