The invention of the common mechanical device known as the marine depth tracker Echo Sounder was patented by whom? MCQ with Answer and Explanation

Question
The invention of the common mechanical device known as the marine depth tracker Echo Sounder was patented by whom?
A. Heinrich Hertz
B. Guglielmo Marconi
C. Robert Watson-Watt
D. Alexander Behm
Answer: Option D
Solution (By JKSSB Mock Tests)
German physicist Alexander Behm patented the sonic echo sounder depth locator apparatus in 1912 to prevent marine collisions.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance?
A. Johannes Kepler
B. Isaac Newton
C. Robert Hooke
D. Galileo Galilei
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Correct Answer: Option B

Explanation:
Sir Isaac Newton published the Universal Law of Gravitation in his monumental work 'Principia Mathematica' in 1687.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered the primary biological pattern detailing that DNA nucleotide bases match in specific pairs ($A=T, G=C$)?
A. Erwin Chargaff
B. Rosalind Franklin
C. James Watson
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Correct Answer: Option A

Explanation:
Chargaff's Rules established the 1:1 stoichiometric ratios of purines to pyrimidines, providing a key clue for Watson and Crick's model.
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The concept of Continental Drift was proposed by which scientist in 1912?
A. James Hutton
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Correct Answer: Option C

Explanation:
Alfred Wegener published the hypothesis that continents were once joined in a supercontinent named Pangaea and drifted apart.
This question belongs to: Static General Knowledge Inventions and Discoveries
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