Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance? MCQ with Answer and Explanation
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Question #1
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Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared?
Correct Answer: Option A
Explanation:
Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.
Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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Who discovered that the chemical element Titanium is isolated from dark mineral iron sand matrices?
Correct Answer: Option B
Explanation:
English clergyman William Gregor discovered titanium in ilmenite mineral sands in 1791, naming it 'menaccanite'.
English clergyman William Gregor discovered titanium in ilmenite mineral sands in 1791, naming it 'menaccanite'.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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The invention of the mechanical calculating machine named 'Pascaline' in 1642 was completed by whom?
Correct Answer: Option D
Explanation:
Blaise Pascal invented the Pascaline to assist his father, a tax commissioner, in performing arithmetic addition and subtraction.
Blaise Pascal invented the Pascaline to assist his father, a tax commissioner, in performing arithmetic addition and subtraction.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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