Building Construction
Depth of lean concrete bed placed at the bottom of a wall footing, is kept

Equal to its projection beyond wall base
Less than its projection beyond wall base
10 cm
15 cm

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Building Construction
Auger boring

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

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