Who invented the first commercially practical incandescent light bulb in 1879? MCQ with Answer and Explanation

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Who invented the first commercially practical incandescent light bulb in 1879?

A. Humphry Davy

B. Nikola Tesla

C. Joseph Swan

D. Thomas Edison

Answer: Option D

Solution (By JKSSB Mock Tests)

Thomas Alva Edison developed a fully practical carbon-filament incandescent lamp and public power utility system.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

Who invented the multi-matrix code known as the QR (Quick Response) Code in 1994?

A. Alan Turing

B. Masahiro Hara

C. Norman Joseph Woodland

D. Tim Berners-Lee

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Correct Answer: Option B

Explanation:
Masahiro Hara from the Japanese company Denso Wave invented the QR code in 1994 to track automobile components during assembly.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

Who discovered that the planet Saturn possesses a second massive satellite moon named Rhea?

A. Christiaan Huygens

B. William Herschel

C. Galileo Galilei

D. Giovanni Domenico Cassini

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Correct Answer: Option D

Explanation:
Cassini discovered Rhea in 1672, alongside Tethys, Dione, and Iapetus, using long focal length aerial telescopes.

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Question #3

Who formulated the Laws of Planetary Motion?

A. Galileo Galilei

B. Johannes Kepler

C. Isaac Newton

D. Nicolaus Copernicus

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Correct Answer: Option B

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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