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GS Paper IUPSC Prelims 2019
Space & ISRO
Question No. 105Interactive Test Mode
00:00
+2-0.66

Q105. Recently, scientists observed the merger of giant ‘blackholes’ billions of light years away from the Earth. What is the significance of this observation?

Recently, scientists observed the merger of giant ‘blackholes’ billions of light years away from the Earth. What is the significance of this observation?

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 2019 • Science and Technology

Correct Answer: Option (B) — ‘Gravitational waves’ were detected.

Concept & Option Breakdown

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Option B is correct: The merger of binary black holes generated ripple-like disturbances in the fabric of spacetime, known as gravitational waves, which were first directly detected by the LIGO observatories in 2015 and 2016, confirming a key prediction of Einstein's General Theory of Relativity.

Elimination Heuristic & Exam Approach

Directly associate massive accelerating cosmic collisions (binary black holes, neutron stars) with the landmark discovery of gravitational waves.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2019 (Q105)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Space & ISRO
Official Answer KeyOption (B) — ‘Gravitational waves’ were detected.

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Frequently Asked Questions — UPSC Prelims 2019 Q105

What is the official answer for UPSC Prelims 2019 GS Paper I Question 105 (Science and Technology)?

The official UPSC answer key for this 2019 Science and Technology (Space & ISRO) question is Option (B): "‘Gravitational waves’ were detected.". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2019 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?

Directly associate massive accelerating cosmic collisions (binary black holes, neutron stars) with the landmark discovery of gravitational waves.

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