Readiness
Direct answer
You understand Surface and subsurface indication logic when you can explain why the correct answer is right and why the tempting wrong answers fail. Use this check: Surface and subsurface indication logic is one of the core study areas for Weld Discontinuities and NDE Practice Test. If you can apply that idea across Discontinuity naming, Defect versus discontinuity, VT, PT, MT, UT, and RT selection, you are closer to test-day readiness.
How to use this answer
Read the answer once, then prove it by choosing an answer in a practice question before looking at the explanation. If the miss repeats, tag the domain as Study module and drill a smaller set before returning to mixed practice.