Questions on Plum Pudding Atomic Model
20 Multiple-Choice Questions: Plum Pudding Atomic Model
1. Who proposed the Plum Pudding Model of the atom?
A) Ernest Rutherford
B) Robert Millikan
C) Niels Bohr
D) J.J. Thomson
E) John Dalton
2. The Plum Pudding Model was developed after the discovery of the:
A) Proton
B) Nucleus
C) Electron
D) Neutron
E) Atomic number
3. In the Plum Pudding Model, what does the “pudding” represent?
A) Protons
B) Electrons
C) Empty space
D) Positive charge
E) Atomic mass
4. The electrons in the Plum Pudding Model are embedded:
A) In the nucleus
B) On the surface of the atom
C) In a positively charged sphere
D) Randomly orbiting the atom
E) Outside the atom entirely
5. Which experiment later disproved the Plum Pudding Model?
A) Oil Drop Experiment
B) Rutherford’s Gold Foil Experiment
C) Bohr’s Hydrogen Spectra
D) Cathode Ray Tube
E) Faraday’s Electrolysis
6. What did J.J. Thomson discover that led to his model?
A) The nucleus
B) The proton
C) The electron
D) The neutron
E) Isotopes
7. In the Plum Pudding Model, the atom is considered to be:
A) Mostly empty space
B) Solid and positively charged with embedded electrons
C) Made of orbiting protons
D) Electrically neutral with a dense center
E) Containing shells for electrons
8. What major flaw was revealed by Rutherford’s experiment regarding the Plum Pudding Model?
A) Electrons don’t exist
B) Atoms are not spherical
C) Atoms are mostly empty space with a nucleus
D) Protons are heavier than neutrons
E) The atom is negatively charged
9. The Plum Pudding Model described the atom as:
A) A small dense nucleus surrounded by electrons
B) A dense core with orbiting neutrons
C) A cloud of neutrons and protons
D) A positive mass with embedded electrons
E) A nucleus with energy levels
10. Which subatomic particle was NOT known when the Plum Pudding Model was created?
A) Electron
B) Proton
C) Neutron
D) Positron
E) All were known
11. What year did J.J. Thomson propose the Plum Pudding Model?
A) 1803
B) 1897
C) 1904
D) 1911
E) 1925
12. According to the Plum Pudding Model, the overall charge of the atom is:
A) Negative
B) Positive
C) Zero
D) Varies
E) Unknown
13. The Plum Pudding Model is also known as the:
A) Nuclear Model
B) Bohr Model
C) Chocolate Chip Cookie Model
D) Electron Shell Model
E) Planetary Model
14. J.J. Thomson’s model was primarily based on which type of experiment?
A) Oil drop
B) Gold foil
C) Spectroscopy
D) Cathode ray tube
E) Cloud chamber
15. Why was it called the “Plum Pudding” Model?
A) It had neutrons in clumps
B) It resembled a fruitcake with embedded particles
C) It showed atoms were spherical
D) It predicted atomic orbitals
E) It was based on Rutherford's theory
16. Which of the following was NOT a prediction of the Plum Pudding Model?
A) Atoms are neutral
B) Electrons are present
C) Atoms have a dense nucleus
D) Positive and negative charges are distributed evenly
E) Electrons are embedded in positive matter
17. The Plum Pudding Model could not explain:
A) The behavior of electrons in a vacuum
B) The mass of the atom
C) Atomic spectra and nuclear scattering
D) The bonding of oxygen
E) Conservation of charge
18. What replaced the Plum Pudding Model?
A) Dalton’s Atomic Theory
B) Bohr Model
C) Quantum Mechanical Model
D) Rutherford Model
E) Thomson’s Electron Shell Model
19. In the Plum Pudding Model, what held the atom together?
A) Gravitational attraction
B) Magnetic fields
C) A strong nuclear force
D) Balance of positive and negative charges
E) Electron shells
20. How did the Plum Pudding Model view the atom's mass distribution?
A) Concentrated in the center
B) In orbitals
C) Spread evenly throughout
D) Only in electrons
E) Found in the neutron
Answers with Explanations
1. D – J.J. Thomson proposed the Plum Pudding Model.
2. C – The model was proposed after the discovery of the electron.
3. D – The “pudding” is the positive charge that surrounds the electrons.
4. C – Electrons are embedded in a positive sphere, like plums in pudding.
5. B – Rutherford’s Gold Foil Experiment disproved the model.
6. C – Thomson discovered the electron using a cathode ray tube.
7. B – The model depicted atoms as solid positive mass with embedded electrons.
8. C – Rutherford showed that atoms have a small dense nucleus, not a uniform mass.
9. D – The atom was viewed as a positive sphere with electrons stuck in it.
10. C – The neutron was not yet discovered.
11. C – The model was proposed in 1904.
12. C – Atoms were considered electrically neutral in the model.
13. C – It’s also called the Chocolate Chip Cookie Model.
14. D – Thomson’s work was based on cathode ray tube experiments.
15. B – Because the model resembled a fruitcake (plum pudding) with embedded particles.
16. C – The existence of a dense nucleus was not part of the model.
17. C – The model failed to explain atomic spectra and nuclear scattering results.
18. D – The Rutherford Model replaced it, introducing the nucleus.
19. D – The atom was held together by electrostatic balance.
20. C – The mass and charge were thought to be evenly distributed.
- Questions on Gold Foil Experiment
- Questions on the Atomic Nucleus
- Questions on Atomic Number
- Chemistry Questions with Answers Key.
Practical Classroom Applications
- Compare the Plum Pudding Model with Dalton's and Rutherford's atomic models.
- Use timelines to illustrate the evolution of atomic theory.
- Discuss how the discovery of the electron influenced scientific understanding.
- Analyze the strengths and limitations of early atomic models.
- Encourage students to evaluate how scientific models change with new evidence.
- Use diagrams and animations to visualize Thomson's representation of the atom.
- Develop inquiry-based lessons focused on the history of chemistry.
- Prepare students for chemistry examinations and standardized science assessments.
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