Important Questions of Nuclei Physics | Zigya

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31.

The binding energy per nucleon of 16O is 7.97 MeV and that of 17O is 7.75 MeV. The energy in MeV required to remove a neutron from 17O is

  • 3.52 

  • 3.64

  • 4.23

  • 7.86


32.

If the ratio of the radius of a nucleus with 61 neutrons to that of helium nucleus is 3, then the atomic number of this nucleus is

  • 27

  • 47

  • 51

  • 61


33.

A radioactive sample contains 10-3 kg each of two nuclear species A and B with half-life 4 days and 8 days, respectively. The ratio of the amounts of A and B after period of 16 days is

  • 1 : 2

  • 4 : 1

  • 1 : 4

  • 2 : 1


34.

The binding energy per nucleon for deuteron (1H2) and helium (2He4) are 1.1 MeV and 7 .0 MeV, respectively. The energy released when two deuterons fuse to form a helium nucleus is

  • 36.2 MeV

  • 23.6 MeV

  • 47.2 MeV

  • 11.8 MeV


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35.

In a series of radioactive decays, if a nucleus of mass number 180 and atomic number 72 decays into another nucleus of mass number 172 and atomic number 69, then the number of α and β particles released respectively are

  • 2,3

  • 2,2

  • 2,1

  • 2,0


36.

The half-life of a radioactive substance is 20 min. The time  taken between 50 % decay and 87.5 % decay of the substance will be

  • 20 min

  • 30 min

  • 40 min

  • 25 min


37.

The ratio of the surface area of the nuclei 52Te125 to that of 13Al127 is 

  • 53

  • 12517

  • 14

  • 259


38.

On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively

  • 2.5 and 2 keV

  • 3 and 1 keV

  • 2.5 and 2 MeV

  • 2 and 2 keV


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39.

A radioactive material of half-life time of 69.3 days kept in a container. 23 rd of the substance remains undecayed after (given, ln 32 = 0.4)

  • 20 days

  • 25 days

  • 35 days

  • 40 days


40.

The ratio between the radii of nuclei with mass numbers 27 and 125 is

  • 5 : 3

  • 3 : 5

  • 27 : 125

  • 125 : 27


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