A locked door is _____ times stronger than an unlocked door.

A locked door is _____ times stronger than an unlocked door.

• A. 5
• B. 15
• C. 10
• D. 20

Answer: (C)

Locking a door adds a major mechanical barrier that dramatically increases the effort required to breach it. When a deadbolt engages a reinforced strike plate with long screws into the frame, the force from an attempted entry is redirected into sturdier anchors, making the door far harder to defeat. In security training, this increased resistance is typically estimated at about ten times stronger than an unlocked door. The exact gain depends on hardware and installation, but tenfold is the standard figure used to reflect the substantial improvement locking provides.

Locking a door adds a major mechanical barrier that dramatically increases the effort required to breach it. When a deadbolt engages a reinforced strike plate with long screws into the frame, the force from an attempted entry is redirected into sturdier anchors, making the door far harder to defeat. In security training, this increased resistance is typically estimated at about ten times stronger than an unlocked door. The exact gain depends on hardware and installation, but tenfold is the standard figure used to reflect the substantial improvement locking provides.