The expanding nature of the universe was discovered by which astronomer? MCQ with Answer and Explanation

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The expanding nature of the universe was discovered by which astronomer?

A. Edwin Hubble

B. Johannes Kepler

C. Galileo Galilei

D. Albert Einstein

Answer: Option A

Solution (By JKSSB Mock Tests)

Edwin Hubble discovered in 1929 that galaxies are moving away from each other, indicating that the universe is expanding.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that the speed of chemical reactions increases when specific non-consumed agents are added, coining the term 'Catalysis'?

A. Robert Boyle

B. Antoine Lavoisier

C. Wilhelm Ostwald

D. Jöns Jacob Berzelius

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Correct Answer: Option D

Explanation:
Berzelius identified chemical catalytic force in 1835, which Ostwald later formalized thermodynamically.

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Question #2

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The invention of the common electric toaster mechanism was achieved using nichrome wire by whom?

A. Thomas Edison

B. Albert Marsh and George Schneider

C. Nikola Tesla

D. Elisha Otis

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Correct Answer: Option B

Explanation:
Albert Marsh patented Nichrome resistance wire alloy, which enabled safe high-heat cycling within appliances like toasters.

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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. William Herschel

C. Johann Wilhelm Ritter

D. Wilhelm Röntgen

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Correct Answer: Option C

Explanation:
Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.

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