Four questions. Five answers. Which one doesn't belong?

The five answers

Bluetooth
GPS
Radar
Sonar
Wi-Fi

The questions

Which technology was developed before World War II to detect distant objects using reflected radio waves?
Which technology uses sound waves to detect and locate objects underwater?
Which technology was named after a 10th-century Scandinavian king known for uniting Denmark and Norway?
Which technology was originally developed by the U.S. military and uses satellites to determine a receiver’s location?

Reveal the answers

Radar
Sonar
Bluetooth
GPS

The False Five: Wi-Fi

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