Four statements are given ( A is mass number): A. The volume of a… | NEET 2026

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Nucleus: Composition, Size & Nuclear Force

Four statements are given ( $A$ is mass number):

A. The volume of a nucleus is proportional to $A^{1/3}$ .

B. The volume of a nucleus is proportional to $A$ .

C. The difference in mass of an atom and its nucleus is called the mass defect. D. The difference in mass of a nucleus and its constituents is called the mass defect. Choose the correct answer from the options given below:

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Answer: (d)

$R = R_0 A^{1/3} \Rightarrow V = \frac{4}{3}\pi R^3 \propto A$ : A false, B true.
Mass defect $=$ (mass of constituent nucleons) $-$ (mass of nucleus): D true.
Atom minus nucleus is just the electrons' mass, not the mass defect: C false.
So the answer is (d) B and D are true.

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