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Q. No.A nucleus represented by the symbol \({}_{Z}^{A}\mathrm{X}\) has:
| 1. | \(Z\) protons and \(A-Z\) neutrons |
| 2. | \(Z\) protons and \(A\) neutrons |
| 3. | \(A\) protons and \(Z-A\) neutrons |
| 4. | \(Z\) neutrons and \(A-Z\) protons |
Subtopic: Nuclear Binding Energy |
91%
Level 1: 80%+
AIPMT - 2004
Hints
The mass number of a nucleus is:
| 1. | always less than its atomic number. |
| 2. | always more than its atomic number. |
| 3. | sometimes equal to its atomic number. |
| 4. | sometimes less than and sometimes more than its atomic number. |
Subtopic: Nuclear Binding Energy |
56%
Level 3: 35%-60%
AIPMT - 2003
Hints
The stable nucleus that has a radius half of the radius of \(\mathrm{Fe}^{56}\) is:
1. \(\mathrm{Li}^7\)
2. \(\mathrm{Na}^{21}\)
3. \(\mathrm{S}^{16}\)
4. \(\mathrm{Ca}^{40}\)
1. \(\mathrm{Li}^7\)
2. \(\mathrm{Na}^{21}\)
3. \(\mathrm{S}^{16}\)
4. \(\mathrm{Ca}^{40}\)
Subtopic: Nucleus |
68%
Level 2: 60%+
Hints
Which of the following pairs of nuclei are isotones?
| 1. | \({}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}\) | 2. | \({}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}\) |
| 3. | \({}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}\) | 4. | \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\) |
Subtopic: Nuclear Binding Energy |
86%
Level 1: 80%+
Hints
The volume \((V)\) of a nucleus is related to its mass \((M)\) as:
1. \(V\propto M\)
2. \(V\propto \frac{1}{M}\)
3. \(V\propto M^3\)
4. \(V\propto \frac{1}{M^3}\)
1. \(V\propto M\)
2. \(V\propto \frac{1}{M}\)
3. \(V\propto M^3\)
4. \(V\propto \frac{1}{M^3}\)
Subtopic: Nucleus |
80%
Level 1: 80%+
Hints
If the density of the gold nucleus is \(X,\) then the density of the silver nucleus will be:
1. \(2X\)
2. \(\frac{X}{3}\)
3. \(4X\)
4. \(X\)
1. \(2X\)
2. \(\frac{X}{3}\)
3. \(4X\)
4. \(X\)
Subtopic: Nucleus |
83%
Level 1: 80%+
Hints
A nucleus of mass number \(189\) splits into two nuclei having mass numbers \(125\) and \(64.\) The ratio of the radius of two daughter nuclei respectively is:
1. \(25:16\)
2. \(1:1\)
3. \(4:5\)
4. \(5:4\)
1. \(25:16\)
2. \(1:1\)
3. \(4:5\)
4. \(5:4\)
Subtopic: Nucleus |
83%
Level 1: 80%+
NEET - 2022
Hints
The ratio of nuclear densities and nuclear volumes of \(^{56}_{26}Fe\) and \(^{4}_{2}He\) are, respectively:
| 1. | \(13:1\) and \(14:1\) | 2. | \(14:1\) and \(1:1\) |
| 3. | \(1:1\) and \(14:1\) | 4. | \(1:1\) and \(13:1\) |
Subtopic: Nucleus |
77%
Level 2: 60%+
NEET - 2024
Hints
An unknown nucleus has a nuclear density of \(2.29 \times 10^{17} ~\text{kg/m}^3\) and mass of \(19.926 \times 10^{-27} \text{ kg}\). Its mass number \(A\) is approximately:
(take \(R_0 = 1.2 \times 10^{-15} \text{ m}\), \(4\pi = 12.56\))
1. \(12\)
2. \(19\)
3. \(20\)
4. \(16\)
(take \(R_0 = 1.2 \times 10^{-15} \text{ m}\), \(4\pi = 12.56\))
1. \(12\)
2. \(19\)
3. \(20\)
4. \(16\)
Subtopic: Nucleus |
Level 3: 35%-60%
NEET - 2026
Please attempt this question first.
Hints
Please attempt this question first.
Four statements are given (\(A\) is mass numbers):
Choose the correct answer from the options given below.
1. \((\mathrm{B})\) and \((\mathrm{D})\) are True but \((\mathrm{A})\) and \((\mathrm{C})\) are False
2. \((\mathrm{A})\) and \((\mathrm{D})\) are True, but \((\mathrm{B})\) and \((\mathrm{C})\) are False
3. \((\mathrm{A})\) and \((\mathrm{C})\) are True, but \((\mathrm{B})\) and \((\mathrm{D})\) are False
4. \((\mathrm{B})\) and \((\mathrm{C})\) are True but \((\mathrm{A})\) and \((\mathrm{D})\) are False
| \((\mathrm{A})\) | The volume of a nucleus is proportional to \(A^{1/3}.\) |
| \((\mathrm{B})\) | The volume of a nucleus is proportional to \(A.\) |
| \((\mathrm{C})\) | The difference in mass of an atom and its nucleus is called the mass defect. |
| \((\mathrm{D})\) | The difference in mass of a nucleus and its constituents is called the mass defect. |
1. \((\mathrm{B})\) and \((\mathrm{D})\) are True but \((\mathrm{A})\) and \((\mathrm{C})\) are False
2. \((\mathrm{A})\) and \((\mathrm{D})\) are True, but \((\mathrm{B})\) and \((\mathrm{C})\) are False
3. \((\mathrm{A})\) and \((\mathrm{C})\) are True, but \((\mathrm{B})\) and \((\mathrm{D})\) are False
4. \((\mathrm{B})\) and \((\mathrm{C})\) are True but \((\mathrm{A})\) and \((\mathrm{D})\) are False
Subtopic: Mass-Energy Equivalent |
56%
Level 3: 35%-60%
NEET - 2026
Please attempt this question first.
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Please attempt this question first.
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