Who is credited with the invention of the submarine 'Turtle', used in military action? MCQ with Answer and Explanation

Question
Who is credited with the invention of the submarine 'Turtle', used in military action?
A. Cornelis Drebbel
B. John Philip Holland
C. Robert Fulton
D. David Bushnell
Answer: Option D
Solution (By JKSSB Mock Tests)
David Bushnell invented the Turtle in 1775, the first submarine ever used in combat.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered that elements display unique crystalline patterns when rapidly frozen from molten metal matrices, founding physical Metallurgy?
A. Henry Bessemer
B. Dmitri Mendeleev
C. Henry Clifton Sorby
D. Antoine Lavoisier
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Correct Answer: Option C

Explanation:
Sorby applied microscopic analysis to polished iron and steel samples, establishing microstructure phase boundaries.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered the first recognized hormonal messenger molecule in the human body, Secretin?
A. William Bayliss and Ernest Starling
B. Frederick Banting
C. Charles Best
D. Karl Landsteiner
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Correct Answer: Option A

Explanation:
Bayliss and Starling isolated secretin in 1902, discovering chemical signaling loops that function independently of direct nervous inputs.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the first practical automatic electronic computational tracking engine, the Colossus, was engineered by whom?
A. Tommy Flowers
B. Charles Babbage
C. Alan Turing
D. John von Neumann
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Correct Answer: Option A

Explanation:
Tommy Flowers designed the thermionic valve-based Colossus computer for British codebreakers at Bletchley Park to crack German Lorenz ciphers.
This question belongs to: Static General Knowledge Inventions and Discoveries
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