Who discovered the presence of the planet Jupiter's four largest satellite moons in 1610? MCQ with Answer and Explanation

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Who discovered the presence of the planet Jupiter's four largest satellite moons in 1610?

A. Galileo Galilei

B. Johannes Kepler

C. Nicolaus Copernicus

D. Tycho Brahe

Answer: Option A

Solution (By JKSSB Mock Tests)

Galileo observed Io, Europa, Ganymede, and Callisto using his primitive refracting glass telescope.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that biological enzymes can perform structural transformations outside of living cell containers, establishing cell-free fermentation?

A. Louis Pasteur

B. Eduard Buchner

C. Robert Koch

D. Hans Krebs

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Correct Answer: Option B

Explanation:
Buchner proved yeast extracts ferment sugar into ethanol without living cell structural scaffolding, winning the 1907 Nobel Prize in Chemistry.

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Question #2

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The invention of the common mechanical device known as the industrial centrifugal cream separator was patented by whom?

A. Gustaf de Laval

B. Eli Whitney

C. James Watt

D. Cyrus McCormick

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Correct Answer: Option A

Explanation:
De Laval patented the high-speed continuous centrifugal cream separator in 1878, streamlining commercial dairy production.

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Question #3

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Who invented the first practical electronic digital computer with binary logic architecture, known as the Z3?

A. John von Neumann

B. Alan Turing

C. Tommy Flowers

D. Konrad Zuse

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Correct Answer: Option D

Explanation:
German engineer Konrad Zuse completed the Z3 in 1941, recognized as the world's first functional program-controlled Turing-complete computer.

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