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Q. No.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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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 |
 60%
From NCERT
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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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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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During a \(\beta\)-decay, fast electrons are found to have been emitted. These electrons come from:
| 1. | the outermost atomic shell |
| 2. | the innermost atomic shell |
| 3. | the conduction band |
| 4. | the nucleus |
Subtopic: Â Types of Decay |
From NCERT
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If a nucleus is divided in the ratio of \(1:2^{1/3},\) what is the ratio of the velocities of the resulting parts?
| 1. | \(2\) | 2. | \(2^{1/3}\) |
| 3. | \(2^{2/3}\) | 4. | \(2^{(-1/3)}\) |
Subtopic: Â Nucleus |
 59%
From NCERT
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Given below are two statements:
| Assertion (A): | Binding energy per nucleon for nuclei (atomic number \(30\) to \(107\)) is independent of atomic number. |
| Reason (R): | Nuclear force is short-range force. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Nuclear Binding Energy |
From NCERT
JEE
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The average energy of a neutron produced in fission of \(^{235}_{92}\mathrm{U}\) in MeV is:
1. \(2\) MeV
2. \(3\) MeV
3. \(4\) MeV
4. \(6\) MeV
1. \(2\) MeV
2. \(3\) MeV
3. \(4\) MeV
4. \(6\) MeV
Subtopic: Â Nuclear Energy |
 58%
From NCERT
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Which one of the following statements is not true about nuclear forces?
| 1. | The nuclear force between two nuclei falls rapidly to zero as their distance increases more than a few femtometers (fm). |
| 2. | The nuclear force is much stronger than the coulomb force. |
| 3. | The nuclear force between two nuclei is repulsive for distances larger than \(0.8~\text{fm}.\) |
| 4. | The nuclear forces between neutron-neutron, proton-neutron, and proton-proton are approximately the same. |
Subtopic: Â Nuclear Binding Energy |
 55%
From NCERT
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Subtopic: Â Nucleus |
From NCERT
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