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91. The nuclear energy is measured as__________________?
A. MeV
B. curie
C. farads
D. MW
E. kWhr
92. Moderator in nuclear plants is used to__________________?
A. reduce temperature
B. extract heat from nuclear reaction
C. control the reaction
D. cause collision with the fast moving neutrons to reduce their speed
E. moderate the radioactive pollution
93. The most commonly used moderator in nuclear plants is___________________?
A. heavy water
B. concrete and bricks
C. graphite and concrete
D. deutrium
E. graphite
94. 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
E. electrons
95. Which of the following are ferrite materials__________________?
A. U233andPu239
B. U
C. U238andPu239
D. U238andTh239
E. none of the above
96. Enriched uranium is one in which__________________?
A. %age of U235 has been artificially in-creased
B. %age of U has been artificially increased
C. %age of U234 has been artificially in-creased
D. extra energy is pumped from outside
E. all impurities have been removed
97. Which of the following is the heaviest________________?
A. neutron
B. proton
C. atom
D. electron
E. nucleus
98. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?
A. same
B. lower
C. higher
D. unity
E. higher/lower depending on the size of reactor
99. A nuclear fission produces energy of following order in MeV___________________?
A. 20
B. 200
C. 2000
D. 20,000
E. 2 x 105
100. The process by which a heavy nucleus is splitted into two light nuclei is known as_________________?
A. splitting
B. fission
C. fusion
D. disintegration
E. chain reaction