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Q. No.\({ }_{82}^{290} X \xrightarrow{\alpha} Y \xrightarrow{e^{+}} Z \xrightarrow{\beta^{-}} P \xrightarrow{e^{-}} Q\)
In the nuclear emission stated above, the mass number and atomic number of the product \(Q\) respectively, are:
1. \(286,80\)
2. \(288,82\)
3. \(286,81\)
4. \(280,81\)
In the nuclear emission stated above, the mass number and atomic number of the product \(Q\) respectively, are:
1. \(286,80\)
2. \(288,82\)
3. \(286,81\)
4. \(280,81\)
Subtopic: Types of Decay |
60%
From NCERT
NEET - 2024
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The ratio of nuclear densities and nuclear volumes of \(^{56}_{26}\mathrm{Fe}\) and \(^{4}_{2}\mathrm{He}\) are, respectively:
1. \(13:1\) and \(14:1\)
2. \(14:1\) and \(1:1\)
3. \(1:1\) and \(14:1\)
4. \(1:1\) and \(13:1\)
1. \(13:1\) and \(14:1\)
2. \(14:1\) and \(1:1\)
3. \(1:1\) and \(14:1\)
4. \(1:1\) and \(13:1\)
Subtopic: Nucleus |
76%
From NCERT
NEET - 2024
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An excited heavy nucleus \(^A_Z \mathrm{X}\) emits radiations in the following sequence:
\(^A_Z \mathrm{X}\rightarrow ^{A-4}_{Z-2}\mathrm{D_1}\rightarrow ^{A-4}_{Z-1}\mathrm{D_2}\rightarrow ^{A-8}_{Z-3}\mathrm{D_3}\rightarrow ^{A-8}_{Z-4}\mathrm{D_4}\rightarrow ^{A-8}_{Z-4}\mathrm{D_5}\)
where \(Z,A\) are the atomic and mass number of element \(\mathrm{X},\) respectively. The possible emitted particles or radiations in the sequence, respectively are:
1. \(e^+, \alpha, e^-, \alpha , \gamma \)
2. \(e^-, \alpha, e^+, \alpha , \gamma \)
3. \(\alpha ,e^-, \alpha, e^+, \gamma \)
4. \(\alpha ,e^+, \alpha, e^-, \gamma \)
\(^A_Z \mathrm{X}\rightarrow ^{A-4}_{Z-2}\mathrm{D_1}\rightarrow ^{A-4}_{Z-1}\mathrm{D_2}\rightarrow ^{A-8}_{Z-3}\mathrm{D_3}\rightarrow ^{A-8}_{Z-4}\mathrm{D_4}\rightarrow ^{A-8}_{Z-4}\mathrm{D_5}\)
where \(Z,A\) are the atomic and mass number of element \(\mathrm{X},\) respectively. The possible emitted particles or radiations in the sequence, respectively are:
1. \(e^+, \alpha, e^-, \alpha , \gamma \)
2. \(e^-, \alpha, e^+, \alpha , \gamma \)
3. \(\alpha ,e^-, \alpha, e^+, \gamma \)
4. \(\alpha ,e^+, \alpha, e^-, \gamma \)
Subtopic: Types of Decay |
64%
From NCERT
NEET - 2024
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The half-life of a radioactive substance is \(20\) minutes. In how much time, the activity of substance drops to \((\frac{1}{16})^{\mathrm{th}}\) of its initial value?
1. \(80\) minutes
2. \(20\) minutes
3. \(40\) minutes
4. \(60\) minutes
1. \(80\) minutes
2. \(20\) minutes
3. \(40\) minutes
4. \(60\) minutes
Subtopic: Radioactivity (OLD NCERT) |
52%
From NCERT
NEET - 2023
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In the given nuclear reaction, the element \(\mathrm{X}\) is:\({ }_{11}^{22} \mathrm{Na} \rightarrow \mathrm{X}+\mathrm{e}^{+}+\nu\)
| 1. | \({ }_{12}^{22} \mathrm{Mg}\) | 2. | \({ }_{11}^{23} \mathrm{Na}\) |
| 3. | \({ }_{10}^{23} \mathrm{Ne}\) | 4. | \(_{10}^{22}\textrm{Ne}\) |
Subtopic: Types of Decay |
65%
From NCERT
NEET - 2022
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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. | \(5:4\) |
Subtopic: Nucleus |
81%
From NCERT
NEET - 2022
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At some instant, the number of radioactive atoms in a sample is \(N_0\) and after time \(t\), the number decreases to \(N\). It is found that the graphical representation \(\mathrm{ln} N\) versus \(t\) along the \(y\) and \(x\) axis respectively is a straight line. Then the slope of this line is:
1. \(\lambda\)
2. \(-\lambda\)
3. \(\lambda^{-1}\)
4. \(-\lambda^{-1}\)
Subtopic: Radioactivity (OLD NCERT) |
67%
From NCERT
NEET - 2022
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The fraction of the original number of radioactive atoms that disintegrates (decays) during the average lifetime of a radioactive substance will be:
1. \(\frac{1}{e}\)
2. \(\frac{1}{1+e}\)
3. \(\frac{e-1}{e+1}\)
4. \(\frac{e-1}{e}\)
Subtopic: Radioactivity (OLD NCERT) |
From NCERT
NEET - 2022
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement-I: | The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample. |
| Statement-II: | The half life of a radionuclide is the sum of the left time of all nuclei, divided by the initial concentration of the nuclei at time \(t=0.\) |
| 1. | Both Statement-I and Statement-II are correct. |
| 2. | Both Statement-I and Statement-II are incorrect. |
| 3. | Statement-I is correct but Statement-II is incorrect. |
| 4. | Statement-I is incorrect but Statement-II is correct. |
Subtopic: Radioactivity (OLD NCERT) |
55%
From NCERT
NEET - 2022
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At any instant, two elements X1 and X2 have the same number of radioactive atoms. If the decay constant of X1 and X2 are 10 \(\lambda\) and \(\lambda\) respectively, then the time when the ratio of their atoms becomes \(\frac1e\) will be:
1. \(\frac{1}{11\lambda}\)
2. \(\frac{1}{9\lambda}\)
3. \(\frac{1}{6\lambda}\)
4. \(\frac{1}{5\lambda}\)
1. \(\frac{1}{11\lambda}\)
2. \(\frac{1}{9\lambda}\)
3. \(\frac{1}{6\lambda}\)
4. \(\frac{1}{5\lambda}\)
Subtopic: Radioactivity (OLD NCERT) |
72%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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