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UPSC Prelims 2020 Paper-1 📅 04 Oct, 2020

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:

A
1, 2 and 3 only
B
1, 2 and 4 only
C
1, 3 and 4 only
D
2, 3 and 4 only
Result Summary
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UPSC Prelims
2020 • 04 Oct, 2020 • Paper-1
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:
Correct Answer
1, 3 and 4 only
Spectrum Range: Visible Light Communication utilizes the visible light band of the electromagnetic spectrum, which corresponds to wavelengths spanning approxima......
Ref/Book : UPSC Prelims 2020
Ref. Subject Science & Technology
Chapter -
Ref. Topic Emerging Technologies
Pg. No -
💡 Analysis & Explanation
Spectrum Range ▼
Visible Light Communication utilizes the visible light band of the electromagnetic spectrum, which corresponds to wavelengths spanning approximately from 375/400 nm to 700/780 nm. Statement 1 is correct.
Range Capability ▼
Because it relies on visible light, VLC requires a line of sight and cannot penetrate opaque obstacles like walls. Consequently, it is strictly a short-range optical wireless communication technology, not long-range. Statement 2 is incorrect.
Speed Comparison ▼
VLC (commercially dubbed Li-Fi) boasts a much wider bandwidth compared to radio frequencies, allowing it to transmit immense data loads at gigabit speeds, vastly outperforming Bluetooth. Statement 3 is correct.
Interference Advantage ▼
Since VLC utilizes light waves instead of radio waves, it is immune to traditional electromagnetic interference (EMI), making it safe for use in hospitals and airplane cabins. Statement 4 is correct.
Conclusion ▼
Statements 1, 3, and 4 accurately describe VLC.
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