Who discovered that the chemical element Cadmium is isolated as an impurity inside zinc carbonate mineral ores? MCQ with Answer and Explanation

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Who discovered that the chemical element Cadmium is isolated as an impurity inside zinc carbonate mineral ores?

A. Jöns Jacob Berzelius

B. Friedrich Stromeyer

C. Martin Heinrich Klaproth

D. Carl Wilhelm Scheele

Answer: Option B

Solution (By JKSSB Mock Tests)

Stromeyer discovered cadmium in 1817 while inspecting pharmaceutical zinc oxide samples in Germany.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that the planet Saturn possesses a second massive satellite moon named Rhea?

A. Giovanni Domenico Cassini

B. Christiaan Huygens

C. William Herschel

D. Galileo Galilei

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Correct Answer: Option A

Explanation:
Cassini discovered Rhea in 1672, alongside Tethys, Dione, and Iapetus, using long focal length aerial telescopes.

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Question #2

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The creation of the first highly precise marine chronometer ($H4$) that solved the global longitude tracking problem was done by whom?

A. John Harrison

B. Isaac Newton

C. Christiaan Huygens

D. James Cook

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Correct Answer: Option A

Explanation:
Carpenter turned clockmaker John Harrison built specialized friction-free marine timekeepers that operated accurately on moving ships.

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Question #3

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

A. Galileo Galilei

B. Aristotle

C. Isaac Newton

D. Johannes Kepler

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Correct Answer: Option A

Explanation:
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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