If M is the atomic mass and A is the mass number, packing fraction is given by
(a) $\frac{\mathrm{A}}{\mathrm{M}-\mathrm{A}}$            (b) $\frac{\mathrm{A}-\mathrm{M}}{\mathrm{A}}$
(c)$\frac{M}{\mathrm{M}-\mathrm{A}}$             (d) $\frac{\mathrm{M}-\mathrm{A}}{\mathrm{A}}$

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

${\mathrm{M}}_{\mathrm{p}}$ denotes the mass of a proton and ${\mathrm{M}}_{\mathrm{n}}$ that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by (c is the velocity of light)
(a) $\mathrm{M}\left(\mathrm{N},\mathrm{Z}\right)={\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}-{\mathrm{Bc}}^{2}$
(b) $\mathrm{M}\left(\mathrm{N},\mathrm{Z}\right)={\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}+{\mathrm{Bc}}^{2}$
(c) $\mathrm{M}\left(\mathrm{N},\mathrm{Z}\right)={\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}-\mathrm{B}/{\mathrm{c}}^{2}$
(d) $\mathrm{M}\left(\mathrm{N},\mathrm{Z}\right)={\mathrm{NM}}_{\mathrm{n}}+{\mathrm{ZM}}_{\mathrm{p}}+\mathrm{B}/{\mathrm{c}}^{2}$

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Complete the reaction
$\mathrm{n}+{}_{92}{}^{235}\mathrm{U}\to {}_{56}{}^{144}\mathrm{Ba}+...+3\mathrm{n}$
(a) ${}_{36}{}^{89}\mathrm{Kr}$       (b) ${}_{36}{}^{90}\mathrm{Kr}$
(c) ${}_{36}{}^{91}\mathrm{Kr}$       (d) ${}_{36}{}^{92}\mathrm{Kr}$

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

1 atomic mass unit is equal to
(a) $\frac{1}{25}$ (mass of ${\mathrm{F}}_{2}$ molecules)
(b) $\frac{1}{14}$ (mass of ${\mathrm{N}}_{2}$ molecules)
(c) $\frac{1}{12}$ (mass of one C-atom)
(d) $\frac{1}{16}$ (mass of ${\mathrm{O}}_{2}$ molecules)

Concept Questions :-

Mass-energy equivalent

Difficulty Level:

The nucleus ${}_{92}{}^{234}\mathrm{U}$ splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are

(a) ${}_{46}{}^{116}\mathrm{Pd}$         (b) ${}_{45}{}^{117}\mathrm{Rh}$
(c) ${}_{45}{}^{116}\mathrm{Rh}$       (d) ${}_{46}{}^{117}\mathrm{Pd}$

Concept Questions :-

Difficulty Level:

A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called

Concept Questions :-

Difficulty Level:

Which of the following cannot cause fission in a heavy nucleus
(a) $\mathrm{\alpha }$-particle          (b) Proton
(c) Deutron             (d) Laser rays

Concept Questions :-

Difficulty Level:

If the mass number of an atom is A = 40 and its electron configuration is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}$, the number of neutrons and protons in its nucleus will be
(a) 22, 18            (b) 18, 22
(c) 20, 20            (d) 18, 18

Concept Questions :-

Mass-energy equivalent
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following is most unstable
(a) Electrons           (b) Protons
(c) Neutrons           (d) $\mathrm{\alpha }$-particle

Concept Questions :-

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The nuclei of which one of the following pairs of nuclei are isotones
(a)            (b)
(c)              (d)

Concept Questions :-

Nuclear binding energy