Building Construction
Raft foundation are generally preferred to when the area required for individual footing, is more than

50% of total area
40% to total area
25% to total area
30% of total area

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Building Construction
Mansard roof is a roof which slopes in

Two directions without break in the slope on each side
Four directions with break in the slope on each side
Four directions without break in the slope on each side
Two directions with break in the slope on each side

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Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
All listed here
Is not suitable for deposits containing very coarse gravel
Hinders the ground water observations and permeability test

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