Who invented the acoustic phonograph, capturing audio playback on tin foil cylinders? MCQ with Answer and Explanation

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Who invented the acoustic phonograph, capturing audio playback on tin foil cylinders?

A. Nikola Tesla

B. Thomas Edison

C. Alexander Graham Bell

D. Emile Berliner

Answer: Option B

Solution (By JKSSB Mock Tests)

Thomas Alva Edison invented the phonograph in 1877, capturing acoustic sound waves mechanically via steel needles onto soft foils.

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

A. Theodore Maiman

B. Shuji Nakamura

C. Nick Holonyak

D. Thomas Edison

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Correct Answer: Option C

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

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Question #2

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Who discovered that the Earth's core is divided into solid inner and liquid outer layers?

A. Inge Lehmann

B. Beno Gutenberg

C. Andrija Mohorovičić

D. Charles Richter

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Correct Answer: Option A

Explanation:
Danish seismologist Inge Lehmann discovered the Earth's solid inner core in 1936 by studying seismic wave travel paths.

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Question #3

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Who discovered Vitamin C (ascorbic acid) and its role in preventing scurvy, winning a Nobel Prize in 1937?

A. Albert Szent-Györgyi

B. Frederick Hopkins

C. Casimir Funk

D. Linus Pauling

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Correct Answer: Option A

Explanation:
Albert Szent-Györgyi isolated Vitamin C and discovered its metabolic components, receiving the Nobel Prize in Physiology or Medicine.

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