The first accurate measurement of the speed of light using astronomical observations of Jupiter's moons was performed by whom? MCQ with Answer and Explanation

Question
The first accurate measurement of the speed of light using astronomical observations of Jupiter's moons was performed by whom?
A. Armand Fizeau
B. Léon Foucault
C. Albert Michelson
D. Ole Rømer
Answer: Option D
Solution (By JKSSB Mock Tests)
Danish astronomer Ole Rømer made the first quantitative measurement of the speed of light in 1676.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered the first biological enzyme, Diastase, which breaks down starches into sugars?
A. Hans Krebs
B. Anselme Payen
C. Louis Pasteur
D. Alexander Fleming
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Correct Answer: Option B

Explanation:
French chemist Anselme Payen isolated diastase from barley malt in 1833, founding the scientific study of enzymes.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered that the genetic molecule DNA can transition between stable 'A' and 'B' structural forms depending on relative humidity levels?
A. James Watson
B. Maurice Wilkins
C. Rosalind Franklin
D. Francis Crick
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Correct Answer: Option C

Explanation:
Franklin's meticulous control of humidity during X-ray diffraction isolation yielded the highly detailed 'B-form' structural patterns.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered that regular arrays of atoms act as diffraction gratings for X-rays, establishing X-ray crystallography?
A. Max von Laue
B. Wilhelm Röntgen
C. Rosalind Franklin
D. William Henry Bragg
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Correct Answer: Option A

Explanation:
Max von Laue discovered X-ray diffraction by crystals in 1912, proving the wave nature of X-rays and structural lattice layouts.
This question belongs to: Static General Knowledge Inventions and Discoveries
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