Building Construction
Auger boring

All of these
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground
Is generally employed in cohesive and other self soils above water table

ANSWER DOWNLOAD EXAMIANS APP

Building Construction
Rotary drilling

Hinders the ground water observations and permeability test
Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
All listed here

ANSWER DOWNLOAD EXAMIANS APP