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 Multiple Choice QuestionsMultiple Choice Questions

21.

If radius of  nucleus is estimated to be 3.6 Fermi then the radius nucleus

  • 6 fermi

  • 8 fermi

  • 4 fermi

  • 4 fermi

310 Views

22.

A nuclear transformation is denoted by X(n, α) . Which of the following is the nucleus of element X?

  • straight C presuperscript 12 subscript 6
  • straight B presubscript 5 presuperscript 10
  • straight B presubscript 5 presuperscript 9
  • straight B presubscript 5 presuperscript 9
542 Views

23.

Two spherical conductor B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion, between B and C is

  • F/4

  • 3F/4

  • 3F/8

  • 3F/8

199 Views

24.

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2:1. The ratio of their nuclear sizes will be

  • 21/3:1

  • 1:31/2

  • 31/2:1

  • 31/2:1

222 Views

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25.

The binding energy per nucleon of deuteron (21H) and helium nucleus (42He) is 1.1 MeV and 7 MeV respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

  • 13.9 MeV

  • 26.9 MeV

  • 23.6 MeV

  • 23.6 MeV

551 Views

26.

An α-particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of the closest approach is of the order of

  • 1 Å

  • 10−10 cm

  • 10−12 cm

  • 10−12 cm

1123 Views

27.

Which of the following particle when bombards on 65Cu will turn into 66Cu ?

  • Proton

  • Neutron

  • Electron

  • Alpha particle


28.

8 g of Cu66 undergoes radioactive decay and after 15 minutes only 1 g remains. The half-life, in minutes, is then

  • 15 ln (2) / ln(8)

  • 15 ln (8) / ln (2)

  • 15/8

  • 8/15


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29.

For a light nuclei, which of the following relation between the atomic number (Z) and mass number (A) is valid ?

  • A = Z/2

  • Z = A

  • Z = A/2

  • Z = A2


30.

During β emission,

  • a neutron in the nucleus decays emitting an electron

  • an atomic electron is ejected

  • an electron already present within the nucleus is ejected

  • a part of the binding energy of the nucleus is converted into an electron


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