Who discovered the specific mathematical constant linking the energy of a photon to its frequency? MCQ with Answer and Explanation
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Question #1
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Who invented the modern zipper mechanism with interlocking teeth in its final commercial form?
Correct Answer: Option A
Explanation:
Gideon Sundback modified earlier primitive clasp locker designs into the modern 'Hookless Fastener' or zipper in 1913.
Gideon Sundback modified earlier primitive clasp locker designs into the modern 'Hookless Fastener' or zipper in 1913.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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Who discovered that stable elements possess unique integer identifiers based on X-ray emission frequencies, restructuring atomic numbers?
Correct Answer: Option C
Explanation:
Moseley proved that ordering chemical elements by nuclear charge (atomic number) resolved inconsistencies in Mendeleev's mass-ordered layout.
Moseley proved that ordering chemical elements by nuclear charge (atomic number) resolved inconsistencies in Mendeleev's mass-ordered layout.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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Who discovered that the chemical element Iodine is isolated from seaweed ash matrices?
Correct Answer: Option C
Explanation:
Bernard Courtois isolated violet iodine vapors accidentally in 1811 while adding excess sulfuric acid to seaweed extract solutions.
Bernard Courtois isolated violet iodine vapors accidentally in 1811 while adding excess sulfuric acid to seaweed extract solutions.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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