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Who discovered that bacteria can be killed by heat?

  • (A) Louis Pasteur
  • (B) Robert Koch
  • (C) Joseph Lister
  • (D) Edward Jenner

Answer: Louis Pasteur

Louis Pasteur demonstrated that bacteria could be killed by heating, a process now called pasteurization.

Who invented the first working telegraph?

  • (A) Samuel Morse
  • (B) Guglielmo Marconi
  • (C) Alexander Graham Bell
  • (D) Nikola Tesla

Answer: Samuel Morse

Samuel Morse invented the first successful telegraph and the Morse code for transmitting messages.

Who is known for the first successful organ transplant?

  • (A) Christiaan Barnard
  • (B) Joseph Murray
  • (C) Norman Shumway
  • (D) Michael DeBakey

Answer: Christiaan Barnard

Christiaan Barnard performed the world?s first successful heart transplant in 1967.

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Who developed the concept of electromagnetism?

  • (A) Nikola Tesla
  • (B) Michael Faraday
  • (C) James Clerk Maxwell
  • (D) Albert Einstein

Answer: James Clerk Maxwell

James Clerk Maxwell developed the theory of electromagnetism, unifying electricity and magnetism.

Who invented the first radio transmitter?

  • (A) Nikola Tesla
  • (B) Guglielmo Marconi
  • (C) Heinrich Hertz
  • (D) James Clerk Maxwell

Answer: Guglielmo Marconi

Guglielmo Marconi invented the first practical radio transmitter and receiver, enabling long-distance wireless communication.

Who is known for the discovery of the smallpox virus?

  • (A) Edward Jenner
  • (B) Louis Pasteur
  • (C) Robert Koch
  • (D) Joseph Lister

Answer: Robert Koch

Robert Koch discovered the smallpox virus and later contributed to the development of the first vaccine.

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Who is known for discovering the nitrogen cycle?

  • (A) Fritz Haber
  • (B) Joseph Priestley
  • (C) Jean-Baptiste Boussingault
  • (D) Michael Faraday

Answer: Jean-Baptiste Boussingault

Jean-Baptiste Boussingault is credited with the discovery of the nitrogen cycle and its role in agriculture.

Who proposed the law of electrolysis?

  • (A) Dmitri Mendeleev
  • (B) Antoine Lavoisier
  • (C) Michael Faraday
  • (D) Albert Einstein

Answer: Michael Faraday

Michael Faraday formulated the laws of electrolysis, which explain the relationship between electric current and chemical reactions.

Who is known for the discovery of the hydrogen atom?

  • (A) Niels Bohr
  • (B) Ernest Rutherford
  • (C) John Dalton
  • (D) J.J. Thomson

Answer: Niels Bohr

Niels Bohr is credited with developing the Bohr model of the hydrogen atom, which helped to explain atomic structure.

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Who invented the first phonograph?

  • (A) Nikola Tesla
  • (B) Thomas Edison
  • (C) Guglielmo Marconi
  • (D) Albert Einstein

Answer: Thomas Edison

Thomas Edison invented the phonograph in 1877, the first device that could both record and reproduce sound.

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