Building Construction
The type of roof suitable in plains where rainfall is meagre and temperature is high is

None of these
Pitched and sloping roof
Flat roof
Shell roof

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Building Construction
During percussion drilling

All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
Caving or mixing of strata are caused in soft soils or cohesion-less soils
The soil to a considerable depth below the bottom of the hole gets disturbed

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