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GS Paper IUPSC Prelims 2000
Health & Medicine
Question No. 267Interactive Test Mode
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+2-0.66

Q267. When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of:

When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of:

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 2000 • Science and Technology

Correct Answer: Option (D) — refraction, diffraction and transmission

Concept & Option Breakdown

Standard Reference Verified

A compact disc features finely spaced concentric microscopic spiral tracks that act as a reflective diffraction grating. When sunlight strikes the CD, diffraction splits white light into spectral components. Additionally, light refracts through the clear polycarbonate protective layer and undergoes partial transmission and reflection, collectively producing the rainbow colors.

Elimination Heuristic & Exam Approach

The microscopic spiral tracks on a CD create diffraction, combined with refraction through the protective plastic layer.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2000 (Q267)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — refraction, diffraction and transmission

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Master the Science and Technology syllabus cluster by practicing these related previous year questions.

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Frequently Asked Questions — UPSC Prelims 2000 Q267

What is the official answer for UPSC Prelims 2000 GS Paper I Question 267 (Science and Technology)?

The official UPSC answer key for this 2000 Science and Technology (Health & Medicine) question is Option (D): "refraction, diffraction and transmission". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2000 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?

The microscopic spiral tracks on a CD create diffraction, combined with refraction through the protective plastic layer.

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