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

Question

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

A. David Edward Hughes

B. Thomas Edison

C. Alexander Graham Bell

D. Nikola Tesla

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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The invention of the common household device known as the electric food blender was developed by whom?

A. Thomas Edison

B. Stephen Poplawski

C. Alva Fisher

D. George Schneider

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Correct Answer: Option B

Explanation:
Poplawski patented the bottom-motor container cutting blender mechanism in 1922 to prepare fountain soda drinks.

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Question #2

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The discovery of the electrical conductivity properties of semi-conductive materials under specific doping was pioneered by whom?

A. Nikola Tesla

B. John Bardeen, Walter Brattain, and William Shockley

C. Michael Faraday

D. Thomas Edison

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Correct Answer: Option B

Explanation:
These three physicists invented the point-contact solid-state transistor at Bell Labs in 1947, replacing vacuum tubes.

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Question #3

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Who discovered the law of thermal radiation stating that emissivity equals absorptivity at thermal equilibrium?

A. Josef Stefan

B. Wilhelm Wien

C. Max Planck

D. Gustav Kirchhoff

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Correct Answer: Option D

Explanation:
Gustav Kirchhoff formulated Kirchhoff's Law of Thermal Radiation in 1859, standardizing spectroscopy and thermodynamic modeling.

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