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. Douglas Engelbart

B. Charles Babbage

C. Sanyo and Texas Instruments teams

D. Alan Turing

Answer: Option C

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 lead-acid rechargeable battery in 1859, still used in automobiles today, was done by whom?

A. John Daniell

B. Gaston Planté

C. Alessandro Volta

D. Thomas Edison

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Correct Answer: Option B

Explanation:
French physicist Gaston Planté invented the lead-acid cell, the first chemical battery that could be recharged by reversing the current.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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The invention of the common mechanical cash layout system tracking mechanism was expanded by which major corporation?

A. Xerox

B. IBM

C. Microsoft

D. NCR (National Cash Register) under John H. Patterson

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Correct Answer: Option D

Explanation:
NCR purchased Ritty's early patents and scaled mechanical register verification across retail networks globally.

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Question #3

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The invention of the common electronic LED (Light Emitting Diode) operating in the visible light spectrum was developed by whom?

A. Shuji Nakamura

B. Thomas Edison

C. Theodore Maiman

D. Nick Holonyak

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Correct Answer: Option D

Explanation:
Nick Holonyak invented the first practical visible-spectrum (red) light-emitting diode in 1962 while working at General Electric.

This question belongs to: Static General Knowledge Inventions and Discoveries

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