Explanation
- A
1 only
Statement 1 only. LiFi does use visible or other light as the carrier, but the second claim—that it is wireless and can be many times faster than WiFi—is also treated as correct in this item. 1 alone is not the key.
- B
2 only
Statement 2 only. Speed and wireless character are right, yet the defining medium is light. Dropping 1 is not the key.
- C
Both 1 and 2
Both 1 and 2. Light Fidelity modulates LED or laser light for data. It is a wireless optical link and laboratory and vendor claims put peak rates far above typical WiFi. That stored letter is the official key.
- D
Neither 1 nor 2
Neither. Both listed statements match the LiFi idea that was in the news, so ‘neither’ is not the key.
Summary. Official key is (c) both 1 and 2. LiFi is optical wireless communication: photons instead of radio. It can be very fast in line-of-sight LED/laser setups and does not replace radio where walls block light. Honour the stored letter (c).
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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2022 · Q36 · General Studies · 2 marks
Consider the following communication technologies: 1. Closed-circuit Television 2. Radio Frequency Identification 3. Wireless Local Area Network Which of the above are considered Short Range devices/technologies? -
2025 · Q88 · General Studies · 2 marks
Consider the following statements: I. If any question arises as to whether a Member of the House of the People has become subject to disqualification under the 10th Schedule, the President's decision in accordance with the opinion of the Council of Union Ministers shall be final. II. There is no mention of the word 'political party' in the Constitution of India. Which of the statements given above is/are correct?