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UPSC 2011: What is the difference between Bluetooth and Wi-Fi devices?
(a)Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band
(b)Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only
(c)When information is transmitted between two devices using Bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other
(d)The statements (a) and (b) given above are correct in this context
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Not attemptedCorrect Answer: (a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band
Bluetooth operates only in the unlicensed 2.4 GHz ISM band, while Wi-Fi (IEEE 802.11) can operate in 2.4 GHz and 5 GHz bands (and, in some versions, 6 GHz). Statements (b) and (c) are incorrect: Bluetooth is meant for PANs, not exclusively WLANs, and it is a radio technology that does not require line-of-sight. Therefore only statement (a) is correct—option (a). ([gktoday.in](https://www.gktoday.in/solution-of-the-upsc-prelims-2011-general-studies-paper/))
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What is the correct answer to this UPSC 2011 Science & Technology question?▼
The correct answer is option (a): Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Computer & Information Technology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2011, GS Paper 1, as Question 57. It falls under Science & Technology > Computer & Information Technology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Computer & Information Technology?▼
UPSC has asked 50 questions from Computer & Information Technology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.