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 |
| 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. |
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. | \(F_{pp}< F_{pn}=F_{nn}\) |
The gravitational force between H-atom and another particle of mass m will be given by Newton's law \(F=\frac{GMm}{r^2},\) where r is
in km and
| 1. | M=mproton+melectron. |
| 2. | M=mproton+melectron-\(\frac{B}{c^2}\) ( B=13.6 eV ). |
| 3. | M is not related to the mass of the hydrogen atom. |
| 4. | M=mproton+melectron-\(\frac{|V|}{c^2}\) ( |V| = magnitude of the potential energy of electron in the H-atom). |
\(E_1:\) total binding energy of initial nuclei
\(E_2:\) total binding energy of final nuclei
\(A_1:\) total number of nucleons of initial nuclei
\(A_2:\) total number of nucleons of final nuclei
Then:
1. \(E_1>E_2\)
2. \(E_2>E_1\)
3. \(E_1=E_2\)
4. \(\frac{E_1}{A_1}=\frac{E_2}{A_2}\)
The Binding energy per nucleon of \(^{7}_{3}\mathrm{Li}\) and \(^{4}_{2}\mathrm{He}\) nucleon are \(5.60~\text{MeV}\) and \(7.06~\text{MeV}\), respectively. In the nuclear reaction \(^{7}_{3}\mathrm{Li} + ^{1}_{1}\mathrm{H} \rightarrow ^{4}_{2}\mathrm{He} + ^{4}_{2}\mathrm{He} +Q\), the value of energy \(Q\) released is:
1. \(19.6~\text{MeV}\)
2. \(-2.4~\text{MeV}\)
3. \(8.4~\text{MeV}\)
4. \(17.3~\text{MeV}\)
The mass of a nucleus is \(0.042~\text{u}\) less than the sum of the masses of all its nucleons. The binding energy per nucleon of the nucleus is near:
1. \(4.6~\text{MeV}\)
2. \(5.6~\text{MeV}\)
3. \(3.9~\text{MeV}\)
4. \(23~\text{MeV}\)
The binding energy of deuteron is \(2.2~\text{MeV}\) and that of \(_2\mathrm{He}^{4}\) is \(28~\text{MeV}\). If two deuterons are fused to form one \(_{2}\mathrm{He}^{4}\), then the energy released is:
1. \(25.8~\text{MeV}\)
2. \(23.6~\text{MeV}\)
3. \(19.2~\text{MeV}\)
4. \(30.2~\text{MeV}\)
1. \(a+b+c\)
2. \(c+a-b\)
3. \(c-a-b\)
4. \(a+b-c\)
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. | \( m_3=\left ( m_1+m_2 \right ) \) |
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