The invention of the barcode system for scanning retail merchandise was patented by whom? MCQ with Answer and Explanation

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The invention of the barcode system for scanning retail merchandise was patented by whom?

A. Alan Turing

B. Douglas Engelbart

C. Norman Joseph Woodland and Bernard Silver

D. Masahiro Hara

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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Question #1

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Who discovered the element Potassium via electrolytic extraction shortly after isolating Sodium?

A. Humphry Davy

B. Antoine Lavoisier

C. Michael Faraday

D. Jöns Jacob Berzelius

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Correct Answer: Option A

Explanation:
Sir Humphry Davy isolated potassium in 1807 by running current through molten caustic potash ($KOH$).

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Question #2

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The invention of the first functional synthetic dye, Mauveine, was an accidental discovery by which young chemist?

A. Antoine Lavoisier

B. Fritz Haber

C. August Wilhelm von Hofmann

D. William Henry Perkin

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Correct Answer: Option D

Explanation:
Perkin accidentally synthesized aniline purple dye in 1856 while attempting to manufacture artificial anti-malarial quinine out of coal tar.

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Question #3

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Who invented the first thermionic valve (vacuum tube diode) in 1904?

A. Nikola Tesla

B. Lee de Forest

C. Thomas Edison

D. John Ambrose Fleming

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Correct Answer: Option D

Explanation:
John Ambrose Fleming invented the oscillation valve, the first vacuum tube diode, which transformed radio technology.

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