Which of the following statements is false regarding LED (light-emitting diode)?
- ALED light sources consume less energy.
- BLEDs last longer than light bulbs.
- CLEDs use mercury, which is harmful to humans.
- DLEDs are used in traffic signal lights.
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (c) LEDs use mercury, which is harmful to humans.
Explanation
LEDs do not contain mercury: they are made of semiconductors such as gallium compounds. Fluorescent tubes and CFLs are the lamps that contain mercury.
The other statements are true: LEDs use little energy, last much longer than ordinary bulbs and are used in traffic signals.