Building Construction
Minimum width of landing should be

Half the width of stairs
One fourth the width of stairs
Twice the width of stairs
Equal to width of stairs

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Building Construction
During percussion drilling

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

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