Soil Mechanics and Foundation Engineering (General Engineering) (SSC JE)

Total Questions: 50

21. The bulk modulus of water with respect to air is how many times? [RSMSSB JE (E & M) Degree- 20.05.2022]

Correct Answer: (d) 20,000 times
Solution:

22. Determine plasticity index if the liquid limit and plastic limit is 40% and 20% respectively. [BPSC AE (Civil) 25.03.2022 ]

Correct Answer: (b) 20%
Solution:

23. Rotary boring method is used for drilling [BPSC AE (Civil) 25.03.2022 ]

Correct Answer: (b) unconsolidated strata
Solution:

Hydraulic rotary method– Sometimes known as rotary boring method is used for drilling large bores in unconsolidated strata.
• Rotary boring is only utilized for soil investigation when deep boreholes are needed in challenging formation containing boulders fractured rock or water logged sand.
• In this method by using suitable diamond studied drill bit or steel bits with shots the rock cores may be obtained. The method is than known as core boring or core drilling.

24. A clear dry sand sample is tested in direct shear test. The normal stress and the shear stress at failure are both equal to 120 kN/m² . The angle of shearing resistance of the sand will be [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (c) 45 degree
Solution:

25. An initial cross-sectional area of a clay sample was 15 cm² . The failure strain was 25% in an unconfined compression test. The corrected area of the sample at failure would be [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (b) 20 cm²
Solution:

26. Under a given load, a clay layer attains 30% degree of consolidation in 100 days. The time taken by the same clay layer to attain 60% degree of consolidation will be [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (c) 400 days
Solution:

Given, A clay layer attains 30% degree of consolidation (t₁) = 100 days Same clay layer to attain 60% degree of consolidation (t₂) · ?
We know

27. For a sandy soil, the angle of internal friction is 30 degree. If the major principal stress is 50 kN/m² at failure, then the corresponding minor principal stress (in kN/m²) will be [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (b) 16.66
Solution:

28. The unit of coefficient of consolidation is [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (b) cm²/sec
Solution:

29. Which of the following gives the correct decreasing order of the densities of a soil sample? [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (c) Saturated, wet, dry, submerged
Solution:

30. For sampling natural sands and other soft and wet soils satisfactorily, the most suitable soil sampler is [BPSC AE (Civil) 30.03.2019 ]

Correct Answer: (a) open drive thin-walled tube sampler
Solution:

Sampler–Many types of samplers are in use for extracting the soil called undisturbed samples. Only two types of samplers are described here they are–
1. Open drive sampler
2. Piston sampler.

Open drive sampler–The wall thickness of the open drive sampler used for sampling may be thin or thick according to the soil conditions met in the field. A thin walled tube sampler is called as shelby tube sampler, consists of a thin wall metal tube connected to a sampler head.
The thin wall tube which is normally formed from 1/16 to 1/8 inch metal, is drawn in at the lower end and is reamed so that the inside diameter of the cutting edge is 0.5 to 1.5 percent less than that of the inside diameter of the tube.

The thin-wall tube sampler is primarily used for sampling in soft to medium stiff cohesive soils.
Note : Option (b) is correct according to commission.