Who discovered that the planet Venus has phases similar to the Moon, supporting the heliocentric theory? MCQ with Answer and Explanation

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Who discovered that the planet Venus has phases similar to the Moon, supporting the heliocentric theory?

A. Johannes Kepler

B. Galileo Galilei

C. Tycho Brahe

D. Nicolaus Copernicus

Answer: Option B

Solution (By JKSSB Mock Tests)

Galileo Galilei observed the phases of Venus in 1610 using his telescope, confirming that it orbits the Sun.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the first practical steam engine locomotive deployed on standard industrial rail layouts was done by whom?

A. James Watt

B. Richard Trevithick

C. George Stephenson

D. Thomas Newcomen

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Correct Answer: Option B

Explanation:
Trevithick designed the first functional railway steam locomotive in 1804 for the Penydarren ironworks track.

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Question #2

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Who invented the safety elevator in 1852, which prevented the cab from falling if the cable broke?

A. Henry Bessemer

B. James Watt

C. Thomas Edison

D. Elisha Otis

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Correct Answer: Option D

Explanation:
Elisha Otis invented the elevator safety brake in 1852, making skyscrapers practical and safe.

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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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