Who discovered the presence of the complex radioactive element Plutonium in 1940? MCQ with Answer and Explanation

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Who discovered the presence of the complex radioactive element Plutonium in 1940?

A. Glenn T. Seaborg and his team

B. Lise Meitner

C. Enrico Fermi

D. Otto Hahn

Answer: Option A

Solution (By JKSSB Mock Tests)

Glenn Seaborg, Edwin McMillan, Joseph Kennedy, and Arthur Wahl isolated plutonium-238 via deuteron bombardment of uranium.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that light waves shift in frequency relative to the relative motion between the source and observer?

A. Edwin Hubble

B. Albert Einstein

C. Heinrich Hertz

D. Christian Doppler

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Correct Answer: Option D

Explanation:
Christian Doppler proposed the Doppler Effect in 1842, which applies uniformly to both acoustic sound pitch adjustments and optical stellar shifts.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who invented the standard mechanical marine propeller that replaced paddle wheels on ships?

A. John Ericsson and Francis Pettit Smith

B. Charles Parsons

C. Robert Fulton

D. James Watt

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Correct Answer: Option A

Explanation:
Ericsson and Smith independently patented efficient screw propeller designs in 1836, enabling faster transoceanic transport.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who formulated the Laws of Planetary Motion?

A. Johannes Kepler

B. Isaac Newton

C. Nicolaus Copernicus

D. Galileo Galilei

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Correct Answer: Option A

Explanation:
Johannes Kepler formulated the three laws of planetary motion in the early 17th century.

This question belongs to: Static General Knowledge Inventions and Discoveries

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