1.Which statement is true about nuclear fission or bombs?
A moderator slows down neutrons to make fission less likely.
The nuclear bomb dropped on Hiroshima in WWII was called FatMan.  
A moderator slows down neutrons to make fission more likely.
The nuclear bomb in WWII that used ²³⁵U and a gun-typedesign was called Fat Man.
The maximum amount of fissile material that will sustain a chainreaction is called the critical mass.

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The correct ranking of countries from highest to lowest foreither their total nuclear power generation or for their percentageof electrical power from nuclear is:
Total nuclear power generation: France, U.S., China, SouthKorea
Percentage of electrical power from nuclear : South Korea, U.S.,France, China
Total nuclear power generation: France, South Korea, U.S.,China
Percentage of electrical power from nuclear : U.S., South Korea,France, China
Total nuclear power generation: U.S., France, China, SouthKorea

Which statement is true about a nuclear reactor?
Adding the moderator to the reactor slows down fission.
A sudden loss of primary coolant water in a pressurized waterreactor slows down fission.  
Removing the control rods from the reactor slows downfission.
Removing the moderator from the reactor speeds up fission.
A sudden loss of primary coolant water in a pressurized waterreactor speeds up fission.