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UPSC Prelims 2023 Paper-1 📅 28 May, 2023

Consider the following pairs:
Objects in spaceDescription
1. CepheidsGiant clouds of dust and gas in space
2. NebulaeStars which brighten and dim periodically
3. PulsarsNeutron 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
Result Summary
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UPSC Prelims
2023 • 28 May, 2023 • Paper-1
Consider the following pairs:
Objects in spaceDescription
1. CepheidsGiant clouds of dust and gas in space
2. NebulaeStars which brighten and dim periodically
3. PulsarsNeutron stars that are formed when massive stars run out of fuel and collapse

How many of the above pairs are correctly matched?
Correct Answer
Only one
Subject: Science & Tech.Context: Astronomy and Astrophysics.Details: Pair 1 is incorrect; Cepheids are variable stars that pulsate radially, varying in both dia......
Ref/Book : UPSC Prelims 2023
Ref. Subject Science & Tech
Chapter -
Ref. Topic Space Technology
Pg. No -
💡 Analysis & Explanation
Subject ▼
Science & Tech.
Context ▼
Astronomy and Astrophysics.
Details ▼
Pair 1 is incorrect; Cepheids are variable stars that pulsate radially, varying in both diameter and temperature (they brighten and dim). Pair 2 is incorrect; Nebulae are giant interstellar clouds of dust and gas. Pair 3 is correct; Pulsars are highly magnetized, rotating neutron stars formed after the supernova collapse of massive stars. Only one pair is matched correctly.
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