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

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

A. Thomas Edison

B. Alexander Graham Bell

C. David Edward Hughes

D. Nikola Tesla

Answer: Option A

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

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1 Report Error

Who discovered the true nature of combustion as an oxidation process, disproving the phlogiston theory?

A. Joseph Priestley

B. John Dalton

C. Antoine Lavoisier

D. Robert Boyle

Correct Answer: Option C

Explanation:
Antoine Lavoisier demonstrated that combustion involves elements chemically combining with oxygen.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2 Report Error

The invention of the common industrial building material known as Portland Cement was patented by whom?

A. Joseph Aspdin

B. Henry Bessemer

C. Thomas Telford

D. James Watt

Correct Answer: Option A

Explanation:
Aspdin patented the chemical calcination formulation of limestone and clay mixtures in England in 1824.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3 Report Error

The vaccine for smallpox was developed by whom in 1796?

A. Louis Pasteur

B. Alexander Fleming

C. Robert Koch

D. Edward Jenner

Correct Answer: Option D

Explanation:
Edward Jenner introduced the smallpox vaccine using cowpox material, pioneering the field of vaccinology.

This question belongs to: Static General Knowledge Inventions and Discoveries