The invention of the common mechanical office typewriter spool ribbon reversal mechanism was patented by whom? MCQ with Answer and Explanation

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The invention of the common mechanical office typewriter spool ribbon reversal mechanism was patented by whom?

A. John Pratt and Franz Xaver Wagner

B. Walter Hunt

C. John Loud

D. Christopher Sholes

Answer: Option A

Solution (By JKSSB Mock Tests)

Wagner patented the front-strike visibility layout and automated ribbon reversing wheels, which Underwood manufactured.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who invented the lithium-ion battery architecture, winning the Nobel Prize in Chemistry in 2019?

A. Thomas Edison

B. Gaston Planté

C. Alessandro Volta

D. John B. Goodenough, M. Stanley Whittingham, and Akira Yoshino

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Correct Answer: Option D

Explanation:
These three scientists developed the lightweight, rechargeable, and highly energetic lithium-ion battery technology.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who invented the multi-matrix code known as the QR (Quick Response) Code in 1994?

A. Masahiro Hara

B. Norman Joseph Woodland

C. Tim Berners-Lee

D. Alan Turing

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Correct Answer: Option A

Explanation:
Masahiro Hara from the Japanese company Denso Wave invented the QR code in 1994 to track automobile components during assembly.

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Question #3

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Who discovered that electrical currents pass through vacuum cavities via discrete streams named 'Cathode Rays'?

A. Michael Faraday

B. J.J. Thomson

C. William Crookes and Julius Plücker

D. Wilhelm Röntgen

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Correct Answer: Option C

Explanation:
Plücker observed early glow phenomena, and Crookes engineered highly evacuated discharge tubes to isolate ray behaviors.

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