The invention of the common mechanical combination lock system used in bank vaults was patented by whom? MCQ with Answer and Explanation

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The invention of the common mechanical combination lock system used in bank vaults was patented by whom?

A. Walter Hunt

B. Linus Yale Jr.

C. Alexander Mitchell

D. Elisha Otis

Answer: Option B

Solution (By JKSSB Mock Tests)

Linus Yale Jr. patented the secure pin-tumbler lock and combination wheel locks in the 1860s.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Alexander Fleming discovered penicillin, the world's first effective antibiotic, in which year?

A. 1918

B. 1935

C. 1942

D. 1928

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Correct Answer: Option D

Explanation:
Sir Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital, London, after noticing a mold contaminating a petridish of staphylococci.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who is credited with the invention of the submarine 'Turtle', used in military action?

A. Robert Fulton

B. Cornelis Drebbel

C. David Bushnell

D. John Philip Holland

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Correct Answer: Option C

Explanation:
David Bushnell invented the Turtle in 1775, the first submarine ever used in combat.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who discovered artificial radioactivity and shared a Nobel Prize with her husband in 1935?

A. Lise Meitner

B. Irène Joliot-Curie

C. Marie Curie

D. Maria Goeppert Mayer

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Correct Answer: Option B

Explanation:
Irène Joliot-Curie (daughter of Marie Curie) and her husband Frédéric Joliot-Curie discovered artificial radioactivity.

This question belongs to: Static General Knowledge Inventions and Discoveries

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