Who discovered that light travels in packets of discrete energy called photons, explaining the Photoelectric Effect? MCQ with Answer and Explanation

Question
Who discovered that light travels in packets of discrete energy called photons, explaining the Photoelectric Effect?
A. Max Planck
B. Louis de Broglie
C. Niels Bohr
D. Albert Einstein
Answer: Option D
Solution (By JKSSB Mock Tests)
Albert Einstein won the 1921 Nobel Prize in Physics for his 1905 paper applying quantum concepts to the photoelectric effect.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered that cosmic celestial entities emit radio signals, establishing the branch of Radio Astronomy?
A. Karl Jansky
B. Edwin Hubble
C. Grote Reber
D. Guglielmo Marconi
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Correct Answer: Option A

Explanation:
Jansky discovered radio emission noise origins from the galactic center in 1931 using directional rotating antenna arrays at Bell Labs.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The invention of the common mechanical elevator safety brake system was publicly demonstrated at the World's Fair by whom?
A. Henry Bessemer
B. James Watt
C. Thomas Edison
D. Elisha Otis
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Correct Answer: Option D

Explanation:
Otis dramatic demonstration in 1854 involved cutting the platform support rope while standing on it, proving the safety gear worked.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the modern mechanical cotton picking machine was developed by which brother team?
A. John and Mack Rust
B. Siemens Brothers
C. Montgolfier Brothers
D. Wright Brothers
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Correct Answer: Option A

Explanation:
The Rust brothers patented the automated spindle mechanical cotton harvester in the 1930s, mechanizing Southern agriculture.
This question belongs to: Static General Knowledge Inventions and Discoveries
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