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. Johannes Kepler

B. Galileo Galilei

C. Tycho Brahe

D. Nicolaus Copernicus

Answer: Option B

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

The invention of the dynamite is credited to which Swedish chemist?

A. Svante Arrhenius

B. Alfred Nobel

C. Jöns Jacob Berzelius

D. Carl Wilhelm Scheele

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Correct Answer: Option B

Explanation:
Alfred Nobel invented dynamite in 1867, and later used his enormous fortune to institute the Nobel Prizes.

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Question #2

The first practical monochrome computer mouse was invented by whom at the Stanford Research Institute?

A. Douglas Engelbart

B. Alan Turing

C. Steve Jobs

D. Bill Gates

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Correct Answer: Option A

Explanation:
Douglas Engelbart invented the computer mouse in 1964, constructed out of a wooden shell with two metallic wheels.

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Question #3

The invention of the common computing peripheral device known as the dot-matrix print layout was introduced by which company?

A. Centronics

B. IBM

C. Apple

D. Canon

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Correct Answer: Option A

Explanation:
Centronics introduced the impact needle dot matrix printer model in 1970, standardizing early computer ribbon output designs.

This question belongs to: Static General Knowledge Inventions and Discoveries

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