SSC JE 2019-20: Soil Mechanics Quiz -12 for ESE & GATE CE Exams

Question 1

A fill having volume of 150000 m³ is to be constructed at a void ratio of 0.8. The borrow pit solid has a void ratio of 1.4. The volume of soil required to be excavated from the borrow pit will be

Question 2

Statement (I): In a consolidation test, pressure on the soil specimen in doubled at each step.
Statement (II): It is intended that the soil always remains in a normally consolidated condition.

Question 3

Statement (I): When a tube well penetrates into a homogenous aquifer and is then pumped, there will occur lowering of water surface. The resultant surface is designated as ‘Drawdown curve’.
Statement (II): Since the pressure on the surface of the ‘Drawdown curve’ is always at atmospheric level, it is called by this name .

Question 4

Arrange the following soils with respect to increasing order of realizable friction ratio:
(i) Loose gravel fill
(ii) Sands or gravels
(iii) Clay and mixtures and silts
(iv) Clays and peats

Question 5

For an unconfined aquifer, the specific yield is 20%, specific retention is 15%, and coefficient of permeability is 35 m/day. Consider the following statements:
1) The porosity of the aquifer is 35%.
2) The transmissibility is 35 m2 /day.
3) The volume of water lost from storage per metre drop in the water table per 100 km2 area of the aquifer is 20 million m³.
Which of the above statements are correct?

Question 6

Consider the following assumptions as regards field permeability test:
1) The flow is laminar and Darcy’s law is valid.
2) The flow is horizontal and uniform at all the points in the vertical section.
3) The velocity of flow is proportional to the ‘tangent magnitude’ of the hydraulic gradient.
Which of the above assumptions are correct?

Question 7

In a three-layered soil system, the thicknesses of the top and bottom layers each are half the thickness of the middle layer. The coefficients of permeability of the top and bottom layers each are double the coefficient of permeability k of the middle layer. When horizontal flow occurs, the equivalent coefficient of permeability of the system will be

Question 8

A uniform collapsible sand stratum, 2.5 m thick, has specific gravity of its sand as 2.65, with a natural void ratio of 0.65. The hydraulic head required to cause quick collapsible sand condition is __ m.

Question 9

The laboratory test on a sample yielded the following result:
Plasticity index : 32%
Liquidity index : 0.15
Activity number : 1.58
Which of the following inferences can be drawn
1). The soil is very stiff.
2). The soil is medium soft
3). The soil is highly plastic
4). The soil is medium plastic
5). The soil is active

Question 10

For the classification of a soil to be in semi-solid state, the Relative consistency and the Liquidity Index should be