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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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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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 |
 70%
From NCERT
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A radioactive sample has a half-life of 1770 years. At some instant, 20% of the sample has decayed. If taking this instant as t = t1, it is found that at t = t2, 20% of the sample is left, then t2 - t1 is:

1.  1770 years

2.  885 years

3.  2655 years

4.  3540 years 

Subtopic:  Radioactivity (OLD NCERT) |
 68%
From NCERT
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If the half-life of a radioactive substance is 10 hours, then its mean life is:

1.  14.4 h

2.  7.2 h

3.  20 h

4.  6.93 h

Subtopic:  Radioactivity (OLD NCERT) |
 75%
From NCERT
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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%
From NCERT
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