Structure of the Atom Class 9 MCQs with Answers
Structure of the Atom Class 9 MCQs with Answers & Explanations
Class: 9 |
Subject: Science |
Section: Chemistry |
Topic: Structure of the Atom
Based on: CBSE Board Examinations (NCERT Syllabus)
Based on: CBSE Board Examinations (NCERT Syllabus)
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 9 Science examination preparation.
1. The negatively charged particle in an atom is:
Answer: C
Explanation: Electrons carry negative charge and revolve around the nucleus in shells.
Explanation: Electrons carry negative charge and revolve around the nucleus in shells.
2. Proton was discovered by:
Answer: C — Through canal rays experiment.
3. Neutron was discovered by:
Answer: B — In 1932.
4. Atomic number equals:
Answer: A — Defines the element.
5. Mass number =
Answer: B — Total nucleons.
6. Electrons revolve in:
Answer: B — As per Bohr model.
7. Maximum electrons in K shell:
Answer: C — Formula 2n².
8. Valence electrons are in:
Answer: C — Determine reactivity.
9. Isotopes have same:
Answer: B — Different neutrons.
10. Example of isotope:
Answer: A.
11. Isobars have same:
Answer: B.
12. Rutherford experiment used:
Answer: A.
13. Nucleus charge is:
Answer: B.
14. Atomic mass unit symbol:
Answer: C.
15. Bohr model explains:
Answer: A.
16. Neutral atom has:
Answer: A.
17. Atomic number of oxygen:
Answer: C.
18. Electron charge:
Answer: B.
19. Neutrons located in:
Answer: B.
20. Valency depends on:
Answer: B — Outermost electrons determine bonding.