Q. No.A nucleus represented by the symbol 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
Solar energy is mainly caused due to:
| 1. | burning of hydrogen in the oxygen |
| 2. | fission of uranium present in the sun |
| 3. | fusion of protons during synthesis of heavier elements |
| 4. | gravitational contraction |
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about:
1. \(10\)
2. \(10^5\)
3. \(10^{10}\)
4. \(10^{15}\)
If in a nuclear fusion process. the masses of the fusing nuclei be \(m_1\) and \(m_2\) and the mass of the resultant nucleus be \(m_3,\) then:
| 1. | \( m_3=\left|m_1-m_2 \right|\) | 2. | \( m_3<\left ( m_1+m_2 \right ) \) |
| 3. | \( m_3>\left ( m_1+m_2 \right ) \) | 4. | \( m_3=\left ( m_1+m_2 \right ) \) |
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. \(119.0\)
1. \(a+b+c\)
2. \(c+a-b\)
3. \(c-a-b\)
4. \(a+b-c\)
As compared to 12C atom, 14C atom has:
| 1. | two extra protons and two extra electrons |
| 2. | two extra protons but no extra electron |
| 3. | two extra neutrons and no extra electron |
| 4. | two extra neutrons and two extra electrons |
Let \(F_{pp}, F_{pn}~\text{and}~F_{nn}\) denote the magnitudes of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is \(1~\text{fm}\),
| 1. | \(F_{pp}> F_{pn}=F_{nn}\) |
| 2. | \(F_{pp}= F_{pn}=F_{nn}\) |
| 3. | \(F_{pp}> F_{pn}>F_{nn}\) |
| 4. | \(F_{pp}< F_{pn}=F_{nn}\) |
Two protons are kept at a separation of \(10\) nm. Let \(F_n\) and \(F_e\) be the nuclear force and the electromagnetic force between them.
| 1. | \(F_e=F_n\) |
| 2. | \(F_e>>F_n\) |
| 3. | \(F_e<<F_n\) |
| 4. | \(F_e\) and \(F_n\) differ only slightly |
Which of the following is a wrong description of binding energy of a nucleus?
| 1. | it is the energy required to break a nucleus into its constituent nucleons. |
| 2. | it is the energy made available when free nucleons combine to form a nucleus. |
| 3. | it is the sum of the rest mass energies of its nucleons minus the rest mass energy of the nucleus. |
| 4. | it is the sum of the kinetic energy of all the nucleons in the nucleus. |
© 2024 GoodEd Technologies Pvt. Ltd.