____________ moderator is used in a fast breeder reactor?
____________ moderator is used in a fast breeder reactor?
A. Graphite
B. Heavy water
C. Beryllium
D. No
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75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?
75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?A. 3/4
B. 1/6
C. 3
D. 4A moderator _____________ the neutrons?
A moderator _____________ the neutrons?A. Slows down
B. Absorbs
C. Accelerates
D. ReflectsIn a homogeneous nuclear reactor, the _____________ are mixed together?
In a homogeneous nuclear reactor, the _____________ are mixed together?A. Fuel & coolant
B. Fuel & moderator
C. Coolant & moderator
D. None of theseAtoms with same number of neutrons, but different number of nucleons are called___________________?
Atoms with same number of neutrons, but different number of nucleons are called___________________?A. Isotones
B. Isobars
C. Isotopes
D. IsostereThe amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?A. 3.125
B. 6.25
C. 12.50
D. 25Gas cooling as compared to water cooling of nuclear reactors___________________?
Gas cooling as compared to water cooling of nuclear reactors___________________?A. Cannot attain a high temperature
B. Is more efficient as gas has a higher specific heat
C. Can produce only saturated steam for feeding to power turbine
D. None of these