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Which of the following phenomena may help in the making of more destructive weapon? 
(i) Nuclear fission   (ii)  Nuclear fusion.
Name the weapon. 


The principle of nuclear fusion is used for making destructive weapon.

Manufacturing of hydrogen bomb uses nuclear fusion.
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What moderator is used in a nuclear reactor? What makes compulsory the use of a moderator?

Indicate in symbols any three isotopes of uranium. Which among these is used for nuclear fission? What is meant by criticality of a nuclear reaction?

Write the principle of working of hydrogen bomb. How is hydrogen bomb accomplished?


Enumerate the factors that should be counted for choosing source of energy.

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