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:  Nuclear Energy |
 81%
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:  Nuclear Binding Energy |
 85%
From NCERT
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Two nuclei fuse together to form a single nucleus as \({}_{1}^{2}\mathrm{A}+ {}_{1}^{2}\mathrm{A}\rightarrow{}_{2}^{4}\mathrm{B}\) If binding energy per nucleon of \(A\) and \(B\) are respectively \(x\) and \(y\), then the energy released in the process is:
1. \(4x+4y\) 2. \(4x-4y\)
3. \(4y-4x\) 4. \(y-x\)
Subtopic:  Nuclear Binding Energy |
 71%
From NCERT
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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:  Types of Decay |
 64%
From NCERT
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released?

1. \(1.5 \times10^{-10}~\text{J}\) 2. \(3 \times10^{-10}~\text{J}\)
3. \(4.5 \times10^{-10}~\text{J}\) 4. None of these
Subtopic:  Mass-Energy Equivalent |
 54%
From NCERT
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What is the respective number of \(\alpha\) and \(\beta\text-\) particles emitted in the following radioactive decay?
\({}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}\)
1. \(6\) and \(8\) 2. \(6\) and \(6\)
3. \(8\) and \(8\) 4. \(8\) and \(6\)   
Subtopic:  Types of Decay |
 84%
From NCERT
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If the nuclear density of the material of atomic mass \(27\) is \(3\rho _{0},\) then the nuclear density of the material of atomic mass \(125\) is:
1. \(5\rho_0\)
2. \(3\rho_0\)
3. \(\frac{5}{3}\rho_0\)
4. \(\rho_0\)

Subtopic:  Nucleus |
 69%
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\({}_{8}^{19}\mathrm{O}\rightarrow {}_{9}^{19}\mathrm{F}+\mathrm{A}+\mathrm{B}\)
In the given decay equation, \(\mathrm{A}\) and \(\mathrm{B}\) indicate:
1. Electron and antineutrino
2. Positron and antineutrino
3. Positron and neutrino
4. Electron and positron
Subtopic:  Types of Decay |
 66%
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After two alpha decays and four beta(-ve) decays, the atomic number:
1. Decreases by \(4\) and mass number remains same.
2. Remains the same but the mass number increases by \(4\).
3. Remains the same but mass number decreases by \(8\).
4. Increases but mass number remains same.

Subtopic:  Types of Decay |
 84%
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Binding energy per nucleon of a fixed nucleus \({}^{A}\mathrm{X}\) is \(8\) MeV. It absorbs a neutron moving with kinetic energy \(4\) MeV and converts into \(Y\) emitting a photon of energy \(2\) MeV. The binding energy per nucleon of \(Y\) (in MeV) is:
1. \(\frac{8 A + 2}{A + 1}\)
2. \(\frac{8 A - 2}{A + 1}\)
3. \(\frac{8 A - 1}{A + 1}\)
4. \(\frac{8 A}{A + 1}\)
Subtopic:  Nuclear Binding Energy |
 56%
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