Who invented the first thermionic valve (vacuum tube diode) in 1904? MCQ with Answer and Explanation

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Who invented the first thermionic valve (vacuum tube diode) in 1904?

A. Lee de Forest

B. Nikola Tesla

C. John Ambrose Fleming

D. Thomas Edison

Answer: Option C

Solution (By JKSSB Mock Tests)

John Ambrose Fleming invented the oscillation valve, the first vacuum tube diode, which transformed radio technology.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that yellow fever is transmitted by a specific mosquito species rather than direct human contact?

A. Louis Pasteur

B. Ronald Ross

C. Carlos Finlay

D. Walter Reed

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Correct Answer: Option D

Explanation:
Major Walter Reed led the commission that experimentally proved Carlos Finlay's theory that yellow fever is transmitted by the Aedes aegypti mosquito.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who invented the acoustic phonograph, capturing audio playback on tin foil cylinders?

A. Emile Berliner

B. Thomas Edison

C. Nikola Tesla

D. Alexander Graham Bell

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Correct Answer: Option B

Explanation:
Thomas Alva Edison invented the phonograph in 1877, capturing acoustic sound waves mechanically via steel needles onto soft foils.

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Question #3

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Who discovered the exact relationship between mechanical work done and heat generated, leading to the SI unit of energy?

A. James Prescott Joule

B. Rudolf Clausius

C. Lord Kelvin

D. James Watt

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Correct Answer: Option A

Explanation:
James Prescott Joule established the mechanical equivalent of heat through rigorous thermodynamic experiments.

This question belongs to: Static General Knowledge Inventions and Discoveries

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