The invention of the first practical steam engine locomotive deployed on standard industrial rail layouts was done by whom? MCQ with Answer and Explanation

Question

The invention of the first practical steam engine locomotive deployed on standard industrial rail layouts was done by whom?

A. Richard Trevithick

B. George Stephenson

C. James Watt

D. Thomas Newcomen

Answer: Option A

Solution (By JKSSB Mock Tests)

Trevithick designed the first functional railway steam locomotive in 1804 for the Penydarren ironworks track.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who developed the first successful polio vaccine in 1955?

A. Louis Pasteur

B. Jonas Salk

C. Albert Sabin

D. Edward Jenner

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Correct Answer: Option B

Explanation:
Jonas Salk developed the first successful inactivated polio vaccine (IPV) in 1955, while Albert Sabin later developed the oral polio vaccine.

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

A. Grote Reber

B. Guglielmo Marconi

C. Edwin Hubble

D. Karl Jansky

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Correct Answer: Option D

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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Question #3

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Who discovered the specific mathematical formula detailing gas density variation relative to molecular weight, known as the diffusion law?

A. John Dalton

B. Thomas Graham

C. Robert Boyle

D. Amadeo Avogadro

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Correct Answer: Option B

Explanation:
Graham's Law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molecular mass.

This question belongs to: Static General Knowledge Inventions and Discoveries

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