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GS Paper IUPSC Prelims 1996
Climatology & Atmosphere
Question No. 72Interactive Test Mode
00:00
+2-0.66

Q72. Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?

Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?

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 1996 • Geography

Correct Answer: Option (D) — Ionosphere

Concept & Option Breakdown

Standard Reference Verified

The Ionosphere contains a high concentration of electrically charged ions and free electrons formed by the ionization of atmospheric gases by solar UV and X-ray radiation. These ionized layers (D, E, F1, and F2 layers) reflect and deflect high-frequency radio waves back to Earth, enabling long-distance skywave radio communication.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1996 (Q72)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicGeography → Climatology & Atmosphere
Official Answer KeyOption (D) — Ionosphere

Related & Repeated Prelims PYQs (2)

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1998 • Q6885% Match

The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is:

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2011 • Q21185% Match

A layer in the Earth’s atmosphere called Ionosphere facilitates radio communication. Why? 1. The presence of ozone causes the reflection of radio waves to Earth

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Frequently Asked Questions — UPSC Prelims 1996 Q72

What is the official answer for UPSC Prelims 1996 GS Paper I Question 72 (Geography)?

The official UPSC answer key for this 1996 Geography (Climatology & Atmosphere) question is Option (D): "Ionosphere". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1996 question belong to?

This question belongs to GS Paper I under the subject "Geography" and micro-topic "Climatology & Atmosphere". You can explore all repeated questions from Climatology & Atmosphere 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 Climatology & Atmosphere UPSC Prelims question using option elimination?

To solve Climatology & Atmosphere 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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