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?
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A hard Science & Technology multiple-choice question from UPSC Prelims 2023. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: A. Only one
Only pair 3 is correct — pulsars are rapidly rotating neutron stars formed when massive stars collapse. Pairs 1 and 2 are swapped: Cepheids are pulsating variable stars (that brighten and dim), and nebulae are clouds of dust and gas.
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