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UPSC 2023: Consider the following pairs: Objects in space — Description 1. Cepheids : Giant clouds of dust and gas in space 2. Nebulae : Stars which brighten and dim periodically 3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse How many of the above pairs are correctly matched?
(a)Only one
(b)Only two
(c)All three
(d)None
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Not attemptedCorrect Answer: (a) Only one
Cepheids are variable stars that brighten and dim periodically, not clouds of gas; nebulae are giant clouds of dust and gas, not variable stars; pulsars are rotating neutron stars formed after the collapse of massive stars. Thus, only the third pair is correctly matched (1 correct pair). ([iasexpress.net](https://www.iasexpress.net/upsc-prelims-2023-general-studies-gs-paper-1-answer-key-detailed-solutions/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2023 Science & Technology question?▼
The correct answer is option (a): Only one. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Space Technology & Astronomy question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2023, GS Paper 1, as Question 56. It falls under Science & Technology > Space Technology & Astronomy.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Space Technology & Astronomy?▼
UPSC has asked 69 questions from Space Technology & Astronomy (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.