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

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

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Building Construction
Negative skin friction

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

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