Space and Space Technology: UPSC Previous Year Questions (Science and Technology)
2 previous year UPSC Prelims questions on Space and Space Technology (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–2 of 2 questions
UPSC 2023Science and Technology · Space and Space Technology
Q1. 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?
Explanation
Pair 1 is not correct: Cepheids, also known as Cepheid Variables, are stars that periodically brighten and dim. Due to their behaviour, these objects can function as cosmic indicators, extending their usefulness as yardsticks for distances up to several tens of millions of light-years away, owing to a consistent relationship between their brightness and other factors.
Pair 2 is not correct: A nebula is a very large cloud of gas and dust in outer space. A dead star’s explosion, such as a supernova, releases gas and dust, which in turn forms certain nebulae (more than one nebula). Other nebulae are places where brand-new stars are only starting to develop. It is for this reason that some nebulae are referred to as "star nurseries."
Pair 3 is correct: Pulsars are extremely compact, rapidly km (12 miles). They are virtually entirely made of neutrons that are formed when massive stars run out of fuel and collapse.
UPSC 2023Science and Technology · Space and Space Technology
Q2. Which one of the following countries has its own Satellite Navigation System?
Explanation
The term "Global Navigation Satellite System" (GNSS) encompasses any satellite network offering positioning, navigation, and timing (PNT) services either globally or within specific regions.The Quasi-Zenith Satellite System (QZSS) stands as a regional GNSS owned by the Government of Japan, aiming to bolster coverage in East Asia and Oceania while complementing GPS.
Answer key for these questions
Q
UPSC year
Correct answer
1
2023
(a) Only one
2
2023
(d) Japan
Frequently asked questions
How many previous year UPSC questions are there on Space and Space Technology?
This page covers 2 previous year UPSC Prelims GS Paper-I questions on Space and Space Technology (Science and Technology), asked from 2002 to 2025. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Space and Space Technology?
Questions on Space and Space Technology (Science and Technology) are available for 21 years, from 2002 to 2025. Use the Year filter to practise a single paper.
