Radioactivity of an isotope is expressed in______________________?
Radioactivity of an isotope is expressed in______________________?
A. Barn
B. MeV
C. Curie
D. Ergs
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Heat is generated in a nuclear reactor (thermal) by_________________?
Heat is generated in a nuclear reactor (thermal) by_________________?A. Combustion of a nuclear fuel e.g. uranium
B. Fusion of atoms of uranium
C. Absorption of neutrons in uranium atoms
D. Fission of U-235 by neutronsModerating material used in a thermal-reactor should be a ____________________?
Moderating material used in a thermal-reactor should be a ____________________?A. Good absorber of neutrons
B. Solid substance
C. Poor absorber of neutrons
D. None of theseEnrichment of uranium is done to increase the concentration of ______________ in the natural uranium?
Enrichment of uranium is done to increase the concentration of ______________ in the natural uranium?A. U-238
B. U-233
C. U-235
D. Pu-239Which of the following is not a good moderating material ?
Which of the following is not a good moderating material ?A. Concrete
B. Boron
C. 18/8 stainless steel
D. All A., B. and C.The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?
The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?A. 1/2
B. 1/4
C. 1/8
D. 1/16The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?
The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?A. 1
B. 2
C. 3
D. 4