With reference to 'LiFi', recently in the news, which of the following statements is/are correct?
- 1.It uses light as the medium for high-speed data transmission.
- 2.It is a wireless technology and is several times faster than 'WiFi'.
Select the correct answer using the code given below.
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Answer: C. Statement 1 is correct: LiFi (Light Fidelity) sends data using visible light from LED bulbs. Statement 2 is correct: it is wireless, and lab tests have shown speeds many times faster than WiFi. So both 1 and 2.
Watch for: Students who link 'wireless' only to radio waves wrongly think light-based data cannot be wireless.
Why the other options are wrong
- A. Wrong because LiFi is also wireless and much faster than WiFi in tests.
- B. Wrong because LiFi does use light for data transfer.
- D. Wrong because both statements describe LiFi correctly.
Source to check: Press Information Bureau and Department of Science and Technology notes on LiFi (2015-16); Harald Haas, University of Edinburgh, LiFi research
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.