Q. The periodic table was developed by:

  • (A) John Dalton
  • (B) Dmitri Mendeleev
  • (C) Niels Bohr
  • (D) Rutherford
๐Ÿ“ Notes
โœ… Correct Answer: (B) Dmitri Mendeleev
Explanation: Dmitri Mendeleev developed the periodic table.

Q. Radioactivity was discovered by:

  • (A) Henri Becquerel
  • (B) Marie Curie
  • (C) Ernest Rutherford
  • (D) J.J. Thomson
๐Ÿ“ Notes
โœ… Correct Answer: (A) Henri Becquerel
Explanation: Henri Becquerel discovered radioactivity in 1896.

Q. Radium was discovered by:

  • (A) Henri Becquerel
  • (B) Madam Curie
  • (C) J.J. Thomson
  • (D) James Chadwick
๐Ÿ“ Notes
โœ… Correct Answer: (B) Madam Curie
Explanation: Marie Curie (Madam Curie) discovered radium.

Q. The photoelectric effect was explained by:

  • (A) Max Planck
  • (B) Albert Einstein
  • (C) Niels Bohr
  • (D) Newton
๐Ÿ“ Notes
โœ… Correct Answer: (B) Albert Einstein
Explanation: Albert Einstein explained the photoelectric effect.

Q. X-rays were discovered by:

  • (A) Roentgen
  • (B) Faraday
  • (C) Bohr
  • (D) Planck
๐Ÿ“ Notes
โœ… Correct Answer: (A) Roentgen
Explanation: Wilhelm Conrad Roentgen discovered X-rays.

Q. Who discovered the electron?

  • (A) Ernest Rutherford
  • (B) James Chadwick
  • (C) J.J. Thomson
  • (D) John Dalton
๐Ÿ“ Notes
โœ… Correct Answer: (C) J.J. Thomson
Explanation: J.J. Thomson discovered the electron in 1897.

Q. Quantum theory was proposed by:

  • (A) Albert Einstein
  • (B) Max Planck
  • (C) Niels Bohr
  • (D) Rutherford
๐Ÿ“ Notes
โœ… Correct Answer: (B) Max Planck
Explanation: Max Planck proposed the quantum theory.

Q. The principle of relativity is associated with:

  • (A) Newton
  • (B) Albert Einstein
  • (C) Galileo
  • (D) Kepler
๐Ÿ“ Notes
โœ… Correct Answer: (B) Albert Einstein
Explanation: Albert Einstein proposed the theory of relativity.

Q. Who discovered the proton?

  • (A) Ernest Rutherford
  • (B) J.J. Thomson
  • (C) James Chadwick
  • (D) Niels Bohr
๐Ÿ“ Notes
โœ… Correct Answer: (A) Ernest Rutherford
Explanation: Ernest Rutherford is credited with the discovery of the proton.

Q. The neutron was discovered by:

  • (A) Rutherford
  • (B) James Chadwick
  • (C) Faraday
  • (D) Einstein
๐Ÿ“ Notes
โœ… Correct Answer: (B) James Chadwick
Explanation: James Chadwick discovered the neutron in 1932.

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