The two false statements about nuclear fusion are:
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The fuel for nuclear fusion is often uranium. - This statement is false because the primary fuels for nuclear fusion are isotopes of hydrogen, such as deuterium and tritium, not uranium.
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Nuclear fusion is used to generate electricity at nuclear power plants. - This statement is also false because current nuclear power plants primarily use nuclear fission (the splitting of heavy atomic nuclei, such as uranium) to generate electricity, rather than nuclear fusion.
So, the correct answers are the first and fourth statements.