2026 Current Affairs practice question for Railways, SSC, UPSC. Select an option to check your answer, read the explanation and continue practicing.
Earth's Rotation Day, observed annually on 8 January, commemorates the famous 1851 experiment of which physicist?
Correct Answerसही उत्तर
A. Léon FoucaultA. Léon Foucault
Explanationव्याख्या
The correct answer is Léon Foucault.
According to the source, Earth's Rotation Day is observed annually on 8 January and honours the 1851 experiment of French physicist Léon Foucault.
His famous pendulum experiment provided definitive empirical evidence of the Earth's rotation.
The observance aims to increase public understanding of Earth's continual spinning on its axis and the effects of that rotation on everyday life, climate and natural phenomena.
The source explains that Earth's rotation is essential for the day-night cycle and also influences climate and wind patterns.
The historical significance of Foucault's Pendulum lies in the fact that it visually demonstrated the rotation of Earth rather than merely presenting the idea as a theoretical proposition.
The source also notes that concepts of Earth rotating can be traced back to Greek philosophers around 470 BC, but empirical support remained inadequate until the nineteenth century.
This distinction between an ancient idea and later experimental proof can be useful in statement-based questions.
For examination revision, remember the sequence: Earth's Rotation Day → 8 January → Léon Foucault → French physicist → 1851 experiment → Foucault Pendulum → empirical evidence of Earth's rotation → rotation causes day-night cycle and affects wind
climate → conceptual origins around 470 BC.
Students should not confuse Earth's Rotation Day with Earth Day or other environmental observances.
Since the question asks the physicist whose 1851 experiment is commemorated, option A, Léon Foucault, is correct.
सही उत्तर Léon Foucault है। Source के अनुसार Earth's Rotation Day annually 8 January को observed किया जाता है और यह French physicist Léon Foucault के 1851 experiment को honour करता है। उनके famous Foucault Pendulum experiment ने Earth's rotation का definitive empirical evidence provide किया। Day का objective public understanding बढ़ाना है कि Earth अपने axis पर continually rotate करती है और यह rotation daily life, climate तथा natural phenomena को कैसे affect करती है। Source बताता है कि Earth's rotation day-night cycle के लिए essential है और wind patterns तथा climate को भी influence करती है। Foucault Pendulum की historical importance इस बात में है कि इसने Earth's rotation को experimentally illustrate किया, न कि केवल theoretical idea के रूप में present किया। Source यह भी बताता है कि Earth rotation का concept Greek philosophers के समय around 470 BC तक trace किया जा सकता है, लेकिन nineteenth century से पहले पर्याप्त empirical proof उपलब्ध नहीं था। Exam में ancient idea और experimental proof को mix करके statements बनाए जा सकते हैं। Revision chain: Earth's Rotation Day → 8 Jan → Léon Foucault → French physicist → 1851 → Foucault Pendulum → evidence of Earth's rotation → day-night cycle → wind + climate → early concept around 470 BC। इसलिए option A सही answer है।
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