Who invented the first operational safety air-brake system for high-speed railway trains? MCQ with Answer and Explanation

Question
Who invented the first operational safety air-brake system for high-speed railway trains?
A. Elisha Otis
B. James Watt
C. George Westinghouse
D. George Stephenson
Answer: Option C
Solution (By JKSSB Mock Tests)
George Westinghouse patented the compressed-air brake in 1869, automating uniform halting across all train cars simultaneously.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered that absolute thermodynamic entropy reaches zero for pure crystalline elements at absolute zero temperature?
A. Max Planck
B. Lord Kelvin
C. James Joule
D. Walther Nernst
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Correct Answer: Option D

Explanation:
Walther Nernst formulated the Third Law of Thermodynamics, which earned him the 1920 Nobel Prize in Chemistry.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The invention of the common electronic operating layout known as the Graphical User Interface (GUI) was pioneered by which lab?
A. Xerox PARC
B. Apple Computers
C. Microsoft
D. IBM Research
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Correct Answer: Option A

Explanation:
Xerox Palo Alto Research Center (PARC) engineered the Alto computer featuring mouse-driven windows, menus, and file icons.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the common mechanical device known as the automobile automatic transmission assembly was engineered by whom?
A. Karl Benz
B. Earl Thompson and the General Motors team
C. Henry Ford
D. Rudolf Diesel
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Correct Answer: Option B

Explanation:
Thompson designed the 'Hydra-Matic' system, which was introduced by Oldsmobile in 1939 as the first mass-market automatic transmission.
This question belongs to: Static General Knowledge Inventions and Discoveries
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