Multiple choice general knowledge math & puzzles

A fan always has

  1. Switch

  2. Blades

  3. Current

  4. Wire

  5. Regulator
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fan, by definition, must have blades to move air. Options like switches, wires, current, and regulators are electrical components that may or may not be present, but blades are the defining mechanical feature.

AI explanation

This is a 'defining attribute' logic question: which feature is essential/always present versus merely common? A fan, by definition, needs blades to move air -- without blades it isn't functioning as a fan. A switch, regulator, or external wire may be absent (e.g., a pull-cord fan, a fan wired directly without a separate switch, or a fixed-speed fan with no regulator), and 'current' is only present while it's running, not inherently part of its structure. Blades are the one feature that is structurally always there.

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