Who discovered that the planet Uranus possesses a distinct set of narrow equatorial rings? MCQ with Answer and Explanation

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Who discovered that the planet Uranus possesses a distinct set of narrow equatorial rings?

A. William Herschel

B. James L. Elliot, Edward W. Dunham, and Douglas J. Mink

C. Giovanni Cassini

D. Galileo Galilei

Answer: Option B

Solution (By JKSSB Mock Tests)

The rings of Uranus were discovered in 1977 during airborne stellar occultation observations, when the planet blocked a background star's light.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The concept of absolute zero temperature and the thermodynamic scale was discovered by whom?

A. James Joule

B. Lord Kelvin

C. Daniel Gabriel Fahrenheit

D. Anders Celsius

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Correct Answer: Option B

Explanation:
William Thomson, later Lord Kelvin, proposed the absolute thermodynamic scale of temperature in 1848.

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Question #2

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The discovery of the cosmic radiation spectrum matching a perfect blackbody source was confirmed by which NASA satellite project?

A. Hubble Space Telescope

B. Voyager 1

C. Explorer 1

D. COBE (Cosmic Background Explorer)

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Correct Answer: Option D

Explanation:
The COBE satellite, led by John Mather and George Smoot, measured the CMB radiation perfectly, verifying Big Bang cosmological predictions.

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Question #3

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Who discovered that certain types of biological viruses infect and replicate exclusively inside bacterial cell hosts, establishing 'Bacteriophages'?

A. Frederick Twort and Félix d'Hérelle

B. Robert Koch

C. Dmitri Ivanovsky

D. Louis Pasteur

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Correct Answer: Option A

Explanation:
Twort and d'Hérelle independently isolated filterable bacterial lysis agents, establishing early phage therapeutic concepts.

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