The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom? MCQ with Answer and Explanation

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The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom?

A. Christopher Sholes

B. Walter Hunt

C. John Lee Love

D. Nicolas Conté

Answer: Option C

Solution (By JKSSB Mock Tests)

African-American inventor John Lee Love patented the simple, functional portable mechanical sharpener layout ('Love Sharpener') in 1897.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common domestic non-stick cookware surface pan coating was developed using which material?

A. PTFE (Teflon) by Marc Grégoire

B. Kevlar

C. Nylon

D. Bakelite

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Correct Answer: Option A

Explanation:
French engineer Marc Grégoire developed the process to bond Teflon to aluminum pan matrices, founding the Tefal brand.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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

A. Werner Heisenberg

B. Louis de Broglie

C. Albert Einstein

D. Max Planck

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Correct Answer: Option D

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 invented the first operational safety air-brake system for high-speed railway trains?

A. Elisha Otis

B. James Watt

C. George Stephenson

D. George Westinghouse

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Correct Answer: Option D

Explanation:
George Westinghouse patented the compressed-air brake in 1869, automating uniform halting across all train cars simultaneously.

This question belongs to: Static General Knowledge Inventions and Discoveries

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