Radioactive decay is
A.a physical change
B.a chemical change
C.a nuclear change
D.none of the above
Category: Nuclear Engineering Mcqs
Select the correct statement.
A.Ionising power of ?-rays is higher than that of ?-rays
B.Penetrating power of ?-rays is higher than that of ?-rays
C.?-rays are composed of positively charged particles of mass 2
D.?-rays travel faster than ?-rays
The half-life period t 1/2 of a radioactive element is N years. The period of its complete decay is
A.2N years
B.N2 years
C.N2 years
D.infinity
Unit of radioactivity is
A.Curie
B.Fermi
C.Angstron
D.Candle
The critical mass of a fissionable material can be reduced by
A.cooling the material
B.heating the material
C.surrounding it by neutron reflecting material
D.surrounding it by neutron absorbing material
The fertile fuels are those
A.which by nuclear reactions give fission fuels
B.which can be fissioned by thermal neutrons
C.which can be fissioned by fast neutrons
D.which cannot be converted into fission fuels
Fission is a process in which
A.nucleus is split into two fragments
B.two nuclei fuse together and fecrease in mass appears in the form of energy
C.atoms and molecules lose their identity
D.matter appears in the fourth state called plasma
The sum of masses of two nuclei produced in fission is
A.less than the mass of the original nucleus
B.more than the mass of the original nucleus
C.equal to the mass of the original nucleus
D.many times less than the mass of the original nucleus
Energy in the sun is produced as a result of
A.fission
B.thermonuclear reaction
C.explosion
D.combustion
