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GS Paper IUPSC Prelims 2003
Health & Medicine
Question No. 258Interactive Test Mode
00:00
+2-0.66

Q258. Diffusion of light in the atmosphere takes place due to:

Diffusion of light in the atmosphere takes place due to:

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 2003 • Science and Technology

Correct Answer: Option (B) — dust particles

Concept & Option Breakdown

Standard Reference Verified

Atmospheric diffusion and scattering of light into shadows and broad daylight is primarily caused by suspended aerosol particulates and dust particles (Mie scattering), whose dimensions are comparable to or larger than optical wavelengths.

Elimination Heuristic & Exam Approach

Particulate matter/dust acts as physical scattering centers in the lower atmosphere, causing diffuse illumination.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2003 (Q258)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — dust particles

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Frequently Asked Questions — UPSC Prelims 2003 Q258

What is the official answer for UPSC Prelims 2003 GS Paper I Question 258 (Science and Technology)?

The official UPSC answer key for this 2003 Science and Technology (Health & Medicine) question is Option (B): "dust particles". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2003 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?

Particulate matter/dust acts as physical scattering centers in the lower atmosphere, causing diffuse illumination.

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