Discussion
Assertion (A): Progressive failure is a particular risk with interlocking armour units.
Reason (R): Loss of interlock at one point transfers load to the neighbouring units.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. In an interlocking system each unit is held by its neighbours, so the loss of one transfers its share of the load to those around it, which are then more likely to move in turn. Damage therefore accelerates once it begins, in contrast with rock armour, which loses units one at a time and gives warning. It is the reason interlocking systems are designed for no damage rather than for a tolerated level.
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