Who discovered that the velocity of falling objects is completely independent of their weight in a vacuum? MCQ with Answer and Explanation

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Who discovered that the velocity of falling objects is completely independent of their weight in a vacuum?

A. Isaac Newton

B. Aristotle

C. Johannes Kepler

D. Galileo Galilei

Answer: Option D

Solution (By JKSSB Mock Tests)

Galileo mathematically disproved Aristotle's weight-proportional velocity model via rigorous acceleration measurements down inclined tracks.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common mechanical office typewriter correction fluid ('Liquid Paper') was developed by which female innovator?

A. Bette Nesmith Graham

B. Mary Anderson

C. Josephine Cochrane

D. Grace Hopper

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Correct Answer: Option A

Explanation:
Graham mixed white tempera paint in a blender in the 1950s to fix her typing errors, later scaling the multi-million-dollar Liquid Paper company.

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Question #2

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Who discovered that the chemical element Chromium is isolated from Siberian red lead ore matrices?

A. Martin Heinrich Klaproth

B. Carl Wilhelm Scheele

C. Louis-Nicolas Vauquelin

D. Antoine Lavoisier

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Correct Answer: Option C

Explanation:
Vauquelin isolated chromium in 1797 by treating crocoite mineral crystals with hydrochloric acid compounds.

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Question #3

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Who discovered the phenomenon of nuclear magnetic resonance (NMR), which forms the basis of modern MRI scanners?

A. Peter Mansfield

B. Felix Bloch

C. Paul Lauterbur

D. Isidor Isaac Rabi

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Correct Answer: Option D

Explanation:
Isidor Isaac Rabi discovered nuclear magnetic resonance in 1938, for which he was awarded the Nobel Prize in Physics in 1944.

This question belongs to: Static General Knowledge Inventions and Discoveries

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