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

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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

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

Difficulty Level:

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) $C{a}^{40}$

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Mass-energy equivalent
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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
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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)

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Nuclear binding energy
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In one $\alpha$ and 2 $\beta -emissions$ 

(1) mass number reduced by 2

(2) mass number reduces by 6

(3) atomic number reduces by 2

(4) atomic number remains unchanged

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Types of decay
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Which of the following is used as a moderator in nuclear reactors?

(1) Plutonium        (2) Cadmium          (3) Heavy water         (4) Uranium

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Nuclear reactor
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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

(1) to control energy released in the reactor

(2) to absorb neutrons and stop the chain reaction

(3) to cool the reactor

(4) to slow down the neutrons to thermal energies

Concept Questions :-

Nuclear reactor