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GS Paper IUPSC Prelims 2013
Health & Medicine
Question No. 191Interactive Test Mode
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Q191. Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 1. Dispersion 2. Refraction 3. Internal reflection Select the correct answer using the codes given below:

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?

  1. Dispersion
  2. Refraction
  3. Internal reflection Select the correct answer using the codes 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 2013 • Science and Technology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified

All three phenomena are responsible for rainbow formation: Sunlight undergoes refraction as it enters a spherical water droplet, undergoes dispersion into its constituent colors due to wavelength-dependent refraction, reflects internally off the rear surface of the droplet, and refracts again as it exits the droplet into the air.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2013 (Q191)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 2013 Q191

What is the official answer for UPSC Prelims 2013 GS Paper I Question 191 (Science and Technology)?

The official UPSC answer key for this 2013 Science and Technology (Health & Medicine) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2013 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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