Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance? MCQ with Answer and Explanation

Question

Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance?

A. Robert Hooke

B. Galileo Galilei

C. Isaac Newton

D. Johannes Kepler

Answer: Option C

Solution (By JKSSB Mock Tests)

Sir Isaac Newton published the Universal Law of Gravitation in his monumental work 'Principia Mathematica' in 1687.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered the law of thermal radiation stating that emissivity equals absorptivity at thermal equilibrium?

A. Josef Stefan

B. Max Planck

C. Wilhelm Wien

D. Gustav Kirchhoff

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Correct Answer: Option D

Explanation:
Gustav Kirchhoff formulated Kirchhoff's Law of Thermal Radiation in 1859, standardizing spectroscopy and thermodynamic modeling.

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Question #2

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The electron was discovered in 1897 by which of the following physicists?

A. Ernest Rutherford

B. J.J. Thomson

C. James Chadwick

D. John Dalton

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Correct Answer: Option B

Explanation:
J.J. Thomson discovered the electron through his experiments with cathode ray tubes in 1897.

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Question #3

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The discovery of heavy water (deuterium oxide) was achieved by which physical chemist?

A. Harold Urey

B. Enrico Fermi

C. Otto Hahn

D. Gilbert N. Lewis

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Correct Answer: Option A

Explanation:
Harold Urey isolated deuterium in 1931 by fractionally distilling liquid hydrogen, winning the 1934 Nobel Prize in Chemistry.

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