Who discovered the precise value of the physical constant detailing the number of structural units in one mole of material? MCQ with Answer and Explanation

Question
Who discovered the precise value of the physical constant detailing the number of structural units in one mole of material?
A. John Dalton
B. Amedeo Avogadro
C. Max Planck
D. Jean Perrin
Answer: Option D
Solution (By JKSSB Mock Tests)
While the constant is named after Avogadro, Jean Perrin calculated its exact value through experimental tracking of Brownian motion, winning a Nobel Prize.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of the modern mechanical reaper, which automated grain harvesting, was patented by whom?
A. Cyrus McCormick
B. John Deere
C. Eli Whitney
D. James Hargreaves
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Correct Answer: Option A

Explanation:
Cyrus McCormick patented the horse-drawn mechanical reaper in 1834, transforming agricultural output.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered that atomic radioactive decay emits discrete high-energy electromagnetic waves named 'Gamma Rays'?
A. Henri Becquerel
B. Marie Curie
C. Ernest Rutherford
D. Paul Villard
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Correct Answer: Option D

Explanation:
French chemist Paul Villard discovered gamma radiation in 1900 while studying uranium emission shielding paths.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who invented the alkaline storage battery and the phonograph?
A. Nikola Tesla
B. Alessandro Volta
C. Thomas Edison
D. Michael Faraday
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Correct Answer: Option C

Explanation:
Thomas Alva Edison developed the phonograph in 1877 and later engineered the commercial alkaline storage battery.
This question belongs to: Static General Knowledge Inventions and Discoveries
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