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. \(5:4\)

Subtopic:  Nucleus |
 81%
From NCERT
NEET - 2022
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In the given nuclear reaction, the element \(\mathrm{X}\) is:

\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
1. \({ }_{12}^{22} \mathrm{Mg}\)
2. \({ }_{11}^{23} \mathrm{Na}\)
3. \({ }_{10}^{23} \mathrm{Ne}\)
4. \(_{10}^{22}\textrm{Ne}\)
Subtopic:  Types of Decay |
 65%
From NCERT
NEET - 2022
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A radioactive nucleus \(_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}\) undergoes spontaneous decay in the sequence \(_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}\rightarrow \mathrm{B}_{\mathrm{Z-1}}\rightarrow \mathrm{C}_{\mathrm{Z-3}}\rightarrow \mathrm{D}_{\mathrm{Z-2}}\) where \(\mathrm{Z}\) is the atomic number of element \(\mathrm{X}\). The possible decay particles in the sequence are: 
1. \(\beta^{+}, ~\alpha, ~\beta^{-}\) 2. \(\beta^{-}, ~\alpha, ~\beta^{+}\)
3. \(\alpha, ~\beta^{-},~\beta^{+}\) 4. \(\alpha, ~\beta^{+},~\beta^{-}\)
Subtopic:  Types of Decay |
 70%
From NCERT
NEET - 2021
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A nucleus with mass number \(240\) breaks into fragments each of mass number \(120\). The binding energy per nucleon of unfragmented nuclei is \(7.6~\text{MeV}\) while that of fragments is \(8.5~\text{MeV}\). The total gain in the binding energy in the process is:
1. \(804~\text{MeV}\)
2. \(216~\text{MeV}\)
3. \(0.9~\text{MeV}\)
4. \(9.4~\text{MeV}\)

Subtopic:  Nuclear Binding Energy |
 63%
From NCERT
NEET - 2021
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If a Xab species emits firstly a positron, then two α and two β and at last one α is also emitted and finally convert into stable Ydc species, so the correct relation will be: 
1.  c = b – 12,  d = a – 5
2.  a = c – 8,   d = b – 1
3.  a = c – 6,   d = b – 0
4.  a = c – 4,   a = b – 2

Subtopic:  Types of Decay |
 77%
From NCERT
AIPMT - 2001
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A nuclear reaction is given by;
\({}_{Z}^{A}\mathrm{X}\rightarrow {}_{Z+1}^{A}\mathrm{Y}+{}_{-1}^{0}\mathrm{e}+\nu\)
represents:
1. \(\beta\text-\)decay
2. \(\gamma\text-\)decay
3. fusion
4. fission
Subtopic:  Types of Decay |
 90%
From NCERT
AIPMT - 2003
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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 |
 53%
From NCERT
AIPMT - 2003
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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 \({}_{2}^{4}\mathrm{He}\) is: (Given: helium nucleus mass ≈ \(4.0015\) u)
1. \(0.0305\) J 2. \(0.0305\) erg
3. \(28.4\) MeV 4. \(0.061\) u
Subtopic:  Nuclear Binding Energy |
 75%
From NCERT
AIPMT - 2003
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Which of the following rays are not electromagnetic waves?

1. X-rays

2. γ-rays

3. β-rays

4. Heat rays

Subtopic:  Types of Decay |
 57%
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:  Mass-Energy Equivalent |
 60%
From NCERT
AIPMT - 2003
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