Which term describes armor that does not react to incoming projectiles?

• A. Active armor
• B. Passive armor
• C. Explosive reactive armor
• D. Non-explosive reactive armor

Answer: (B)

Armor that does not react to incoming projectiles relies on its own physical properties—mass, hardness, and geometry—to stop or slow a hit without any automatic response. This inert protection is passive in nature, meaning there are no sensors, actuators, or reactive layers deployed when a threat arrives. In contrast, active armor uses sensing systems and countermeasures to respond to a threat, explosive reactive armor has an explosive layer that detonates on impact to disrupt the projectile’s jet, and non-explosive reactive armor relies on a reactive material that moves or deforms to reduce penetration. Since the question describes armor that does not react at all, the correct concept is passive armor.