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Q. No.When a nucleus undergoes \(\beta\)-decay, the quantity that increases is:
1.
mass number
2.
proton number
3.
neutron number
4.
density of the nucleus
Subtopic: Â Types of Decay |
 73%
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The nuclear radius of a nucleus having \(N\) neutrons and \(P\) protons is proportional to:
1. \(N+P\)
2. \((N+P)^{1/3}\)
3. \((N+P)^{2/3}\)
4. \((N+P)^{-1/3}\)
1. \(N+P\)
2. \((N+P)^{1/3}\)
3. \((N+P)^{2/3}\)
4. \((N+P)^{-1/3}\)
Subtopic: Â Nucleus |
 86%
From NCERT
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In which of the following cases will the final nucleus be an isotope of the parent?
| 1. | \(1~\alpha\)-decay followed by \(1~\beta\)-decay |
| 2. | \(1~\beta\)-decay followed by \(2~\alpha\)-decays |
| 3. | \(1~\alpha\)-decay followed by \(2~\beta\)-decays |
| 4. | none of the above |
Subtopic: Â Types of Decay |
 77%
From NCERT
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In a nuclear reaction the following quantities is/are conserved:
| 1. | kinetic energy | 2. | mass |
| 3. | momentum | 4. | all the above |
Subtopic: Â Mass-Energy Equivalent |
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A nuclear reaction occurs where a nucleus \(X\) breaks up into two separated nuclei \(Y\) and \(Z\text:~~~~X\longrightarrow Y+Z\)
Let, the nuclear radii of \(X,Y,Z\) be \(r_{_X},r_{_Y},r_{_Z}.\) Then, which of the following, is (nearly) correct?
Let, the nuclear radii of \(X,Y,Z\) be \(r_{_X},r_{_Y},r_{_Z}.\) Then, which of the following, is (nearly) correct?
| 1. | \(r_{_X}=r_{_Y}+r_{_Z}\) | 2. | \(\Large\frac{1}{r_{_X}}=\frac{1}{r_{_Y}}+\frac{1}{r_{_Z}}\) |
| 3. | \(r_{_X}=|r_{_Y}-r_{_Z}|\) | 4. | \(r_{_X}^3=r^3_{_Y}+r^3_{_Z}\) |
Subtopic: Â Nucleus |
 68%
From NCERT
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In a nuclear reaction, which of the following, is not necessarily conserved?
1. Number of neutrons
2. Number of protons
3. Number of electrons
4. All of the above
1. Number of neutrons
2. Number of protons
3. Number of electrons
4. All of the above
Subtopic: Â Types of Decay |
 56%
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During which one of the following events do the atomic number and the mass number of the emitting nuclei, both change?
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-emission
4. neutron-emission
1. \(\alpha\)-decay
2. \(\beta\)-decay
3. \(\gamma\)-emission
4. neutron-emission
Subtopic: Â Types of Decay |
 83%
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Which, of the following particles, is least absorbed by matter (i.e., interacts least) as it passes through?
1. \(\alpha\)-rays
2. \(\beta\)-rays
3. \(\gamma\)-rays
4. neutrinos
1. \(\alpha\)-rays
2. \(\beta\)-rays
3. \(\gamma\)-rays
4. neutrinos
Subtopic: Â Types of Decay |
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Which, of the following nuclear reactions, is possible in nature?
| 1. | \(p\rightarrow n+e^+\) |
| 2. | \(n\rightarrow p+e^-\) |
| 3. | \(p\rightarrow n+e^++\nu_e\) |
| 4. | \(n\rightarrow p+e^-+\bar{\nu_e}\) |
Subtopic: Â Types of Decay |
 65%
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The nuclear radius of which of the following nuclei is approximately twice that of deuterium \((_1\mathrm{H}^2)\)?
| 1. | \(_2\mathrm{He}^4\) | 2. | \(_3\mathrm{Li}^8\) |
| 3. | \(_4\mathrm{Be}^8\) | 4. | \(_8\mathrm{O}^{16}\) |
Subtopic: Â Nucleus |
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