The laser (Light Amplification by Stimulated Emission of Radiation) was first constructed by whom in 1960? MCQ with Answer and Explanation

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The laser (Light Amplification by Stimulated Emission of Radiation) was first constructed by whom in 1960?

A. Albert Einstein

B. Charles Townes

C. Arthur Schawlow

D. Theodore Maiman

Answer: Option D

Solution (By JKSSB Mock Tests)

Theodore Maiman built the first functioning laser in 1960 at Hughes Research Laboratories, using a synthetic ruby crystal.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered the iconic 'Uncertainty Principle' in quantum physics?

A. Max Born

B. Erwin Schrödinger

C. Werner Heisenberg

D. Niels Bohr

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Correct Answer: Option C

Explanation:
Werner Heisenberg formulated the principle stating that the position and momentum of a subatomic particle cannot be measured simultaneously with absolute precision.

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Question #2

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The invention of the common mechanical elevator safety brake system was publicly demonstrated at the World's Fair by whom?

A. James Watt

B. Elisha Otis

C. Thomas Edison

D. Henry Bessemer

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Correct Answer: Option B

Explanation:
Otis dramatic demonstration in 1854 involved cutting the platform support rope while standing on it, proving the safety gear worked.

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Question #3

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Who discovered that cosmic celestial entities emit radio signals, establishing the branch of Radio Astronomy?

A. Guglielmo Marconi

B. Grote Reber

C. Karl Jansky

D. Edwin Hubble

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Correct Answer: Option C

Explanation:
Jansky discovered radio emission noise origins from the galactic center in 1931 using directional rotating antenna arrays at Bell Labs.

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