The invention of the common electronic LED (Light Emitting Diode) operating in the visible light spectrum was developed by whom? MCQ with Answer and Explanation

Question

The invention of the common electronic LED (Light Emitting Diode) operating in the visible light spectrum was developed by whom?

A. Thomas Edison

B. Shuji Nakamura

C. Nick Holonyak

D. Theodore Maiman

Answer: Option C

Solution (By JKSSB Mock Tests)

Nick Holonyak invented the first practical visible-spectrum (red) light-emitting diode in 1962 while working at General Electric.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the common mechanical marine escape capsule configuration was engineered by whom?

A. Alexander Mitchell

B. John Ericsson

C. Robert Fulton

D. Cornelis Drebbel

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Correct Answer: Option C

Explanation:
Fulton optimized underlying physical buoyancy balances, generating early blueprints for underwater tracking and marine transport apparatus.

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Question #2

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Who formulated the quantum theory, establishing that energy is emitted in discrete packets called quanta?

A. Albert Einstein

B. Max Planck

C. Louis de Broglie

D. Werner Heisenberg

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Correct Answer: Option B

Explanation:
Max Planck introduced quantum theory in 1900, originating Planck's constant ($h$), and won the 1918 Nobel Prize.

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Question #3

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Who discovered the mathematical value and formula for the Universal Gravitational Constant ($G$) using a torsion balance?

A. Isaac Newton

B. Robert Hooke

C. Henry Cavendish

D. Albert Einstein

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Correct Answer: Option C

Explanation:
Henry Cavendish measured the density of the Earth and effectively calculated the value of the gravitational constant $G$ in 1798.

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