40 TOP NUCLEAR POWER Engineering Online Test – Multiple Choice Questions and Answers 1. The most commonly used nuclear fuel in boiling water reactor is natural uranium enriched uranium monazite sand plutonium 2. Which one is radioactive in nature ? Helium Tritium Deuterium Heavy hydrogen 3. Percentage of U-238 in natural uranium is around 0.015 0.71 29.71 99.29 4. Fuel for a nuclear reactor (thermal) is plutonium radium uranium none of these 5. A fast breeder reactor employs molten sodium as coolant as well as moderator water as coolant graphite as moderator U-235 as fuel 6. Graphite is used in nuclear reactor as insulation lining of the reactor retarder of neutron velocity fuel lubricant 7. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium Pu-239 U-233 U-238 U-235 8. Uranium ore is currently mined & concentrated at Jadugoda Alwaye Khetri Ghatsila 9. 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 3/4th of it will disintegrate in two months it will completely disintegrate in four months l/8th of it will remain intact at the end of four months it will completely disintegrate in two months 10. Main source of __________ is monazite sand uranium hafnium thorium polonium Loading … Question 1 of 10