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GS Paper IUPSC Prelims 2024
Space & ISRO
Question No. 99Interactive Test Mode
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Q99. Consider the following statements: Statement-I: Giant stars live much longer than dwarf stars. Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements?

Consider the following statements: Statement-I: Giant stars live much longer than dwarf stars. Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements?

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 2024 • Science and Technology

Correct Answer: Option (D) — Statement-I is incorrect, but Statement-II is correct

Concept & Option Breakdown

Standard Reference Verified

Statement-I is incorrect: Massive giant stars have shorter lifespans (typically millions of years) than dwarf stars (such as red dwarfs, which can live for billions to trillions of years) because they exhaust their nuclear fuel at a tremendously faster rate.

Statement-II is correct: The higher mass of giant stars creates immense core temperature and pressure, drastically accelerating the rate of nuclear fusion compared to low-mass dwarf stars.

Elimination Heuristic & Exam Approach

A higher rate of nuclear reaction (Statement-II) means fuel is consumed faster, which directly contradicts a longer lifespan (Statement-I). Therefore, both cannot be simultaneously true as cause and effect.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2024 (Q99)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Space & ISRO
Official Answer KeyOption (D) — Statement-I is incorrect, but Statement-II is correct

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Frequently Asked Questions — UPSC Prelims 2024 Q99

What is the official answer for UPSC Prelims 2024 GS Paper I Question 99 (Science and Technology)?

The official UPSC answer key for this 2024 Science and Technology (Space & ISRO) question is Option (D): "Statement-I is incorrect, but Statement-II is correct". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2024 question belong to?

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

A higher rate of nuclear reaction (StatementII) means fuel is consumed faster, which directly contradicts a longer lifespan (StatementI). Therefore, both cannot be simultaneously true as cause and effect.

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