# If the nuclear density of the material of atomic mass 27 is $$3\rho _{0},$$hen 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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${}_{8}{}^{19}\mathrm{O}$ $\to$ ${}_{9}{}^{19}\mathrm{F}$ $+$ $\mathrm{A}$ $+$ $\mathrm{B}$

In the given decay equation, A and 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$X$ 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.  $\frac{8A+2}{A+1}$

2.  $\frac{8A-2}{A+1}$

3.  $\frac{8A-1}{A+1}$

4.  $\frac{8A}{A+1}$

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 $\alpha$-particle. If the Q value of the reaction is 5.5 MeV, then the kinetic energy of $\alpha$-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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The binding energies of the nuclei A and B are Ea and Eb respectively. If three atoms of the element B fuse to give one atom of element A and an energy Q is released, then Ea, Eb and Q are related as:

1. Ea – 3Eb = Q

2. 3Eb – Ea = Q

3. Ea + 3Eb = Q

4. Eb + 3Ea = Q

Subtopic:  Nuclear Binding Energy |
67%
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Two nuclei fuse together to form a single nucleus as ${}_{1}{}^{2}\mathrm{A}+{}_{1}{}^{2}\mathrm{A}\to$ ${}_{2}{}^{4}\mathrm{B}$. 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 |
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