# $${}_{8}^{19}\mathrm{O}\rightarrow {}_{9}^{19}\mathrm{F}+\mathrm{A}+\mathrm{B}$$ 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 $$\dfrac{8 A + 2}{A + 1}$$ 2 $$\dfrac{8 A - 2}{A + 1}$$ 3 $$\dfrac{8 A - 1}{A + 1}$$ 4 $$\dfrac{8 A}{A + 1}$$
Subtopic:  Nuclear Binding Energy |
56%
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The statement which is incorrect about nuclear force between two protons is?

 1 These are always attractive forces. 2 These are non-central forces. 3 These are charge independent. 4 These are short-range forces.

Subtopic:  Nuclear Energy |
59%
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The volume $$(V)$$ of a nucleus is related to its mass $$(M)$$ as:
1. $$V\propto M$$
2. $$V\propto \frac{1}{M}$$
3. $$V\propto M^3$$
4. $$V\propto \frac{1}{M^3}$$

Subtopic:  Nucleus |
77%
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If the density of gold nucleus is $$X$$, then the density of silver nucleus will be:
1. $$2X$$
2. $$\frac{X}{3}$$
3. $$4X$$
4. $$X$$

Subtopic:  Nucleus |
81%
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A nucleus with mass number $$220$$ initially at rest emits an $$\alpha\text-$$particle. If the $$Q$$ value of the reaction is $$5.5$$ MeV, then the kinetic energy of $$\alpha\text-$$particle is:
1. $$4.4$$ meV
2. $$5.4$$ MeV
3. $$5.6$$ MeV
4. $$6.5$$ MeV

Subtopic:  Nuclear Binding Energy |
70%
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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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The binding energies of the nuclei $$A$$ and $$B$$ are $$E_a$$ and $$E_b$$ respectively. If three atoms of the element $$B$$ fuse to give one atom of element $$A$$ and an energy $$Q$$ is released, then $$E_a, E_b$$ and $$Q$$ are related as:
1. $$E_a-3E_b= Q$$
2. $$3E_b-E_a= Q$$
3. $$E_a+ 3E_b=Q$$
4. $$E_b+ 3E_a=Q$$

Subtopic:  Nuclear Binding Energy |
67%
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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%
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