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WBCS Preliminary Examination 2020 — General Studies · Question 107 of 200

Q107
General SciencePhysics
TV remote control uses
  1. a.infrared frequency
  2. b.radio frequency
  3. c.visible frequency
  4. d.ultraviolet frequency

Answer: (A) infrared frequency

TV remotes use infrared (IR) light signals, which are invisible and travel in a line of sight to the receiver.

Q106 Whole paperQ108