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SSC JE 2019-20: Soil Mechanics Quiz -7

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Question 1

Which one of the following equations correctly gives the relationship between the specific gravity of soil grains (G) and the hydraulic gradient (i) to initiate ‘quick’ condition in sand having a void ratio of 0.5?

Question 2

choose the correct statement(s) with respect to Yield stress
i. Locus of the stress at which a soil yields
ii. Soil responds elastically below yield stress
iii. Soil responds elastically at yield stress
iv. Soil responds elasto-plastically beyond yield stress

Question 3

The deep clay deposit in Fig. has unit weight γ = 35 kN/m3 and the soil remains saturated even if the pore pressures become negative. For the groundwater conditions, water table 6m below ground level the vertical effective stress is

Question 4

A soil stratum (G = 2.6, e = 0.41) has water table at a depth 3m from the ground level and the capillary rise is 1m above the water table. The effective stress at a depth of 2.5m below the ground level is (Take  =10 kN/).

Question 5

For a soil element shown in the figure, the equipotential line represents 1.2 m head loss and the saturated unit weight of the fill is 21 kN/m3. The effective vertical stress (in kN/m2) at P before and after drawdown are respectively
[Take ]

Question 6

The settlement of the soil particles is a function of
i. Intergranular stress
ii. Effective stress
iii. Pore water pressure
iv. Neutral stress

Question 7

The water table is at a depth of 6m in silty soil mass. The effective diameter of the soil mass is 0.07mm. Assume void ratio is 0.57 and C= 0.25 cm2.The capillary rise of water in cm above the water table will be

Question 8

An elastic medium carries at its surface a uniform load of 10 t/m2 (~ 100 Kpa) covering a rectangular area of 4m x 3m. Find the vertical pressure at a depth of 5m below the center and corner of the loaded area. Assume influence factor of equal Quadrant is 0.0474 and influence factor for the point located at the corners of loaded area is 0.1247

Question 9

A 10 m thick clay layer is under lain by a sand layer of 20 m depth (see figure below). The water table is 5 m below the surface of clay layer. The soil above the water table is capillary saturated. The value of gtat is 19 kN/m3. The unit weight of water is gw. If now the water table rises to the surface, the effective stress at a point P on the interface will

Question 10

Which of following statement is NOT true in the context of capillary pressure in soils?

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May 27ESE & GATE CE