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. Thomas Edison

B. John Ambrose Fleming

C. Nikola Tesla

D. Lee de Forest

Answer: Option D

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

A. James Joule

B. Sadi Carnot

C. Lord Kelvin

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 common medical diagnostic device known as the blood pressure cuff (Sphygmomanometer) was optimized by whom?

A. René Laennec

B. Joseph Lister

C. Willem Einthoven

D. Scipione Riva-Rocci and Harvey Cushing

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Correct Answer: Option D

Explanation:
Riva-Rocci introduced the mercury arm-cuff design in 1896, and neurosurgeon Harvey Cushing popularized it globally.

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Question #3

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The invention of the common mathematical calculation layout known as the matrix determinants was developed independently by whom?

A. René Descartes

B. Isaac Newton

C. Gottfried Wilhelm Leibniz and Seki Takakazu

D. Blaise Pascal

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Correct Answer: Option C

Explanation:
Leibniz and Japanese mathematician Seki Takakazu independently developed algebraic determinant patterns to resolve linear simultaneous groupings.

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