Who discovered that the planet Saturn possesses a second massive satellite moon named Rhea? MCQ with Answer and Explanation

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Who discovered that the planet Saturn possesses a second massive satellite moon named Rhea?

A. Christiaan Huygens

B. William Herschel

C. Giovanni Domenico Cassini

D. Galileo Galilei

Answer: Option C

Solution (By JKSSB Mock Tests)

Cassini discovered Rhea in 1672, alongside Tethys, Dione, and Iapetus, using long focal length aerial telescopes.

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Question #1

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Who invented the first practical alternating current (AC) motor and power transmission system?

A. Nikola Tesla

B. George Westinghouse

C. Michael Faraday

D. Thomas Edison

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Correct Answer: Option A

Explanation:
Nikola Tesla patented the AC induction motor and polyphase system, which revolutionized long-distance electrical grid power distribution.

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Question #2

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The invention of Teflon (PTFE) was an accidental discovery by which chemist in 1938?

A. Wallace Carothers

B. Gideon Sundback

C. Roy Plunkett

D. Leo Baekeland

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Correct Answer: Option C

Explanation:
Roy J. Plunkett accidentally discovered polytetrafluoroethylene (Teflon) while researching alternative chlorofluorocarbon refrigerants.

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Question #3

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The invention of the common chemical matchstick containing safer amorphous red phosphorus instead of toxic white phosphorus is called what?

A. Lucifer Match

B. Friction Match

C. Congreve Match

D. Safety Match

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Correct Answer: Option D

Explanation:
John Edvard Lundström developed the commercial safety match in Sweden by putting red phosphorus on the striking strip rather than the match head.

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