Resistant planar is defined as which statement?

• A. Planar shear that required at least one tap to cross column and block doesn't slide easily
• B. Non planar irregular fracture
• C. Sudden crack in column
• D. Thin planar crack

Answer: (A)

The key idea here is movement along a flat interface that is not free to slide—the surface resists shear. A resistant planar is one where a planar contact can carry load but doesn’t allow easy sliding; it needs an extra nudge to overcome the friction or cohesion holding the pieces in place.

That’s why the option describing planar shear that requires at least one tap to cross a column and where the block doesn’t slide easily best fits. It captures the sense of a planar surface that can bear force yet resists movement without a bit of additional impulse.

The other statements describe different situations: a non-planar irregular fracture isn’t a flat, sliding interface; a sudden crack in a column is a brittle break rather than a resisted plane of shear; and a thin planar crack doesn’t by itself imply resistance to sliding along the plane.