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Q. No.In which of the following decays the atomic number decreases?
(a)
\(\alpha\text-\)decay
(b)
\(\beta^{+}\text-\)decay
(c)
\(\beta^{-}\text{-}\)decay
(d)
\(\gamma\text-\)decay
Choose the correct option:
1.
(a), (b)
2.
(b), (c)
3.
(c)
4.
(a), (d)
Subtopic: Types of Decay |
89%
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The mass number of a nucleus is equal to:
| 1. | the number of neutrons in the nucleus. |
| 2. | the number of protons in the nucleus. |
| 3. | the number of nucleons in the nucleus. |
| 4. | none of them. |
Subtopic: Nuclear Energy |
85%
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The strong nuclear force between two nucleons:
| 1. | is only attractive force. |
| 2. | is only repulsive force. |
| 3. | maybe attractive or repulsive in nature depending on the distance. |
| 4. | is a central force. |
Subtopic: Nuclear Binding Energy |
57%
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The nuclear radius of a \({ }_{3}^{8} \mathrm{L i}\) nucleus is \(2.2~\text{fm}\). The nuclear radius of \({ }_{30}^{64} \mathrm{Zn}\) is nearly:
1. \(4.4~\text{fm}\)
2. \(7~\text{fm}\)
3. \(22~\text{fm}\)
4. \(17.6~\text{fm}\)
1. \(4.4~\text{fm}\)
2. \(7~\text{fm}\)
3. \(22~\text{fm}\)
4. \(17.6~\text{fm}\)
Subtopic: Nucleus |
86%
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Which of the following graphs accurately represents the relationship between the internuclear distance and the force between nucleons?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Nuclear Binding Energy |
83%
From NCERT
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Which of the following need not be necessarily obeyed in a nuclear reaction?
| 1. | The conservation of charge |
| 2. | The conservation of mass |
| 3. | The conservation of mass energy |
| 4. | The conservation of momentum |
Subtopic: Nuclear Energy |
51%
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In the given nuclear reaction, the element \(\mathrm{X}\) is:
\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
| 1. | \({ }_{12}^{22} \mathrm{Mg}\) | 2. | \({ }_{11}^{23} \mathrm{Na}\) |
| 3. | \({ }_{10}^{23} \mathrm{Ne}\) | 4. | \(_{10}^{22}\textrm{Ne}\) |
Subtopic: Types of Decay |
68%
From NCERT
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A nucleus of mass number \(189\) splits into two nuclei having mass numbers \(125\) and \(64.\) The ratio of the radius of two daughter nuclei respectively is:
1. \(25:16\)
2. \(1:1\)
3. \(4:5\)
4. \(5:4\)
1. \(25:16\)
2. \(1:1\)
3. \(4:5\)
4. \(5:4\)
Subtopic: Nucleus |
83%
From NCERT
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Given below are two statements:
| Assertion (A): | In \(\alpha \text-\text{decay}\) atomic number of the daughter nucleus is reduced by \(2\) units from the parent nucleus. |
| Reason (R): | An \(\alpha \text-\text{particle}\) carries four units of mass. |
| 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: Types of Decay |
80%
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\(\alpha \text-\)particles, \(\beta \text-\)particles and \(\gamma \text-\)rays, each have an energy of \(10~\text{MeV}.\) The increasing order of penetrating powers of the radiations will be:
1. \(\beta>~\alpha>~\gamma\)
2. \(\alpha<~\beta<~\gamma\)
3. \(\gamma=\beta<~\alpha\)
4. \(\alpha<~\beta=\gamma\)
1. \(\beta>~\alpha>~\gamma\)
2. \(\alpha<~\beta<~\gamma\)
3. \(\gamma=\beta<~\alpha\)
4. \(\alpha<~\beta=\gamma\)
Subtopic: Types of Decay |
89%
From NCERT
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