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Q. No.In a nuclear reaction (involving atomic nuclei only), the sum of kinetic energies of the product nuclei was found to be greater than that of the reactants. This means that:
1.
some nucleons are created
2.
some nucleons are destroyed
3.
energy is converted into mass
4.
mass is converted into energy
Subtopic: Â Mass-Energy Equivalent |
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When a nucleus undergoes \(\alpha\)-decay,
| 1. | the atomic number increases |
| 2. | the mass number decreases |
| 3. | the proton number increases |
| 4. | the neutron number increases |
Subtopic: Â Types of Decay |
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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 |
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Among radioactive radiation emitted by spontaneous disintegration, the most prevalent are \(\alpha,\beta\) and \(\gamma.\) Let their speeds in air be \(v_\alpha,v_\beta\) and \(v_\gamma,\) respectively. Then:
1. \(v_\alpha>v_\beta>v_\gamma\)
2. \(v_\gamma>v_\beta>v_\alpha\)
3. \(v_\gamma>v_\alpha>v_\beta\)
4. \(v_\beta>v_\alpha>v_\gamma\)
1. \(v_\alpha>v_\beta>v_\gamma\)
2. \(v_\gamma>v_\beta>v_\alpha\)
3. \(v_\gamma>v_\alpha>v_\beta\)
4. \(v_\beta>v_\alpha>v_\gamma\)
Subtopic: Â Types of Decay |
 73%
From NCERT
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The density \((d)\) of a nucleus varies according to the number of nucleons \((A)\) as:
| 1. | \(d\propto A\) | 2. | \(d\propto\)\(\large\frac{1}{A}\) |
| 3. | \(d\propto A^{1/3}\) | 4. | \(d=\text{constant}\) |
Subtopic: Â Nucleus |
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The nucleus of an atom has a radius which is of the order of:
1. \(10^{-9}~\text m\)
2. \(10^{-12}~\text m\)
3. \(10^{-15}~\text m\)
4. \(10^{-18}~\text m\)
1. \(10^{-9}~\text m\)
2. \(10^{-12}~\text m\)
3. \(10^{-15}~\text m\)
4. \(10^{-18}~\text m\)
Subtopic: Â Nucleus |
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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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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 |
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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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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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