Building Construction
The lintels are preferred to arches because

All of these
Arches are difficult in construction
Arches require more headroom to span the openings like doors, windows etc.
Arches require strong abutments to withstand arch thrust

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Building Construction
Auger boring

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

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