Solar System and Evolution of Earth: UPSC Previous Year Questions (Geography)
1 previous year UPSC Prelims question on Solar System and Evolution of Earth (Geography). 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 2006Geography · Solar System and Evolution of Earth
Q1. Assertion (A): To orbit around the Sun the planet Mars takes lesser time than the time taken by the earth. Reason (R): The diameter of the planet Mars is less than that of earth.
Explanation
Assertion (A) is False: Mars takes a longer time than Earth to orbit the Sun. The time taken by a planet to orbit around the Sun is called its orbital period or year. Mars has an orbital period of about 687 Earth days which means it takes 687 days to complete one revolution around the Sun. Earth takes 365.25 days (about 365 days) to complete one revolution around the Sun. Reason (R) is True: Mars does have a smaller diameter than Earth. The diameter of Earth is 12,742 km. The diameter of Mars is 6,779 km (almost half of Earth). The time taken by a planet to orbit the Sun depends on its distance from the Sun, not its diameter. Since Mars is farther from the Sun than Earth thus it has a longer orbital period.
Answer key for these questions
Q
UPSC year
Correct answer
1
2006
(d) A is false, but R is true.
Frequently asked questions
How many previous year UPSC questions are there on Solar System and Evolution of Earth?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Solar System and Evolution of Earth (Geography), asked from 1996 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 Solar System and Evolution of Earth?
Questions on Solar System and Evolution of Earth (Geography) are available for 12 years, from 1996 to 2025. Use the Year filter to practise a single paper.
