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. Isaac Newton

B. Johannes Kepler

C. Robert Hooke

D. Galileo Galilei

Answer: Option A

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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Question #1

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The discovery of the Raman Effect, which won the Nobel Prize in Physics in 1930, was made by whom?

A. Homi J. Bhabha

B. C.V. Raman

C. Jagadish Chandra Bose

D. Satyendra Nath Bose

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Correct Answer: Option B

Explanation:
Sir Chandrasekhara Venkata Raman discovered the inelastic scattering of light, known as the Raman Effect, on February 28, 1928.

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Question #2

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The invention of the high-power chemical explosive TNT (Trinitrotoluene) was originally intended for use as what?

A. Yellow dye

B. Mining agent

C. Disinfectant

D. Rocket fuel

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Correct Answer: Option A

Explanation:
German chemist Julius Wilbrand discovered TNT in 1863 as a textile dye; its explosive potential was not recognized until decades later.

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Question #3

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The chemical element Oxygen was independently discovered by Carl Wilhelm Scheele and which other English scientist?

A. Henry Cavendish

B. Joseph Priestley

C. John Dalton

D. Humphry Davy

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Correct Answer: Option B

Explanation:
Joseph Priestley discovered oxygen in 1774 and published his findings first, though Scheele had isolated it earlier.

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