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Home› UPSC CSE› Prelims GS Paper I› 2011 questions› Question 65

UPSC CSE Prelims

Subject: Technology Chapter: Information Technology (IT) And Robotics (AI)

2011 PYQ

Question 65

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

Choose one answer ABluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band BBluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only 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 DThe statements (a) and (b) given above are correct in this context

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Correct answer: A

Correct Option: A Explanation: Classic Bluetooth operates in the 2.4 GHz ISM band; Wi-Fi can operate at 2.4 or 5 GHz (and now other bands), and neither generally requires optical line of sight. Option-wise Analysis: A: Correct - the given frequency-band comparison distinguishes Bluetooth from Wi-Fi. B: Incorrect - Bluetooth is usually a personal-area technology and Wi-Fi local-area; WWAN is cellular-type coverage. C: Incorrect - Bluetooth radio communication also works without direct line of sight. D: Incorrect - Because B is false, A and B cannot both be correct. Review Note: Current Wi-Fi also uses the 6 GHz band; the option is an illustrative historical rather than exhaustive frequency statement.

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