Who discovered that white light is a mixture of seven fundamental component colors using a prism? MCQ with Answer and Explanation

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Who discovered that white light is a mixture of seven fundamental component colors using a prism?

A. Thomas Young

B. James Clerk Maxwell

C. Christian Huygens

D. Isaac Newton

Answer: Option D

Solution (By JKSSB Mock Tests)

Sir Isaac Newton proved through prism experiments that white light decomposes into a continuous spectrum of colors.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin?

A. Alexander Fleming

B. Louis Pasteur

C. Robert Koch

D. Selman Waksman

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Correct Answer: Option D

Explanation:
Selman Waksman and his student H. Boyd Woodruff isolated actinomycin in 1940, sparking targeted soil microbe screening programs.

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Question #2

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

A. Armand Fizeau

B. Ole Rømer

C. Léon Foucault

D. Albert Michelson

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Correct Answer: Option B

Explanation:
Danish astronomer Ole Rømer made the first quantitative measurement of the speed of light in 1676.

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Question #3

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Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared?

A. Heinrich Hertz

B. Johann Wilhelm Ritter

C. William Herschel

D. Wilhelm Röntgen

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Correct Answer: Option B

Explanation:
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

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