Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin? MCQ with Answer and Explanation

Question
Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin?
A. Louis Pasteur
B. Alexander Fleming
C. Robert Koch
D. Selman Waksman
Answer: Option D
Solution (By JKSSB Mock Tests)
Selman Waksman and his student H. Boyd Woodruff isolated actinomycin in 1940, sparking targeted soil microbe screening programs.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of the first practical household mechanical washing machine is attributed to which developer?
A. Elisha Otis
B. Walter Hunt
C. Alva J. Fisher
D. Thomas Edison
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Correct Answer: Option C

Explanation:
Alva J. Fisher is credited with inventing the electric-motor-driven 'Thor' washing machine, introduced by the Hurley Machine Company in 1908.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered the element Potassium via electrolytic extraction shortly after isolating Sodium?
A. Jöns Jacob Berzelius
B. Antoine Lavoisier
C. Humphry Davy
D. Michael Faraday
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Correct Answer: Option C

Explanation:
Sir Humphry Davy isolated potassium in 1807 by running current through molten caustic potash ($KOH$).
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The concept of 'Inertia' was first formulated by which scientist before being formalized into laws by Newton?
A. Aristotle
B. Galileo Galilei
C. Nicolaus Copernicus
D. Johannes Kepler
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Correct Answer: Option B

Explanation:
Galileo Galilei developed the early concept of inertia, which Isaac Newton later refined into his First Law of Motion.
This question belongs to: Static General Knowledge Inventions and Discoveries
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