Who invented the first practical electronic pocket calculator, introduced commercially in 1970? MCQ with Answer and Explanation

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Who invented the first practical electronic pocket calculator, introduced commercially in 1970?

A. Alan Turing

B. Sanyo and Texas Instruments teams

C. Charles Babbage

D. Douglas Engelbart

Answer: Option B

Solution (By JKSSB Mock Tests)

Sanyo's ICC-0081 and Texas Instruments' 'Cal-Tech' project initiated the mass scaling of hand-held microelectronic computation.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the common kitchen refrigeration insulation system known as the domestic electric refrigerator was scaled by which engineer?

A. James Dewar

B. Thomas Edison

C. Fred W. Wolf and Nathaniel B. Wales

D. Willis Carrier

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Correct Answer: Option C

Explanation:
Wolf invented early air-cooled attachment refrigerator units in 1913, and Wales engineered units that Kelvinator mass-marketed.

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Question #2

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The invention of the carbon filament telephone transmitter (microphone) that improved long-distance audio was done by whom?

A. Thomas Edison

B. David Edward Hughes

C. Alexander Graham Bell

D. Nikola Tesla

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Correct Answer: Option A

Explanation:
Thomas Alva Edison invented the highly efficient carbon microphone, which became standard for telephone transmitters for decades.

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Question #3

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The invention of the common chemical manufacturing system known as the Chamber Process optimized production of what?

A. Nitric Acid

B. Soda Ash

C. Bleaching Powder

D. Sulfuric Acid

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Correct Answer: Option D

Explanation:
John Roebuck patented the lead-chamber method in 1746, enabling the mass production of sulfuric acid, a key chemical of the Industrial Revolution.

This question belongs to: Static General Knowledge Inventions and Discoveries

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