The invention of the common mechanical office device known as the copy mimeograph machine was patented by whom? MCQ with Answer and Explanation

Question
The invention of the common mechanical office device known as the copy mimeograph machine was patented by whom?
A. Christopher Sholes
B. John Loud
C. Thomas Edison
D. Chester Carlson
Answer: Option C
Solution (By JKSSB Mock Tests)
Edison patented the stencil duplicating device in 1876, which Albert Dick later refined into the widespread commercial mimeograph.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of the barcode system for scanning retail merchandise was patented by whom?
A. Douglas Engelbart
B. Norman Joseph Woodland and Bernard Silver
C. Alan Turing
D. Masahiro Hara
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Correct Answer: Option B

Explanation:
Woodland and Silver patented the bullseye and linear barcode design in 1952, inspired by Morse code tracking patterns.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered that the chemical element Lithium is isolated from petalite mineral matrices?
A. Humphry Davy
B. Johan August Arfwedson
C. Jöns Jacob Berzelius
D. Antoine Lavoisier
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Correct Answer: Option B

Explanation:
Arfwedson discovered lithium in 1817 while analyzing mineral crystals under Berzelius's laboratory direction.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who invented the first operational safety air-brake system for high-speed railway trains?
A. James Watt
B. Elisha Otis
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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