GS PrelimsScience and TechnologyInformation and Communication Technology2000

Which one of the following does a TV remote control unit use to operate a TV set?

Light waves

Sound waves

Micro waves

Radio waves

Correct Answer: Option A

Explanation

1. TV remote control units use wireless signals to operate a TV set. 2. The most common technology used, especially around 2000, was Infrared (Light waves), which requires line-of-sight. 3. However, some remote controls utilize Radio waves (RF), which do not require line-of-sight and can operate through obstacles. Given the options and the official answer being (D), it refers to the use of Radio waves in some remote control units. 4. Sound waves and Micro waves are generally not used for standard TV remotes.

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