The invention of the mechanical printing press was dramatically optimized by Gutenberg using an alloy of which metals? MCQ with Answer and Explanation

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The invention of the mechanical printing press was dramatically optimized by Gutenberg using an alloy of which metals?

A. Iron and Carbon

B. Gold and Silver

C. Copper and Zinc

D. Lead, Tin, and Antimony

Answer: Option D

Solution (By JKSSB Mock Tests)

Gutenberg formulated a specialized type metal alloy that melted at low temperatures but resisted high casting pressures.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered the law of planetary gravitation, formalizing that attractive force is inversely proportional to square distance?

A. Isaac Newton

B. Galileo Galilei

C. Johannes Kepler

D. Robert Hooke

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Correct Answer: Option A

Explanation:
Sir Isaac Newton published the Universal Law of Gravitation in his monumental work 'Principia Mathematica' in 1687.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered Hydrogen gas, which he called 'inflammable air'?

A. Henry Cavendish

B. John Dalton

C. Joseph Priestley

D. Antoine Lavoisier

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Correct Answer: Option A

Explanation:
Henry Cavendish isolated hydrogen gas in 1766 and recognized it as a discrete substance.

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Question #3

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Who invented the first practical, safe, non-flickering miner's safety lamp alongside Humphry Davy?

A. Robert Fulton

B. Thomas Newcomen

C. George Stephenson

D. James Watt

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Correct Answer: Option C

Explanation:
George Stephenson independently invented a similar safety lamp (Geordie lamp) in 1815, around the exact same time as Davy.

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