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211.

Who is known for the discovery of the double-helix structure of DNA, which revolutionized the field of genetics?

James Watson and Francis Crick

Rosalind Franklin

Alfred Hershey and Martha Chase

Gregor Mendel

Explanation Comments

Answer: James Watson and Francis Crick

Explanation:

James Watson and Francis Crick are known for discovering the double-helix structure of DNA in 1953, one of the most significant discoveries in biology.

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212.

Who invented the first practical photographic process, the daguerreotype?

Ansel Adams

George Eastman

Eadweard Muybridge

Louis Daguerre

Explanation Comments

Answer: Louis Daguerre

Explanation:

Louis Daguerre invented the daguerreotype, the first practical photographic process, in the 1830s.

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213.

Who is known for the development of the theory of general relativity, which extended Einstein's earlier theory of special relativity?

Albert Einstein

Niels Bohr

Max Planck

Werner Heisenberg

Explanation Comments

Answer: Albert Einstein

Explanation:

Albert Einstein developed the theory of general relativity, which extended his earlier theory of special relativity and revolutionized our understanding of gravity.

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214.

Who is credited with inventing the first practical sewing machine, which greatly improved textile production?

Isaac Singer

Samuel Morse

Thomas Edison

Elias Howe

Explanation Comments

Answer: Elias Howe

Explanation:

Elias Howe is credited with inventing the first practical sewing machine, which had a significant impact on textile production and the clothing industry.

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215.

Who discovered the law of conservation of energy and formulated the first law of thermodynamics?

Benjamin Franklin

Michael Faraday

James Prescott Joule

James Clerk Maxwell

Explanation Comments

Answer: James Prescott Joule

Explanation:

James Prescott Joule discovered the law of conservation of energy and formulated the first law of thermodynamics, known as the law of energy conservation.

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216.

Who developed the first successful polio vaccine administered orally rather than by injection?

Louis Pasteur

Edward Jenner

Jonas Salk

Albert Sabin

Explanation Comments

Answer: Albert Sabin

Explanation:

Albert Sabin developed the first successful oral polio vaccine, an alternative to the injected vaccine developed by Jonas Salk.

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217.

Who is known for his groundbreaking work on the theory of electromagnetism and the development of the electromagnetic wave equation, which predicted the existence of electromagnetic waves?

James Clerk Maxwell

Albert Einstein

Michael Faraday

Isaac Newton

Explanation Comments

Answer: James Clerk Maxwell

Explanation:

James Clerk Maxwell made significant contributions to the theory of electromagnetism, and his equations predicted the existence of electromagnetic waves, which include radio waves and light.

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218.

Who developed the first practical steam engine and is often considered the father of the Industrial Revolution?

Thomas Edison

Alexander Graham Bell

Nikola Tesla

James Watt

Explanation Comments

Answer: James Watt

Explanation:

James Watt is known for his improvements to the steam engine, making it practical and more efficient, which played a crucial role in the Industrial Revolution.

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219.

Who discovered radium and polonium and conducted pioneering research on radioactivity?

Marie Curie

Irene Joliot-Curie

Lise Meitner

Rosalind Franklin

Explanation Comments

Answer: Marie Curie

Explanation:

Marie Curie is known for her discovery of radium and polonium and her pioneering research on radioactivity, which earned her two Nobel Prizes.

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220.

Who is famous for developing the first vaccine for smallpox, a disease that was widespread in the 18th century?

Edward Jenner

Robert Koch

Louis Pasteur

Jonas Salk

Explanation Comments

Answer: Edward Jenner

Explanation:

Edward Jenner developed the first vaccine for smallpox, demonstrating the concept of vaccination and leading to the eventual eradication of the disease.

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