Alpha particles are

(1) 2 free protons

(2) helium atoms

(3) singly ionized helium atoms

(4) doubly ionised helium atoms

Concept Questions :-

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

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A radioactive sample with a half-life of 1 month has the label: 'Activity = 2 microcurie on 1-8-1991'. What would be its activity two months earlier?

(1) 1.0 microcurie

(2) 0.5 microcurie

(3) 4 microcurie

(4) 8 microcurie

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High Yielding Test Series + Question Bank - NEET 2020

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If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by  respectively, then 

(1) ${F}_{pp}\approx {F}_{nn}\approx {F}_{pn}$

(2)

(3) ${F}_{pp}={F}_{nn}={F}_{pn}$

(4) ${F}_{pp}\ne {F}_{nn}\ne {F}_{pn}$

Concept Questions :-

Nuclear binding energy
High Yielding Test Series + Question Bank - NEET 2020

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A radioactive element has half-life period 800 yr. After 6400 yr, what fraction will remain? 

(1) $\frac{1}{2}$              (2) $\frac{1}{16}$            (3) $\frac{1}{8}$              (4) $\frac{1}{256}$

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If radius of the ${}_{12}{}^{27}Al$ nucleus is taken to be ${R}_{Al}$, then the radius of ${}_{53}{}^{125}Te$ nucleus is nearly

(1) $\frac{5}{3}{R}_{Al}$                  (2) $\frac{3}{5}{R}_{Al}$              (3) ${\left(\frac{13}{53}\right)}^{1/3}{R}_{Al}$            (4) ${\left(\frac{53}{13}\right)}^{1/3}{R}_{Al}$

Concept Questions :-

Mass-energy equivalent
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In a given reaction,

${}_{Z}X^{A}\to {}_{Z+1}Y^{A}\to {}_{Z-1}K^{A-4}\to {}_{Z-1}K^{A-4}$

(1)         (2)              (3)             (4)

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If a proton and anti-proton come close to each other and annihilate, how much energy will be released:

(1)

(2)

(3)

(4) None of these

Concept Questions :-

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

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The stable nucleus that  has a radius half that of $F{e}^{56}$ is

(1) $L{i}^{7}$         (2) $N{a}^{21}$          (3) ${S}^{16}$          (4) $C{a}^{40}$

Concept Questions :-

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

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The mass density of a nucleus varies with mass number A as 

(1) ${A}^{2}$               (2) A              (3) Constant         (4) $\frac{1}{A}$

Concept Questions :-

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

Difficulty Level:

Energy released in the fission of a single ${}_{92}U_{235}$ nucleus is 200 MeV. The fission rate of a ${}_{92}U_{235}$ filled reactor operating at a power level of 5 W is

(1)                    (2)

(3)                    (4)

Concept Questions :-

Nuclear binding energy