Nuclear size (volume proportional to mass number) and mass defect

2026 1 question

1. Four statements are given (A is mass number): I. The volume of a nucleus is proportional to $A^{1/3}$. II. The volume of a nucleus is proportional to A. III. The difference in mass of an atom and its nucleus is called the mass defect. IV. The difference in mass of a nucleus and its constituents is called the mass defect. Choose the CORRECT answer from the options given below: