Building Construction
Pick up the correct statements from the following:

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

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Building Construction
In clay soil

Consolidation continues even after several years of construction
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Swelling and shrinkage characteristics prevail
Differential settlement is generally prevalent

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
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A flap valve at the bottom of tube is provided to extract the soil sample

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