Important Questions of Nuclei Physics | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

This question contains Statement -1 and Statement-2. Of the four choices given after the statements,
Choose the one that best describes the two statements.
Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
and
Statement – II: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

  • Statement – 1is false, Statement – 2 is true.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

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12.

If M0 is the mass of an oxygen isotope 8O17 , Mp and MN are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is

  • (M08MP) C2

  • (M08MP9MN) C2

  • M0C2

  • M0C2

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13.

In gamma-ray emission from a nucleus

  • both the neutron number and the proton number change

  • there is no change in the proton number and the neutron number

  • only the neutron number changes

  • only the neutron number changes

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14.

The half-life period of a radio-active element X is same as the mean life-time of another radio-active element Y. Initially, they have the same number of atoms. Then

  • X will decay faster than Y

  • Y will decay faster than X

  • X and Y have same decay rate initially

  • X and Y have same decay rate initially

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15.

When 3Li7 nuclei are bombarded by protons, and the resultant nuclei are 4Be8 , the emitted particles will be

  • neutrons

  • alpha particles

  • beta particles

  • beta particles

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16.

The ‘rad’ is the correct unit used to report the measurement of

  • the rate of decay of radioactive source

  • the ability of a beam of gamma ray photons to produce ions in a target

  • the energy delivered by radiation to a target.

  • the energy delivered by radiation to a target.

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17.

If the binding energy per nucleon in Li presubscript 3 presuperscript 7and He presubscript 4 presuperscript 2 nuclei are 5.60 MeV and 7.06 MeV respectively, then in the reaction

straight p space plus space Li presubscript 3 presuperscript 7 space rightwards arrow with space on top space 2 space He presubscript 2 presuperscript 4
energy of proton must be

  • 39.2 MeV

  • 28.24 MeV

  • 17.28 MeV

  • 17.28 MeV

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18.

The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to l/8. The thickness of lead which will reduce the intensity to l/2 will be

  • 6 mm

  • 9 mm

  • 18 mm

  • 18 mm

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19.

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 /2 m away, the number of electrons emitted by photocathode would

  • decrease by a factor of 4

  • increase by a factor of 4

  • decrease by a factor of 2

  • decrease by a factor of 2

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20.

Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is

  • 10 minutes

  • 15 minutes

  • 5 minutes

  • 5 minutes

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