Who discovered that the element Thorium is radioactive, independently of Marie Curie's tracking experiments? MCQ with Answer and Explanation

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Who discovered that the element Thorium is radioactive, independently of Marie Curie's tracking experiments?

A. Gerhard Carl Schmidt

B. Henri Becquerel

C. Ernest Rutherford

D. Otto Hahn

Answer: Option A

Solution (By JKSSB Mock Tests)

Gerhard Carl Schmidt discovered thorium's radioactivity in 1898, publishing his findings just weeks before Marie Curie.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that regular arrays of atoms act as diffraction gratings for X-rays, establishing X-ray crystallography?

A. Rosalind Franklin

B. William Henry Bragg

C. Max von Laue

D. Wilhelm Röntgen

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Correct Answer: Option C

Explanation:
Max von Laue discovered X-ray diffraction by crystals in 1912, proving the wave nature of X-rays and structural lattice layouts.

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Question #2

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Who discovered the citric acid cycle (also known as the Krebs cycle) in cellular respiration?

A. Arthur Kornberg

B. Melvin Calvin

C. Hans Adolf Krebs

D. Louis Pasteur

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Correct Answer: Option C

Explanation:
Hans Adolf Krebs discovered the metabolic pathway of energy conversion in cells in 1937, winning the Nobel Prize in 1953.

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Question #3

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Who invented the global positioning system (GPS) structural architecture alongside Ivan Getting and Bradford Parkinson?

A. Tim Berners-Lee

B. Alan Turing

C. Gladys West

D. Vint Cerf

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Correct Answer: Option C

Explanation:
Gladys West's mathematical modeling of the Earth's geoid shape was critical to developing the calculations behind accurate GPS tracking.

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