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GS Paper IUPSC Prelims 2019
Health & Medicine
Question No. 72Interactive Test Mode
00:00
+2-0.66

Q72. With reference to communications technologies, what is/are the difference/differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)? 1. LTE is commonly marketed as 3G and VoLTE is commonly marketed as advanced 3G. 2. LTE is data-only technology and VoLTE is voice-only technology. Select the correct answer using the code given below.

With reference to communications technologies, what is/are the difference/differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)?

  1. LTE is commonly marketed as 3G and VoLTE is commonly marketed as advanced 3G.
  2. LTE is data-only technology and VoLTE is voice-only technology. Select the correct answer using the code given below.
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 2019 • Science and Technology

Correct Answer: Option (D) — Neither 1 nor 2

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is incorrect: Both LTE and VoLTE are 4G (Fourth Generation) mobile communication standards, not 3G technologies.

Statement 2 is incorrect: LTE is designed to transmit high-speed packet data; standard LTE networks support voice through circuit-switched fallback (CSFB) to legacy 2G/3G networks. VoLTE enables voice calls to be transmitted as packet data directly over the 4G LTE IP network without falling back to 2G/3G, while concurrently sustaining active high-speed data sessions.

Elimination Heuristic & Exam Approach

Both statements make factually inaccurate oversimplifications: 4G is LTE (not 3G), and VoLTE allows seamless simultaneous voice and high-speed data transmission rather than being 'voice-only'.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2019 (Q72)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — Neither 1 nor 2

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Frequently Asked Questions — UPSC Prelims 2019 Q72

What is the official answer for UPSC Prelims 2019 GS Paper I Question 72 (Science and Technology)?

The official UPSC answer key for this 2019 Science and Technology (Health & Medicine) question is Option (D): "Neither 1 nor 2". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2019 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?

Both statements make factually inaccurate oversimplifications: 4G is LTE (not 3G), and VoLTE allows seamless simultaneous voice and highspeed data transmission rather than being 'voiceonly'.

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