Who discovered that the chemical element Vanadium exists within iron slag residues, verifying its modern entry? MCQ with Answer and Explanation

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Who discovered that the chemical element Vanadium exists within iron slag residues, verifying its modern entry?

A. Andrés Manuel del Río

B. Martin Klaproth

C. Jöns Jacob Berzelius

D. Nils Gabriel Sefström

Answer: Option D

Solution (By JKSSB Mock Tests)

Del Río noticed it early in Mexico ('erythronium'), but Sefström isolated and confirmed the element in Swedish iron ores in 1830.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the widely used computer programming language C was developed by whom at Bell Labs in 1972?

A. Dennis Ritchie

B. Bjarne Stroustrup

C. Guido van Rossum

D. James Gosling

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Correct Answer: Option A

Explanation:
Dennis Ritchie created the C language to rewrite the Unix operating system, laying foundations for modern system software.

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Question #2

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Who discovered that the planet Saturn possesses a wide gap inside its ring bands, known as the Cassini Division?

A. Giovanni Domenico Cassini

B. Galileo Galilei

C. Christiaan Huygens

D. William Herschel

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Correct Answer: Option A

Explanation:
Cassini discovered the distinct gap separating Saturn's A and B rings in 1675 from the Paris Observatory.

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Question #3

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The invention of the jet engine is attributed to which British engineer?

A. Hans von Ohain

B. Christopher Cockerell

C. Frank Whittle

D. James Dyson

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Correct Answer: Option C

Explanation:
Sir Frank Whittle submitted the first patent for a turbojet engine in 1930, though Germany's Hans von Ohain built the first operational jet plane independently later.

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