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UPSC PYQPrelims 2020

Civil Services Examination · Question 39

With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2. VLC is known as long-range optical wireless communication. 3. VLC can transmit large amounts of data faster than Bluetooth. 4. VLC has no electromagnetic interference. Select the correct answer using the code given below:

  1. 1, 2 and 3 only
  2. 1, 2 and 4 only
  3. 1, 3 and 4 only
  4. 2, 3 and 4 only
Show answer & explanation

Answer: (C) 1, 3 and 4 only

Explanation

VLC uses visible light (~375–780 nm), is faster than Bluetooth and free from EM interference, but it is a short-range technology.