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Who was the first to demonstrate that the Earth orbits the Sun?

  • (A) Galileo Galilei
  • (B) Johannes Kepler
  • (C) Isaac Newton
  • (D) Nicolaus Copernicus

Answer: Nicolaus Copernicus

Nicolaus Copernicus proposed the heliocentric model, showing that the Earth orbits the Sun.

Who developed the atomic model known as the Bohr model?

  • (A) Niels Bohr
  • (B) Albert Einstein
  • (C) Werner Heisenberg
  • (D) Louis de Broglie

Answer: Niels Bohr

Niels Bohr developed the Bohr model of the atom, which explained electron orbits in atoms.

Who discovered the law of universal gravitation?

  • (A) Galileo Galilei
  • (B) Isaac Newton
  • (C) Johannes Kepler
  • (D) Albert Einstein

Answer: Isaac Newton

Isaac Newton formulated the law of universal gravitation, which describes the force of attraction between masses.

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Who invented the first electric light bulb?

  • (A) Nikola Tesla
  • (B) Thomas Edison
  • (C) Michael Faraday
  • (D) Benjamin Franklin

Answer: Thomas Edison

Thomas Edison is credited with inventing the first commercially successful electric light bulb.

Who discovered the polio vaccine?

  • (A) Edward Jenner
  • (B) Albert Sabin
  • (C) Louis Pasteur
  • (D) Jonas Salk

Answer: Jonas Salk

Jonas Salk developed the polio vaccine in 1955, helping to reduce the global impact of polio.

Who is known for his work on the theory of evolution?

  • (A) Jean-Baptiste Lamarck
  • (B) Gregor Mendel
  • (C) Charles Darwin
  • (D) Alfred Russel Wallace

Answer: Charles Darwin

Charles Darwin is known for developing the theory of evolution through natural selection.

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Who is known for the discovery of radioactivity?

  • (A) Albert Einstein
  • (B) Henri Becquerel
  • (C) Marie Curie
  • (D) Ernest Rutherford

Answer: Henri Becquerel

Henri Becquerel discovered radioactivity in 1896, laying the foundation for modern nuclear physics.

Who developed the concept of natural selection?

  • (A) Charles Darwin
  • (B) Gregor Mendel
  • (C) Alfred Russel Wallace
  • (D) Jean-Baptiste Lamarck

Answer: Charles Darwin

Charles Darwin developed the theory of natural selection, explaining the mechanism of evolution.

Who is credited with discovering X-rays?

  • (A) Marie Curie
  • (B) Wilhelm Roentgen
  • (C) Albert Einstein
  • (D) Niels Bohr

Answer: Wilhelm Roentgen

Wilhelm Roentgen discovered X-rays in 1895, which revolutionized medicine and physics.

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Who formulated the theory of quantum mechanics?

  • (A) Albert Einstein
  • (B) Max Planck
  • (C) Niels Bohr
  • (D) Werner Heisenberg

Answer: Max Planck

Max Planck is credited with formulating the theory of quantum mechanics, which describes energy in discrete quantities.

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