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 2024Science and Technology · Space and Space Technology
Q1. Consider the following statements: Statement-I: Giant stars live much longer than dwarf stars. Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements?
Explanation
Stars are classified based on their size, mass, and brightness into categories such as giant stars and dwarf stars. Giant stars are massive, highly luminous stars that burn They are often in the later stages of stellar evolution. Dwarf stars, on the other hand, are smaller, less luminous, Red dwarfs, the most common type, can burn for trillions of years, while white dwarfs are the remnants of low to medium-mass stars after they exhaust their nuclear fuel.
Statement I is incorrect: Giant stars have much shorter lifespans than dwarf stars. Giant stars burn fuel quickly because of their high mass and energy, while red dwarf stars use fuel slowly, allowing them to last billions or even trillions of years.
Statement II is correct: Giant stars have much higher core temperatures and pressures, leading to faster nuclear fusion rates compared to dwarf stars. This high rate of fusion results in a shorter lifespan.
Exam tip:
S2 mentions greater rate of nuclear reaction in giant star hence logically it must last less due to early fuel finish, this contradicts with S1. Hence correct answer is either
option C or D. Bigger star=more fuel=more rate of reaction=hence S2 aligns more and S1 likely false.
Answer key for these questions
Q
UPSC year
Correct answer
1
2024
(d) Statement-I is incorrect, but Statement-II is correct
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.
