Unit of radioactivity is
A.Curie
B.Fermi
C.Angstron
D.Candle
Category: Nuclear Engineering Mcqs
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
A radioactive element X decays to give two inert gases. The element X is
A.92U238
B.86Ra226
C.90Th234
D.none of these
The half-life period of a radioactive element depends on
A.pressure
B.temperature
C.amount of element present
D.none of these
In slowing down neutrons in a reactor protons are most effective because
A.the mass of a proton is almost equal to that of a neutron
B.the proton has a change+e
C.the proton is a constituent of all nuclei
D.none of the above
The substance used as neutron moderator in nuclear reactors is
A.ordinary water
B.heavy water
C.liquid hydrogen
D.liquid ammonia
