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. Nikola Tesla

C. John Ambrose Fleming

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 exact value of the Earth's circumference using simple trigonometry and shadow lengths during solar eclipses?

A. Eratosthenes

B. Aristotle

C. Archimedes

D. Ptolemy

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Correct Answer: Option A

Explanation:
Eratosthenes calculated the Earth's physical dimensions in the 3rd century BCE by comparing shadow angles in Alexandria and Syene.

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Question #2

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The laser (Light Amplification by Stimulated Emission of Radiation) was first constructed by whom in 1960?

A. Charles Townes

B. Arthur Schawlow

C. Albert Einstein

D. Theodore Maiman

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Correct Answer: Option D

Explanation:
Theodore Maiman built the first functioning laser in 1960 at Hughes Research Laboratories, using a synthetic ruby crystal.

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Question #3

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Who discovered the presence of the cellular mitochondria organelle, naming them 'bioblasts' before they were renamed?

A. Camillo Golgi

B. Richard Altmann

C. Carl Benda

D. Robert Hooke

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Correct Answer: Option B

Explanation:
Richard Altmann identified the structures in 1890; Carl Benda later coined the exact term 'mitochondria' in 1898.

This question belongs to: Static General Knowledge Inventions and Discoveries

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