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. Theodore Maiman

B. Shuji Nakamura

C. Nick Holonyak

D. Thomas Edison

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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The term 'vitamin' was coined by which biochemist in 1912?

A. Louis Pasteur

B. Robert Koch

C. Casimir Funk

D. Frederick Hopkins

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Correct Answer: Option C

Explanation:
Polish biochemist Casimir Funk coined the term 'vitamine' (later shortened to vitamin) to describe vital amine nutrients.

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Question #2

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Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin?

A. Louis Pasteur

B. Alexander Fleming

C. Selman Waksman

D. Robert Koch

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Correct Answer: Option C

Explanation:
Selman Waksman and his student H. Boyd Woodruff isolated actinomycin in 1940, sparking targeted soil microbe screening programs.

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Question #3

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The first practical automatic dishwasher was invented and patented by which female innovator in 1886?

A. Josephine Cochrane

B. Stephanie Kwolek

C. Mary Anderson

D. Grace Hopper

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Correct Answer: Option A

Explanation:
Josephine Cochrane designed the first successful hand-powered mechanical dishwasher because she wanted to protect her fine china from chipping.

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