Building Construction
Arches in the form of masonry arcs struck from more than four centres, are called

Ogee arches
Gothic arches
Drop gothic arches
Two curved arches

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Building Construction
Rotary drilling

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

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Building Construction
Slate

Splits into thin sheets along its bedding planes
Has a smooth surface and contains alumina and silica
Is a metamorphic rock
Possesses good water absorption capacity

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