A radioactive decay can form an isotope of the original nucleus w

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 Multiple Choice QuestionsMultiple Choice Questions

111.

A force between two protons is same as the force between proton and neutron. The nature of the force is

  • weak nuclear force

  • strong nuclear force

  • electrical force

  • gravitational force


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112.

A radioactive decay can form an isotope of the original nucleus with the emission of particles

  • one α and one β

  • one α and four β

  • four α and one β

  • one α and two β


D.

one α and two β

YZA  α  YZ - 2A - 4  β-  YZ + 1A - 4  β-  YZA - 4

∴ One α and two β-particles.


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113.

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

  • 25 min

  • 30 min

  • 10 min

  • 40 min


114.

A nucleus at rest splits into two nuclear parts having radii in the ratio 1 : 2. Their velocities are in the ratio

  • 4 : 1

  • 8 : 1

  • 2 : 1

  • 6 : 1


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115.

A radioactive sample of half-life 10 days contains 1000 x nuclei. Number of original nuclei present after 5 days is

  • 707 x

  • 750 x

  • 500 x

  • 250 x


116.

An element X decays into element Z by two-step process

                      X  Y + He24Y  Z + 2e-, then

  • X and Z are isobars

  • X and Y are isotopes

  • X and Z are isotones

  • X and Z are isotopes


117.

A nucleus of mass 20 u emits a γ-photon of energy 6 MeV. If the emission assume to occur when nucleus is free and rest, then the nucleus will have kinetic energy nearest to (Take, 1 u = 1.6 × 10-27 kg)

  • 10 keV

  • 1 keV

  • 0.1 keV

  • 100 keV


118.

The particle emitted in the decay of U92238 to U92238

  • 2 α and 2β

  • 1 α and 1 β

  • 1 α only

  • 1 α and 2 β


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119.

The mass defect of He24 is 0.03 u. The binding energy per nucleon of helium (in MeV) is

  • 6.9825

  • 27.93

  • 2.793

  • 69.825


120.

In a nuclear reactor, the function of the moderator is to decrease

  • number of neutrons

  • speed of neutrons

  • escape of neutrons

  • temperature of the reactor


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