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Q. No.When \({}_{3}^{7}\mathrm{Li}\) nuclei are bombarded by protons, and the resultant nuclei are \({}_{4}^{8}\mathrm{Be}\) the emitted particles will be:
1.
Neutrons
2.
Alpha particles
3.
Beta particles
4.
Gamma photons
Subtopic: Types of Decay |
52%
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Consider the following statements:
| (I) | All isotopes of elements have the same number of neutrons. |
| (II) | Only one isotope of an element can be stable and non-radioactive. |
| (III) | All elements have isotopes. |
| (IV) | All isotopes of carbon can form chemical compounds with oxygen\(\text-16\). |
The correct option regarding an isotope is:
| 1. | (III) and (IV) only |
| 2. | (II), (III), and (IV) only |
| 3. | (I), (II), and (III) only |
| 4. | (I), (III), and (IV) only |
Subtopic: Nucleus |
60%
From NCERT
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What is the respective number of \(\alpha\) and \(\beta\text-\) particles emitted in the following radioactive decay?
\({}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}\)
\({}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}\)
| 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 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%
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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. \({ }_{6}^{13} \mathrm{C}\)
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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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
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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. \({}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}\)
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%
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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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Determine the energy released in the process:
\({}_{1}^{2}\mathrm{H}+ {}_{1}^{2}\mathrm{H}\rightarrow {}_{2}^{4}\mathrm{He}+Q\)
Given: \(M\left({}_{1}^{2}\mathrm{H}\right)= 2.01471~\text{amu}, M\left({}_{2}^{4}\mathrm{He}\right)= 4.00388~\text{amu}\)
1. \(3.79\) MeV
2. \(13.79\) MeV
3. \(0.79\) MeV
4. \(23.79\) MeV
\({}_{1}^{2}\mathrm{H}+ {}_{1}^{2}\mathrm{H}\rightarrow {}_{2}^{4}\mathrm{He}+Q\)
Given: \(M\left({}_{1}^{2}\mathrm{H}\right)= 2.01471~\text{amu}, M\left({}_{2}^{4}\mathrm{He}\right)= 4.00388~\text{amu}\)
1. \(3.79\) MeV
2. \(13.79\) MeV
3. \(0.79\) MeV
4. \(23.79\) MeV
Subtopic: Mass-Energy Equivalent |
70%
From NCERT
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If \(\frac{N}{Z}\) ratio in a nucleus is smaller than the required value for stability, then:
| 1. | It may emit \(\alpha\text-\)particle. |
| 2. | It may emit \(\beta^{+}\) particle. |
| 3. | It may go for \(K\) capture. |
| 4. | All of the above are possible. |
Subtopic: Types of Decay |
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