RCC Structures Design
To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than

b/3
b/4
b/6
b/5

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RCC Structures Design
A pre-stressed concrete member is preferred because

All listed here
Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted

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