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Fission of nuclei is possible because the binding energy per nucleon in them:
1.
increases with mass number at high mass numbers.
2.
decreases with mass number at high mass numbers.
3.
increases with mass number at low mass numbers.
4.
decreases with mass number at low mass numbers.
Subtopic: Nuclear Binding Energy |
61%
Level 2: 60%+
Hints
\({}_{10}^{22}\mathrm{Ne}\) nucleus after absorbing energy decays into two \(\alpha \text{-particle}\) and an unknown nucleus. The unknown nucleus is:
1. Nitrogen
2. Carbon
3. Boron
4. Oxygen
1. Nitrogen
2. Carbon
3. Boron
4. Oxygen
Subtopic: Types of Decay |
71%
Level 2: 60%+
Hints
An atomic nucleus \({}_{90}^{232}\mathrm{Th}\) emits several \(\alpha\) and \(\beta\) radiations and finally reduces to \({}_{82}^{208}\mathrm{Pb}.\) It must have emitted:
1. \(4\alpha~\text{and}~2\beta\)
2. \(6\alpha~\text{and}~4\beta\)
3. \(8\alpha~\text{and}~24\beta\)
4. \(4\alpha~\text{and}~16\beta\)
1. \(4\alpha~\text{and}~2\beta\)
2. \(6\alpha~\text{and}~4\beta\)
3. \(8\alpha~\text{and}~24\beta\)
4. \(4\alpha~\text{and}~16\beta\)
Subtopic: Types of Decay |
85%
Level 1: 80%+
Hints
During negative -decay:
| 1. | a neutron converts into proton. |
| 2. | a proton converts into neutron. |
| 3. | neutron to proton ratio increases. |
| 4. | None of these |
Subtopic: Types of Decay |
76%
Level 2: 60%+
Hints
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If an electron and a positron annihilate, then the energy released is:
1. \(3.2\times 10^{-13}~\text{J}\)
2. \(1.6\times 10^{-13}~\text{J}\)
3. \(4.8\times 10^{-13}~\text{J}\)
4. \(6.4\times 10^{-13}~\text{J}\)
1. \(3.2\times 10^{-13}~\text{J}\)
2. \(1.6\times 10^{-13}~\text{J}\)
3. \(4.8\times 10^{-13}~\text{J}\)
4. \(6.4\times 10^{-13}~\text{J}\)
Subtopic: Mass-Energy Equivalent |
64%
Level 2: 60%+
Hints
In nuclear reaction \({}_{2}^{4}\mathrm{He}+ {}_{Z}^{A}\mathrm{X}\rightarrow {}_{Z+2}^{A+3}\mathrm{X}+\mathrm{B},\) \(\mathrm {B}\) denotes:
| 1. | electron | 2. | positron |
| 3. | proton | 4. | neutron |
Subtopic: Types of Decay |
66%
Level 2: 60%+
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The mass of an -particle is:
| 1. | less than the sum of masses of two protons and two neutrons. |
| 2. | equal to the mass of four protons. |
| 3. | equal to the mass of four neutrons. |
| 4. | equal to the sum of masses of two protons and two neutrons. |
Subtopic: Nuclear Binding Energy |
57%
Level 3: 35%-60%
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Subtopic: Mass-Energy Equivalent |
Level 4: Below 35%
Hints
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. \(17.3~\text{MeV}\)
Subtopic: Nuclear Binding Energy |
68%
Level 2: 60%+
AIPMT - 2014
Hints
A nucleus \({ }_{{n}}^{{m}} \mathrm{X}\) emits one \(\alpha\text -\text{particle}\) and two \(\beta\text- \text{particle}\) The resulting nucleus is:
| 1. | \(^{m-}{}_n^6 \mathrm{Z} \) | 2. | \(^{m-}{}_{n}^{4} \mathrm{X} \) |
| 3. | \(^{m-4}_{n-2} \mathrm{Y}\) | 4. | \(^{m-6}_{n-4} \mathrm{Z} \) |
Subtopic: Types of Decay |
82%
Level 1: 80%+
AIPMT - 2011
Hints
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