WBCS.LIVE practice question

Which part of the electromagnetic spectrum is used in household TV remote controls?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Ultraviolet rays
  2. Infrared rays
  3. X-rays
  4. Gamma rays

Correct answer and explanation

Correct answer: Infrared rays

Explanation: āœ… Correct Answer: B) Infrared rays šŸ“š Explanation: Most remote controls use pulses of infrared (IR) light to send binary signals to electronic devices like televisions. Infrared radiation has a longer wavelength than visible light, making it invisible to the human eye but detectable by electronic sensors. Since IR light travels in a straight line and cannot pass through walls, it is ideal for short-range communication.