NEET 2026 — Physics solution

NEET2026Physics

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 :

A
A and D are true, but B and C are false
B
B and D are true, but A and C are false
C
B and C are true, but A and D are false
D
A and C are true, but B and D are false

Solution

Nuclear radius $R \propto A^{1/3}$ , so volume $V \propto R^{3} \propto A$ . Hence B is true and A is false.

The mass defect is defined as the difference between the sum of masses of the constituents (protons + neutrons) and the actual mass of the nucleus, so D is true and C is false (the difference between mass of atom and its nucleus is essentially the mass of electrons, not the mass defect).

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