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Q. No.When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom:
1.
do not change for any type of radioactivity
2.
change for \(\alpha\) and \(\beta\text-\)radioactivity but not for \(\gamma\text-\)radioactivity
3.
change for \(\alpha\text-\)radioactivity but not for others
4.
change for \(\beta\text-\)radioactivity but not for others
Subtopic: Â Types of Decay |
 75%
From NCERT
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Tritium is an isotope of hydrogen whose nucleus triton contains \(2\) neutrons and \(1\) proton. Free neutrons decay into\(p+e^{-1}+\nu^{-1}.\) If one of the neutrons in Triton decays, it would transform into \(\mathrm{He}^{3}\) nucleus. This does not happen. This is because:
| 1. | triton energy is less than that of a \(\mathrm{He}^{3}\) nucleus. |
| 2. | the electron created in the beta decay process cannot remain in the nucleus. |
| 3. | both the neutrons in Triton have to decay simultaneously resulting in a nucleus with \(3\) protons, which is not a \(\mathrm{He}^{3}\) nucleus. |
| 4. | free neutrons decay due to external perturbations which is absent in Triton nucleus. |
Subtopic: Â Types of Decay |
From NCERT
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The gravitational force between \(H\text-\)atom and another particle of mass \(m\) will be given by Newton's law \(F=\dfrac{GMm}{r^2},\) where \(r\) is in km and
| 1. | \(M = m_{\text{proton}}+ m_{\text{electron}}.\) |
| 2. | \(M = m_{\text{proton}}+ m_{\text{electron}}-\frac{B}{c^2}\left(B= 13.6~\text{eV}\right)\). |
| 3. | \(M\) is not related to the mass of the hydrogen atom. |
| 4. | \(M = m_{\text{proton}}+ m_{\text{electron}}-\frac{|V|}{c^2}(|V|=\) magnitude of the potential energy of electron in the \(H\text-\)atom). |
Subtopic: Â Nuclear Binding Energy |
 64%
From NCERT
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In the reaction \({ }_1^2 \mathrm{H}+{ }_1^3 \mathrm{H} \longrightarrow{ }_2^4 \mathrm{He}+{ }_0^1 n \) , if the binding energies of \({ }_1^2 \mathrm{H},~_1^3 \mathrm{H} ~\text{and}~_2^4\mathrm{H}\) He are respectively \(a,b\) and \(c\) (in MeV,) then the energy (in MeV) released in this reaction is:
1. \(a+b+c\)
2. \(c+a-b\)
3. \(c-a-b\)
4. \(a+b-c\)
1. \(a+b+c\)
2. \(c+a-b\)
3. \(c-a-b\)
4. \(a+b-c\)
Subtopic: Â Nuclear Binding Energy |
 75%
From NCERT
AIPMT - 2005
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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. | \( m_3=\left ( m_1+m_2 \right ) \) |
Subtopic: Â Nuclear Binding Energy |
 78%
From NCERT
AIPMT - 2004
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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: Â Nuclear Binding Energy |
 90%
From NCERT
AIPMT - 2004
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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 |
Subtopic: Â Nuclear Energy |
 74%
From NCERT
AIPMT - 2003
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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. \(10^{15}\)
Subtopic: Â Mass-Energy Equivalent |
 60%
From NCERT
AIPMT - 2003
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The energy required in \(\text{MeV/c}^2 \) to separate \({ }_8^{16} \mathrm{O}\) into its constituents is:
(Given: mass defect for \({ }_8^{16} \mathrm{O}=0.13691~ \text{amu}\))
| 1. | \(127.5\) | 2. | \(120.0\) |
| 3. | \(222.0\) | 4. | \(119.0\) |
Subtopic: Â Mass-Energy Equivalent |
 68%
From NCERT
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The energy equivalent of \(0.5\) g of a substance is:
1. \(4.5\times10^{13}\) J
2. \(1.5\times10^{13}\) J
3. \(0.5\times10^{13}\) J
4. \(4.5\times10^{16}\) J
Subtopic: Â Mass-Energy Equivalent |
 62%
From NCERT
NEET - 2020
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