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GS Paper IUPSC Prelims 1998
Human & Political Geography
Question No. 68Interactive Test Mode
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+2-0.66

Q68. The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is:

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

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 1998 • Geography

Correct Answer: Option (C) — Troposphere, Stratosphere, Mesosphere, Ionosphere

Concept & Option Breakdown

Standard Reference Verified

Starting from the Earth's surface and ascending vertically, the thermal structure of the atmosphere consists of:

  1. Troposphere (surface to ~8–18 km)
  2. Stratosphere (up to ~50 km, contains the ozone layer)
  3. Mesosphere (~50 to 85 km, where meteors burn up)
  4. Ionosphere / Thermosphere (~85 to 600+ km, containing ionized gases)
Elimination Heuristic & Exam Approach

Use the standard mnemonic 'Trust Me In The Exam' or 'TSMI' (Troposphere, Stratosphere, Mesosphere, Ionosphere/Thermosphere).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1998 (Q68)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicGeography → Human & Political Geography
Official Answer KeyOption (C) — Troposphere, Stratosphere, Mesosphere, Ionosphere

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Frequently Asked Questions — UPSC Prelims 1998 Q68

What is the official answer for UPSC Prelims 1998 GS Paper I Question 68 (Geography)?

The official UPSC answer key for this 1998 Geography (Human & Political Geography) question is Option (C): "Troposphere, Stratosphere, Mesosphere, Ionosphere". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1998 question belong to?

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

Use the standard mnemonic 'Trust Me In The Exam' or 'TSMI' (Troposphere, Stratosphere, Mesosphere, Ionosphere/Thermosphere).

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