Who invented the standard mechanical marine propeller that replaced paddle wheels on ships? MCQ with Answer and Explanation

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

A. Charles Parsons

B. James Watt

C. Robert Fulton

D. John Ericsson and Francis Pettit Smith

Answer: Option D

Solution (By JKSSB Mock Tests)

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

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Who discovered that atomic radioactive decay emits discrete high-energy electromagnetic waves named 'Gamma Rays'?

A. Henri Becquerel

B. Ernest Rutherford

C. Paul Villard

D. Marie Curie

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Correct Answer: Option C

Explanation:
French chemist Paul Villard discovered gamma radiation in 1900 while studying uranium emission shielding paths.

This question belongs to: Static General Knowledge Inventions and Discoveries

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. Explorer 1

C. COBE (Cosmic Background Explorer)

D. Voyager 1

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Correct Answer: Option C

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

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who discovered that the speed of light is constant in all inertial frames of reference, forming the basis of Special Relativity?

A. Albert Michelson

B. Max Planck

C. Hendrik Lorentz

D. Albert Einstein

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Correct Answer: Option D

Explanation:
Albert Einstein postulated that the speed of light in a vacuum is invariant, irrespective of the motion of the source or observer.

This question belongs to: Static General Knowledge Inventions and Discoveries

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