Question

Where are you most likely to find a Bench Mark (BM) in the real world?

• A. On a temporary wooden fence
• B. At the bottom of a moving sand dune
• C. In the middle of a rugged, unsurveyed forest
• D. Cut into a bridge pillar or stone building wall

Answer 1

Answer:

D. Cut into a bridge pillar or stone building wall

• They are permanent reference points often etched into stable, lasting structures like bridges or main buildings. • Bench Marks are placed on infrastructure because they serve as the foundational vertical control for a region, requiring a surface that will not shift, sink, or erode over decades of environmental exposure.