North Carolina Locksmith Practice Exam

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What characterizes a double cylinder lock?

It has two distinct entry points
It can be locked from both sides using keys
It includes a biometric entry
It operates without any keys

The correct answer is: It can be locked from both sides using keys

A double cylinder lock is characterized by its ability to be locked from both sides using keys. This means that there is a keyhole on both the exterior and the interior side of the lock, allowing full control of the locking mechanism from either side. This feature provides additional security, especially in situations where a door may have glass panels nearby; in such cases, a potential intruder might break the glass and reach in to unlock a single-cylinder lock from the inside. With a double cylinder lock, both sides require a key for locking or unlocking, adding an extra layer of protection. The other options do not accurately describe the characteristics of a double cylinder lock. For instance, stating it has two distinct entry points is misleading; while the lock itself may have two entry points for inserting keys, this doesn't define the type of lock. Similarly, a lock that includes a biometric entry or operates without any keys does not describe a double cylinder lock, as these features pertain to different types of locking systems altogether.