81. Enriched uranium is required as a fuel in a nuclear reactor. Light water is used as moderator & coolant, because light water has
82. What is the average life of a radioactive atom having a 'half life period' of T?
83. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
84. The radioactive isotope of hydrogen is
85. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about . . . . . . . . metres/second.
86. Pick out the wrong statement.
87. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a . . . . . . . . reactor.
88. An element having large number of . . . . . . . . is most easily subjected to nuclear fission.
89. A heterogeneous nuclear reactor is the one in which the moderator & the
90. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous uranium
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