UPSC Prelims 2011·GS1·science-and-technology·it and communication

What is the difference between Bluetooth and Wi-Fi devices?

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Last updated 23 May 2026, 3:31 pm IST
  1. ABluetooth uses 2-4 GHz radio frequency band, whereas Wi-Fi can use 2-4 GHz or 5 GHz frequency bandCorrect
  2. BBluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only
  3. CWhen 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
  4. DThe statements (a) and (b) given above are correct in this context

Explanation

The correct option is A because of the specific radio frequency bands these technologies utilize. Bluetooth operates globally on the 2.4 GHz short range radio frequency band. In contrast, Wi-Fi is more versatile and can operate on both the 2.4 GHz and 5 GHz bands to provide higher data speeds and reduce interference. Option B is incorrect because Bluetooth is primarily for Wireless Personal Area Networks WPAN while Wi-Fi is for Wireless Local Area Networks WLAN. Neither is designed for Wide Area Networks WWAN. Option C is incorrect because neither technology requires a direct line of sight to function; they both use radio waves that can pass through obstacles like walls. Option D is incorrect because only statement A is scientifically accurate.
science-and-technology: What is the difference between Bluetooth and Wi-Fi devices?
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