UPSC CSE Prelims
Question 67
With reference to 'LiFi', recently in the news, which of the following statements is/are correct?
- It uses light as the medium for high-speed data transmission.
- It is a wireless technology and is several times faster than 'WiFi'.
Select the correct answer using the code given below.
View correct answer and explanation
Correct answer: C
Correct Option: C
Explanation: Li-Fi uses modulated visible light or other optical wavelengths for short-range wireless data transmission; laboratory demonstrations showed speeds exceeding traditional Wi-Fi in particular settings.
Statement/Pair-wise Analysis:
Statement/Item 1: Correct - Information is encoded in rapidly varied light intensity and received by photodetectors.
Statement/Item 2: Correct - Li-Fi is wireless optical networking and can attain very high speeds in suitable experimental conditions.
Option-wise Analysis:
A: Incorrect - omits correct statement/item 2.
B: Incorrect - omits correct statement/item 1.
C: Correct - includes all and only the true statements/items.
D: Incorrect - omits correct statement/items 1, 2.
Review Note: “Several times faster” describes potential/test conditions, not a guaranteed advantage in every real network.