Building Construction
Pick up the commonly adopted geophysical method in civil engineering from the following:

Gravitational method
The seismic method
Electrical resistivity method
Both (A) and (B) of the above

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Building Construction
Negative skin friction

Both (A) and (B)
Develops due to lowering of ground water
Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Neither (A) not (B)

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