The invention of the safety razor with disposable stamped steel blades was introduced by whom? MCQ with Answer and Explanation

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The invention of the safety razor with disposable stamped steel blades was introduced by whom?

A. Elisha Otis

B. John Loud

C. King Camp Gillette

D. Walter Hunt

Answer: Option C

Solution (By JKSSB Mock Tests)

King Camp Gillette patented the safety razor system with cheap, replaceable double-edged blades in 1904.

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 kitchen refrigeration insulation system known as the domestic electric refrigerator was scaled by which engineer?

A. James Dewar

B. Fred W. Wolf and Nathaniel B. Wales

C. Thomas Edison

D. Willis Carrier

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Correct Answer: Option B

Explanation:
Wolf invented early air-cooled attachment refrigerator units in 1913, and Wales engineered units that Kelvinator mass-marketed.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered the first recognized hormonal messenger molecule in the human body, Secretin?

A. Charles Best

B. William Bayliss and Ernest Starling

C. Karl Landsteiner

D. Frederick Banting

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Correct Answer: Option B

Explanation:
Bayliss and Starling isolated secretin in 1902, discovering chemical signaling loops that function independently of direct nervous inputs.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who discovered the fundamental genetic mechanism of 'jumping genes' (transposons) in maize?

A. Thomas Hunt Morgan

B. Rosalind Franklin

C. James Watson

D. Barbara McClintock

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Correct Answer: Option D

Explanation:
Barbara McClintock discovered genetic transposition in the 1940s and received an unshared Nobel Prize in 1983.

This question belongs to: Static General Knowledge Inventions and Discoveries

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