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Q5 (IAS/2016) Science & Technology › ICT, AI, Cybersecurity & Emerging Tech › Wireless communication technologies Official Key

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.

Result
Your answer: —  ·  Correct: C
Explanation

The correct answer is option C because both statements about LiFi are correct.

LiFi is a wireless optical networking technology that uses light emitting diodes (LEDs) for transmission [1]of data. This confirms that Statement 1 is correct - LiFi uses light as the medium for data transmission. Li-Fi is a visible light communication technology useful to obtain high speed wireless communication.[2]

Regarding Statement 2, the documents clearly establish that LiFi is indeed wireless and significantly faster than WiFi. Li-Fi provides better bandwidth, efficiency, connectivity and security than Wi-Fi and has already achieved high speeds larger than 1 Gbps under the laboratory conditions.[3] Additionally, Li-Fi has achieved data transmission speeds of 10 Gbps and even 224 Gbps with room-scale coverage.[4] Since typical WiFi speeds are in the range of hundreds of Mbps, LiFi's speeds of several Gbps are indeed "several times faster" than WiFi, making Statement 2 correct as well.

Therefore, both statements 1 and 2 are correct, making option C the right answer.

Sources
  1. [1] https://www.tec.gov.in/pdf/Studypaper/lifi%20study%20paper%20-%20approved.pdf
  2. [2] https://www.tec.gov.in/pdf/Studypaper/lifi%20study%20paper%20-%20approved.pdf
  3. [3] https://www.tec.gov.in/pdf/Studypaper/lifi%20study%20paper%20-%20approved.pdf
  4. [4] https://en.wikipedia.org/wiki/Li-Fi
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PROVENANCE & STUDY PATTERN
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Don’t just practise – reverse-engineer the question. This panel shows where this PYQ came from (books / web), how the examiner broke it into hidden statements, and which nearby micro-concepts you were supposed to learn from it. Treat it like an autopsy of the question: what might have triggered it, which exact lines in the book matter, and what linked ideas you should carry forward to future questions.
Q. With reference to 'LiFi', recently in the news, which of the following statements" is/are correct? 1. It uses light as the medium for hi…
At a glance
Origin: Books + Current Affairs Fairness: Low / Borderline fairness Books / CA: 3.3/10 · 3.3/10
You're seeing a guest preview. The Verdict and first statement analysis are open. Login with Google to unlock all tabs.

This is a classic 'Emerging Tech' question derived directly from Science & Tech current affairs (2015-16 hype cycle). While static books explain the physics of light, they do not cover 'LiFi' specifically. The strategy is simple: if a new tech acronym appears in headlines promising to replace an old standard (WiFi), memorize its medium (Light vs Radio) and its primary advantage (Speed).

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
Does LiFi use light (visible light or optical spectrum) as the medium for high-speed data transmission?
Origin: Direct from books Fairness: Straightforward Book-answerable
From standard books
Indian Economy, Nitin Singhania .(ed 2nd 2021-22) > Chapter 15: Infrastructure > National Optical Fibre Network (NOFN) > p. 463
Presence: 5/5
“• The project envisages an optimal mix of optical fibre, radio and satellite media. ۰• The aim is to establish a highly scalable network infrastructure accessible on non-discriminatory basis, affordable broadband connectivity of 2 Mbps to 20 Mbps for all households. Till August 2019, 1.25 lakh GPs were already connected with high-speed broadband connectivity under BharatNet.”
Why this source?
  • Explicitly lists 'optical fibre' as one of the media used in a project to provide high‑speed broadband connectivity.
  • Links optical media to delivery of high‑speed broadband, showing light-based channels are used for data transmission in networks.
Science-Class VII . NCERT(Revised ed 2025) > Chapter 11: Light: Shadows and Reflections > Activity 11.1: Let us investigate > p. 156
Presence: 3/5
“Caution — Use a laser only under teachers' supervision. Avoid using high-power lasers for this activity; a low-power laser pointer is suffi cient. Never point the laser beam directly at anyone's eyes, as it can cause serious eye damage. Pass a laser beam through a beaker fi lled with water in which a drop of milk is added to make the laser beam easily visible. What do you observe? Do you see that the beam of laser light inside water follows a straight path? However, light can sometimes even bend around corners! This is something you will learn in the higher grades.”
Why this source?
  • Describes use of a laser beam (a directed form of light) in an experiment, showing light can be generated and guided as a beam.
  • Demonstrates that visible/laser light can travel in a controlled, directed path—an attribute used in light‑based data links.
Statement analysis

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Statement analysis

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