Who discovered the exact relationship between mechanical work done and heat generated, leading to the SI unit of energy? MCQ with Answer and Explanation

Question
Who discovered the exact relationship between mechanical work done and heat generated, leading to the SI unit of energy?
A. Lord Kelvin
B. James Watt
C. James Prescott Joule
D. Rudolf Clausius
Answer: Option C
Solution (By JKSSB Mock Tests)
James Prescott Joule established the mechanical equivalent of heat through rigorous thermodynamic experiments.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of the jet engine is attributed to which British engineer?
A. Hans von Ohain
B. James Dyson
C. Frank Whittle
D. Christopher Cockerell
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Correct Answer: Option C

Explanation:
Sir Frank Whittle submitted the first patent for a turbojet engine in 1930, though Germany's Hans von Ohain built the first operational jet plane independently later.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The invention of high-strength Kevlar fiber, used in body armor, is credited to which female chemist?
A. Rosalind Franklin
B. Marie Curie
C. Stephanie Kwolek
D. Dorothy Hodgkin
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Correct Answer: Option C

Explanation:
Stephanie Kwolek invented the exceptionally strong synthetic fiber Kevlar at DuPont in 1965.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the common mechanical device known as the modern coin-operated parking meter was patented by whom?
A. Carl Magee
B. Garrett Morgan
C. Walter Hunt
D. James Ritty
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Correct Answer: Option A

Explanation:
Carl Magee patented the 'Park-O-Meter' in Oklahoma City in 1935 to regulate downtown vehicle traffic turnover.
This question belongs to: Static General Knowledge Inventions and Discoveries
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