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UPSC 2005: Assertion (A): The same face of the Moon is always presented to the Earth. Reason (R): The Moon rotates about its own axis in 23½ days which is about the same time that it takes to orbit the Earth.
(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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Not attemptedCorrect Answer: (c) A is true but R is false
The Moon shows the same face to Earth because it is tidally locked—its rotation period (about 27.3 days) equals its orbital period around Earth. The Reason cites 23½ days, which is incorrect; therefore Assertion is true but Reason is false. ([science.nasa.gov](https://science.nasa.gov/moon/moon-phases/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2005 Geography question?▼
The correct answer is option (c): A is true but R is false. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Astronomy & Earth–Sun System question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2005, GS Paper 1, as Question 83. It falls under Geography > Astronomy & Earth–Sun System.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Astronomy & Earth–Sun System?▼
UPSC has asked 27 questions from Astronomy & Earth–Sun System (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.