Atomic Structure MCQ Quiz for Class 7, 8, 9 (CBSE, ICSE & State Boards)
.png "Atomic-Structure-Quiz")
Class 9 ICSE Chemistry Questions
Welcome to the ultimate Atomic Structure MCQ Quiz for Class 7, 8, and 9 students of CBSE, ICSE, and State Boards! This interactive quiz is designed to help you strengthen your understanding of one of the most important topics in chemistry—Atomic Structure.
The quiz covers key concepts such as atomic number, mass number, isotopes, and isobars, along with the discovery of electrons, protons, and neutrons. You’ll also find questions on J.J. Thomson’s atomic model, Rutherford’s gold foil experiment, and Bohr’s planetary model.
With 30 multiple-choice questions, a 10-minute timer, and instant feedback, this quiz is perfect for exam preparation, competitive exams, and science olympiads. At the end, you’ll receive a detailed score report with percentage to track your progress.
Whether you’re revising for CBSE Class 8 Science, practicing ICSE Class 9 Chemistry MCQs, or preparing for your State Board exams, this Atomic Structure quiz ensures a complete and engaging learning experience.
Start now and test your knowledge with our Atomic Structure MCQ quiz!
CBSE Class 9 Atomic Structure Questions
✅ Why Practice Atomic Structure MCQs?
The Atomic Structure chapter is the foundation of chemistry. Questions from this topic frequently appear in:
- Class 7 & 8 Science exams
- ICSE Class 9 Chemistry tests
- CBSE Class 9 Science Chapter: Structure of the Atom
- Olympiad & NTSE preparation
Key concepts covered:
- Discovery of Electrons, Protons, and Neutrons
- J.J. Thomson’s Model and Rutherford’s Gold Foil Experiment
- Bohr’s Atomic Model
- Atomic Number, Mass Number
- Isotopes and Isobars
✅ Atomic Structure MCQ Quiz Details
✔ 30 Multiple Choice Questions
✔ Topics: Atomic number, subatomic particles, isotopes, models
✔ Timer: 10 minutes for quick thinking
✔ Instant Feedback: Shows correct answer with explanation
✔ Score Report: Displays percentage and performance message
✅ Why Choose Agastya Classes for Learning?
At Agastya Classes, we provide:
Interactive quizzes for Class 7, 8, 9 ScienceExpert guidance for CBSE & ICSE students
✅ Tips to Score Full Marks in Atomic Structure
- Understand the difference between atomic number and mass number
- Learn the contributions of J.J. Thomson, Rutherford, and Bohr
- Practice numerical problems on isotopes and electronic configuration
- Revise NCERT and ICSE Chemistry chapters before attempting quizzes
Atomic Structure MCQ Quiz for Class 7, 8, 9 (CBSE, ICSE & State Boards)
💡 Related Resources:
0%
Time Remaining: 10:00
1. Who discovered the electron using the discharge tube experiment?
A) J.J. Thomson
B) Rutherford
C) Chadwick
D) Dalton
Explanation: J.J. Thomson discovered the electron using the cathode ray discharge tube experiment.
2. Which particle has a charge of +1 and mass of approximately 1 amu?
A) Proton
B) Electron
C) Neutron
D) Positron
Explanation: Proton carries +1 charge and has a mass of 1 atomic mass unit.
3. What is the charge on an electron?
A) +1.6 × 10-19 C
B) -1.6 × 10-19 C
C) 0
D) +9.1 × 10-31 kg
Explanation: Electron has a negative charge of -1.6 × 10⁻¹⁹ C.
4. Rutherford's gold foil experiment concluded that:
A) Atom has a small, dense nucleus
B) Electrons are inside the nucleus
C) Atom is indivisible
D) Nucleus has negative charge
Explanation: Rutherford discovered that the nucleus is small, dense, and positively charged.
5. Who discovered the neutron?
A) Rutherford
B) James Chadwick
C) J.J. Thomson
D) Bohr
Explanation: Neutron was discovered by James Chadwick in 1932.
6. The mass number of an atom is equal to:
A) Sum of protons and neutrons
B) Sum of electrons and protons
C) Sum of electrons and neutrons
D) Double the atomic number
Explanation: Mass number = Number of protons + Number of neutrons.
7. Which subatomic particle has negligible mass?
A) Proton
B) Electron
C) Neutron
D) Nucleon
Explanation: Electron has a mass of 9.1 × 10⁻³¹ kg, negligible compared to protons and neutrons.
8. Which model is known as the 'plum pudding' model?
A) J.J. Thomson's model
B) Rutherford's model
C) Bohr's model
D) Dalton's model
Explanation: J.J. Thomson proposed the 'plum pudding' model of the atom.
9. Isotopes are atoms having:
A) Same mass number but different atomic numbers
B) Same atomic number but different mass numbers
C) Different protons and electrons
D) Same number of neutrons
Explanation: Isotopes have the same atomic number (protons) but different mass numbers.
10. The nucleus of an atom contains:
A) Protons and neutrons
B) Protons and electrons
C) Electrons only
D) Neutrons only
Explanation: The nucleus contains protons and neutrons, collectively called nucleons.
11. The charge on the nucleus of an atom is:
A) Negative
B) Positive
C) Neutral
D) Both positive and negative
Explanation: Nucleus is positively charged due to protons.
12. Which of the following is an isotope of hydrogen?
A) Deuterium
B) Helium
C) Oxygen
D) Lithium
Explanation: Deuterium is an isotope of hydrogen with one proton and one neutron.
13. Atomic number of an element represents:
A) Number of protons
B) Number of neutrons
C) Sum of protons and neutrons
D) Number of nucleons
Explanation: Atomic number equals the number of protons in an atom.
14. Who proposed that electrons revolve in specific orbits around the nucleus?
A) Rutherford
B) Niels Bohr
C) J.J. Thomson
D) Dalton
Explanation: Bohr proposed the planetary model of the atom with fixed energy levels.
15. The relative mass of a neutron is:
A) 0
B) 1/1840
C) 1
D) 2
Explanation: Neutron has a relative mass of 1 amu, similar to a proton.
16. The cathode rays in discharge tube are made of:
A) Electrons
B) Protons
C) Neutrons
D) Nucleons
Explanation: Cathode rays are streams of electrons moving from cathode to anode.
17. Isobars are atoms having:
A) Same atomic number but different mass numbers
B) Same mass number but different atomic numbers
C) Same number of protons and neutrons
D) Same number of electrons
Explanation: Isobars have the same mass number but different atomic numbers.
18. Which scientist introduced the concept of the nucleus?
A) J.J. Thomson
B) Rutherford
C) Bohr
D) Chadwick
Explanation: Rutherford introduced the concept of nucleus after the gold foil experiment.
19. Which subatomic particle determines the identity of an element?
A) Proton
B) Neutron
C) Electron
D) Nucleon
Explanation: Proton number (atomic number) defines the element's identity.
20. The relative charge on a neutron is:
A) +1
B) -1
C) 0
D) +2
Explanation: Neutron is electrically neutral, with zero charge.
21. Which experiment proved that most of the atom is empty space?
A) Cathode ray experiment
B) Rutherford's gold foil experiment
C) J.J. Thomson's experiment
D) Bohr's model experiment
Explanation: Rutherford's gold foil experiment showed that alpha particles mostly passed through empty space in the atom.
22. The cathode rays in J.J. Thomson's experiment were deflected towards:
A) Positive plate
B) Negative plate
C) Nucleus
D) Remained undeflected
Explanation: Cathode rays are negatively charged and are attracted to the positive plate.
23. Which subatomic particle is responsible for chemical properties of an element?
A) Proton
B) Electron
C) Neutron
D) Nucleus
Explanation: Electrons, especially in the outermost shell, determine chemical properties.
24. The term 'nucleons' refers to:
A) Protons only
B) Neutrons only
C) Protons and neutrons
D) Electrons and protons
Explanation: Nucleons are particles present in the nucleus — protons and neutrons.
25. What was the major drawback of Rutherford's atomic model?
A) Could not explain existence of electrons
B) Could not explain stability of atoms
C) Could not explain the nucleus
D) Could not explain proton's charge
Explanation: Rutherford's model could not explain why electrons do not fall into the nucleus.
26. What is the relative mass of an electron compared to a proton?
A) 1/1840
B) 1
C) 1/100
D) 0
Explanation: Electron's mass is about 1/1840 of the proton's mass.
27. Which scientist proposed that atoms are indivisible and indestructible?
A) Dalton
B) J.J. Thomson
C) Rutherford
D) Bohr
Explanation: Dalton's atomic theory stated that atoms are indivisible and indestructible.
28. Which of the following statements is TRUE about isotopes?
A) They have same chemical properties but different physical properties
B) They have different chemical properties
C) They differ in number of protons
D) They differ in number of electrons
Explanation: Isotopes have same number of protons, so same chemical properties, but different masses.
29. Which element has isotopes called Protium, Deuterium, and Tritium?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Helium
Explanation: Hydrogen has three isotopes – Protium, Deuterium, and Tritium.
30. Which of the following particles revolve around the nucleus?
A) Protons
B) Neutrons
C) Electrons
D) Nucleons
Explanation: Electrons revolve around the nucleus in specific energy levels.
Report Card
Total Questions Attempted: 0
Correct Answers: 0
Wrong Answers: 0
--
.png&description=Atomic Structure MCQ Quiz for Class 7, 8, 9 | CBSE, ICSE \u0026 State Board){kind=link}