Building Construction
The depth of the ground water table may be ascertained by

Measuring the depth of water in the well
Standing on the well in the vicinity
None of these
Looking through the well in the vicinity

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Building Construction
During percussion drilling

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
All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole

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