121. 75% of a radioactive element decays in 6 hours. Its half life period is __________ hours.
122. The phenomenon of nuclear fission is opposite to that of
123. 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
124. Which of the following is not, a fertile material?
125. Which of the following may not need a control rod?
126. Pick out the wrong statement.
127. Thermal shield is used in high powered nuclear reactors to
128. Which of the following undergoes fission reaction easily?
129. H2 is a better coolant than CO2, due to its relatively
130. Out of the following, nucleus of __________ atom contains the largest number of neutrons.
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