A. | volume of the nucleus is directly proportional to the mass number. |
B. | volume of the nucleus is independent of mass number. |
C. | density of the nucleus is directly proportional to the mass number. |
D. | density of the nucleus is directly proportional to the cube root of the mass number. |
E. | density of the nucleus is independent of the mass number. |
1. | (A) and (D) only. |
2. | (A) and (E) only. |
3. | (B) and (E) only. |
4. | (A) and (C) only. |
1. | decrease continuously with mass number. |
2. | first decreases and then increases with an increase in mass number. |
3. | first increases and then decreases with an increase in mass number. |
4. | increases continuously with mass number. |
Assertion (A): | Isotopes of an element can be separated by using a mass spectrometer. |
Reason (R): | Separation of isotopes is possible because of the difference in electron numbers of isotopes. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | \(\beta^- -\) particles. | Radioactive nuclei emits
Reason (R): | Electrons exist inside the nucleus. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
The energy required in \(\mathrm{MeV} / \mathrm{c}^2\) to separate \({ }_8^{16} \mathrm{O}\) into its constituents is:
(Given mass defect for \({ }_8^{16} \mathrm{O}=0.13691 \mathrm{u}\))
1. \(127.5\)
2. \(120.0\)
3. \(222.0\)
4. \(119.0\)
A nuclear reaction is given by
represents:
1. β-decay
2. γ-decay
3. fusion
4. fission
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. |
The mass of a proton is 1.0073 u and that of a neutron is 1.0087 u (u = atomic mass unit). The binding energy of is: (Given: helium nucleus mass ≈ 4.0015 u)
1. | 0.0305 J | 2. | 0.0305 erg |
3. | 28.4 MeV | 4. | 0.061 u |
Which of the following rays are not electromagnetic waves?
1. X-rays
2. γ-rays
3. β-rays
4. Heat rays