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

Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance?
A. Johannes Kepler
B. Isaac Newton
C. Robert Hooke
D. Galileo Galilei
Answer: Option B
Solution (By JKSSB Mock Tests)
Sir Isaac Newton published the Universal Law of Gravitation in his monumental work 'Principia Mathematica' in 1687.

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Practice More Inventions and Discoveries Questions

Question #1
The invention of the diesel engine is named after which German mechanical engineer?
A. Nikolaus Otto
B. Rudolf Diesel
C. Karl Benz
D. Gottlieb Daimler

Correct Answer: Option B


Explanation:
Rudolf Diesel designed a high-efficiency compression-ignition internal combustion engine, patented in 1893.

Question #2
The invention of the common military defensive structure known as Barbed Wire was patented in its definitive commercial form by whom?
A. Joseph Glidden
B. Eli Whitney
C. Cyrus McCormick
D. John Deere

Correct Answer: Option A


Explanation:
Joseph Glidden patented the two-wire twisted barb lock mechanism in 1874, changing open-range farming and livestock control.

Question #3
The invention of the common chemical process for mass-producing high-grade steel from molten pig iron is named after whom?
A. Carl Wilhelm Siemens
B. Henry Bessemer
C. James Watt
D. Andrew Carnegie

Correct Answer: Option B


Explanation:
The Bessemer Process removes structural impurities via air blasting through molten iron matrices, decreasing production costs.