The electron was discovered in 1897 by which of the following physicists? MCQ with Answer and Explanation

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The electron was discovered in 1897 by which of the following physicists?

A. J.J. Thomson

B. Ernest Rutherford

C. John Dalton

D. James Chadwick

Answer: Option A

Solution (By JKSSB Mock Tests)

J.J. Thomson discovered the electron through his experiments with cathode ray tubes in 1897.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered the fundamental principle of chemical thermodynamics relating free energy, enthalpy, and entropy?

A. Sadi Carnot

B. Lord Kelvin

C. James Joule

D. Josiah Willard Gibbs

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Correct Answer: Option D

Explanation:
Josiah Willard Gibbs formulated Gibbs Free Energy ($G = H - TS$), establishing mathematical precision within physical chemistry.

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Question #2

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The invention of the mechanical printing press was dramatically optimized by Gutenberg using an alloy of which metals?

A. Copper and Zinc

B. Iron and Carbon

C. Lead, Tin, and Antimony

D. Gold and Silver

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Correct Answer: Option C

Explanation:
Gutenberg formulated a specialized type metal alloy that melted at low temperatures but resisted high casting pressures.

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Question #3

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

A. Louis Pasteur

B. Melvin Calvin

C. Hans Adolf Krebs

D. Arthur Kornberg

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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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