51. __________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.
52. What is the average life of a radioactive atom having a 'half life period' of T?
53. Which of the following is a non-fissile material?
54. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
55. Indian monazite sand contains __________ percent thorium.
56. Which of the following nuclear materials is fissile?
57. 'Light water' used as a coolant in nuclear reactor is nothing but
58. The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are
59. The half life period of a radioactive element depends on its
60. First experimental observation of nuclear fission was done by
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