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. Ernest Rutherford

C. Henri Becquerel

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 the biological presence of blood platelets and their exact role in physical blood coagulation?

A. Karl Landsteiner

B. Giulio Bizzozero

C. William Harvey

D. Marcello Malpighi

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Correct Answer: Option B

Explanation:
Italian pathologist Bizzozero identified blood platelets ('piastrine') in 1882, describing how they aggregate to plug damaged blood vessels.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that light velocity shifts slightly depending on whether it moves parallel or perpendicular to the Earth's orbit, leading to the famous null result?

A. James Clerk Maxwell

B. Albert Einstein

C. Hendrik Lorentz

D. Albert Michelson and Edward Morley

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Correct Answer: Option D

Explanation:
The Michelson-Morley experiment in 1887 found no evidence of the hypothetical luminiferous aether, laying the ground for relativity.

This question belongs to: Static General Knowledge Inventions and Discoveries