Correct Answer:
Option A - For the unequal stresses created on account of the expansion and contraction joints provided in Hollow Block Masonry under control, controlled joints are introduced at intervals of 5 to 10 m.
A. For the unequal stresses created on account of the expansion and contraction joints provided in Hollow Block Masonry under control, controlled joints are introduced at intervals of 5 to 10 m.