The invention of the first practical household mechanical washing machine is attributed to which developer? MCQ with Answer and Explanation

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The invention of the first practical household mechanical washing machine is attributed to which developer?

A. Thomas Edison

B. Walter Hunt

C. Elisha Otis

D. Alva J. Fisher

Answer: Option D

Solution (By JKSSB Mock Tests)

Alva J. Fisher is credited with inventing the electric-motor-driven 'Thor' washing machine, introduced by the Hurley Machine Company in 1908.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that electrical currents travel along the exterior surface of a conductor rather than uniformly through its core?

A. Michael Faraday

B. Heinrich Hertz

C. Nikola Tesla

D. James Clerk Maxwell

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Correct Answer: Option A

Explanation:
Michael Faraday discovered the skin effect and structural shielding principles, leading to the creation of the Faraday Cage.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered the exact relationship between mechanical work done and heat generated, leading to the SI unit of energy?

A. Rudolf Clausius

B. Lord Kelvin

C. James Watt

D. James Prescott Joule

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Correct Answer: Option D

Explanation:
James Prescott Joule established the mechanical equivalent of heat through rigorous thermodynamic experiments.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who is credited with the invention of the submarine 'Turtle', used in military action?

A. John Philip Holland

B. David Bushnell

C. Cornelis Drebbel

D. Robert Fulton

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Correct Answer: Option B

Explanation:
David Bushnell invented the Turtle in 1775, the first submarine ever used in combat.

This question belongs to: Static General Knowledge Inventions and Discoveries

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