Effective Stress
Effective Stress
Solved Example: 9075-01
Effective stress on soil: (ISRO Scientist Civil 2015)
A. Increases voids ratio and decreases permeability
B. Increases both voids ratio and permeability
C. Decreases both voids ratio and permeability
D. Decreases void ratio and increases permeability
Correct Answer: C
Solved Example: 9075-02
Contact pressure for flexible footing on any type of soil is: (RSMSSB JE Civil Diploma Sep 2016)
A. Uniform
B. Varies with maximum at center
C. Varies with maximum edges
D. NO specific trend of variation
Correct Answer: A
Solved Example: 9075-03
Due to rise in water table, the effective stress in soil: (UPSSSC JE Civil 2015 Paper II)
A. Increases
B. Decreases
C. Does not change
D. May increase or decrease
Correct Answer: B
Solved Example: 9075-04
What is the effective stress at a depth of 10 m below the ground level, when water table is 3 m below ground level, saturated density is 20 kN/m$^3$ and bulk density is 18 kN/m$^3$? (DSSSB JE CE Shift I Oct 2019)
A. 124 KN/m$^2$
B. 116 KN/m$^2$
C. 264 KN/m$^2$
D. 194 KN/m$^2$
Correct Answer: A
Solved Example: 9075-05
The Pore water pressure in a capillary zone is: (MPPSC AE CE 2014 Paper II)
A. Zero
B. Positive
C. Negative
D. Very low
Correct Answer: C
Solved Example: 9075-06
A flownet is drawn to obtain: (TN TRB Civil 2012)
A. Seepage, coefficient of permeability and uplift pressure
B. Coefficient of permeability, uplift pressure and exit gradient
C. Exit gradient, uplift pressure and seepage quantity
D. Exit gradient, seepage, and coefficient of permeability
Correct Answer: C
Solved Example: 9075-07
In which one of the following pairs of soil types would you anticipate negative pore pressure when subjected to shearing? (BPSC AE Paper V Civil 2012)
A. Normally consolidated clay and dense sand
B. Overconsolidated clay and loose sand
C. Less consolidated clay and overconsolidated clay
D. Dense sand and overconsolidated clay
Correct Answer: D
Solved Example: 9075-08
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: (ESE Civil 2016 Paper II)
A. 2.50 m
B. 2.75 m
C. 3.25 m
D. 3.50 m
Correct Answer: A
Solved Example: 9075-09
The pore water pressure in the soil sample of consolidometer test is: (SSC JE CE Paper I Jan 2018 Morning)
A. Maximum at bottom
B. Maximum at centre
C. Maximum at top
D. Minimum at centre
Correct Answer: B
Solved Example: 9075-10
A lake 5 m deep consist of sand bed with saturated unit weight of 20 kN/m$^3$, Determine the effective vertical stress at 5 m below the bed of the river. (take unit weight of water as 9.81 kN/m$^3$) (BHEL Engg Trainee Civil May 2019)
A. 65 KN/m$^2$
B. 51 KN/m$^2$
C. 149 KN/m$^2$
D. 100 KN/m$^2$
Correct Answer: B