Did you ever think why your door key opens only your lock, and each of your neighbors' keys opens only each of theirs -- but the superintendent can open everyone's locks? How many keys does he carry anyway? The key to this question is in this quiz.
Question 1 of 10
If a large apartment building has a hundred apartments, how many keys does the superintendent need to open the doors?
Question 2 of 10
What is the most common lock design?
Question 3 of 10
What happens when you turn the cylinder in a cylinder lock?
Question 4 of 10
Using the correct key to open a cylinder lock is comparable to:
Question 5 of 10
What are the main components of a pin and tumbler lock?
Question 6 of 10
How are the pins grouped together?
Question 7 of 10
What keeps the plug from turning?
Question 8 of 10
What is meant by the term, the shear line?
Question 9 of 10
In locks of a specific group that can be opened by a master, some pin pairs are separated by a third pin. What is this third pin called?
Question 10 of 10