Space and Space Technology: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question 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.
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UPSC 2021Science and Technology · Space and Space Technology
Q1. Which one of the following is a reason why astronomical distances are measured in light-years?
Explanation
Astronomical distances are measured in light-years to effectively express the vast distances in space using a consistent and universal unit. A light-year represents the distance light travels in one year in a vacuum, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Astronomers calculate the distances of stars and other celestial objects in the time it takes for light to reach us since estimating distances in miles or kilometres is inadequate on the cosmological scale. Since the speed of light is known to be constant throughout the universe and for high precision, astronomical distances are expressed in terms of light-years. The fastest light can move is in vacuum.
Answer key for these questions
Q
UPSC year
Correct answer
1
2021
(d) The speed of light is always the same.
Frequently asked questions
How many previous year UPSC questions are there on Space and Space Technology?
This page covers 1 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.
