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Q. No.If in nuclear reactor using \(\mathrm{U}^{235}\) as fuel, the power output is \(4.8\) MW, the number of fissions per second is:
(Energy released per fission of \(\mathrm{U}^{235}=200\) MeV watts, \(1~\text{eV}= 1.6\times 10^{-19}~\text{J})\)
1.
\(1.5\times 10^{17}\)
2.
\(3\times 10^{19}\)
3.
\(1.5\times 10^{25}\)
4.
\(3\times 10^{25}\)
Subtopic: Â Nuclear Energy |
 73%
From NCERT
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The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:
| 1. | isobar of a parent. | 2. | isomer of a parent. |
| 3. | isotone of a parent. | 4. | isotope of a parent. |
Subtopic: Â Types of Decay |
 67%
From NCERT
AIPMT - 2009
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The Binding energy per nucleon of \(^{7}_{3}\mathrm{Li}\) and \(^{4}_{2}\mathrm{He}\) nucleon are \(5.60~\text{MeV}\) and \(7.06~\text{MeV}\), respectively. In the nuclear reaction \(^{7}_{3}\mathrm{Li} + ^{1}_{1}\mathrm{H} \rightarrow ^{4}_{2}\mathrm{He} + ^{4}_{2}\mathrm{He} +Q\), the value of energy \(Q\) released is:
1. \(19.6~\text{MeV}\)
2. \(-2.4~\text{MeV}\)
3. \(8.4~\text{MeV}\)
4. \(17.3~\text{MeV}\)
Subtopic: Â Nuclear Binding Energy |
 68%
From NCERT
AIPMT - 2014
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The nucleus \({ }_{6}^{12} \mathrm{C}\) absorbs an energetic neutron and emits \(\beta\text-\)particle. The resulting nucleus is:
| 1. | \({ }_{7}^{14} \mathrm{N}\) | 2. | \({ }_{5}^{13} \mathrm{B}\) |
| 3. | \({ }_{7}^{13} \mathrm{N}\) | 4. | \({ }_{6}^{13} \mathrm{C}\) |
Subtopic: Â Types of Decay |
 65%
From NCERT
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Fusion reaction takes place at a higher temperature because:
| 1. | atoms get ionized at high temperatures. |
| 2. | kinetic energy is high enough to overcome the Coulomb repulsion between nuclei. |
| 3. | molecules break up at a high temperature. |
| 4. | nuclei break up at a high temperature. |
Subtopic: Â Nuclear Energy |
 82%
From NCERT
NEET - 2011
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Which of the following pairs of nuclei are isotones?
| 1. | \({}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}\) | 2. | \({}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}\) |
| 3. | \({}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}\) | 4. | \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\) |
Subtopic: Â Nuclear Binding Energy |
 86%
From NCERT
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An atomic nucleus \({}_{90}^{232}\mathrm{Th}\) emits several \(\alpha\) and \(\beta\) radiations and finally reduces to \({}_{82}^{208}\mathrm{Pb}.\) It must have emitted:
1. \(4\alpha~\text{and}~2\beta\)
2. \(6\alpha~\text{and}~4\beta\)
3. \(8\alpha~\text{and}~24\beta\)
4. \(4\alpha~\text{and}~16\beta\)
1. \(4\alpha~\text{and}~2\beta\)
2. \(6\alpha~\text{and}~4\beta\)
3. \(8\alpha~\text{and}~24\beta\)
4. \(4\alpha~\text{and}~16\beta\)
Subtopic: Â Types of Decay |
 85%
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If an electron and a positron annihilate, then the energy released is:
1. \(3.2\times 10^{-13}~\text{J}\)
2. \(1.6\times 10^{-13}~\text{J}\)
3. \(4.8\times 10^{-13}~\text{J}\)
4. \(6.4\times 10^{-13}~\text{J}\)
1. \(3.2\times 10^{-13}~\text{J}\)
2. \(1.6\times 10^{-13}~\text{J}\)
3. \(4.8\times 10^{-13}~\text{J}\)
4. \(6.4\times 10^{-13}~\text{J}\)
Subtopic: Â Mass-Energy Equivalent |
 64%
From NCERT
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In nuclear reaction \({}_{2}^{4}\mathrm{He}+ {}_{Z}^{A}\mathrm{X}\rightarrow {}_{Z+2}^{A+3}\mathrm{X}+\mathrm{B},\) \(\mathrm {B}\) denotes:
| 1. | electron | 2. | positron |
| 3. | proton | 4. | neutron |
Subtopic: Â Types of Decay |
 66%
From NCERT
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After two alpha decays and four beta(-ve) decays, the atomic number:
| 1. | decreases by \(4\) and the mass number remains the same. |
| 2. | remains the same but the mass number increases by \(4.\) |
| 3. | remains the same but the mass number decreases by \(8.\) |
| 4. | increases but the mass number remains the same. |
Subtopic: Â Types of Decay |
 85%
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