Which of the following is a form of gate that allows one person to pass at a time?

Question

Options

• ABiometric
• BMan-trap
• CTurnstile
• DFence

• A
  2% (1)
• B
  2% (1)
• C
  91% (53)
• D
  5% (3)

Explanation

A turnstile is a rotating mechanical gate designed to allow exactly one person to pass through at a time, making it a common physical access control mechanism in subway stations, stadiums, and secure facilities. A biometric system is an authentication method (fingerprint, retina scan, etc.), not a physical gate structure. A man-trap (also called an airlock or sally port) is a small enclosed room with two interlocking doors - it can hold multiple people and is used to prevent tailgating, but it's not a single-passage gate. A fence is a perimeter barrier, not a controlled entry point for individuals.

Memory tip: Think of a turnstile as a "turn one at a time" gate - the word itself hints at rotation and singular passage, like those you spin through at a subway entrance.

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