Who discovered that the chemical element Calcium is isolated via electrolysis of lime and mercuric oxide mixtures? MCQ with Answer and Explanation

Question
Who discovered that the chemical element Calcium is isolated via electrolysis of lime and mercuric oxide mixtures?
A. Joseph Black
B. Jöns Jacob Berzelius
C. Antoine Lavoisier
D. Humphry Davy
Answer: Option D
Solution (By JKSSB Mock Tests)
Sir Humphry Davy isolated elemental calcium metal in 1808 using a mercury-cell electrolysis setup.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of synthetic nylon fiber, which replaced silk in textiles, was led by which chemist at DuPont?
A. Wallace Carothers
B. Stephanie Kwolek
C. Roy Plunkett
D. Leo Baekeland
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Correct Answer: Option A

Explanation:
Wallace Carothers invented Nylon (Polyamide 6,6) and Neoprene synthetic rubber in the 1930s.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who formulated the quantum theory, establishing that energy is emitted in discrete packets called quanta?
A. Albert Einstein
B. Werner Heisenberg
C. Max Planck
D. Louis de Broglie
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Correct Answer: Option C

Explanation:
Max Planck introduced quantum theory in 1900, originating Planck's constant ($h$), and won the 1918 Nobel Prize.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who invented the first operational safety air-brake system for high-speed railway trains?
A. George Stephenson
B. George Westinghouse
C. James Watt
D. Elisha Otis
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Correct Answer: Option B

Explanation:
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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