Question Paper
Class / Subject: Class 9 (CBSE) · Science
Chapter: Chapter 4 — Chapter 4: Structure of the Atom
Time Allowed: 15 minutes
Max Marks: 6
1. The nucleus of an atom contains: [1]
(A) protons and neutrons
(B) only electrons
(C) only protons
(D) only neutrons
2. The atomic number of an element is determined by its number of: [1]
(A) protons
(B) neutrons
(C) electrons only
(D) isotopes
3. Atoms of the same element with different numbers of neutrons are called: [1]
(A) isotopes
(B) ions
(C) molecules
(D) compounds
4. The maximum electrons in the K shell (n=1) is: [1]
(A) 2
(B) 8
(C) 18
(D) 32
5. The maximum number of electrons in the L shell (n=2) is: [1]
(A) 8
(B) 2
(C) 18
(D) 4
6. An element's chemical behaviour is largely determined by electrons in its: [1]
(A) outermost shell
(B) innermost shell
(C) nucleus
(D) neutrons