Which statement describes the phenomenon of transfer between surfaces on contact?

• A. Mutual Exchange
• B. Counterfeit
• C. Documentation
• D. Distortion

Answer: (A)

Mutual exchange describes what happens when two surfaces touch: material from each surface moves to the other. When hands press on a surface or when a surface comes into contact with another, oils, sweat, skin cells, fibers, dust, and other traces can transfer in both directions. The amount and type of transfer depend on factors like moisture, pressure, contact duration, and the roughness or porosity of the surfaces. That bidirectional transfer is exactly what “mutual exchange” conveys.

The other terms don’t fit this idea. Counterfeit means fake or forged and isn’t about transfer between surfaces. Documentation refers to recording information, not material transfer. Distortion means deformation or alteration, not the exchange of residues during contact.