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

Question

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

A. Max Planck

B. Albert Michelson

C. Hendrik Lorentz

D. Albert Einstein

Answer: Option D

Solution (By JKSSB Mock Tests)

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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Question #1

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The invention of the highly flexible modern structural material known as Synthetic Rubber (Buna) was developed where?

A. England

B. Germany by IG Farben laboratories

C. Russia

D. United States

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Correct Answer: Option B

Explanation:
German chemists synthesized sodium-catalyzed butadiene copolymers (Buna-S and Buna-N) to secure alternative industrial resources.

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Question #2

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The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom?

A. Walter Hunt

B. Christopher Sholes

C. Nicolas Conté

D. John Lee Love

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Correct Answer: Option D

Explanation:
African-American inventor John Lee Love patented the simple, functional portable mechanical sharpener layout ('Love Sharpener') in 1897.

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Question #3

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Who invented the modern electronic television system utilizing a cathode ray tube (CRT)?

A. Thomas Edison

B. John Logie Baird

C. Philo Farnsworth

D. Guglielmo Marconi

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Correct Answer: Option C

Explanation:
Philo Farnsworth invented the first fully functional all-electronic television system with an image dissector camera tube.

This question belongs to: Static General Knowledge Inventions and Discoveries

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