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