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. Alva J. Fisher

C. Elisha Otis

D. Walter Hunt

Answer: Option B

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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Who discovered that elements display periodic physical attributes when arranged strictly by atomic weight values?

A. Dmitri Mendeleev and Julius Lothar Meyer

B. Henry Moseley

C. John Dalton

D. Antoine Lavoisier

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Correct Answer: Option A

Explanation:
Mendeleev and Meyer independently formulated structural periodic tables, but Mendeleev gained fame by accurately predicting undiscovered elements.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that electric fields can split light spectral lines, a physical phenomenon known as the Stark Effect?

A. Johannes Stark

B. Pieter Zeeman

C. Hendrik Lorentz

D. Max Planck

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Correct Answer: Option A

Explanation:
Johannes Stark discovered the electric splitting of hydrogen spectral lines in 1913, winning the 1919 Nobel Prize in Physics.

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Question #3

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

A. Robert Hooke

B. Isaac Newton

C. Johannes Kepler

D. Galileo Galilei

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Correct Answer: Option B

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

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