Building Construction
A pointed arch which forms isosceles or equilateral triangle, is generally known as

Two centered arch
Bull's eye arch
Three centered arch
Lancet arch

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Building Construction
Negative skin friction

Neither (A) not (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
Both (A) and (B)

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