${\mathrm{M}}_{\mathrm{n}}$ and ${\mathrm{M}}_{\mathrm{P}}$ represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be

(a) $\mathrm{M}<\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$          (b) $\mathrm{M}>\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$
(c) $\mathrm{M}=\left[{\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}\right]$          (d) $\mathrm{M}=\mathrm{N}\left[{\mathrm{M}}_{\mathrm{n}}+{\mathrm{M}}_{\mathrm{p}}\right]$

Concept Questions :-

Mass-energy equivalent
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Difficulty Level:

If a ${\mathrm{H}}_{2}$ nucleus is completely converted into energy, the energy produced will be around

(a) 1 MeV                (b) 938 MeV
(c) 9.38 MeV           (d) 238 MeV

Concept Questions :-

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Difficulty Level:

The radius of a nucleus of a mass number A is directly proportional to

(a)${\mathrm{A}}^{3}$              (b) A
(c) ${\mathrm{A}}^{2/3}$          (d) ${\mathrm{A}}^{1/3}$

Concept Questions :-

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Difficulty Level:

As compared ${}_{12}\mathrm{C}$ atom, ${}_{14}\mathrm{C}$ atom has

(a) Two extra protons and two extra electrons
(b) Two extra protons but no extra electrons
(c) Two extra neutrons and no extra electrons
(d) Two extra neutrons and two extra electrons

Concept Questions :-

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Difficulty Level:

If m, ${\mathrm{m}}_{\mathrm{n}}$ and ${\mathrm{m}}_{\mathrm{p}}$ are the masses of ${}_{\mathrm{Z}}\mathrm{X}_{\mathrm{A}}$ nucleus, neutron and proton respectively
(a) $\mathrm{m}<\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$        (b) $\mathrm{m}=\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$
(c) $\mathrm{m}=\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{p}+{\mathrm{Zm}}_{\mathrm{n}}$        (d) $\mathrm{m}>\left(\mathrm{A}-\mathrm{Z}\right){\mathrm{m}}_{\mathrm{n}}+{\mathrm{Zm}}_{\mathrm{p}}$

Concept Questions :-

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Difficulty Level:

On the bombardment of neutron with Boron. $\mathrm{\alpha }$-particle is emitted and product nuclei formed is
(a) ${}_{6}\mathrm{C}_{{}_{12}}$          (b) ${}_{3}\mathrm{Li}_{6}$
(c) ${}_{3}\mathrm{Li}_{7}$           (d) ${}_{4}\mathrm{Be}_{9}$

Concept Questions :-

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Difficulty Level:

The average kinetic energy of the thermal neutrons is of the order of
(a) 0.03 eV         (b) 3 eV
(c) 3 KeV            (d) 3 MeV

Concept Questions :-

Mass-energy equivalent

Difficulty Level:

Which of the following isotopes is normally fissionable ?

(a) ${}_{92}\mathrm{U}_{238}$              (b) ${}_{93}\mathrm{Np}_{239}$
(c) ${}_{92}\mathrm{U}_{235}$              (d) ${}_{2}\mathrm{He}_{4}$

Concept Questions :-

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Difficulty Level:

The process by which a heavy nucleus splits into light nuclei is known as
(a) Fission            (b) $\mathrm{\alpha }$-decay
(c) Fusion             (d) Chain reaction

Concept Questions :-

Mass-energy equivalent

Difficulty Level:

The explosion of the atomic bomb takes place due to

(a) Nuclear fission           (b) Nuclear fusion
(c) Scattering                 (d) Thermionic emission

Concept Questions :-

Mass-energy equivalent