Who discovered the radioactive elements Radium and Polonium? MCQ with Answer and Explanation

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Who discovered the radioactive elements Radium and Polonium?

A. Marie and Pierre Curie

B. Henri Becquerel

C. Ernest Rutherford

D. Otto Hahn

Answer: Option A

Solution (By JKSSB Mock Tests)

Marie Skłodowska-Curie and her husband Pierre isolated polonium and radium from pitchblende ore in 1898.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that the element Uranium is isolated from pitchblende mineral ores, naming it after a newly found planet?

A. Henri Becquerel

B. Jöns Jacob Berzelius

C. Martin Heinrich Klaproth

D. Carl Wilhelm Scheele

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Correct Answer: Option C

Explanation:
Klaproth isolated a uranium compound oxide in 1789, naming it in honor of Herschel's discovery of the planet Uranus.

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Question #2

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Who discovered that the velocity of sound in a gas depends directly on the ratio of specific heats?

A. Pierre-Simon Laplace

B. Christiaan Huygens

C. Robert Boyle

D. Isaac Newton

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Correct Answer: Option A

Explanation:
Laplace corrected Newton's isothermal calculation of sound speed by incorporating adiabatic heating/cooling factors.

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Question #3

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The invention of the first functional synthetic dye, Mauveine, was an accidental discovery by which young chemist?

A. William Henry Perkin

B. Antoine Lavoisier

C. August Wilhelm von Hofmann

D. Fritz Haber

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Correct Answer: Option A

Explanation:
Perkin accidentally synthesized aniline purple dye in 1856 while attempting to manufacture artificial anti-malarial quinine out of coal tar.

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