Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

Stress distribution on the failure plane, is non uniform
None of these
It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible

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Soil Mechanics and Foundation
The total discharge from two wells situated near to each other is

equal to larger of the two discharges from individual wells
less than the sum of the discharges from individual wells
greater than the sum of the discharges from individual wells
sum of the discharges from individual wells

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