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19.

The main interest of shielding in nuclear reactor is protection against                        
A. X-rays B. infra-red rays
C. a, P, and y rays D. neutrons and gamma rays



20.

Reflector in nuclear plants is used to                        
A. return the neutrons back into the core B. shield the radioactivity completely
C. check polllution D. conserve energy



21.

The energy required to be applied to a radioactive nucleus for the emission of a neutron is                        
A. 1 MeV B. 2.4 MeV
C. 4.3 MeV D. 7.8 MeV




22.

Which of the following are ferrite materials                        
A. U233andPu239 B. U
C. U238andPu239 D. U238andTh239



23.

Ferrite material is                        
A. the most fissionable material B. the basic fuel for nuclear paints
C. basic raw material for nuclear plants D. the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material



24.

Enriched uranium is one in which                        
A. %age of U235 has been artificially in-creased B. %age of U has been artificially in¬creased
C. %age of U234 has been artificially in-creased D. extra energy is pumped from outside



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