Building Construction
The depth of an arch is the distance between

Crown and springing line
Intrados and extrados
Ground level and springing line
Crown and ground level

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Building Construction
Pick up the correct statements from the following:

Excessive thermal variations in the backing or plaster causes the plaster to fall
In brick work, the efflorescence is removed by applying a solution of zinc sulphate and water
Cracks appear on the plastered surface in the form of hair cracks
All listed here

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