Mock Exam on the History of the Atom
Easy (1-10)
1. Who was the first person to use the term "atom"?
○ A) John Dalton
○ B) Ernest Rutherford
○ C) Democritus
○ D) J.J. Thomson
2. What did Democritus believe about matter?
○ A) Matter is made of indivisible atoms
○ B) Matter is made of water
○ C) Matter can be created
○ D) Matter is made up of protons and neutrons
3. Which of the following did John Dalton contribute to atomic theory?
M
○ A) Atoms are indivisible
○ B) Atoms can be destroyed
○ C) Atoms have electrons
○ D) Atoms do not combine to form compounds
4. Which discovery is J.J. Thomson credited with?
○ A) Neutron
○ B) Proton
AG
○ C) Electron
○ D) Nucleus
5. What did Thomson use to discover the electron?
○ A) The periodic table
○ B) Gold foil experiment
○ C) Cathode ray tube
○ D) Telescope
6. What was the name of the model proposed by Thomson?
○ A) Planetary model
○ B) Plum pudding model
○ C) Cloud model
○ D) Bohr model
7. What did Rutherford's Gold Foil Experiment reveal?
○ A) Atoms are indivisible
○ B) Atoms are mostly empty space with a dense nucleus
○ C) Electrons orbit the nucleus
○ D) Electrons are inside the nucleus
8. In Rutherford’s model, what did electrons do?
○ A) They were embedded in the nucleus
○ B) They orbited the nucleus
○ C) They were scattered randomly
, ○ D) They orbited in fixed paths
9. What did Niels Bohr propose about electrons in his model?
○ A) Electrons orbit randomly
○ B) Electrons have fixed energy levels
○ C) Electrons orbit in a continuous path
○ D) Electrons are located within the nucleus
10. What is Schrödinger’s atomic model known as?
● A) Planetary model
● B) Cloud model
● C) Plum pudding model
● D) Bohr model
Medium (11-20)
11. According to Democritus, what is the nature of atoms?
● A) They are divisible
M
● B) They have no internal structure
● C) They consist of energy
● D) They are made of electrons and protons
12. What is the main limitation of Thomson’s plum pudding model?
● A) It does not explain the movement of electrons
● B) It suggests atoms are indivisible
● C) It places protons and electrons in the nucleus
● D) It does not describe energy levels
AG
13. Why did Rutherford's experiment result in some particles deflecting back?
● A) Atoms are filled with liquid
● B) There was a dense positive center in the atom
● C) Electrons were inside the nucleus
● D) The particles were too slow
14. Which of the following describes Bohr’s idea of electron energy levels?
● A) Electrons exist in random orbits
● B) Electrons exist at fixed energy levels
● C) Electrons orbit the nucleus in a continuous circle
● D) Electrons are inside the nucleus
15. Which scientist showed that electrons could occupy certain energy levels in
orbits?
● A) Democritus
● B) John Dalton
● C) Niels Bohr
● D) Erwin Schrödinger
16. What is the basis of Schrödinger's uncertainty principle?
● A) The position of an electron can be predicted with certainty
● B) The velocity of an electron can be predicted precisely
● C) The exact position of an electron cannot be determined
● D) Electrons are found in fixed orbits
Easy (1-10)
1. Who was the first person to use the term "atom"?
○ A) John Dalton
○ B) Ernest Rutherford
○ C) Democritus
○ D) J.J. Thomson
2. What did Democritus believe about matter?
○ A) Matter is made of indivisible atoms
○ B) Matter is made of water
○ C) Matter can be created
○ D) Matter is made up of protons and neutrons
3. Which of the following did John Dalton contribute to atomic theory?
M
○ A) Atoms are indivisible
○ B) Atoms can be destroyed
○ C) Atoms have electrons
○ D) Atoms do not combine to form compounds
4. Which discovery is J.J. Thomson credited with?
○ A) Neutron
○ B) Proton
AG
○ C) Electron
○ D) Nucleus
5. What did Thomson use to discover the electron?
○ A) The periodic table
○ B) Gold foil experiment
○ C) Cathode ray tube
○ D) Telescope
6. What was the name of the model proposed by Thomson?
○ A) Planetary model
○ B) Plum pudding model
○ C) Cloud model
○ D) Bohr model
7. What did Rutherford's Gold Foil Experiment reveal?
○ A) Atoms are indivisible
○ B) Atoms are mostly empty space with a dense nucleus
○ C) Electrons orbit the nucleus
○ D) Electrons are inside the nucleus
8. In Rutherford’s model, what did electrons do?
○ A) They were embedded in the nucleus
○ B) They orbited the nucleus
○ C) They were scattered randomly
, ○ D) They orbited in fixed paths
9. What did Niels Bohr propose about electrons in his model?
○ A) Electrons orbit randomly
○ B) Electrons have fixed energy levels
○ C) Electrons orbit in a continuous path
○ D) Electrons are located within the nucleus
10. What is Schrödinger’s atomic model known as?
● A) Planetary model
● B) Cloud model
● C) Plum pudding model
● D) Bohr model
Medium (11-20)
11. According to Democritus, what is the nature of atoms?
● A) They are divisible
M
● B) They have no internal structure
● C) They consist of energy
● D) They are made of electrons and protons
12. What is the main limitation of Thomson’s plum pudding model?
● A) It does not explain the movement of electrons
● B) It suggests atoms are indivisible
● C) It places protons and electrons in the nucleus
● D) It does not describe energy levels
AG
13. Why did Rutherford's experiment result in some particles deflecting back?
● A) Atoms are filled with liquid
● B) There was a dense positive center in the atom
● C) Electrons were inside the nucleus
● D) The particles were too slow
14. Which of the following describes Bohr’s idea of electron energy levels?
● A) Electrons exist in random orbits
● B) Electrons exist at fixed energy levels
● C) Electrons orbit the nucleus in a continuous circle
● D) Electrons are inside the nucleus
15. Which scientist showed that electrons could occupy certain energy levels in
orbits?
● A) Democritus
● B) John Dalton
● C) Niels Bohr
● D) Erwin Schrödinger
16. What is the basis of Schrödinger's uncertainty principle?
● A) The position of an electron can be predicted with certainty
● B) The velocity of an electron can be predicted precisely
● C) The exact position of an electron cannot be determined
● D) Electrons are found in fixed orbits
