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GS Paper IUPSC Prelims 2011
Health & Medicine
Question No. 209Interactive Test Mode
00:00
+2-0.66

Q209. A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD? 1. DVD supports Standard Definition video while BD supports High Definition Video. 2. Compared to a DVD, the BD format has several times more storage capacity. 3. The thickness of BD is 2.4 mm while that of DVD is 1.2 mm. Which of the statements given above is/are correct?

A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD?

  1. DVD supports Standard Definition video while BD supports High Definition Video.
  2. Compared to a DVD, the BD format has several times more storage capacity.
  3. The thickness of BD is 2.4 mm while that of DVD is 1.2 mm. Which of the statements given above is/are correct?
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 (B) — 1 and 2 only

Concept & Option Breakdown

Standard Reference Verified

Statements 1 and 2 are correct: Standard DVDs typically store 4.7 GB (single layer) in Standard Definition (SD), whereas Blu-ray discs use shorter wavelength blue-violet lasers (405 nm) to store 25 GB to 50 GB of High Definition (HD) and Ultra-HD content. Statement 3 is incorrect: Standard optical discs (CD, DVD, and Blu-ray) all share the exact same physical dimensions: 120 mm diameter and 1.2 mm thickness.

Elimination Heuristic & Exam Approach

All standard commercial optical discs (CDs, DVDs, Blu-rays) have identical physical dimensions (1.2 mm thickness) to ensure physical tray compatibility.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2011 (Q209)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 1 and 2 only

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Frequently Asked Questions — UPSC Prelims 2011 Q209

What is the official answer for UPSC Prelims 2011 GS Paper I Question 209 (Science and Technology)?

The official UPSC answer key for this 2011 Science and Technology (Health & Medicine) question is Option (B): "1 and 2 only". 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?

All standard commercial optical discs (CDs, DVDs, Blurays) have identical physical dimensions (1.2 mm thickness) to ensure physical tray compatibility.

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