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

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

A. Charles Babbage

B. Douglas Engelbart

C. Alan Turing

D. Sanyo and Texas Instruments teams

Answer: Option D

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 Report Error

The invention of the standard mechanical typewriter carbon paper mechanism to replicate text was patented by whom?

A. Walter Hunt

B. John Loud

C. Christopher Sholes

D. Pellegrino Turri

Correct Answer: Option D

Explanation:
Pellegrino Turri developed early carbon pigment transfer papers in 1806 to functionalize his experimental typing machines.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2 Report Error

Who invented the first practical modern revolver firearm in 1836?

A. Richard Gatling

B. Samuel Colt

C. Oliver Winchester

D. John Browning

Correct Answer: Option B

Explanation:
Samuel Colt patented the revolving cylinder pistol mechanism that allowed multiple shots to be fired without manual reloading.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3 Report Error

Who discovered that blood can be categorized into various Rh factors (positive and negative)?

A. William Harvey

B. Karl Landsteiner and Alexander Wiener

C. Edward Jenner

D. Robert Koch

Correct Answer: Option B

Explanation:
Karl Landsteiner and Alexander S. Wiener discovered the Rhesus (Rh) factor in blood in 1937.

This question belongs to: Static General Knowledge Inventions and Discoveries