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Q. No.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 |
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\({}_{10}^{22}\mathrm{Ne}\) 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 |
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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 |
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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 |
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From a newly formed radioactive substance (Half-life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is:
1. 6 hours
2. 12 hours
3. 24 hours
4. 128 hours
Subtopic: Radioactivity (OLD NCERT) |
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The half-life of a radioactive substance is 20 minutes. The time between 20% and 80% decay will be:
1. 20 minutes
2. 40 minutes
3. 30 minutes
4. 25 minutes
Subtopic: Radioactivity (OLD NCERT) |
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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 |
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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
1. Electron
2. Positron
3. Proton
4. Neutron
Subtopic: Types of Decay |
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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 |
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Subtopic: Mass-Energy Equivalent |
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