UPSC Prelims 2023 – Question 56

Q56. Consider the following pairs : 

Objects in space: Description 

1. Cepheids: Giant clouds of dust and gas in space 

2. Nebulae: Stars that 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? 

1. Only one 

2. Only two 

3. All three 

4. None  

Correct Answer: Option (d) 

• Cepheids, also called Cepheid Variables, are stars that brighten and dim periodically. Hence, pair 1 is not correctly matched. 
• A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. Hence, pair 2 is not correctly matched. 
• Pulsars are rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to seconds. Hence, pair 3 is not correctly matched. 

For UPSC Prelims Resources, Click here

For Daily Updates and Study Material:

Join our Telegram Channel – Edukemy for IAS

• 1. Learn through Videos – here
• 2. Be Exam Ready by Practicing Daily MCQs – here
• 3. Daily Newsletter – Get all your Current Affairs Covered – here
• 4. Mains Answer Writing Practice – here

Visit our YouTube Channel – here