Building Construction
The lintels are preferred to arches because

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

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Building Construction
Pick up the correct statements from the following:

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

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