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Which of the following methods is used in preliminary site investigation?

A. Soil fertilization

B. Chemical etching

C. Magnet therapy

D. Resistivity survey

Answer: Option D

Solution (By Examveda Team)

Resistivity surveys are geophysical methods used to detect subsurface features. They help map groundwater, bedrock, and voids before excavation. Correct Answer: Resistivity survey.

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