The invention of the first functional high-vacuum electron tube amplifier, the Audion triode, was made by whom? MCQ with Answer and Explanation

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The invention of the first functional high-vacuum electron tube amplifier, the Audion triode, was made by whom?

A. Lee de Forest

B. Thomas Edison

C. Nikola Tesla

D. John Ambrose Fleming

Answer: Option A

Solution (By JKSSB Mock Tests)

Lee de Forest added a grid control wire element to Fleming's diode in 1906, creating the first signal amplification tube.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common mechanical lock system known as the pin-tumbler cylinder configuration was patented by whom?

A. Walter Hunt

B. Robert Blake

C. Linus Yale Sr. and Linus Yale Jr.

D. Elisha Otis

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Correct Answer: Option C

Explanation:
The Yales developed the cylinder design based on ancient Egyptian wooden locks, which remains common globally.

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Question #2

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Who discovered that light waves travel as transverse vibrations, contradicting the longitudinal wave model?

A. Isaac Newton

B. Christiaan Huygens

C. James Clerk Maxwell

D. Augustin-Jean Fresnel and Thomas Young

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Correct Answer: Option D

Explanation:
Fresnel and Young demonstrated through polarization experiments that light waves propagate perpendicular to the direction of travel.

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Question #3

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Who discovered that biological enzymes can perform structural transformations outside of living cell containers, establishing cell-free fermentation?

A. Robert Koch

B. Hans Krebs

C. Eduard Buchner

D. Louis Pasteur

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Correct Answer: Option C

Explanation:
Buchner proved yeast extracts ferment sugar into ethanol without living cell structural scaffolding, winning the 1907 Nobel Prize in Chemistry.

This question belongs to: Static General Knowledge Inventions and Discoveries

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