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GS Paper IUPSC Prelims 2011
Health & Medicine
Question No. 84Interactive Test Mode
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+2-0.66

Q84. What is the difference between Bluetooth and Wi-Fi devices?

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

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2011 • Science and Technology

Correct Answer: Option (A) — Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band

Concept & Option Breakdown

Standard Reference Verified

Option (a) is correct: Bluetooth operates within the 2.4 GHz ISM band. Wi-Fi operates in both the 2.4 GHz and 5 GHz frequency bands (as well as 6 GHz in newer standards). Option (b) is incorrect: Bluetooth forms Personal Area Networks (PANs), while Wi-Fi forms Wireless Local Area Networks (WLANs). Neither is designed as a Wireless Wide Area Network (WWAN). Option (c) is incorrect: Neither Bluetooth nor Wi-Fi requires a direct line of sight since both use radio frequency signals that can pass through non-metallic obstacles.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2011 (Q84)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — (a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band

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Frequently Asked Questions — UPSC Prelims 2011 Q84

What is the official answer for UPSC Prelims 2011 GS Paper I Question 84 (Science and Technology)?

The official UPSC answer key for this 2011 Science and Technology (Health & Medicine) question is Option (A): "(a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2011 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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