What is the radius of iodine atom? (atomic no. 53, mass no. 126) 

(1)

(2)

(3)

(4)

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Which of the following statements is true for nuclear forces? 

(1) They obey the inverse square law of distance.

(2) They obey the inverse third power law of distance.

(3) They are short range forces.

(4) They are equal in strength to electromagnetic forces.

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The ratio of the radii of the nuclei ${}_{13}A{l}^{27}$ and ${}_{52}T{e}^{125}$ is approximately 

(1) 6 : 10               (2) 13 : 52              (3) 40 : 177                (4) 14 : 73

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Bragg's law for X-rays is

(1) d sin $\theta$= 2 n$\lambda$                          (2) 2d sin $\theta$= n$\lambda$

(3) n sin $\theta$= 2 $\lambda$d                          (4) None of these

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The relationship between disintegration constant $\left[\lambda \right]$ and half-life [T] will be:

(1)                     (2)

(3)                       (4)

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Alpha particles are

(1) 2 free protons

(2) helium atoms

(3) singly ionized helium atoms

(4) doubly ionised helium atoms

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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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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) ${F}_{pp}\ne {F}_{nn}\ne {F}_{pn}$

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

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Mass-energy equivalent